Abstract
We revisit the treatment of laser phase noise, with particular application
to coherent and differential phase-shift keyed (PSK) systems, developing a
considerably simplified yet very accurate analysis based on the phase-noise exponent commutation (PNEC)
premise that the receive filtering may be effectively applied in the polar
(angular) domain and treating for the first time arbitrary transmit pulses
(e.g., return to zero) and optical filter responses (still without intersymbol
interference). The PNEC concept directly implies that the angle of the PSK
and differential PSK decision statistic is Gaussian distributed, which is
verified numerically as very accurate, by means of importance-sampling-based
Monte Carlo simulations.
© 2009 IEEE
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