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Limiter-discriminator detection of a coherent optical heterodyne M-ary CPFSK receiver

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2 Author(s)
Xiupu Zhang ; Dept. of Radio Eng., Beijing Univ. of Posts & Telecommun., China ; Peixuan Jiang

The performance of a coherent optical M-ary continuous-phase frequency-shift-keying (CPFSK) receiver using limiter-discriminator (L-D) detection is investigated. It is shown that L-D detection of CPFSK optical signals offers the best performance for a large normalized IF beat spectral linewidth, ΔνT. When the modulation index is unity, the receiver is immune to laser phase noise and can produce (M/4) exp (-SNR) symbol error probability, which may be considered as the upper bound if the optimal modulation index is used (SNR is the signal-to-noise ratio per symbol). Optimum modulation indexes are 0.8 and 1 at ΔνT=1% and ΔνT=2%, respectively, for M=4, 8, and 16

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Lightwave Technology, Journal of  (Volume:10 ,  Issue: 8 )