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Sensitivity penalty in multichannel coherent optical communications

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2 Author(s)
Kazovsky, L.G. ; Bell Commun. Res., Red Bank, NJ, USA ; Gimlett, J.L.

The error rates and sensitivity penalties for multichannel coherent optical communications systems are evaluated for amplitude-shift keying (ASK), phase-shift keying (PSK), and frequency-shift keying (FSK) modulation, taking into account adjacent channel interference. Both time-domain and frequency-domain analysis are used, the latter being based on a Gaussian approximation. Both techniques yield similar results for sensitivity penalties below 1 dB. For FSK systems, larger values of the modulation index Δ do not necessarily lead to larger channel spacings. ASK and PSK systems both require larger channel spacings than FSK systems with Δ=1. The study was conducted for sources with linewidths narrow enough so that phase noise does not degrade the performance of receivers with matched filter demodulators

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Lightwave Technology, Journal of  (Volume:6 ,  Issue: 9 )