Exhibit 10.1

GOLDMAN SACHS & CO. LLC | 200 WEST STREET | NEW YORK, NEW YORK 10282-2198 | TEL: 212-902-1000

Opening Transaction

This master confirmation (this “Master Confirmation”), dated as of December 13, 2021 is intended to set forth certain terms and provisions of certain Transactions (each, a “Transaction”) entered into from time to time between Goldman Sachs & Co. LLC (“GS&Co.”) and Ciena Corporation (“Counterparty”). This Master Confirmation, taken alone, is neither a commitment by either party to enter into any Transaction nor evidence of a Transaction. The additional terms of any particular Transaction shall be set forth in a Supplemental Confirmation in the form of Schedule A hereto (a “Supplemental Confirmation”), which shall reference this Master Confirmation and supplement, form a part of, and be subject to this Master Confirmation. This Master Confirmation and each Supplemental Confirmation together shall constitute a “Confirmation” as referred to in the Agreement specified below.

The definitions and provisions contained in the 2002 ISDA Equity Derivatives Definitions (the “Equity Definitions”), as published by the International Swaps and Derivatives Association, Inc., are incorporated into this Master Confirmation. This Master Confirmation and each Supplemental Confirmation evidence a complete binding agreement between Counterparty and GS&Co. as to the subject matter and terms of each Transaction to which this Master Confirmation and such Supplemental Confirmation relate and shall supersede all prior or contemporaneous written or oral communications with respect thereto.

This Master Confirmation and each Supplemental Confirmation supplement, form a part of, and are subject to an agreement in the form of the 1992 ISDA Master Agreement (Multicurrency-Cross Border) (the “Agreement”) as if GS&Co. and Counterparty had executed the Agreement on the date of this Master Confirmation (but without any Schedule except for (i) the election of Loss and Second Method, New York law (without reference to its choice of laws doctrine other than Title 14 of Article 5 of the New York General Obligations Law) as the governing law and US Dollars (“USD”) as the Termination Currency, (ii) the election that subparagraph (ii) of Section 2(c) will not apply to the Transactions, (iii) the replacement of the word “third” in the last line of Section 5(a)(i) with the word “first” and (iv) the election that the “Cross Default” provisions of Section 5(a)(vi) shall apply to Counterparty, with (a) a “Threshold Amount” of USD 50 million, (b) the deletion of the words “, or becoming capable at such time of being declared,” from clause (1) of such Section 5(a)(vi) and (c) the following language added to the end of such Section 5(a)(vi): “Notwithstanding the foregoing, a default under subsection (2) hereof shall not constitute an Event of Default if (x) the default was caused solely by error or omission of an administrative or operational nature; (y) funds were available to enable the party to make the payment when due; and (z) the payment is made within two Local Business Days of such party’s receipt of written notice of its failure to pay.”).

The Transactions shall be the sole Transactions under the Agreement. If there exists any ISDA Master Agreement between GS&Co. and Counterparty or any confirmation or other agreement between GS&Co. and

Counterparty pursuant to which an ISDA Master Agreement is deemed to exist between GS&Co. and Counterparty, then notwithstanding anything to the contrary in such ISDA Master Agreement, such confirmation or agreement or any other agreement to which GS&Co. and Counterparty are parties, the Transactions shall not be considered Transactions under, or otherwise governed by, such existing or deemed ISDA Master Agreement.

All provisions contained or incorporated by reference in the Agreement shall govern this Master Confirmation and each Supplemental Confirmation except as expressly modified herein or in the related Supplemental Confirmation.

If, in relation to any Transaction to which this Master Confirmation and a Supplemental Confirmation relate, there is any inconsistency between the Agreement, this Master Confirmation, any Supplemental Confirmation and the Equity Definitions, the following will prevail for purposes of such Transaction in the order of precedence indicated: (i) such Supplemental Confirmation; (ii) this Master Confirmation; (iii) the Equity Definitions; and (iv) the Agreement.

1.    Each Transaction constitutes a Share Forward Transaction for the purposes of the Equity Definitions. Set forth below are the terms and conditions that, together with the terms and conditions set forth in the Supplemental Confirmation relating to any Transaction, shall govern such Transaction.

General Terms:

2

3

4

Extraordinary Events:

5

6

7

2.    Calculation Agent.    GS&Co.; provided that following the occurrence and during the continuance of an Event of Default of the type described in Section 5(a)(vii) of the Agreement with respect to which GS&Co. is the sole Defaulting Party, Counterparty shall have the right to designate a nationally recognized third-party dealer in over-the-counter corporate equity derivatives to act, during the period commencing on the date such Event of Default occurred and ending on the Early Termination Date with respect to such Event of Default, as the Calculation Agent. Upon receipt of written request from Counterparty, the Calculation Agent shall promptly (but in no event later than within five (5) Exchange Business Days from the receipt of such request) provide Counterparty with a written explanation describing in reasonable detail any calculation, adjustment or determination made by it (including any quotations, market data or information from external sources used in making such calculation, adjustment or determination, as the case may be, but without disclosing GS&Co.’s proprietary models or other information that may be proprietary or confidential or subject to contractual, legal or regulatory obligations to not disclose such information). All calculations and determinations by the Calculation Agent in its capacity as Calculation Agent shall be made in good faith and in a commercially reasonable manner.

8

3.    Additional Mutual Representations, Warranties and Covenants of Each Party. In addition to the representations, warranties and covenants in the Agreement, each party represents, warrants and covenants to the other party that:

(a)    Eligible Contract Participant. It is an “eligible contract participant”, as defined in the U.S. Commodity Exchange Act (as amended), and is entering into each Transaction hereunder as principal (and not as agent or in any other capacity, fiduciary or otherwise) and not for the benefit of any third party.

(b)    Accredited Investor. Each party acknowledges that the offer and sale of each Transaction to it is intended to be exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”), by virtue of Section 4(a)(2) thereof. Accordingly, each party represents and warrants to the other that (i) it has the financial ability to bear the economic risk of its investment in each Transaction and is able to bear a total loss of its investment, (ii) it is an “accredited investor” as that term is defined under Regulation D under the Securities Act and (iii) the disposition of each Transaction is restricted under this Master Confirmation, the Securities Act and state securities laws.

4.    Additional Representations, Warranties and Covenants of Counterparty. In addition to the representations, warranties and covenants in the Agreement, Counterparty represents, warrants and covenants to GS&Co. that:

(a)    The purchase or writing of each Transaction and the transactions contemplated hereby will not violate Rule 13e-1 or Rule 13e-4 under the Exchange Act.

(b)    It is not entering into any Transaction (i) on the basis of, and is not aware of, any material non-public information with respect to the Shares (ii) in anticipation of, in connection with, or to facilitate, a distribution of its securities, a self tender offer or a third-party tender offer or (iii) to create actual or apparent trading activity in the Shares (or any security convertible into or exchangeable for the Shares) or to raise or depress or otherwise manipulate the price of the Shares (or any security convertible into or exchangeable for the Shares).

(c)    Each Transaction is being entered into pursuant to a publicly disclosed Share buy-back program and its Board of Directors has approved the use of derivatives to effect the Share buy-back program.

(d) Without limiting the generality of Section 13.1 of the Equity Definitions, Counterparty acknowledges that neither GS&Co. nor any of its affiliates is making any representations or warranties or taking any position or expressing any view with respect to the treatment of any Transaction under any accounting standards including ASC Topic 260, Earnings Per Share, ASC Topic 815, Derivatives and Hedging, or ASC Topic 480, Distinguishing Liabilities from Equity and ASC 815-40, Derivatives and Hedging – Contracts in Entity’s Own Equity.

(e)    As of (i) the date hereof and (ii) the Trade Date for each Transaction hereunder, Counterparty is in compliance with its reporting obligations under the Exchange Act and its most recent Annual Report on Form 10-K, together with all reports subsequently filed by it pursuant to the Exchange Act, taken together and as amended and supplemented to the date of this representation, do not, as of their respective filing dates, contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(f)    Counterparty shall report each Transaction as required under the Exchange Act and the rules and regulations thereunder.

(g)    The Shares are not, and Counterparty will not cause the Shares to be, subject to a “restricted period” (as defined in Regulation M promulgated under the Exchange Act) at any time during any Regulation M Period (as defined below) for any Transaction unless Counterparty has provided written notice to GS&Co. of such restricted period not later than the Scheduled Trading Day immediately preceding the first day of such “restricted period”; Counterparty acknowledges that any such notice may cause a Disrupted Day to occur pursuant to Section 5 below; accordingly, Counterparty acknowledges that its delivery of such notice must comply with the standards set forth in Section 6 below; “Regulation M Period” means, for any Transaction, (i) the Relevant Period (as defined

9

below) and (ii) the Settlement Valuation Period, if any, for such Transaction. “Relevant Period” means, for any Transaction, the period commencing on the Calculation Period Start Date for such Transaction and ending on the earlier of (i) the Scheduled Termination Date and (ii) the last Additional Relevant Day (as specified in the related Supplemental Confirmation) for such Transaction, or such earlier day as elected by GS&Co. and communicated to Counterparty on such day (or, if later, the First Acceleration Date without regard to any acceleration thereof pursuant to “Special Provisions for Acquisition Transaction Announcements” below).

(h)    As of the Trade Date, the Prepayment Date, the Initial Share Delivery Date and the Settlement Date for each Transaction, Counterparty is not “insolvent” (as such term is defined under Section 101(32) of the U.S. Bankruptcy Code (Title 11 of the United States Code) (the “Bankruptcy Code”)) and Counterparty would be able to purchase a number of Shares with a value equal to the Prepayment Amount in compliance with the laws of the jurisdiction of Counterparty’s incorporation.

(i)    Counterparty is not and, after giving effect to any Transaction, will not be, required to register as an “investment company” as such term is defined in the Investment Company Act of 1940, as amended.

(j)    Counterparty will not take any action or refrain from taking any action that would limit or in any way adversely affect GS&Co.’s rights under the Agreement, this Master Confirmation or any Supplemental Confirmation.

(k)    Counterparty has not entered into and will not enter into agreements similar to the Transactions described herein where any initial hedge period, calculation period, relevant period or settlement valuation period (each however defined) in such other transaction will overlap at any time (including as a result of extensions in such initial hedge period, calculation period, relevant period or settlement valuation period as provided in the relevant agreements) with any Relevant Period or, if applicable, any Settlement Valuation Period under this Master Confirmation. In the event that the initial hedge period, relevant period, calculation period or settlement valuation period in any other similar transaction overlaps with any Relevant Period or, if applicable, Settlement Valuation Period under this Master Confirmation as a result of any postponement of the Scheduled Termination Date or extension of the Settlement Valuation Period pursuant to “Valuation Disruption” above, Counterparty shall promptly amend such transaction to avoid any such overlap.

(l)    Counterparty represents and warrants that it and any of its subsidiaries has not applied, and shall not, until after the first date on which no portion of the Transaction remains outstanding following any final exercise and settlement, cancellation or early termination of the Transaction, apply, for a loan, loan guarantee, direct loan (as that term is defined in the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”)) or other investment, or to receive any financial assistance or relief under any program or facility (collectively “Financial Assistance”) that (a) is established under applicable law (whether in existence as of the Trade Date or subsequently enacted, adopted or amended), including without limitation the CARES Act and the Federal Reserve Act, as amended, and (b) (i) requires under applicable law (or any regulation, guidance, interpretation or other pronouncement of a governmental authority with jurisdiction for such program or facility) as a condition of such Financial Assistance, that the Counterparty comply with any requirement not to, or otherwise agree, attest, certify or warrant that it has not, as of the date specified in such condition, repurchased, or will not repurchase, any equity security of Counterparty, and that Counterparty has not, as of the date specified in the condition, made a capital distribution or will not make a capital distribution, or (ii) where the terms of the Transaction would cause Counterparty to fail to satisfy any condition for application for or receipt or retention of the Financial Assistance (collectively “Restricted Financial Assistance”); provided, that Counterparty or any of its subsidiaries may apply for Restricted Financial Assistance if Counterparty either (a) determines based on the advice of outside counsel of national standing that the terms of the Transaction would not cause Counterparty or any of its subsidiaries to fail to satisfy any condition for application for or receipt or retention of such Financial Assistance based on the terms of the program or facility as of the date of such advice or (b) delivers to GS&Co. evidence or other guidance from a governmental authority with jurisdiction for such program or facility that the Transaction is permitted under such program or facility (either by specific reference to the Transaction or by general reference to transactions with the attributes of the Transaction in all relevant respects).

10

5.    Regulatory Disruption. In the event that GS&Co. concludes, in its sole discretion, that it is appropriate with respect to any legal, regulatory or self-regulatory requirements or related policies and procedures (whether or not such requirements, policies or procedures are imposed by law or have been voluntarily adopted by GS&Co., but provided that such policies or procedures are related to legal, regulatory or self-regulatory issues and are generally applicable in similar situations and applied to any Transaction hereunder in a non-discriminatory manner), for it to refrain from or decrease any market activity on any Scheduled Trading Day or Days during the Calculation Period or, if applicable, the Settlement Valuation Period, GS&Co. may by written notice to Counterparty elect to deem that a Market Disruption Event has occurred and will be continuing on such Scheduled Trading Day or Days. Any such Scheduled Trading Day on which a Market Disruption Event is deemed to have occurred pursuant to this Section 5 shall be a Disrupted Day in full, and not a Disrupted Day only in part.

6.    10b5-1 Plan. Counterparty represents, warrants and covenants to GS&Co. that:

(a)    Counterparty is entering into this Master Confirmation and each Transaction hereunder in good faith and not as part of a plan or scheme to evade the prohibitions of Rule 10b5-1 under the Exchange Act (“Rule 10b5-1”) or any other antifraud or anti-manipulation provisions of the federal or applicable state securities laws and that it has not entered into or altered and will not enter into or alter any corresponding or hedging transaction or position with respect to the Shares. Counterparty acknowledges that it is the intent of the parties that each Transaction entered into under this Master Confirmation comply with the requirements of paragraphs (c)(1)(i)(A) and (B) of Rule 10b5-1 and each Transaction entered into under this Master Confirmation shall be interpreted to comply with the requirements of Rule 10b5-1(c).

(b)    Counterparty will not seek to control or influence GS&Co.’s decision to make any “purchases or sales” (within the meaning of Rule 10b5-1(c)(1)(i)(B)(3)) under any Transaction entered into under this Master Confirmation, including, without limitation, GS&Co.’s decision to enter into any hedging transactions. Counterparty represents and warrants that it has consulted with its own advisors as to the legal aspects of its adoption and implementation of this Master Confirmation and each Supplemental Confirmation under Rule 10b5-1.

(c)    Counterparty acknowledges and agrees that any amendment, modification, waiver or termination of this Master Confirmation or the relevant Supplemental Confirmation must be effected in accordance with the requirements for the amendment or termination of a “plan” as defined in Rule 10b5-1(c). Without limiting the generality of the foregoing, any such amendment, modification, waiver or termination shall be made in good faith and not as part of a plan or scheme to evade the prohibitions of Rule 10b-5, and no such amendment, modification, waiver or termination shall be made at any time at which Counterparty or any officer, director, manager or similar person of Counterparty is aware of any material non-public information regarding Counterparty or the Shares.

7.    Counterparty Purchases. Counterparty (or any “affiliated purchaser” as defined in Rule 10b-18 under the Exchange Act (“Rule 10b-18”)) shall not, without the prior written consent of GS&Co., directly or indirectly purchase any Shares (including by means of a derivative instrument), listed contracts on the Shares or securities that are convertible into, or exchangeable or exercisable for Shares (including, without limitation, any Rule 10b-18 purchases of blocks (as defined in Rule 10b-18)) during any Relevant Period or, if applicable, Settlement Valuation Period, except through GS&Co and, if GS&Co is requested to make any such purchases, GS&Co will cooperate in good faith with Counterparty to execute mutually acceptable documentation pursuant to which GS&Co. or its affiliate shall make any such purchases. However, the foregoing shall not limit Counterparty’s ability (or the ability of any “agent independent of the issuer” (as defined in Rule 10b-18)), pursuant to any “plan” (as defined in Rule 10b-18) of Counterparty, to reacquire Shares from plan participants in connection with any equity transaction related to such plan or to limit Counterparty’s ability to withhold Shares to cover tax liabilities associated with such equity transactions or otherwise restrict Counterparty’s ability to repurchase Shares under privately negotiated or off-market transactions (including, without limitation, an agreement relating to Counterparty’s 401(k) Plan or transactions with any of Counterparty’s employees, officers, directors or affiliates), so long as any such reacquisition, withholding or repurchase does not constitute a “Rule 10b-18 purchase” (as defined in Rule 10b-18) and is not reasonably expected to result in any purchases in the open market.

11

8.    Special Provisions for Merger Transactions. Notwithstanding anything to the contrary herein or in the Equity Definitions:

(a) Counterparty agrees that it:

(i)    will not during the period commencing on the Trade Date through the end of the Relevant Period or, if applicable, the Settlement Valuation Period for any Transaction make, or permit to be made, any public announcement (as defined in Rule 165(f) under the Securities Act) of any Merger Transaction or potential Merger Transaction (a “Public Announcement”) unless such Public Announcement is made prior to the opening or after the close of the regular trading session on the Exchange for the Shares;

(ii)    shall promptly (but in any event prior to the next opening of the regular trading session on the Exchange) notify GS&Co. following any such Public Announcement that such Public Announcement has been made; and

(iii)    shall promptly (but in any event prior to the next opening of the regular trading session on the Exchange) provide GS&Co. with written notice specifying (i) Counterparty’s average daily Rule 10b-18 Purchases (as defined in Rule 10b-18) during the three full calendar months immediately preceding the date of such Public Announcement that were not effected through GS&Co. or its affiliates and (ii) the number of Shares purchased pursuant to the proviso in Rule 10b-18(b)(4) under the Exchange Act for the three full calendar months preceding the date of such Public Announcement. Such written notice shall be deemed to be a certification by Counterparty to GS&Co. that such information is true and correct. In addition, Counterparty shall promptly notify GS&Co. of the earlier to occur of the completion of the relevant Merger Transaction and the completion of the vote by target shareholders.

(b)    Counterparty acknowledges that a Public Announcement may cause the terms of any Transaction to be adjusted or such Transaction to be terminated; accordingly, Counterparty acknowledges that in making any Public Announcement, it must comply with the standards set forth in Section 6 above.

(c)    Upon the occurrence of any Public Announcement (whether made by Counterparty or a third party) GS&Co. in its sole discretion may (i) make commercially reasonable adjustments to the terms of any Transaction, including, without limitation, the Scheduled Termination Date or the Forward Price Adjustment Amount, and/or suspend the Calculation Period and/or any Settlement Valuation Period to account for the economic effect of such Public Announcement on such Transaction or (ii) treat the occurrence of such Public Announcement as an Additional Termination Event with Counterparty as the sole Affected Party and the Transactions hereunder as the Affected Transactions and with the amount under Section 6(e) of the Agreement determined taking into account the fact that the Calculation Period or Settlement Valuation Period, as the case may be, had fewer Scheduled Trading Days than originally anticipated.

“Merger Transaction” means any merger, acquisition or similar transaction involving a recapitalization as contemplated by Rule 10b-18(a)(13)(iv) under the Exchange Act.

9.    Special Provisions for Acquisition Transaction Announcements. (a) If an Acquisition Transaction Announcement occurs on or prior to the Settlement Date for any Transaction, then the Number of Shares to be Delivered for such Transaction shall be determined as if (i) of the definition of Divisor Amount thereof were replaced with “(i) the Forward Price”. If an Acquisition Transaction Announcement occurs after the Trade Date, but prior to the First Acceleration Date of any Transaction, the First Acceleration Date shall be the date of such Acquisition Transaction Announcement.

(b)    “Acquisition Transaction Announcement” means (i) the announcement of an Acquisition Transaction, (ii) an announcement that Counterparty or any of its subsidiaries has entered into an agreement, a letter of intent or an understanding designed to result in an Acquisition Transaction, (iii) the announcement of the intention to solicit or enter into, or to explore strategic alternatives or other similar undertaking that may include, an Acquisition Transaction, (iv) any other announcement that in the reasonable judgment of the Calculation Agent may result in an Acquisition Transaction or (v) any announcement of any change or amendment to any previous

12

Acquisition Transaction Announcement (including any announcement of the abandonment of any such previously announced Acquisition Transaction, agreement, letter of intent, understanding or intention). For the avoidance of doubt, announcements as used in the definition of Acquisition Transaction Announcement refer to any public announcement whether made by the Issuer or a third party.

(c)    “Acquisition Transaction” means (i) any Merger Event (for purposes of this definition the definition of Merger Event shall be read with the references therein to “100%” being replaced by “30%” and without reference to the clause beginning immediately following the definition of Reverse Merger therein to the end of such definition), Tender Offer or Merger Transaction or any other transaction involving the merger of Counterparty with or into any third party, (ii) the sale or transfer of all or substantially all of the assets of Counterparty, (iii) a recapitalization, reclassification, binding share exchange or other similar transaction, (iv) any acquisition, lease, exchange, transfer, disposition (including by way of spin-off or distribution) of assets (including any capital stock or other ownership interests in subsidiaries) or other similar event by Counterparty or any of its subsidiaries where the aggregate consideration transferable or receivable by or to Counterparty or its subsidiaries exceeds 15% of the market capitalization of Counterparty and (v) any transaction in which Counterparty or its board of directors has a legal obligation to make a recommendation to its shareholders in respect of such transaction (whether pursuant to Rule 14e-2 under the Exchange Act or otherwise).

10.    Acknowledgments. (a) The parties hereto intend for:

(i)    each Transaction to be a “securities contract” as defined in Section 741(7) of the Bankruptcy Code, a “swap agreement” as defined in Section 101(53B) of the Bankruptcy Code and a “forward contract” as defined in Section 101(25) of the Bankruptcy Code, and the parties hereto to be entitled to the protections afforded by, among other Sections, Sections 362(b)(6), 362(b)(17), 362(b)(27), 362(o), 546(e), 546(g), 546(j), 555, 556, 560 and 561 of the Bankruptcy Code;

(ii)    the Agreement to be a “master netting agreement” as defined in Section 101(38A) of the Bankruptcy Code;

(iii)    a party’s right to liquidate, terminate or accelerate any Transaction, net out or offset termination values or payment amounts, and to exercise any other remedies upon the occurrence of any Event of Default or Termination Event under the Agreement with respect to the other party or any Extraordinary Event that results in the termination or cancellation of any Transaction to constitute a “contractual right” (as defined in the Bankruptcy Code); and

(iv)    all payments for, under or in connection with each Transaction, all payments for the Shares (including, for the avoidance of doubt, payment of the Prepayment Amount) and the transfer of such Shares to constitute “settlement payments” and “transfers” (as defined in the Bankruptcy Code).

(b)    Counterparty acknowledges that:

(i)    during the term of any Transaction, GS&Co. and its affiliates may buy or sell Shares or other securities or buy or sell options or futures contracts or enter into swaps or other derivative securities in order to establish, adjust or unwind its hedge position with respect to such Transaction;

(ii)    GS&Co. and its affiliates may also be active in the market for the Shares and derivatives linked to the Shares other than in connection with hedging activities in relation to any Transaction, including acting as agent or as principal and for its own account or on behalf of customers;

(iii)    GS&Co. shall make its own determination as to whether, when or in what manner any hedging or market activities in Counterparty’s securities shall be conducted and shall do so in a manner that it deems appropriate to hedge its price and market risk with respect to the Forward Price and the VWAP Price;

13

(iv)    any market activities of GS&Co. and its affiliates with respect to the Shares may affect the market price and volatility of the Shares, as well as the Forward Price and VWAP Price, each in a manner that may be adverse to Counterparty; and

(v)    each Transaction is a derivatives transaction in which it has granted GS&Co. an option; GS&Co. may purchase shares for its own account at an average price that may be greater than, or less than, the price paid by Counterparty under the terms of the related Transaction.

(c)    Counterparty:

(i)    is an “institutional account” as defined in FINRA Rule 4512(c);

(ii)    is capable of evaluating investment risks independently, both in general and with regard to all transactions and investment strategies involving a security or securities, and will exercise independent judgment in evaluating the recommendations of GS&Co. or its associated persons, unless it has otherwise notified GS&Co. in writing; and

(iii)    will notify GS&Co. if any of the statements contained in clause (i) or (ii) of this Section 10(c) ceases to be true.

11.    Credit Support Documents. The parties hereto acknowledge that no Transaction hereunder is secured by any collateral that would otherwise secure the obligations of Counterparty herein or pursuant to the Agreement.

12.    No Set-off. Obligations under the Transactions shall not be netted, recouped or set off (including pursuant to Section 6 of the Agreement) against any other obligations of the parties, whether arising under the Agreement, this Master Confirmation, any Supplemental Confirmation, or under any other agreement between the parties hereto, by operation of law or otherwise, and no other obligations of the parties shall be netted, recouped or set off (including pursuant to Section 6 of the Agreement) against obligations under the Transactions, whether arising under the Agreement, this Master Confirmation, ay Supplemental Confirmation or under any other agreement between the parties hereto, by operation of law or otherwise, and each party hereby waives any such right of setoff, netting or recoupment.

13.    Delivery of Shares. Notwithstanding anything to the contrary herein, GS&Co. may, by prior notice to Counterparty, satisfy its obligation to deliver any Shares or other securities on any date due (an “Original Delivery Date”) by making separate deliveries of Shares or such securities, as the case may be, at more than one time on or prior to such Original Delivery Date, so long as the aggregate number of Shares and other securities so delivered on or prior to such Original Delivery Date is equal to the number required to be delivered on such Original Delivery Date.

14.    Early Termination. In the event that an Early Termination Date (whether as a result of an Event of Default or a Termination Event) occurs or is designated with respect to any Transaction (except as a result of a Merger Event in which the consideration or proceeds to be paid to holders of Shares consists solely of cash), if either party would owe any amount to the other party pursuant to Section 6(d)(ii) of the Agreement (any such amount, a “Payment Amount”), then, in lieu of any payment of such Payment Amount, Counterparty may, no later than the Early Termination Date or the date on which such Transaction is terminated, elect to deliver or for GS&Co. to deliver, as the case may be, to the other party a number of Shares (or, in the case of a Merger Event, a number of units, each comprising the number or amount of the securities or property that a hypothetical holder of one Share would receive in such Merger Event (each such unit, an “Alternative Delivery Unit” and, the securities or property comprising such unit, “Alternative Delivery Property”)) with a value equal to the Payment Amount, as determined by the Calculation Agent (and the parties agree that, in making such determination of value, the Calculation Agent may take into account a number of factors, including the market price of the Shares or Alternative Delivery Property on the date of early termination and, if such delivery is made by GS&Co., the prices at which GS&Co. purchases Shares or Alternative Delivery Property to fulfill its delivery obligations under this Section 14 (provided that such purchase prices reflect the prevailing market prices of the Shares or Alternative Delivery Property, as the case may be)); provided that in determining the composition of any Alternative Delivery Unit, if the relevant Merger Event

14

involves a choice of consideration to be received by holders, such holder shall be deemed to have elected to receive the maximum possible amount of cash; and provided further that Counterparty may make such election only if Counterparty represents and warrants to GS&Co. in writing on the date it notifies GS&Co. of such election that, as of such date, Counterparty is not aware of any material non-public information concerning the Shares and is making such election in good faith and not as part of a plan or scheme to evade compliance with the federal securities laws. If such delivery is made by Counterparty, paragraphs 2 through 7 of Annex A shall apply as if such delivery were a settlement of the Transaction to which Net Share Settlement applied, the Cash Settlement Payment Date were the Early Termination Date and the Forward Cash Settlement Amount were zero (0) minus the Payment Amount owed by Counterparty.

15.    Calculations and Payment Date upon Early Termination. The parties acknowledge and agree that in calculating Loss pursuant to Section 6 of the Agreement GS&Co. may (but need not) determine losses without reference to actual losses incurred but based on expected losses assuming a commercially reasonable (including without limitation with regard to reasonable legal and regulatory guidelines) risk bid were used to determine loss to avoid awaiting the delay associated with closing out any commercially reasonable hedge position in a commercially reasonable manner prior to or promptly following the designation of an Early Termination Date. Notwithstanding anything to the contrary herein or in Section 6(d)(ii) of the Agreement or in the Equity Definitions, all amounts calculated as being due in respect of an Early Termination Date under Section 6(e) of the Agreement or other termination or cancellation of a Transaction hereunder will be payable on the day that notice of the amount payable is effective; provided that if Counterparty elects to receive Shares or Alternative Delivery Property in accordance with Section 14, such Shares or Alternative Delivery Property shall be delivered on a date selected by GS&Co. as promptly as practicable.

16.    Automatic Termination Provisions. Notwithstanding anything to the contrary in Section 6 of the Agreement, if a Termination Price is specified in any Supplemental Confirmation, then an Additional Termination Event with Counterparty as the sole Affected Party and the Transaction to which such Supplemental Confirmation relates as the Affected Transaction will automatically occur without any notice or action by GS&Co. or Counterparty if the price of the Shares on the Exchange at any time falls below such Termination Price, and the Exchange Business Day that the price of the Shares on the Exchange at any time falls below the Termination Price will be the “Early Termination Date” for purposes of the Agreement.

17.    Delivery of Cash. For the avoidance of doubt, nothing in this Master Confirmation shall be interpreted as requiring Counterparty to deliver cash in respect of the settlement of the Transactions contemplated by this Master Confirmation following payment by Counterparty of the relevant Prepayment Amount, except in circumstances where the required cash settlement thereof is permitted for classification of the contract as equity by ASC 815-40, Derivatives and Hedging – Contracts in Entity’s Own Equity, as in effect on the relevant Trade Date (including, without limitation, where Counterparty so elects to deliver cash or fails timely to elect to deliver Shares or Alternative Delivery Property in respect of the settlement of such Transactions).

18.    Claim in Bankruptcy. GS&Co. acknowledges and agrees that this Confirmation is not intended to convey to it rights with respect to the Transactions that are senior to the claims of common stockholders in the event of Counterparty’s bankruptcy.

19.    Amendments to the Equity Definitions.

(a)    Section 11.2(a) of the Equity Definitions is hereby amended by (i) replacing the words “a diluting or concentrative” with the word “an” and (ii) adding the phrase “or such Transaction” at the end thereof;

(b)    Section 11.2(c) of the Equity Definitions is hereby amended by (i) replacing the words “a diluting or concentrative” with the word “an” in the fifth line thereof, (ii) adding the phrase “or such Transaction” immediately following the word “Shares” in the sixth line thereof, (iii) deleting the words “dilutive or concentrative” in the sixth to last line thereof and (iv) replacing the phrase “(provided that no adjustments will be made to account solely for changes in volatility, expected dividends, stock loan rate or liquidity relative to the relevant Share)” with the phrase “(and, for the avoidance of doubt, adjustments may be made to account for changes in volatility, expected dividends, stock loan rate or liquidity relative to the relevant Share)”; and

15

(c)    Section 11.2(e)(vii) of the Equity Definitions is hereby amended by (i) replacing the words “a diluting or concentrative” with the word “an” and (ii) adding the phrase “or the relevant Transaction” at the end thereof.

20.    Governing Law. The Agreement, this Master Confirmation, each Supplemental Confirmation and all matters arising in connection with the Agreement, this Master Confirmation and each Supplemental Confirmation shall be governed by, and construed and enforced in accordance with, the laws of the State of New York (without reference to its choice of laws doctrine other than Title 14 of Article 5 of the New York General Obligations Law).

21.    Illegality. The parties agree that, for the avoidance of doubt, for purposes of Section 5(b)(i) of the Agreement, “any applicable law” shall include the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, any rules and regulations promulgated thereunder and any similar law or regulation, without regard to Section 739 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 or any similar legal certainty provision in any legislation enacted, or rule or regulation promulgated, on or after the Trade Date, and the consequences specified in the Agreement, including without limitation, the consequences specified in Section 6 of the Agreement, shall apply to any Illegality arising from any such act, rule or regulation.

(a)    The Office of GS&Co. for each Transaction is: 200 West Street, New York, New York 10282-2198.

(b)    The Office of Counterparty for each Transaction is: Inapplicable, Counterparty is not a Multibranch Party.

23.    Submission to Jurisdiction. Section 13(b) of the Agreement is amended by deleting the phrase “non-” from the second line of clause (b)(i) thereof.

24.    Waiver of Jury Trial. EACH PARTY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY SUIT, ACTION OR PROCEEDING RELATING TO THE AGREEMENT, THIS MASTER CONFIRMATION, EACH SUPPLEMENTAL CONFIRMATION, THE TRANSACTIONS HEREUNDER AND ALL MATTERS ARISING IN CONNECTION WITH THE AGREEMENT, THIS MASTER CONFIRMATION AND ANY SUPPLEMENTAL CONFIRMATION AND THE TRANSACTIONS HEREUNDER. EACH PARTY (I) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF THE OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF SUCH A SUIT, ACTION OR PROCEEDING, SEEK TO ENFORCE THE FOREGOING WAIVER AND (II) ACKNOWLEDGES THAT IT AND THE OTHER PARTY HAVE BEEN INDUCED TO ENTER INTO THE TRANSACTIONS, AS APPLICABLE, BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS PROVIDED HEREIN.

25.    U.S. Resolution Stay Provisions.

(a)     Recognition of the U.S. Special Resolution Regimes

(i)    In the event that GS&Co. becomes subject to a proceeding under (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder or (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder (a “U.S. Special Resolution Regime”) the transfer from GS&Co. of this Confirmation, and any interest and obligation in or under, and any property securing, this Confirmation, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Confirmation, and any interest and obligation in or under, and any property securing, this Confirmation were governed by the laws of the United States or a state of the United States.

(ii)    In the event that GS&Co. or an Affiliate becomes subject to a proceeding under a U.S. Special Resolution Regime, any Default Rights (as defined in 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable (“Default Right”)) under this Confirmation that may be exercised against GS&Co. are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Confirmation were governed by the laws of the United States or a state of the United States.

16

(b)    Limitation on Exercise of Certain Default Rights Related to an Affiliate’s Entry Into Insolvency Proceedings. Notwithstanding anything to the contrary in this Confirmation, the parties expressly acknowledge and agree that:

(i)    Counterparty shall not be permitted to exercise any Default Right with respect to this Confirmation or any Affiliate Credit Enhancement that is related, directly or indirectly, to an Affiliate of the GS&Co. becoming subject to receivership, insolvency, liquidation, resolution, or similar proceeding (an “Insolvency Proceeding”), except to the extent that the exercise of such Default Right would be permitted under the provisions of 12 C.F.R. 252.84, 12 C.F.R. 47.5 or 12 C.F.R. 382.4, as applicable; and

(ii)    Nothing in this Confirmation shall prohibit the transfer of any Affiliate Credit Enhancement, any interest or obligation in or under such Affiliate Credit Enhancement, or any property securing such Affiliate Credit Enhancement, to a transferee upon or following an Affiliate of GS&Co. becoming subject to an Insolvency Proceeding, unless the transfer would result in the Counterparty being the beneficiary of such Affiliate Credit Enhancement in violation of any law applicable to the Counterparty.

(iii)    For the purpose of this paragraph:

A.    “Affiliate” is defined in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k).

B.    “Credit Enhancement” means any credit enhancement or credit support arrangement in support of the obligations of GS&Co. under or with respect to this Confirmation, including any guarantee, collateral arrangement (including any pledge, charge, mortgage or other security interest in collateral or title transfer arrangement), trust or similar arrangement, letter of credit, transfer of margin or any similar arrangement.

(c)    U.S. Protocol. If Counterparty has previously adhered to, or subsequently adheres to, the ISDA 2018 U.S. Resolution Stay Protocol as published by the International Swaps and Derivatives Association, Inc. as of July 31, 2018 (the “ISDA U.S. Protocol”), the terms of such protocol shall be incorporated into and form a part of this Confirmation and the terms of the ISDA U.S. Protocol shall supersede and replace the terms of this section. For purposes of incorporating the ISDA U.S. Protocol, GS&Co. shall be deemed to be a Regulated Entity, Counterparty shall be deemed to be an Adhering Party, and this Confirmation shall be deemed to be a Protocol Covered Agreement. Capitalized terms used but not defined in this paragraph shall have the meanings given to them in the ISDA U.S. Protocol.

(d)    Pre-existing In-Scope Agreements. GS&Co. and Counterparty agree that to the extent there are any outstanding “in-scope QFCs,” as defined in 12 C.F.R. § 252.82(d), that are not excluded under 12 C.F.R. § 252.88, between GS&Co. and Counterparty that do not otherwise comply with the requirements of 12 C.F.R. § 252.2, 252.81–8 (each such agreement, a “Preexisting In-Scope Agreement”), then each such Preexisting In-Scope Agreement is hereby amended to include the foregoing provisions in this section, with references to “this Confirmation” being understood to be references to the applicable Preexisting In-Scope Agreement.

26.    Counterparts. This Master Confirmation may be executed in any number of counterparts, all of which shall constitute one and the same instrument, and any party hereto may execute this Master Confirmation by signing and delivering one or more counterparts.

17

Counterparty hereby agrees (a) to check this Master Confirmation carefully and immediately upon receipt so that errors or discrepancies can be promptly identified and rectified and (b) to confirm that the foregoing (in the exact form provided by GS&Co.) correctly sets forth the terms of the agreement between GS&Co. and Counterparty with respect to any particular Transaction to which this Master Confirmation relates, by manually or electronically signing this Master Confirmation or this page hereof as evidence of agreement to such terms and providing the other information requested herein and immediately returning an executed copy to Equity Derivatives Documentation Department, Facsimile No. 212-428-1980/83 or by email to Eq-derivs-notifications@am.ibd.gs.com.

SCHEDULE A

SUPPLEMENTAL CONFIRMATION

The purpose of this Supplemental Confirmation is to confirm the terms and conditions of the Transaction entered into between Goldman Sachs & Co. LLC (“GS&Co.”) and Ciena Corporation (“Counterparty”) (together, the “Contracting Parties”) on the Trade Date specified below. This Supplemental Confirmation is a binding contract between GS&Co. and Counterparty as of the relevant Trade Date for the Transaction referenced below.

1.    This Supplemental Confirmation supplements, forms part of, and is subject to the Master Confirmation dated as of December 13, 2021 (the “Master Confirmation”) between the Contracting Parties, as amended and supplemented from time to time. All provisions contained in the Master Confirmation govern this Supplemental Confirmation except as expressly modified below.

2.    The terms of the Transaction to which this Supplemental Confirmation relates are as follows:

A-1

3.    Counterparty represents and warrants to GS&Co. that neither it nor any “affiliated purchaser” (as defined in Rule 10b-18 under the Exchange Act) has made any purchases of blocks pursuant to the proviso in Rule 10b-18(b)(4) under the Exchange Act during either (i) the four full calendar weeks immediately preceding the Trade Date or (ii) during the calendar week in which the Trade Date occurs.

4.    This Supplemental Confirmation may be executed in any number of counterparts, all of which shall constitute one and the same instrument, and any party hereto may execute this Supplemental Confirmation by signing and delivering one or more counterparts.

A-2

Counterparty hereby agrees (a) to check this Supplemental Confirmation carefully and immediately upon receipt so that errors or discrepancies can be promptly identified and rectified and (b) to confirm that the foregoing (in the exact form provided by GS&Co.) correctly sets forth the terms of the agreement between GS&Co. and Counterparty with respect to the Transaction to which this Supplemental Confirmation relates, by manually or electronically signing this Supplemental Confirmation or this page hereof as evidence of agreement to such terms and providing the other information requested herein and immediately returning an executed copy to Equity Derivatives Documentation Department, facsimile No. 212-428-1980/83 or by email to Eq-derivs-notifications@am.ibd.gs.com.

A-3

ANNEX A

COUNTERPARTY SETTLEMENT PROVISIONS

1.    The following Counterparty Settlement Provisions shall apply to the extent indicated under the Master Confirmation:

1

2.    Net Share Settlement shall be made by delivery on the Cash Settlement Payment Date of a number of Shares satisfying the conditions set forth in paragraph 3 below (the “Registered Settlement Shares”), or a number of Shares not satisfying such conditions (the “Unregistered Settlement Shares”), in either case with a value equal to the absolute value of the Forward Cash Settlement Amount, with such Shares’ value based on the value thereof to GS&Co. (which value shall, in the case of Unregistered Settlement Shares, take into account a commercially reasonable illiquidity discount), in each case as determined by the Calculation Agent.

3.    Counterparty may only deliver Registered Settlement Shares pursuant to paragraph 2 above if:

(a)    a registration statement covering public resale of the Registered Settlement Shares by GS&Co. (the “Registration Statement”) shall have been filed with the Securities and Exchange Commission under the Securities Act and been declared or otherwise become effective on or prior to the date of delivery, and no stop order shall be in effect with respect to the Registration Statement; a printed prospectus relating to the Registered Settlement Shares (including any prospectus supplement thereto, the “Prospectus”) shall have been delivered to GS&Co., in such quantities as GS&Co. shall reasonably have requested, on or prior to the date of delivery;

(b)    the form and content of the Registration Statement and the Prospectus (including, without limitation, any sections describing the plan of distribution) shall be satisfactory to GS&Co.;

(c)    as of or prior to the date of delivery, GS&Co. and its agents shall have been afforded a reasonable opportunity to conduct a due diligence investigation with respect to Counterparty customary in scope for underwritten offerings of equity securities and the results of such investigation are satisfactory to GS&Co., in its discretion; and

(d)    as of the date of delivery, an agreement (the “Underwriting Agreement”) shall have been entered into with GS&Co. in connection with the public resale of the Registered Settlement Shares by GS&Co. substantially similar to underwriting agreements customary for underwritten offerings of equity securities, in form and substance satisfactory to GS&Co., which Underwriting Agreement shall include, without limitation, provisions substantially similar to those contained in such underwriting agreements relating, without limitation, to the indemnification of, and contribution in connection with the liability of, GS&Co. and its affiliates and the provision of customary opinions, accountants’ comfort letters and lawyers’ negative assurance letters.

4.    If Counterparty delivers Unregistered Settlement Shares pursuant to paragraph 2 above:

(a)    all Unregistered Settlement Shares shall be delivered to GS&Co. (or any affiliate of GS&Co. designated by GS&Co.) pursuant to the exemption from the registration requirements of the Securities Act provided by Section 4(a)(2) thereof;

(b)    as of or prior to the date of delivery, GS&Co. and any potential purchaser of any such shares from GS&Co. (or any affiliate of GS&Co. designated by GS&Co.) identified by GS&Co. shall be afforded a

2

commercially reasonable opportunity to conduct a due diligence investigation with respect to Counterparty customary in scope for private placements of equity securities (including, without limitation, the right to have made available to them for inspection all financial and other records, pertinent corporate documents and other information reasonably requested by them);

(c)    as of the date of delivery, Counterparty shall enter into an agreement (a “Private Placement Agreement”) with GS&Co. (or any affiliate of GS&Co. designated by GS&Co.) in connection with the private placement of such shares by Counterparty to GS&Co. (or any such affiliate) and the private resale of such shares by GS&Co. (or any such affiliate), substantially similar to private placement purchase agreements customary for private placements of equity securities, in form and substance commercially reasonably satisfactory to GS&Co., which Private Placement Agreement shall include, without limitation, provisions substantially similar to those contained in such private placement purchase agreements relating, without limitation, to the indemnification of, and contribution in connection with the liability of, GS&Co. and its affiliates and the provision of customary opinions, accountants’ comfort letters and lawyers’ negative assurance letters (provided that the private placement agreement shall only require that the Counterparty use best efforts to provide customary opinions, accountants’ comfort letters, and lawyers’ negative assurance letters), and shall provide for the payment by Counterparty of all commercially reasonable fees and expenses in connection with such resale, including all commercially reasonable fees and expenses of counsel for GS&Co., and shall contain representations, warranties, covenants and agreements of Counterparty reasonably necessary or advisable to establish and maintain the availability of an exemption from the registration requirements of the Securities Act for such resales; and

(d)    in connection with the private placement of such shares by Counterparty to GS&Co. (or any such affiliate) and the private resale of such shares by GS&Co. (or any such affiliate), Counterparty shall, if so requested by GS&Co., prepare, in cooperation with GS&Co., a private placement memorandum in form and substance reasonably satisfactory to GS&Co.

5.    GS&Co., itself or through an affiliate (the “Selling Agent”) or any underwriter(s), will sell all, or such lesser portion as may be required hereunder, of the Registered Settlement Shares or Unregistered Settlement Shares and any Makewhole Shares (as defined below) (together, the “Settlement Shares”) delivered by Counterparty to GS&Co. pursuant to paragraph 6 below commencing on the Cash Settlement Payment Date and continuing until the date on which the aggregate Net Proceeds (as such term is defined below) of such sales, as determined by GS&Co., is equal to the absolute value of the Forward Cash Settlement Amount (such date, the “Final Resale Date”). If the proceeds of any sale(s) made by GS&Co., the Selling Agent or any underwriter(s), net of any commercially reasonable fees and commissions (including, without limitation, underwriting or placement fees) customary for similar transactions under the circumstances at the time of the offering, together with carrying charges and expenses incurred in connection with the offer and sale of the Shares (including, but without limitation to, the covering of any over-allotment or short position (syndicate or otherwise)) (the “Net Proceeds”) exceed the absolute value of the Forward Cash Settlement Amount, GS&Co. will refund, in USD, such excess to Counterparty on the date that is three (3) Currency Business Days following the Final Resale Date, and, if any portion of the Settlement Shares remains unsold, GS&Co. shall return to Counterparty on that date such unsold Shares.

6.    If the Calculation Agent determines that the Net Proceeds received from the sale of the Registered Settlement Shares or Unregistered Settlement Shares or any Makewhole Shares, if any, pursuant to this paragraph 6 are less than the absolute value of the Forward Cash Settlement Amount (the amount in USD by which the Net Proceeds are less than the absolute value of the Forward Cash Settlement Amount being the “Shortfall” and the date on which such determination is made, the “Deficiency Determination Date”), Counterparty shall on the Exchange Business Day next succeeding the Deficiency Determination Date (the “Makewhole Notice Date”) deliver to GS&Co., through the Selling Agent, a notice of Counterparty’s election that Counterparty shall either (i) pay an amount in cash equal to the Shortfall on the day that is one (1) Currency Business Day after the Makewhole Notice Date, or (ii) deliver additional Shares. If Counterparty elects to deliver to GS&Co. additional Shares, then Counterparty shall deliver additional Shares in compliance with the terms and conditions of paragraph 3 or paragraph 4 above, as the case may be (the “Makewhole Shares”), on the first Clearance System Business Day which is also an Exchange Business Day following the Makewhole Notice Date in such number as the Calculation Agent reasonably believes would have a market value on that Exchange Business Day equal to the Shortfall. Such Makewhole Shares shall be sold by GS&Co. in accordance with the provisions above; provided that if the sum of the Net Proceeds from the sale of the originally delivered Shares and the Net Proceeds from the sale of any

3

Makewhole Shares is less than the absolute value of the Forward Cash Settlement Amount then Counterparty shall, at its election, either make such cash payment or deliver to GS&Co. further Makewhole Shares until such Shortfall has been reduced to zero. For the avoidance of doubt, Counterparty is not obligated to satisfy any Shortfall in cash.

7.    Notwithstanding the foregoing, in no event shall the aggregate number of Settlement Shares and Makewhole Shares be greater than the Reserved Shares minus the amount of any Shares actually delivered by Counterparty under any other Transaction(s) under this Master Confirmation (the result of such calculation, the “Capped Number”). Counterparty represents and warrants (which shall be deemed to be repeated on each day that a Transaction is outstanding) that the Capped Number is equal to or less than the number of Shares determined according to the following formula:

A – B

“Reserved Shares” means initially, 6,745,817 Shares. The Reserved Shares may be increased or decreased in a Supplemental Confirmation.

4

Exhibit 99.1

Ciena Announces $250 Million Accelerated Share Repurchase Agreement

HANOVER, Md.— December 14, 2021

Ciena Corporation (NYSE: CIEN) (the “Company”) today announced that it has entered into an accelerated share repurchase (ASR) agreement with Goldman Sachs & Co. LLC (“Goldman”) to repurchase $250.0 million of the Company’s common stock as part of the Company’s previously announced $1.0 billion share repurchase program. The Company expects to fund the ASR from cash on hand and cash generated from operations.

Under the ASR agreement, the Company will make a payment of $250.0 million to Goldman, and will receive an initial share delivery of approximately 2.7 million shares from Goldman, representing approximately 80% of the expected share repurchases under the ASR agreement, based on the closing price of the common stock of $74.12 on December 13, 2021. The final number of shares of common stock to ultimately be purchased by the Company under the ASR agreement will be based generally on the average of the daily volume-weighted average prices of the common stock during the term of the transaction, less a discount and subject to adjustments pursuant to the terms and conditions of the ASR agreement. Final settlement of the transactions under the ASR agreement is expected to occur during the fiscal quarter ending April 30, 2022.

About Ciena

Ciena (NYSE: CIEN) is a networking systems, services and software company. We provide solutions that help our customers create the Adaptive Network^TM in response to the constantly changing demands of their end-users. By delivering best-in-class networking technology through high-touch consultative relationships, we build the world’s most agile networks with automation, openness and scale. For updates on Ciena, follow us on Twitter @Ciena, LinkedIn, the Ciena Insights blog, or visit www.ciena.com.

Note to Ciena Investors

You are encouraged to review the Investors section of our website, where we routinely post press releases, SEC filings, recent news, financial results, and other announcements. From time to time we exclusively post material information to this website along with other disclosure channels that we use. This press release contains certain forward-looking statements that are based on our current expectations, forecasts, information and assumptions, including statements about the expected completion date of the ASR and expected numbers of shares to be delivered under the ASR agreement. These statements involve inherent risks and uncertainties. Actual results or outcomes may differ materially from those stated or implied, because of risks and uncertainties, including that we cannot guarantee that share repurchases will enhance long-term stockholder value, and that share repurchases could increase the volatility of the price of our stock and diminish our cash reserves, and those risks and uncertainties detailed in our most recent annual and quarterly reports filed with the SEC. Forward-looking statements include statements regarding our expectations, beliefs, intentions or strategies and can be identified by words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “should,” “will,” and “would” or similar words. Ciena assumes no obligation to update the information included in this press release, whether as a result of new information, future events or otherwise.