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Proceedings Paper

Dispersion-induced signal distortion in cascaded OADMs
Author(s): Haiqing Wei; Hwan J. Jeong; Aly F. Elrefaie; David V. Plant
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Paper Abstract

The optical add/drop multiplexer (OADM) is an important device in modern optical networks. Optical filters in OADMs often introduce group-velocity dispersion (GVD) and/or slope of GVD, the accumulation of which could distort the signals significantly. A computer model is built for commercial filters, accounting for the filtering gain and dispersion characteristics. When the model is incorporated into a network simulator, the filter dispersion is found to severely limit the number of OADMs that may be cascaded when transmitting 40Gb/s WDM signals with a channel spacing of 100GHz. As such high spectral efficiency difficult to achieve, the next considerations would be to transmit 40Gb/s over 200GHz channel spacing, or 10Gb/s over 50GHz channel spacing. The dispersion problem is mitigated, but still an un-negligible factor of limitation. For a large OADM network size, low-dispersion filters should be used, or a proper dispersion compensator is needed to offset the filter dispersion.

Paper Details

Date Published: 17 June 2003
PDF: 6 pages
Proc. SPIE 4989, Optical Devices for Fiber Communication IV, (17 June 2003); doi: 10.1117/12.472897
Show Author Affiliations
Haiqing Wei, Gazillion Bits Inc. (United States)
McGill Univ. (Canada)
Hwan J. Jeong, Gazillion Bits Inc. (United States)
Aly F. Elrefaie, Gazillion Bits Inc. (United States)
David V. Plant, McGill Univ. (Canada)


Published in SPIE Proceedings Vol. 4989:
Optical Devices for Fiber Communication IV
Michel J. F. Digonnet, Editor(s)

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