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<PAGE> EXHIBIT 16.1 September __, 2000 Securities and Exchange Commission Mail Stop 11-3 450 5th Street, N.W. Washington, D.C. 20549 Dear Sirs/Madams: We have read and agree with the comments (insofar as such comments pertain to us), under the caption "Changes in Independent Auditors" included in this Form S-1 of Tellium, Inc. /s/ ------------------------- DELOITTE & TOUCHE LLP Denver, Colorado September 21, 2000
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