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光纤损耗和色度色散是限制高速光纤系统传输容量的两个主要因素。损耗导致光在光纤中的衰减,传输一定距离后需要放大;而色度色散引起脉冲展宽,长距离传输需要色散补偿或采用其它色散管理手段。利用色散补偿光纤既可以进行色散补偿,又能作为喇曼光放大器增益介质使用的特点,分别测量了光纤的色散特性和喇曼增益特性,设计了通过色散补偿光纤同时进行色散补偿和喇曼光放大的系统方案,实验结果表明50公里单模光纤的色散和损耗(约10dB)可以通过采用5.6公里色散补偿光纤、具有12dB增益的Raman光放大器完全补偿。
Fiber loss and chromatic dispersion are two major factors that limit the transmission capacity of high-speed fiber systems. Loss leads to attenuation of light in the fiber, which needs to be amplified after transmission of a certain distance. Chromatic dispersion causes pulse broadening, and long-distance transmission requires dispersion compensation or other dispersion management measures. The dispersion compensating fiber can be used for both dispersion compensation and Raman optical amplifier gain medium. The dispersion characteristic and the Raman gain characteristic of the fiber are respectively measured. The dispersion compensating fiber and the Raman spectrum The experimental results show that the dispersion and loss of 50 km single-mode fiber (about 10 dB) can be completely compensated by Raman optical amplifier with 12 dB gain using 5.6 km dispersion compensation fiber.