不同切趾比例下啁啾光纤光栅的特性研究  

Analysis of Chirped Fiber Bragg Gratings with Different Asymmetric Apodization Ratios

作　　者：吕明双[1] 冯德军[1] 

机构地区：[1]山东大学信息科学与工程学院,济南250100

出　　处：《半导体光电》2009年第4期536-540,共5页Semiconductor Optoelectronics

基　　金：山东省中青年科学家奖励基金项目(2006BS01001);山东省自然科学基金项目(Q2007G03)

摘　　要：对称切趾啁啾光纤光栅能够抑制反射旁瓣、平滑群时延曲线,但反射谱带宽利用率低。与对称切趾相比,非对称切趾光栅在保持群时延曲线基本不变的前提下,反射谱3 dB带宽提高了64.08%,同时群时延纹波振荡也得到了一定的抑制。利用升余弦函数对光栅的长波长端和短波长端进行了不同比例的切趾仿真,发现长波长端30%切趾、短波长端20%切趾能够有效地提高光栅的反射带宽,同时可将群时延纹波压低在±2 ps之内。Symmetrical apodization technique of the chirped fiber Bragg grating has the advantages of suppressing the sidelobs of reflection spectra and smoothing the curves of group delay. However, it shortens the bandwidth of the reflection spectrum. Compared with symmetrical apodization method, asymmetric method can increase the 3 dB bandwidth by 64.08% without the change of group delay curves. The apodization simulation is conducted by using a rised cosine function with different apodization ratios at both ends of the grating. There is a compromise between the bandwidth and the group delay ripple. The result shows that the grating with a 30 % apodization at the long wavelength end and a 20% apodization at the short wavelength side can improve the reflection bandwidth effectively and depress the group delay ripple within the range of 2 ps.

关 键 词：啁啾光纤光栅 耦合模理论 非对称切趾 群时延纹波 

分 类 号：TN253[电子电信—物理电子学]