基于光环路正交频分多址无源光网络的光拍频噪声避免方案及性能仿真(英文)

The Simulation of Optical Beating Interference Avoidance Scheme and System Performance in Orthogonal Frequency Division Multiple Address Passive Optical Network System Based on Optical Loop

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 Orthogonal Frequency Division Multiple Access Passive Optical Network （OFDMA-PON） upstream transmission, the Optical Beating Interference （OBI） will be produced if each ONU uses different lasers with the same wavelength. The colorless ONU is hard to achieve with the presence of OBI. The OFDMA-PON system structure was studied and the related formulas were derived to analyze the generation and avoidance of OBI. The OBI avoidance scheme that sending optical carrier used in upstream by downstream transmission combined with coherent detection in optical line terminal was simulated. Via simulation, the anti-dispersion scheme and the effects of dispersion accumulation and the length of training sequence on system performance were studied, and the parameter configuration was optimized to provide a theory reference for practical application.