Comparison of RZ and NRZ Formats in 112-Gb/s PDM-QPSK Long Haul Coherent Transmission Systems
06 March 2011
We show that 112-Gb/s PDM-QPSK coherent transmission systems with RZ pulse shape has better tolerance to ROADM effects than NRZ, and time-interleaved RZ- and CSRZPDM-QPSK outperform NRZ-PDM-QPSK in nonlinear transmission even with tight filtering. © 2011 Optical Society of America OCIS codes: (060.2330) Fiber optics communications; (060.1660) Coherent communications; (060.4370) Nonlinear optics, fibers ;