Reduction of Four Wave Mixing in Long-Haul Large-Capacity Frequency Division Multiplexing Optical Fiber Transmission Systems

在长距离大容量频分复用光纤传输系统中，由于三阶非线性光效应产生四波混频光。混频光与信号光一起入射到接收机上，混频光是产生噪声的原因。在本研究中，提出了新的光频率、信号脉冲和偏振分配方法，并分析了FWM噪声。同时降低了FWM噪声和总带宽。

In long-haul large-capacity frequency division multiplexing optical fiber transmission systems, four-wave-mixing (FWM) light is generated due to the third-order nonlinear optical effect. The FWM light is incident upon the receiver with the signal light, and the FWM light is the cause of the noise. In this research, new allocations of light frequencies, signal pulses, and polarizations were proposed and the FWM noise was analyzed. Both FWM noise and the total frequency bandwidth were reduced.