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分析了DWDM通信系统中光纤光栅滤波器色散特性对码率的影响，计算了啁啾超高斯型光脉冲情形下光栅滤波器的码率限制。计算表明，啁啾的存在严重地恶化了色散展宽，当光栅长度为几cm、信道间距与信道带宽的比值（△／Bw）≤5时，啁啾光脉冲成为限制码率的主要因素。当（△／Bw）较大时，为减少色散的影响，对光纤光栅的长度应作限制。
The influence of dispersion characteristics of FBG filters on the code rate in DWDM communication system is analyzed. The code rate limit of the grating filters under the chirped super-Gaussian pulse is calculated. The results show that the chirp is severely deteriorated and the chirped pulse becomes the main factor limiting the bit rate when the grating length is a few cm and the ratio of channel spacing to channel bandwidth (Δ / Bw) ≤5. When (△ / Bw) larger, in order to reduce the impact of dispersion, the length of the fiber grating should be limited.