非线性系统
非线性失真
公制(单位)
概率逻辑
滤波器(信号处理)
控制理论(社会学)
振幅
计算机科学
干扰(通信)
选择(遗传算法)
失真(音乐)
电子工程
电信
频道(广播)
工程类
物理
光学
人工智能
带宽(计算)
放大器
运营管理
控制(管理)
量子力学
计算机视觉
作者
Mohammad Taha Askari,Lutz Lampe,J. Mitra
标识
DOI:10.1109/jlt.2023.3264032
摘要
Probabilistic amplitude shaping (PAS) is a practical means to achieve a shaping gain in optical fiber communication. However, PAS and shaping in general also affect the signal-dependent generation of nonlinear interference. This provides an opportunity for nonlinearity mitigation through PAS, which is also referred to as a nonlinear shaping gain. In this paper, we introduce a linear lowpass filter model that relates transmitted symbol-energy sequences and nonlinear distortion experienced in an optical fiber channel. Based on this model, we conduct a nonlinearity analysis of PAS with respect to shaping blocklength and mapping strategy. Our model explains results and relationships found in literature and can be used as a design tool for PAS with improved nonlinearity tolerance. We use the model to introduce a new metric for PAS with sequence selection. We perform simulations of selection-based PAS with various amplitude shapers and mapping strategies to demonstrate the effectiveness of the new metric in different optical fiber system scenarios.
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