SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K
                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



                                 August 19, 2004
                Date of Report (Date of earliest event reported)



                                CIENA Corporation
             (Exact name of registrant as specified in its charter)


          Delaware                    0-21969                  23-2725311
(State or other jurisdiction   (Commission File No.)         (IRS Employer
     of incorporation)                                     Identification No.)


                 1201 Winterson Road, Linthicum, Maryland 21090
               (Address of principal executive offices) (Zip Code)



               Registrant's telephone number, including area code:
                                 (410) 865-8500



                                 Not applicable
          (Former name or former address, if changed since last report)


                             Exhibit Index on Page 2



The information in this Report, including the exhibit, is furnished under Item 12 of Form 8-K and, pursuant to General Instruction B.6. thereunder, is not "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934. Furthermore, the information in this Report, including the exhibit, is not incorporated by reference into the filings of the registrant under the Securities Act of 1933. ITEM 12 -- RESULTS OF OPERATIONS AND FINANCIAL CONDITION On August 19, 2004, CIENA Corporation issued a press release announcing its financial results for the fiscal quarter ended July 31, 2004. The text of the press release is furnished as Exhibit 99.1 to this Report. EXHIBIT INDEX Exhibit Number Description of Document - -------------- ----------------------- Exhibit 99.1 Text of Press Release dated August 19, 2004, issued by CIENA Corporation, reporting its results of operations for the third quarter of fiscal 2004. -2-

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 Dated: August 19, 2004 By: /s/ Russell B. Stevenson, Jr. ---------------------------------------------- Senior Vice President, General Counsel and Secretary -3-

                                                                    Exhibit 99.1

               CIENA Reports Third Quarter 2004 Results

    LINTHICUM, Md.--(BUSINESS WIRE)--Aug. 19, 2004--CIENA(R)
Corporation (NASDAQ:CIEN), a leading global provider of intelligent
service creation and delivery solutions, today reported its third
fiscal quarter results for the period ending July 31, 2004. Consistent
with information in the Company's preliminary results announcement of
August 3, 2004, revenue for the quarter totaled $75.6 million,
representing a 1.2% sequential increase, and an increase of 10.4% for
the same period a year ago. On a generally accepted accounting
principles (GAAP) basis, CIENA's reported net loss for the quarter was
$141.5 million, or a net loss of $0.25 per share.
    "More than a year ago CIENA embarked toward a goal of
significantly diversifying our product portfolio, and our business,"
said Gary Smith, CIENA's president and CEO. "As a result of strategic
acquisitions, partnerships and internal development efforts, we now
participate in new data and service delivery markets, targeting
high-value applications such as DSL, Fiber-to-the-X, storage
extension, and the triple-play of voice, video and data. In fact,
revenue from these new opportunities represented more than 35% of
total revenue in the third quarter.
    "We have taken a number of important steps toward restoring health
and profitability to our business, and over the next several quarters,
our focus and execution will be crucial for success," said Smith.
    CIENA's Board of Directors affirmed its support of the Company's
strategy.
    "CIENA is pursuing a complex, long-term strategy in an
unpredictable and dynamic market," said H. Berry Cash, lead
independent director for CIENA. "The Company has substantially
expanded its addressable markets while simultaneously implementing
significant cost reductions and operating changes. The Board is
confident these actions represent the best long-term interests of the
Company's shareholders and will lead to a return to profitability and
improved shareholder value."
    Separately today, CIENA announced that Michael J. Rowny, chairman
of Rowny Capital and former president and CEO of MCI's International
Ventures, Alliances and Correspondent group, has joined CIENA's board
of directors as its tenth member and eighth independent director.

    Non-GAAP Presentation

    In evaluating the operating performance of its business, CIENA's
management excludes certain charges or credits that are required by
GAAP. These items, which are identified in the table below, share one
or more of the following characteristics: they are unusual, and CIENA
does not expect them to recur in the ordinary course of its business;
they do not involve the expenditure of cash; they are unrelated to the
ongoing operation of the business in the ordinary course; or their
magnitude and timing is largely outside of the Company's control.


                                         Quarter Ended  9 Months Ended
                                         -------------- --------------
                                         July 31, 2004  July 31, 2004
                                         -------------- --------------
Item                                     (in thousands) (in thousands)
- ---------------------------------------- -------------- --------------
Stock compensation costs                    $    3,953     $    8,699
Amortization of intangible assets               12,667         19,458
In-process research and development             30,200         30,200
Accelerated amortization of leasehold
 improvements                                   12,504         14,153
Restructuring costs                             13,547         22,125
Long-lived asset impairments                     7,217          7,217
Recovery of sales, export, use tax
 liabilities & payments                         (3,457)        (5,388)
Recovery of doubtful accounts, net                   -         (2,794)
(Gain)/loss on equity investments, net             200           (393)
Loss on extinguishment of debt                       -          8,216
Income tax benefit on adjusted net loss         22,756         68,193
                                         -------------- --------------
                       Total Adjustments    $   99,587     $  169,686
                                         ============== ==============
GAAP Net Loss                               $ (141,467)    $ (294,391)
Adjusted for items above                        99,587        169,686
                                         -------------- --------------
                                            $  (41,880)    $ (124,705)
Non GAAP Net Loss
                                         -------------- --------------
Non GAAP Net Loss per Share                 $    (0.07)    $    (0.25)
                                         ============== ==============

    Please see Appendix A for additional information about this table.


    These adjustments are not in accordance with GAAP, and making
these adjustments may not permit meaningful comparisons to other
companies.
    As of the quarter ended July 31, 2004, CIENA's weighted average
shares outstanding were approximately 566,234,000. Adjusting CIENA's
quarterly GAAP results as noted would reduce the Company's net loss in
its third fiscal quarter to $0.07 per share.
    For the nine months ended July 31, 2004, CIENA's weighted average
shares outstanding were approximately 504,812,000. Adjusting CIENA's
nine-month GAAP results as noted would reduce the Company's net loss
for the period to $0.25 per share.

    Third Quarter 2004 Highlights

    --  Successfully completed the acquisitions and the operational
        integration of both Catena Networks and Internet Photonics.

    --  Improved gross margin from 11.0% in the fiscal second quarter
        to 24.9% in the third quarter.

    --  Delivered lower-than-anticipated ongoing operating expenses,
        overachieving cost-reduction targets in the quarter by
        approximately $10 million.

    --  Secured three new customers for the new CN 1000
        next-generation broadband access platform and agreed to
        product trials with a regional Bell operating company (RBOC).

    --  Recognized initial revenue from Verizon for DN 7000 series
        multiservice edge switching deployments.

    --  Ended the quarter with cash and short- and long-term
        investments valued at $1.36 billion.

    Third Quarter Product and Application Developments

    CIENA made several new data and access-focused product and feature
announcements during the quarter, including:

    --  Introduced the CNX-100(TM) Modular Broadband Loop Carrier
        designed to broadband-enable an estimated 30 million POTS-only
        access lines.

    --  Introduced a new integrated, 10-Gigabit add/drop multiplexer
        (ADM) for the ONLINE Metro(TM) multiservice DWDM optical
        transport platform, driving down the cost of high-bandwidth
        metro, enterprise and multiservice networks.

    --  Announced the CN 2600(TM) Multiservice Edge Aggregator, an
        edge-optimized platform to deliver low- and high-bandwidth TDM
        and Ethernet services for remote terminals, multi-tenant units
        and central offices.

    --  Announced CoreDirector(R) services gateway solutions for metro
        data networking and IP/MPLS core convergence, expanding
        CoreDirector's capabilities into Layer 2 applications with
        Ethernet interfaces and packet-aware intelligence.

    --  Introduced integrated Layer 2 packet switching to intelligent
        metro access and transport solutions to drive
        revenue-generating services for cable operators and service
        providers.

    --  Demonstrated the world's first ultra long-haul optical
        transport connection at 40 Gigabits per second (Gbps) with MCI
        and Mintera to facilitate the roll-out of next-generation
        IP-based services on MCI's existing 10 Gbps backbone.

    --  Participated in a 40 Gbps trial on Sprint's production IP
        network between San Jose and Stockton, Calif., utilizing
        CIENA's dense wave division multiplexing technology.

    Business Outlook

    "As a result of our broader product portfolio, we are engaged in
significantly more customer interactions and are confident that those
interactions will translate into opportunities longer-term," said
Smith. "Short term, we expect revenue for our fourth fiscal quarter
will be roughly flat with our third fiscal quarter revenue, reflecting
ongoing customer uncertainty and caution."

    Live Web Broadcast of Third Quarter Results

    CIENA will host a discussion of this morning's announcements with
investors and financial analysts today, Thursday, August 19, 2004 at
8:30 a.m. (Eastern). The live broadcast of the discussion will be
available via CIENA's homepage at www.CIENA.com. An archived version
of the discussion will be available shortly following the conclusion
of the live broadcast on the Investor Relations page of CIENA's
website at: www.CIENA.com/investors.

    NOTE TO INVESTORS

    This press release contains certain forward-looking statements
based on current expectations, forecasts and assumptions that involve
risks and uncertainties. These statements are based on information
available to the Company as of the date hereof; and CIENA's actual
results could differ materially from those stated or implied, due to
risks and uncertainties associated with its business, which include
the risk factors disclosed in its Report on Form 10-Q, which CIENA
filed with the Securities and Exchange Commission on May 20, 2004.
Forward-looking statements include statements regarding CIENA's
expectations, beliefs, intentions or strategies regarding the future
and can be identified by forward-looking words such as "anticipate,"
"believe," "could," "estimate," "expect," "intend," "may," "should,"
"will," and "would" or similar words. Forward-looking statements in
this release include: The Board is confident these actions represent
the best long-term interests of the Company's shareholders and will
lead to a return to profitability and improved shareholder value; as a
result of our broader product portfolio, we are engaged in
significantly more customer interactions and are confident that those
interactions will translate into opportunities longer-term; and, short
term, we expect revenue for our fourth fiscal quarter will be roughly
flat with our third fiscal quarter revenue, reflecting ongoing
customer uncertainty and caution. CIENA assumes no obligation to
update the information included in this press release, whether as a
result of new information, future events or otherwise.



                           CIENA CORPORATION
                 CONSOLIDATED STATEMENTS OF OPERATIONS
                 (in thousands, except per share data)
                              (unaudited)

                               Quarter Ended       Nine Months Ended
                            -------------------- ---------------------
                            July 31,   July 31,   July 31,   July 31,
                              2003       2004       2003       2004
                            --------- ---------- ---------- ----------
Revenues:
   Products                 $ 59,294  $  64,340  $ 183,914  $ 181,436
   Services                    9,184     11,249     28,578     35,266
                            --------- ---------- ---------- ----------
Total revenue                 68,478     75,589    212,492    216,702
Costs:
   Products                   39,194     48,069    119,177    138,918
   Services                   12,749      8,723     42,300     30,212
                            --------- ---------- ---------- ----------
Total cost of goods sold      51,943     56,792    161,477    169,130
                            --------- ---------- ---------- ----------
  Gross profit                16,535     18,797     51,015     47,572
Operating expenses:         --------- ---------- ---------- ----------
   Research and development
    (exclusive of stock
    compensation costs below) 47,963     57,762    153,890    151,418
   Selling and marketing
    (exclusive of stock
    compensation costs below) 24,536     29,468     76,804     80,011
   General and
    administrative
    (exclusive of stock
    compensation costs
    below)                     7,969      6,969     30,741     20,052
   Stock compensation
    costs:
       Research and
        development            2,932      1,860     10,136      5,473
       Selling and
        marketing                687      1,214      2,122      2,147
       General and
        administrative           312        879      1,032      1,079
   Amortization of
    intangible assets          4,479     12,667     11,454     19,458
   In-process research and
    development                1,500     30,200      1,500     30,200
   Restructuring costs        15,527     13,547     18,251     22,125
   Long-lived asset
    impairments                    -      7,217          -      7,217
   Recovery of sale, export,
    use tax liabilities and
    payments                       -     (3,457)         -     (5,388)
   Recovery of doubtful
    accounts, net                  -          -          -     (2,794)
     Total operating        --------- ---------- ---------- ----------
      expenses               105,905    158,326    305,930    330,998
                            --------- ---------- ---------- ----------

Loss from operations         (89,370)  (139,529)  (254,915)  (283,426)

Interest and other income,
 net                           8,865      4,936     33,297     18,228

Interest expense              (8,070)    (6,469)   (28,334)   (20,326)

Gain (loss) on equity
 investments, net                  -       (200)       (10)       393

Loss on extinguishment of
 debt                              -          -    (20,606)    (8,216)
                            --------- ---------- ---------- ----------

Loss before income taxes     (88,575)  (141,262)  (270,568)  (293,347)

Provision for income taxes       299        205        909      1,044
                            --------- ---------- ---------- ----------

Net loss                    $(88,874) $(141,467) $(271,477) $(294,391)
                            ========= ========== ========== ==========
Basic and diluted net loss
 per common share and
 dilutive potential common
 share                      $  (0.20) $   (0.25) $   (0.62) $   (0.58)
                            ========= ========== ========== ==========
Weighted average basic
 common and dilutive
 potential common shares
 outstanding                 451,009    566,234    438,133    504,812
                            ========= ========== ========== ==========


                          CIENA CORPORATION
                     CONSOLIDATED BALANCE SHEETS
                  (in thousands, except share data)
                             (unaudited)

                                              October 31,   July 31,
                                                 2003         2004
                                             ------------ ------------
                   ASSETS
Current assets:
   Cash and cash equivalents                 $   309,665  $   255,730
   Short-term investments                        796,809      358,369
   Accounts receivable, net                       43,600       49,821
   Inventories, net                               44,995       49,836
   Prepaid expenses and other                     34,334       29,663
                                             ------------ ------------
     Total current assets                      1,229,403      743,419
Long-term investments                            519,744      732,967
Equipment, furniture and fixtures, net           114,930       77,499
Goodwill                                         336,039      780,875
Other intangible assets, net                     108,408      210,762
Other long-term assets                            69,641       67,924
                                             ------------ ------------
   Total assets                              $ 2,378,165  $ 2,613,446
                                             ============ ============

    LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                          $    44,402  $    35,570
   Accrued liabilities                            98,926       81,505
   Restructuring liabilities                      14,378       13,718
   Unfavorable lease commitments                   9,380        9,857
   Income taxes payable                            4,640        5,609
   Deferred revenue                               14,473       17,525
                                             ------------ ------------
     Total current liabilities                   186,199      163,784
Long-term deferred revenue                        14,547       16,730
Long-term restructuring liabilities               52,164       43,831
Long-term unfavorable lease commitments           61,312       53,903
Other long-term obligations                        2,698        2,826
Convertible notes payable                        730,428      690,000
                                             ------------ ------------
     Total liabilities                         1,047,348      971,074
                                             ------------ ------------
Commitments and contingencies
Stockholders' equity:
  Preferred stock - par value $0.01;
   20,000,000 shares authorized; zero shares
   issued and outstanding                              -            -
  Common stock - par value $0.01; 980,000,000
   shares authorized; 473,214,856 and
   568,890,725 shares issued and outstanding       4,732        5,689
  Additional paid-in capital                   4,861,182    5,479,672
  Deferred stock compensation                     (9,664)     (17,204)
  Notes receivable from stockholders                (448)        (401)
  Accumulated other comprehensive income
   (loss)                                          2,447       (3,561)
  Accumulated deficit                         (3,527,432)  (3,821,823)
                                             ------------ ------------
     Total stockholders' equity                1,330,817    1,642,372
                                             ------------ ------------
  Total liabilities and stockholders' equity $ 2,378,165  $ 2,613,446
                                             ============ ============


    Appendix A

    The adjustments management makes in analyzing CIENA's third
quarter fiscal 2004 GAAP results are as follows:

    --  Stock compensation costs - a non-cash expense largely
        unrelated to normal operations, and which arises under GAAP
        accounting from the assumption of unvested stock options
        issued by any companies we acquire.

    --  Amortization of intangible assets - a non-cash expense
        unrelated to normal operations arising from acquisitions of
        intangible assets, principally developed technology, which
        CIENA is required to amortize over its expected useful life.

    --  In-process research and development - a non-recurring expense
        related to in-process technology that, as of the date of
        acquisition, has not reached technological feasibility and has
        no alternative future use.

    --  Accelerated amortization of leasehold improvements - a
        non-cash expense related to the planned closing of our San
        Jose, California facility.
    --  Restructuring costs - non-recurring charges, unrelated to
        normal operations, incurred as the result of reducing the size
        of the Company's operations to align its resources with the
        reduced size of the telecommunications market as well as the
        result of targeting new segment opportunities within the
        overall market.

    --  Long-lived asset impairments - non-recurring charges,
        unrelated to normal operations, incurred as a result of excess
        equipment classified as held for sale.

    --  Recovery of sales, export and use tax liabilities and payments
        - a non-recurring gain unrelated to normal operations

    --  Recovery of doubtful accounts, net - a non-recurring gain
        unrelated to normal operations due to payment received from a
        customer from which payment was previously deemed doubtful due
        to the customer's financial condition.

    --  Gain (loss) on equity investments, net - a non-recurring gain
        or loss unrelated to normal operations.

    --  Loss on extinguishment of debt - a non-recurring expense,
        unrelated to normal operations.

    --  Income tax benefit on adjusted net loss - the income tax
        charge or benefit on the adjusted net loss, which is a
        necessary adjustment for consistency. The Company currently
        has a full valuation allowance for GAAP reporting purposes and
        accordingly does not recognize a tax benefit for losses
        generated.

    ABOUT CIENA

    CIENA Corporation delivers innovative network solutions to the
world's largest service providers, cable operators and enterprises,
increasing the cost-efficiency of current services while enabling the
creation of new carrier-class data services built upon the existing
network infrastructure. Additional information about CIENA can be
found at www.ciena.com.


    CONTACT: CIENA Corporation
             Investor Contacts:
             Suzanne DuLong or Jessica Towns
             (888) 243-6223
             email: ir@ciena.com
                 or
             Press Contacts:
             Aaron Graham or Nicole Anderson
             (877) 857-7377
             email: pr@ciena.com