提出了一种用于40 Gb/s单信道光纤通信系统中的动态色度色散(CD)补偿技术。采用2×2光开关,色散补偿光纤(DCF)等器件构成可调节色度色散补偿器;提取中心频率为12GHz的窄带电功率信号作为反馈信号控制可调节色度色散补偿器,提取的窄带电功率值随系统中的累积色度色散值的增大而减小。实验证明,整个补偿系统的最长响应时间为0.7 s;补偿范围和补偿精度分别为81.55 ps/nm和5.28 ps/nm,通过增加光开关的数量和缩短每段色散补偿光纤的长度可以进一步提高补偿范围和精度。通过对比补偿前后系统的眼图可以看出：该系统能有效地补偿40 Gb/s光纤通信系统中动态变化的色度色散。

A dynamic chromatic dispersion (CD) compensating technique for a 40 Gb/s single-channeled optical fiber communication system is demonstrated. The tunable dispersion compensator is composed of 2×2 optical switches, dispersion compensating fiber etc. For controlling the tunable dispersion compensator, a feedback signal is obtained by detecting the narrow band electrical power centered at 12 GHz, and the electrical power increases with the decrease of the accumulated chromatic dispersion. In experiment, the maximal response time of the system is 0.7 s. The compensating range and precision reach 81.55 ps/nm and 5.28 ps/nm respectively which can be further improved by adding the number of optical switches and reducing the length of dispersion compensating fiber. Experiments indicated that the dynamic dispersion compensating system can significantly improve the performance of 40 Gb/s optical communication systems according to the eye diagram before and after dispersion compensating.