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학술지 Mitigation of Imperfect Carver Induced Phase Distortions in a Coherent PM-RZ-QPSK Receiver
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저자
정환석, 장순혁, 김광준
발행일
201012
출처
IEEE/OSA Journal of Lightwave Technology, v.28 no.24, pp.3506-3511
ISSN
0733-8724
출판사
IEEE, OSA
DOI
https://dx.doi.org/10.1109/JLT.2010.2090131
협약과제
10MI1700, 100Gbps급 이더넷 및 광전송기술개발, 김광준
초록
The impact of phase distortions caused by imperfect return-to-zero (RZ) pulse carving on 112 Gb/s polarization-multiplexed (PM)-RZ-quadrature-phase- shift-keying (QPSK) is investigated, and mitigation of the phase distortion is demonstrated by using digital signal processing technique. We show that carver-induced phase distortion causes an error in frequency offset estimation as well as sensitivity degradation. Based on the periodicity of distortion pattern, the phase distortion is compensated by estimating mean phase distortions for even and odd symbols after block phase estimation and subtracting these values from original symbols. The optical SNR penalty measured at 112 Gb/s PM-RZ-DQPSK signal is reduced from 3.8 to 1.1 dB with the help of correction algorithm. © 2006 IEEE.
키워드
100 Gb/s, coherent, pulse carver, return-to-zero quadrature- phase-shift-keying (RZ-QPSK)
KSP 제안 키워드
100 Gb/s, Correction algorithm, Digital Signal Processing, Frequency Offset Estimation, Phase distortion, Processing technique, Sensitivity degradation, phase estimation, phase shift keying, return-to-zero(RZ)