Title :
Decision-Aided, Pilot-Aided, Decision-Feedback Phase Estimation for Coherent Optical OFDM Systems
Author :
Cao, Shengjiao ; Kam, Pooi Yuen ; Yu, Changyuan
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
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.
Keywords :
OFDM modulation; automatic repeat request; demodulation; light coherence; light polarisation; optical noise; phase estimation; phase noise; DF scheme; bit rate 50 Gbit/s; coherent optical OFDM systems; coherent optical orthogonal frequency-division multiplexing systems; decision-aided pilot-aided decision-feedback phase estimation; demodulation; phase estimation methods; phase noise tolerance; simulated single polarization system; Demodulation; Laser noise; OFDM; Optical noise; Optical receivers; Phase estimation; Phase noise; Coherent; laser phase noise; orthogonal frequency-division multiplexing (OFDM); phase estimation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2219522
