Reduction of coherent crosstalk in WDM add/drop multiplexing nodes by bit pattern misalignment

R. Khosravani; M. I. Hayee; B. Hoanca; A. E. Willner

doi:10.1109/68.736420

Reduction of coherent crosstalk in WDM add/drop multiplexing nodes by bit pattern misalignment

R. Khosravani, M. I. Hayee, B. Hoanca, A. E. Willner

Electrical Engineering

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

Coherent crosstalk in wavelength-division-multiplexed (WDM) add/drop multiplexers and switches places severe limitations on the acceptable crosstalk suppression level. We propose and analyze a method of reducing the effects of coherent crosstalk in add-drop multiplexers by purposely introducing fiber delays on the order of bit times between different crosstalk paths. These delays decorrelate the bit pattern of the main signal with the interfering signals and place some of the crosstalk power in the "0" bits of the main signal instead of the "1" bits. For a 16-channel WDM system, this method reduces the device requirement for crosstalk suppression by ∼10 dB for return-to-zero and ∼5 dB for nonreturn-to-zero transmission.

Original language	English (US)
Pages (from-to)	134-136
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	11
Issue number	1
DOIs	https://doi.org/10.1109/68.736420
State	Published - Dec 1 1999

Keywords

Add/drop multiplexer
Coherent crosstalk
Optical interference
Wavelength division multiplexing

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10.1109/68.736420

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