Dispersion-induced signal distortion in cascaded OADMs

Haiqing Wei; Hwan J. Jeong; Aly F. Elrefaie; David V. Plant

doi:10.1117/12.472897

17 June 2003 Dispersion-induced signal distortion in cascaded OADMs

Haiqing Wei, Hwan J. Jeong, Aly F. Elrefaie, David V. Plant

Proceedings Volume 4989, Optical Devices for Fiber Communication IV; (2003) https://doi.org/10.1117/12.472897
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States

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.

Citation Download Citation

Haiqing Wei, Hwan J. Jeong, Aly F. Elrefaie, and David V. Plant "Dispersion-induced signal distortion in cascaded OADMs", Proc. SPIE 4989, Optical Devices for Fiber Communication IV, (17 June 2003); https://doi.org/10.1117/12.472897

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