We present a data-aided multi-symbol phase estimation scheme to improve the receiver sensitivity of direct-detection DQPSK to approach that of coherent-detection QPSK in optically pre-amplified receivers. Performance-enhancement of >2 dB is obtained in a nonlinear-regime
© 2006 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications
(060.5060) Fiber optics and optical communications : Phase modulation
X. Liu, " Data-Aided Multi-Symbol Phase Estimation for Receiver Sensitivity Enhancement in Optical DQPSK," in Optical Amplifiers and Their Applications/Coherent Optical Technologies and Applications, Technical Digest (CD) (Optical Society of America, 2006), paper CThB4.
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