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

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

Research output: Contribution to journalArticlepeer-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 languageEnglish (US)
Pages (from-to)134-136
Number of pages3
JournalIEEE Photonics Technology Letters
Volume11
Issue number1
DOIs
StatePublished - Dec 1 1999

Keywords

  • Add/drop multiplexer
  • Coherent crosstalk
  • Optical interference
  • Wavelength division multiplexing

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