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Title: On decision aided carrier phase and frequency offset estimation in coherent optical receivers
Authors: Meiyappan, A.
Kam, P.-Y. 
Kim, H. 
Keywords: Block $M$th power
cycle slip
differential encoding
fast Fourier transform
frequency offset
laser phase noise
Issue Date: 2013
Source: Meiyappan, A., Kam, P.-Y., Kim, H. (2013). On decision aided carrier phase and frequency offset estimation in coherent optical receivers. Journal of Lightwave Technology 31 (13) : 2055-2069. ScholarBank@NUS Repository.
Abstract: We investigate carrier estimation (CE) for coherent optical receivers where the received signal is impaired by additive white Gaussian noise, laser phase noise, and frequency offset. Best practical 4-, 8-, and 16-point constellations are identified. A generalized differential encoding rule for signal constellations is presented. Performance of our complex-weighted decision-aided maximum-likelihood (CW-DA-ML) phase noise and frequency offset estimator is analyzed at low signal-to-noise ratio (SNR) and the optimal filter lengths are found. CW-DA-ML CE is put in perspective with respect to two fundamental estimators in the literature: (i) differential frequency estimator followed by block $M$th power phase estimator (DiffFE-$M$th CE), and (ii) fast Fourier transform based frequency estimator followed by block $M$th power phase estimator (FFTbE-$M$ th CE), in terms of laser linewidth tolerance, frequency estimation range and speed, SNR threshold, and cycle slip probability. CW-DA-ML CE is 2.5 and 10.5 times faster than DiffFE-$M$ th CE in 4 phase-shift keying and 16 quadrature amplitude modulation signals, respectively, at a 1-dB system penalty for a bit-error rate of $10-3. Our CE has lower cycle slip probability and transmission overhead than DiffFE-$M$th and FFTbE-$M$th CE. Hence, our CE is shown to be favourable in pilot-assisted (PA) systems. A PA CW-DA-ML CE is introduced and shown to be robust against time-varying frequency offset with minimal training overhead. Analog-to-digital convertor quantization error on our CE performance is also addressed. © 1983-2012 IEEE.
Source Title: Journal of Lightwave Technology
ISSN: 07338724
DOI: 10.1109/JLT.2013.2260723
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