Zhijuan Tu, Pan Gong, Zhiping Zhou*, and Xingjun Wang*
Japanese Journal of Applied Physics 55, 04EC04 (2016)

Abstract: With the rapid evolution of Internet trac, global informa-tion, and communication networks, there has been continu-ously increasing demand for the optical communication systems with a high bandwidth, high spectral eciency, and low cost.1–3) In order to satisfy the standards for clients and line side interfaces, the IEEE Ethernet and the International Telecommunication Union-Telecommunication optical trans-port network (ITU-T OTN) standardization sector ratified 100 Gbps as the first optical transport bitrate hierarchy.4) However, optical systems with channel data rate of 100 Gbps are dicult to achieve. A promising solution is optical coherent communication, which was extensively studied in the 1980’s.5).In coherent communication systems, owing to the utilization of polarization-division-multiplexed quadra-ture phase-shift keying (PDM-QPSK) or even more advanced modulation formats, the individual components can operate at a lower data rate. Thus the bandwidth demands on the components can be not so stringent.3,4) Therefore, coherent transmission has become a key technology for high-capacity, long-haul communications systems with a 100 Gbps channel data rate and beyond.




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