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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

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                                 FORM 10-K/A


                ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934

                   FOR THE FISCAL YEAR ENDED OCTOBER 31, 2000
                       COMMISSION FILE NUMBER: 0-21969

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                              CIENA CORPORATION
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


                     DELAWARE                       23-2725311
           (STATE OR OTHER JURISDICTION OF          (IRS EMPLOYER
            INCORPORATION OR ORGANIZATION)          IDENTIFICATION
                                                    NO.)

                             1201 WINTERSON ROAD
                          LINTHICUM, MARYLAND 21090
                                (410) 865-8500
        (ADDRESS AND TELEPHONE NUMBER OF PRINCIPAL EXECUTIVE OFFICES)


         SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
                                     NONE


         SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:
                         COMMON STOCK, $.01 PAR VALUE
                                TITLE OF CLASS


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                               EXPLANATORY NOTE

This 10-K/A is being filed because an opinion on the Financial Statement
Schedule was inadvertently omitted from the Company's Form 10-K for the year
ended October 31, 2000, filed on December 7, 2000.

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

      (a)    The following documents are filed as a part of this Form:

             1.    Financial Statement Schedules:

                        VALUATION AND QUALIFYING ACCOUNTS
                                 (In thousands)
Balance at beginning of Balance at end period Provisions Deductions of period ------------ ---------- ------------- --------------- Year ended October 31, 1998 Allowance for doubtful accounts $ 722 $ 806 $ -- $ 1,528 Allowance for excess and obsolete inventory $ 7,466 $ 9,617 $5,929 $11,154 Year ended October 31, 1999 Allowance for doubtful accounts $ 1,528 $ 250 $ 75 $ 1,703 Allowance for excess and obsolete inventory $11,154 $ 6,534 $5,243 $12,445 Year ended October 31, 2000 Allowance for doubtful accounts $ 1,703 $28,010 $ 132 $29,581 Allowance for excess and obsolete inventory $12,445 $15,021 $9,228 $18,238
REPORT OF INDEPENDENT ACCOUNTANTS ON FINANCIAL STATEMENT SCHEDULE To the Board of Directors and Stockholders of CIENA Corporation: Our audits of the consolidated financial statements referred to in our report dated December 6, 2000, appearing in the Annual Report on Form 10-K for the year ended October 31, 2000 of CIENA Corporation also included an audit of the financial statement schedule listed in Item 14(a)(2) of this Form 10-K. In our opinion, this financial statement schedule presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. PricewaterhouseCoopers LLP McLean, VA December 6, 2000 2. Exhibits: See Index to Exhibits on page 4 of this Amendment. The Exhibits listed in the accompanying Index to Exhibits are filed or incorporated by reference as part of this report. (b) Reports on Form 8-K No amendment is being made to this item. 3 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. CIENA CORPORATION Date: January 18, 2001 By: /s/ Andrew C. Petrik -------------------- Andrew C. Petrik Vice President, Controller and Treasurer 4 INDEX TO EXHIBITS
Exhibit Number Description ------ ----------- 3.1 (1) Certificate of Amendment to Third Restated Certificate of Incorporation 3.2 (1) Third Restated Certificate of Incorporation 3.3 (1) Amended and Restated Bylaws 3.5 (10) Certificate of Amendment to Third Restated Certificate of Incorporation dated March 23, 1998 3.6 (10) Certificate of Amendment to Third Restated Certificate of Incorporation dated March 16, 2000 4.1 (1) Specimen Stock Certificate 4.2 (3) Rights Agreement dated December 29, 1997 4.3 (4) Amendment to Rights Agreement 4.4 (11) Amendment No. 2 to Rights Agreement dated September 13, 1998 4.5 (4) Amendment No. 3 to Rights Agreement dated October 19, 1998 10.1 (1) Form of Indemnification Agreement for Directors and Officers 10.2 (1) Amended and Restated 1994 Stock Option Plan 10.3 (1) Form of Employee Stock Option Agreements 10.4 (1) 1996 Outside Directors Stock Option Plan 10.5 (1) Forms of 1996 Outside Directors Stock Option Agreement 10.6 (1) Series C Preferred Stock Purchase Agreement dated December 20, 1995 10.7 (1) Lease Agreement dated October 5, 1995 between the Company and CS Corridor-32 Limited Partnership 10.8 (1)(8) Purchase Agreement Between Sprint/United Management Company and the Company dated December 14, 1995 10.9 (1)(8) Basic Purchase Agreement between WorldCom Network Services, Inc. and the Company dated September 19, 1996 10.10 (1) Settlement Agreement and Mutual Release, between the Company and William K. Woodruff & Company, dated August 26, 1996 10.13 (1) Employment Agreement dated April 9, 1994 between the Company and Patrick Nettles 10.14 (1) Lease Agreement dated November 1, 1996 by and between the Company and Aetna Life Insurance Company 10.15 (1) Revolving Note and Business Loan Agreement dated November 25, 1996 between the Company and Mercantile-Safe Deposit & Trust Company 10.16 (1)(8) First Addendum to Procurement Agreement between the Registrant and Sprint/United Management Company dated December 19, 1996 10.17 (5) Third Addendum to Procurement Agreement between the Registrant and Sprint/United Management Company 10.18 (5) Form of Transfer of Control/Severance Agreement 10.19 (6) Lightera 1998 Stock Option Plan and Form of Stock Option Agreement
5 10.18 (5) Form of Transfer of Control/Severance Agreement 10.19 (6) Lightera 1998 Stock Option Plan and Form of Stock Option Agreement 10.20 (7) Omnia Communications, Inc. 1997 stock plan and form of agreements 10.21 (9) Employment Agreement dated August 18, 1999 between the Company and Gary B. Smith 10.22 (9) 1999 Non-Officer Stock Option Plan and Form of Stock Option Agreement 10.23 (9) Lease Agreement dated June 1, 1999 between the Company and Ridgeview Court Associates, L.L.C. 21 (2) Subsidiaries of registrant 23.1 Consent of Independent Accountants (filed herewith) 27.1 (12) Financial Data Schedule
(1) Incorporated by reference from the Company's Registration Statement on Form S-1 (333-17729). (2) Incorporated by reference from the Company's Registration Statement on Form S-1 (333-28525). (3) Incorporated by reference from the Company's Form 8-K dated December 29, 1997. (4) Incorporated by reference from the Company's Form 8-K dated October 14, 1998. (5) Incorporated by reference from the Company's Form 10-K dated December 10, 1998. (6) Incorporated by reference from the Company's Form 10-Q dated May 21, 1999. (7) Incorporated by reference from the Company's Form 10-Q dated August 19, 1999. (8) Confidential treatment has been granted by the Securities and Exchange Commission with respect to certain portions of these exhibits. (9) Incorporated by reference from the Company's Form 10-K dated December 10, 1999. (10) Incorporated by reference from the Company's Form 10-Q dated May 18, 2000. (11) Incorporated by reference from the Company's Form 8-K dated September 14, 1998. (12) Incorporated by reference from the Company's Form 10-K dated December 7, 2000.
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                                                                   EXHIBIT 23.1

                      CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (No. 333-27131, 333-52467, 333-76915, 333-83581,
333-30900), S-3 (No. 333-81133, 333-80375) and S-4 (No.333-53146) of CIENA
Corporation of our reports dated December 6, 2000 relating to the financial
statements and financial statement schedule, which appear in CIENA's Annual
Report on Form 10-K for the year ended October 31, 2000, as amended.


PricewaterhouseCoopers LLP
McLean, VA
January 17, 2001