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11 November 2008 DPSK-3ASK transmission optimization by adapting modulation levels
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Proceedings Volume 7136, Optical Transmission, Switching, and Subsystems VI; 71360H (2008)
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China
For metro and regional 100-Gbps transmission, a transparent channel reach of 500-600 km is required and a 100-GHz channel grid is typically used. For these applications, a cost effective modulation format is introduced which can make use of electronic components designed for the already established 40-Gbps market, bypassing the requirements for novel electronic developments and therefore reducing the component cost. With this DPSK-3ASK modulation format, five information bits are transmitted in two consecutive symbols, leading to a symbol rate of 45 Gbaud, including overhead for framing and FEC. To minimize hardware requirements and to create a cost-effective solution, a single Mach-Zehnder modulator can be used to create the optical DPSK-3ASK signal after combining the phase and amplitude modulation signals into a 6-level modulator drive voltage. In this paper, it is demonstrated by numerical simulations that these voltage levels can be modified to adapt to varying signal distortions and thereby yield improved transmission performance. It is shown that by dynamically modifying the modulation levels based on the channel performance, dynamic signal impairments such as the non-linear effects from varying power levels, changes in chromatic dispersion, or varying PMD levels can be mitigated. Error-free performance (with FEC) can be obtained with 24 dB OSNR and 7ps DGD for a 112-Gbps (45-Gbaud) optical signal.
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Michael H. Eiselt and Brian T. Teipen "DPSK-3ASK transmission optimization by adapting modulation levels", Proc. SPIE 7136, Optical Transmission, Switching, and Subsystems VI, 71360H (11 November 2008);

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