Abstract
The authors present a simple approximate analysis of frequency-shift keying (FSK) coherent optical communications systems and obtain a closed-form estimate of the bit error rate. The inaccuracy of the approximate analysis is about 1 dB. The sensitivity penalty prediction of the approximate analysis is also within 1 dB of the accurate analysis for linewidths up to 100%.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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