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在高速光纤通信数字相干接收系统中,色散补偿模块的结构和性能将直接决定其是否具有实用价值。设计了比传统的有限脉冲响应(FIR)滤波器结构简单的偶对称型FIR滤波器,并通过数值仿真分析了FIR滤波器长度选取对补偿效果的影响。研究结果表明,在接收端光信噪比(OSNR)代价不高于1dB的情况下,FIR滤波器长度折衷选取为最大值的65%,这样既能有效地补偿色散损伤,又可以降低FIR滤波器实现的复杂度。
In the high-speed optical fiber communication digital coherent receiving system, the structure and performance of the dispersion compensation module will directly determine whether it has practical value. The symmetrical FIR filter with simpler structure than traditional Finite Impulse Response (FIR) filter is designed. The influence of FIR filter length selection on the compensation effect is analyzed by numerical simulation. The results show that the length compromise of the FIR filter is chosen to be 65% of the maximum when the optical signal-to-noise ratio (OSNR) of the receiving end is not more than 1 dB, which can not only effectively compensate the dispersion damage but also reduce the FIR filtering The complexity of the implementation.