Laser Phase Noise in Coherent and Differential Optical Transmission Revisited in the Polar Domain

• Published in: Journal of lightwave technology Vol. 27; no. 1; pp. 19 - 29
• Main Authors: Atzmon, Y., Nazarathy, M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-01-2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Coherence; Coherent transmission; Computer simulation; Detection, estimation, filtering, equalization, prediction; differential phase-shift keying (DPSK); Exact sciences and technology; Fiber nonlinear optics; Filtering; Gaussian; High speed optical techniques; Information, signal and communications theory; laser linewidth; Laser noise; Lasers; Modulation, demodulation; Monte Carlo methods; Noise; Nonlinear optics; Optical feedback; optical filtering; Optical filters; Optical interferometry; Optical noise; Optical receivers; Optical telecommunications; perturbation; Phase noise; phase-shift keying (PSK); return to zero (RZ); Signal and communications theory; Signal, noise; Statistics; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Phase noise; RZ code; Monte Carlo method; Filtering; Phase shift; Gaussian distribution; Coherent transmission; differential phase-shift keying (DPSK); Perturbation; laser linewidth; Phase shift keying; Laser noise; Optical filter; Optical transmission; phase-shift keying (PSK); Intersymbol interference; Line width; Optical characteristic; Phase coherence; return to zero (RZ); Numerical simulation; optical filtering; Differential phase shift keying; Importance sampling
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2008.925036

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.