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在正交频分多址无源光网络上行传输中,不同光网络单元的上行信号如果采用相同波长的不同激光器将会产生光拍频噪声,使得光网络单元的无色性难以实现.本文以正交频分多址无源光网络为研究对象,通过对系统结构的研究和相关公式的推导,分析了信号上行传输中光拍频噪声的产生原因和避免方式.针对下行发送上行载波结合光线路终端相干接收的光拍频噪声避免方案进行了仿真研究.分析了系统的抗色散方案以及色散累积和训练序列长度对系统性能的影响,给出了优化的参数设置,为系统实际应用提供了理论参考.
In uplink transmission of Orthogonal Frequency Division Multiple Access passive optical network, if different optical elements with the same wavelength are used in the uplink signals of different optical network units, optical beat frequency noise will be generated, which makes it difficult to realize the colorlessness of optical network units. In this paper, Orthogonal Frequency Division Multiple Access passive optical network as the research object, through the study of the system structure and derivation of the relevant formula, the reason and avoidance mode of the optical beat frequency noise in the uplink signal transmission are analyzed. The scheme of avoiding coherent lightwave frequency noise received by the line terminal is simulated.Analysis of the anti-dispersion scheme of the system and the impact of dispersion accumulation and training sequence length on the system performance, and the optimized parameter settings are given, which provide the practical application of the system Theoretical reference.