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Performance Implications of Cascaded Wavelength Selective Switches on a Probabilistically Shaped 64-QAM System
Journal of Lightwave Technology ( IF 4.7 ) Pub Date : 2020-03-15 , DOI: 10.1109/jlt.2019.2957613
Linan Li , John C. Cartledge , Ahmed I. Abd El-Rahman

The effect of bandwidth narrowing originating from the cascading of wavelength selective switches (WSSs) on the generalized mutual information is assessed for probabilistically shaped, 28 Gbaud, 64-ary quadrature amplitude modulation (QAM) constellations. The system simulation includes the generation of shaped symbol sequences based on the Maxwell—Boltzmann distribution, cascaded WSS filters, simplified detection, and calculation of the bit-wise achievable information rate (BW-AIR). Results are compared for a noise loading configuration and a more practical distributed noise configuration. The statistical variations in the filter responses are addressed by considering 1000 realizations that result from randomly selected parameters for each of the individual WSS filter responses. Experimental results for a noise loading configuration and emulation of the overall frequency response for a filter cascade exhibit good agreement with corresponding simulation results.

中文翻译:

级联波长选择开关对概率形状 64-QAM 系统的性能影响

对于概率形状的 28 Gbaud、64 进制正交幅度调制 (QAM) 星座,评估源自波长选择开关 (WSS) 级联的带宽变窄对广义互信息的影响。系统仿真包括基于 Maxwell-Boltzmann 分布的成形符号序列的生成、级联 WSS 滤波器、简化检测和逐位可实现信息速率 (BW-AIR) 的计算。比较噪声负载配置和更实用的分布式噪声配置的结果。过滤器响应中的统计变化是通过考虑 1000 次实现来解决的,这些实现是由每个单独的 WSS 过滤器响应的随机选择的参数产生的。
更新日期:2020-03-15
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