Exhibit 99.1



                   Tellium Reports First Quarter 2003 Results

First Quarter Results

o    Cash position of $157.2 million at March 31, 2003; net cash burn was $13.8
     million

o    Revenues of $10.1 million

o    Loss per basic and diluted share on a U.S. GAAP basis was $0.38

o    Loss per basic and diluted share on a pro forma cash basis was $0.09

o    Gross margins on a U.S. GAAP basis were 10%, and 48% on a pro forma basis

OCEANPORT, N.J., April 30, 2003 - Tellium, Inc. (Nasdaq: TELM), today reported
its results for the first quarter ended March 31, 2003. On a U.S. GAAP basis,
the company's net loss for the first quarter was approximately $37.4 million, or
a loss of $0.38 per basic and diluted share. For the fourth quarter 2002, on a
U.S. GAAP basis, the company's net loss was approximately $56.5 million, or a
loss of $0.57 per basic and diluted share.

Excluding non-cash charges related to equity issuances, stock-based compensation
expense, amortization, restructuring charges and impairment of long-lived
assets, Tellium's pro forma net loss for the first quarter ended March 31, 2003
was approximately $8.6 million, or a loss of $0.09 per basic and diluted share,
compared to a pro forma net loss of approximately $17.2 million, or $0.17 per
basic and diluted share, during the fourth quarter of 2002. As of January 1,
2003, Tellium's pro forma results now include depreciation expense. For
consistency, Tellium adjusted its pro forma net loss for the fourth quarter of
2002 to include depreciation expense. A reconciliation of net loss on a U.S.
GAAP basis and on a pro forma basis is provided in a table immediately following
the Pro Forma Consolidated Statement of Operations.

Revenues were approximately $10.1 million during the first quarter of 2003,
compared with approximately $2.9 million in the fourth quarter of 2002. For the
quarter ended March 31, 2003, gross profit on a U.S. GAAP basis was
approximately $1.1 million, resulting in a gross margin of 10%. On a pro forma
basis, gross profit was approximately $4.9 million, resulting in a gross margin
of 48%. A reconciliation of gross profits and gross margins on a U.S. GAAP basis
and on a pro forma basis is provided in a table immediately following the Pro
Forma Consolidated Statement of Operations.

Tellium ended the first quarter of 2003 with approximately $157.2 million of
cash on hand, which reflects a reduction in cash of approximately $13.8 million
during the quarter. Tellium's reduction in cash was approximately $1.2 million
less than the $15.0 million cash-burn that the company had projected in its
earnings call on January 29, 2003.

Effective January 1, 2003, Tellium adopted SFAS No. 123, Accounting for
Stock-Based Compensation. Tellium selected the prospective method of adoption
described in SFAS No. 148, Accounting for Stock-Based Compensation Transition
Disclosure. The application of SFAS No. 123 resulted in a non-cash charge of
$18.4 million, which is included in stock-based compensation expense for the
quarter ended March 31, 2003.

As a result of its business restructuring announced in January 2003, Tellium
recorded a restructuring charge of approximately $6.7 million in the quarter
ended March 31, 2003 associated with a workforce reduction and the consolidation
of corporate facilities. This restructuring charge is included in the $7.4
million in charges related to restructuring and the impairment of long-lived
assets.

"Through our aggressive actions to reduce operating costs, I believe we have
achieved the first phase of our strategy - stability. Now, we are squarely
focused on attaining growth and ultimately profitability," said Harry Carr,
chairman of the board and chief executive officer of Tellium. "We are starting
2003 on the right note. We met or exceeded the guidance we provided in January,
and our Aurora switches are in the process of



being deployed in Cable & Wireless' global network. I am very proud of what the
Tellium team has done to meet the challenges in this very difficult environment.
I believe that we are well positioned for success."

Live Webcast Discussing First Quarter 2003 Results

Tellium management will discuss the company's first quarter results with
investors and analysts on Wednesday, April 30, 2003, at 5:00 p.m. EDT. A live
audio webcast of this discussion will be available via Tellium's home page at
www.tellium.com. A replay of the webcast will be available for approximately two
weeks on the Investor Relations page of Tellium's web site at
investor.tellium.com.

About Tellium

Tellium delivers high-speed, high-capacity, intelligent core optical solutions
that empower service providers around the world to create, run, control and
optimize their networks. First in the world to provide in-service, intelligent
optical switches, Tellium's Aurora(TM) Optical Switch(TM) family and the StarNet
Software Suite together offer service providers a simple and cost-effective
migration path to next-generation public networks.

For more information, visit Tellium's web site at www.tellium.com, or contact:

Investors
Jenniffer Collins
Tel:  +1 732-483-3112
Email:  JCollins@tellium.com

Media
Mike Deshaies
Tel:  +1 732-923-4160
Email:  mdeshaies@tellium.com

Certain matters discussed in this press release are "forward-looking statements"
within the meaning of Section 27A of the Securities Act of 1933 and Section 21E
of the Securities Exchange Act of 1934. These forward-looking statements are
based on current expectations, forecasts and assumptions of the company that
involve risks and uncertainties. Forward-looking statements in this release
include, but are not limited to, our ability to grow our business and become
profitable, our expectation that Cable & Wireless will deploy our Aurora
switches in its global network and purchase additional Aurora switches from us,
our belief that we are well positioned for success, our ability to deliver
better, faster and more cost-effective products to the marketplace, and all
other statements that are not purely historical. These forward-looking
statements involve risks and uncertainties which could cause actual results to
differ materially including, without limitation, the risk that (1) we continue
to incur significant losses in the future; (2) our limited operating history
makes forecasting our future revenues and operating results difficult, which
impairs our ability to manage our business; (3) we generate substantially all of
our revenue from a limited number of customers; (4) we will not attract new
customers; (5) customers fail to place orders for our products; (6) we are
unable to reach commercially-acceptable contract terms with new customers; (7)
our revenues and operating results vary significantly from quarter to quarter,
causing the price of our common stock to decline; (8) the selling prices of our
products declines; (9) significant non-cash charges will affect our future
operating results, causing the price of our common stock to decline; (10)
general economic conditions or conditions within our industry continue to worsen
or improve more slowly than we expect; (11) we experience volatility in our
stock price; (12) errors or defects in our products are found only after full
deployment in a customer's network; (13) our products are unable to operate
within customer networks; (14) our products fail to meet contract specifications
or industry standards that may emerge; (15) the optical switching market fails
to develop as we expect; (16) we fail to develop new and enhanced products; (17)
we are unable to increase market awareness and sales of our products; (18) we
are unable to comply with government regulation; (19) any disruption in our
manufacturing relationships causes us to fail to meet customers' demands; and
(20) industry conditions and our workforce reductions impact product development
and existing customer contracts.

These and other factors and other risks and uncertainties are discussed in the
company's filings with the Securities and Exchange Commission, particularly the
"Risk Factors" section of our annual and quarterly reports. The forward-looking
statements in this press release are only made as of this date, and the company
assumes no obligation to update the information included in this press release,
whether as a result of new information, future events or otherwise.

Tellium, the Tellium logo, "Smarter, Faster Optical Networks", Aurora Optical
Switch, StarNet Software Suite, and others are trademarks or registered
trademarks of Tellium, Inc. in the United States and/or other countries. Other
marks are the properties of their respective owners.





                    Tellium, Inc. Consolidated Balance Sheet
                             (amounts in thousands)



As of:                                                           12/31/2002          03/31/2003
                                                                 ------------       -------------
ASSETS                                                            (audited)          (unaudited)
CURRENT ASSETS:
                                                                            
     Cash and cash equivalents                                   $   171,019        $    157,178
     Accounts receivable, less allowance for doubtful accounts            13              10,070
     Inventories                                                      13,745              13,653
     Prepaid expenses and other current assets                         2,290               1,512
                                                                 ------------       -------------
     Total current assets                                            187,067             182,413
Property and equipment - net                                          40,533              33,843
Other assets                                                             754                 760
                                                                 ------------       -------------
TOTAL ASSETS                                                     $   228,354        $    217,016
                                                                 ============       =============

LIABILITIES, PREFERRED STOCK, AND
     STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
     Trade accounts payable                                      $     2,978        $      3,971
     Accrued expenses and other current liabilities                   21,923              25,519
     Current portion of notes payable                                      -                 540
     Current portion of capital lease obligations                         73                  74
     Bank line of credit                                               8,000               8,000
                                                                 ------------       -------------
     Total current liabilities                                        32,974              38,104

Long-term portion of notes payable                                       540                   -
Long-term portion of capital lease obligations                            52                  33
Other long-term liabilities                                              376                 277
                                                                 ------------       -------------
TOTAL LIABILITIES                                                     33,942              38,414
                                                                 ------------       -------------
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
     Common stock, $0.001 par value, 900,000 shares authorized,
       116,494 issued and 114,044 legally outstanding as of
       12/31/02 116,828 issued and 114,378 legally outstanding
       as of 3/31/03                                                     116                 117
     Additional paid-in capital                                    1,008,592           1,022,667
     Accumulated deficit                                            (779,932)           (817,376)
     Deferred employee compensation                                  (20,424)            (12,866)
     Common stock in treasury, at cost                               (13,940)            (13,940)
                                                                 ------------       -------------
     Total stockholders' equity                                      194,412             178,602
                                                                 ------------       -------------
TOTAL LIABILITIES AND
     STOCKHOLDERS' EQUITY                                        $   228,354        $    217,016
                                                                 ============       =============







           Tellium, Inc. Reported Consolidated Statement of Operations
                  (amounts in thousands except per share data)


                                                                      Three months ended
                                                                  03/31/2002      12/31/2002       03/31/2003
                                                                  (unaudited)    (unaudited)       (unaudited)

                                                                                     
REVENUE                                                         $    54,060   $       2,892   $       10,118
    Non-cash charges relating to equity issuances                     7,356          29,053                -
                                                                  ----------    ------------    -------------
REVENUE, net of non-cash charges relating to equity issuances        46,704         (26,161)          10,118

COST OF REVENUE                                                      31,246           5,573            9,063
                                                                  ----------    ------------    -------------

Gross profit                                                         15,458         (31,734)           1,055
                                                                  ----------    ------------    -------------

OPERATING EXPENSES:
    Research and devlopment, excluding stock based compensation      13,966           6,523            5,709
    Sales and marketing, excluding stock based compensation           7,155           1,802            2,199
    General and administrative, excluding stock based compensation    7,619           7,669            6,045
    Amortization of intangible assets                                 4,050             136                -
    Stock-based compensation expense                                 11,987           2,421           17,632
    Restructuring and impairment of long-lived assets                     -           7,096            7,392
                                                                  ----------    ------------    -------------

    Total operating expenses                                         44,777          25,647           38,977
                                                                  ----------    ------------    -------------

OPERATING LOSS                                                      (29,319)        (57,381)         (37,922)
                                                                  ----------    ------------    -------------

OTHER  (EXPENSE) INCOME:
    Other (expense) income                                              (56)            232               10
    Interest income - net                                               858             616              468
                                                                  ----------    ------------    -------------

    Total other income                                                  802             848              478
                                                                  ----------    ------------    -------------

NET LOSS                                                        $   (28,517)  $     (56,533)  $      (37,444)
                                                                  ==========    ============    =============


BASIC AND DILUTED LOSS PER SHARE1                               $     (0.27) $        (0.57) $         (0.38)
                                                                  ==========    ============    =============
                                                                                               $


BASIC AND DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING1              106,911          98,667           98,738
                                                                  ==========    ============    =============


STOCK-BASED COMPENSATION EXPENSE
    Cost of revenue                                             $       1,453  $          678  $         3,851
    Research and development                                            7,520             571            3,113
    Sales and marketing                                                 2,935           1,065            7,046
    General and administrative                                          1,532             785            7,473
                                                                  ------------    ------------    -------------

    Total stock-based compensation expense                      $      13,440  $        3,099  $        21,483
                                                                  ============    ============    =============

DEPRECIATION

    Cost of revenue                                             $       1,881  $        2,327  $         2,279
    Research and development                                            1,206           1,479            1,252
    Sales and marketing                                                   304              43               44
    General and administrative                                          2,131           1,779            1,461
                                                                  ------------    ------------    -------------

    Total depreciation                                          $       5,522  $        5,628  $         5,036
                                                                  ============    ============    =============


Notes

1    Reflects number of shares calculated pursuant to generally accepted
     accounting principles, which excludes approximately 10,680,995 vested
     shares of restricted stock transferred to treasury stock on July 26, 2002
     pursuant to EITF Issue No. 00-23.



          Tellium, Inc. Pro Forma Consolidated Statement of Operations1
                  (amounts in thousands, except per share data)



                                                              Three months ended
                                                 03/31/2002       12/31/2002        03/31/2003
                                                 (unaudited)      (unaudited)       (unaudited)

                                                                         
REVENUE                                        $       54,060   $         2,892   $       10,118

COST OF REVENUE                                        29,793             4,895            5,212
                                                --------------  ----------------   --------------

Gross profit                                           24,267           (2,003)            4,906
                                                --------------  ----------------   --------------

OPERATING EXPENSES:
        Research and development                       13,966             6,523            5,709
        Sales and marketing                             7,155             1,802            2,199
        General and administrative                      7,619             7,669            6,045
                                                --------------  ----------------   --------------

        Total operating expenses                       28,740            15,994           13,953
                                                --------------  ----------------   --------------

OPERATING LOSS                                         (4,473)          (17,997)          (9,047)
                                                --------------  ----------------   --------------

OTHER INCOME:
        Other (expense ) income                           (56)              232               10
        Interest income -net                              858               616              468
                                                --------------  ----------------   --------------

        Total other income                                802               848              478
                                                --------------  ----------------   --------------

NET LOSS                                       $       (3,671)  $       (17,149)   $      (8,569)
                                                ==============  ================   ==============

BASIC AND DILUTED EARNINGS/(LOSS)
PER SHARE2                                     $        (0.03)  $         (0.17)   $       (0.09)

BASIC AND DILUTED WEIGHTED
AVERAGE SHARES OUTSTANDING2                           106,911            98,667           98,738



Notes
- -----

1    All financial results reported in the Consolidated Statement of Operations
     excludes non-cash items including charges relating to equity issuances,
     stock-based compensation expense, and amortization, restructuring charges,
     and impairment of long-lived assets. A reconciliation of the non-GAAP
     measures to the most directly comparable GAAP measures is contained on the
     following page.

2    Reflects number of shares calculated pursuant to generally accepted
     accounting principles, which excludes approximately 10,680,995 vested
     shares of restricted stock transferred to treasury stock on July 26, 2002
     pursuant to EITF Issue No. 00-23.



          Tellium, Inc. Reconciliation U.S. GAAP Financial Measures to
                          Non-GAAP Financial Measures
                             (amounts in thousands)


                                                                      Three months ended
                                                         03/31/2002       12/31/2002      03/31/2003
                                                         (unaudited)     (unaudited)     (unaudited)

                                                                              
NET LOSS - AS REPORTED                                 $     (28,517)   $    (56,533)  $      (37,444)
                                                        ==============   =============  ===============

NON CASH CHARGES

      Non-cash charges relating to equity issuances             7,356          29,053
                                                                                                     -
      Amortization of intangible assets                         4,050             136
                                                                                                     -
      Stock-based compensation expense                         13,440           3,099           21,483
      Restructuring and impairment of long-lived                                7,096
      assets                                                        -                            7,392
                                                        --------------   -------------  ---------------

      Total non cash charges                                   24,846          39,384           28,875
                                                        --------------   -------------  ---------------

NET LOSS - PRO FORMA1                                  $      (3,671)   $    (17,149)  $       (8,569)
                                                        ==============   =============  ===============

GROSS PROFIT  - AS REPORTED                            $       15,458   $    (31,734)  $         1,055
Gross margins as a percentage of revenue- as                      29%          -1097%              10%
reported

                                                        ==============   =============  ===============

NON CASH CHARGES

      Non-cash charges relating to equity issuances             7,356          29,053
                                                                                                     -
      Stock-based compensation expense                          1,453             678            3,851
                                                        --------------   -------------  ---------------

      Total non cash charges                                    8,809          29,731            3,851
                                                        --------------   -------------  ---------------

GROSS PROFIT - PRO FORMA                               $       24,267   $     (2,003)  $         4,906
Pro forma gross margins as a percentage of revenue                45%            -69%              48%
                                                        ==============   =============  ===============


                                    * * * * *

The pro forma financial statements report non-GAAP financial measures that
exclude the impact of non-cash charges related to equity issuance and
stock-based compensation, amortization of intangible assets and the charges
associated with the restructuring and impairment of long-lived assets. Tellium's
management believes that non-GAAP measures, presented with the U.S. GAAP
financial measures, provide useful information to investors because they assist
investors in better understanding the company's liquidity and cash position
which enables them to better assess the company's quarterly operations. In
addition, since we have historically reported non-GAAP results to the investment
community, we believe the inclusion of non-GAAP numbers provides consistency in
our financial reporting. Tellium's management recognizes that non-GAAP results
are not a substitute for U.S. GAAP measures. However, the non-GAAP results are a
helpful tool in assisting Tellium's management to better understand and manage
its business. Tellium's management uses the non-GAAP financial measures as an
alternative means for assessing quarterly operations results and projecting the
ongoing costs of operations.

Notes
- -----

1    As discussed above, pro forma net loss of approximately $11.5 million was
     originally reported for the three months ended December 31, 2002. These pro
     forma results excluded depreciation charges of approximately $5.6 million.
     As of January 1, 2003, we no longer exclude depreciation expense from our
     pro forma results. The pro forma loss of approximately $17.2 million in the
     presentation above has been revised to provide a comparison on a consistent
     basis.

                                       ###