Abstract
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.
© 2010 IEEE
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