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The Impact of Crosstalk and Phase Noise in Multichannel Coherent Optical ASK Systems
M. Okan TANRIKULU Ozan K. TONGUZ
IEICE TRANSACTIONS on Communications
Publication Date: 1995/09/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
optical communication, communication theory,
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This paper investigates the effect of crosstalk in multichannel coherent optical ASK systems. A closed-form signal-to-noise ratio (SNR) expression as a function of number of channels, channel separation, laser phase noise, intermediate frequency (IF) filter bandwidth expansion factor (α), system bit rate (Rb=1/T), and additive shot noise is presented. When the desired channel is between two channels in the electrical domain, the minimum permissible electrical domain channel spacing for a 1dB sensitivity penalty due to crosstalk is found to be 4.85Rb when α is optimum; and 8Rb when α=5 for νT=0.30 at BER=10-9. A fairly good agreement is found between the results of this work and those of a previous study.