Title :
Limiter-discriminator detection of a coherent optical heterodyne M-ary CPFSK receiver
Author :
Zhang, Xiupu ; Jiang, Peixuan
Author_Institution :
Dept. of Radio Eng., Beijing Univ. of Posts & Telecommun., China
fDate :
8/1/1992 12:00:00 AM
Abstract :
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
Keywords :
discriminators; frequency shift keying; limiters; optical communication equipment; optical modulation; IF beat spectral linewidth; coherent optical heterodyne M-ary CPFSK receiver; continuous-phase frequency-shift-keying; laser phase noise; modulation index; optical signals; signal-to-noise ratio per symbol; symbol error probability; upper bound; Error probability; Frequency; Laser noise; Optical detectors; Optical mixing; Optical modulation; Optical noise; Optical receivers; Phase noise; Signal to noise ratio;
Journal_Title :
Lightwave Technology, Journal of
