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在密集波分复用(DWDM)系统中进行多信道色散补偿时,需要把多个光纤光栅串联在一起使用,这样连接在后面的光纤光栅的插损会因为背景损耗的存在而随着光纤光栅数量的增加而增大,尤其是波长较多的时候,接在最后的信道的插损会显著增大,这将制约光纤光栅的最大连接数。通过实验探讨了光纤的紫外曝光造成的背景损耗对串联的窄带啁啾光纤光栅的影响以及对光纤光栅最大连接数的限制。
When performing multi-channel dispersion compensation in a DWDM system, multiple FBGs need to be connected in series, so that the insertion loss of the FBGs connected in the back will increase with the FBG The increase of the number increases, especially when the wavelength is large, the insertion loss of the last channel increases significantly, which will restrict the maximum number of connections of the fiber grating. The influence of the background loss caused by UV exposure on the narrowband chirped fiber gratings in series and the limitation on the maximum number of fiber gratings are discussed experimentally.