提出了采用幅移键控（ＡＳＫ）调制的波分复用（ＷＤＭ）系统中光滤波器带宽的优化设计问题。并根据对长距离波分复用系统中影响信噪比的主要因素的分析，计算了优化设计问题，数值计算给出了一些有意义的结果 The optimal design of optical filter bandwidth in WDM system using amplitude shift keying (ASK) modulation is proposed. Based on the analysis of the main factors affecting signal-to-noise ratio in long-wavelength WDM system, the optimization design problem is calculated, and the numerical calculation gives some meaningful results