线性啁啾布拉格光栅的切趾强度优化分析

Analysis of the Apodization Strength of Linearly Chirped Bragg Gratings for Dispersion Compensation

介绍了布拉格色散补偿光纤光栅切趾强度参数的优化过程。以双曲正切函数为例,证明适当选择切趾强度参数,可以获得最小色散背离、最大的反射带宽和最小的群时延影响。考虑到光纤越短群时延振幅越小,而光纤越长带宽越大,进而分析了光纤链接长度的影响,结果表明当光纤长度约等于80 km时,可以平衡上述两方面的要求,即获得较小的群时延影响和所需的带宽。

An optimization process for the apodization strength factor of fiber Bragg grating dispersion compensators is presented. The positive hyperbolic-tangent profile is taken for example and it will demonstrate that a proper selection of the apodization strength factor can effectively improve the results obtaining minimum deviation of the dispersion from the required value, maximum reflection bandwidth and minimum group delay ripple impact. Owing to the fact that shorter links minimize the group delay ripple amplitude, whereas the longer ones maximize the bandwidth of interest, the influence of the fiber link length is discussed. The result shows that a fiber link length of 80 km can meet the requirements of group delay ripple impact and bandwidth.