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Decision-Aided, Pilot-Aided, Decision-Feedback Phase Estimation for Coherent Optical OFDM Systems

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3 Author(s)
Shengjiao Cao ; Department of Electrical and Computer Engineering, National University of Singapore, Singapore ; Pooi Yuen Kam ; Changyuan Yu

We propose two phase estimation methods for coherent optical orthogonal frequency-division multiplexing (OFDM) systems, the decision-aided (DA) plus pilot-aided (PA) scheme and DA plus decision feedback (DF) scheme. We further investigate the combinations of DA, PA, and DF in a simulated 40-Gb/s single polarization system. DA+PA helps to increase the phase noise tolerance of DA and reduce the overhead of PA, while DA+DF reduces the overhead to zero and achieves the best performance with one more step of estimation, compensation, and demodulation.

Published in:

IEEE Photonics Technology Letters  (Volume:24 ,  Issue: 22 )