Comparison of RZ and NRZ formats in 112-Gb/s PDM-QPSK long haul coherent transmission systems

We show that 112-Gb/s PDM-QPSK coherent transmission systems with RZ pulse shape have better tolerance to ROADM filtering than NRZ, and time-interleaved RZ-PDM-QPSK outperform NRZ-PDM-QPSK in nonlinear transmission even with tight filtering.

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Bibliographic Details
Main Authors: Chongjin Xie, Raybon, G, Chandrasekhar, S
Format: Conference Proceeding
Language:English
Subjects:
(060.1660) Coherent communications
(060.2330) Fiber optics communications
(060.4370) Nonlinear optics
fibers
Filtering
Nonlinear optics
Optical add-drop multiplexers
Optical fibers
Optical filters
Phase shift keying
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Description
Summary:We show that 112-Gb/s PDM-QPSK coherent transmission systems with RZ pulse shape have better tolerance to ROADM filtering than NRZ, and time-interleaved RZ-PDM-QPSK outperform NRZ-PDM-QPSK in nonlinear transmission even with tight filtering.
DOI:10.1364/nfoec.2011.jtha039