Title :
Sensitivity penalty in multichannel coherent optical communications
Author :
Kazovsky, L.G. ; Gimlett, J.L.
Author_Institution :
Bell Commun. Res., Red Bank, NJ, USA
fDate :
9/1/1988 12:00:00 AM
Abstract :
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
Keywords :
amplitude modulation; demodulators; errors; filtering and prediction theory; frequency shift keying; frequency-domain analysis; optical links; phase shift keying; time-domain analysis; amplitude-shift keying; error rates; frequency-domain analysis; frequency-shift keying; matched filter demodulators; modulation index; multichannel coherent optical communications; phase-shift keying; receiver performance; sensitivity penalties; time-domain analysis; Amplitude modulation; Amplitude shift keying; Channel spacing; Error analysis; Frequency modulation; Frequency shift keying; Interchannel interference; Optical fiber communication; Phase modulation; Phase shift keying;
Journal_Title :
Lightwave Technology, Journal of
