基于OCDMA系统的光纤光栅频谱特性分析

Analysis of Frequency Spectrum Characteristics of Fiber Gratings Based on OCDMA System

该文研究了光纤布拉格光栅阵列的反射谱,分析了几种不同的切趾函数对旁瓣的影响。讨论了啁啾光栅的反射谱性能,结论表明了啁啾系数和折射率调制深度是影响啁啾光栅反射谱特性的主要因素,通过切趾技术可以改善啁啾光栅的性能,使其适用于OCDMA系统。重点分析了相移超结构光纤光栅(SSFBG)的原理,并设计出了一种码长31的gold码SSFBG编解码器,仿真了其反射谱曲线。

The reflectivity spectrum of the fiber Bragg grating arrays based encoder/decoder in communication system is studied, and the effects of several kinds of apodization on the reflected spectral sidelobes of the grating is analyzed. The discussion of chirp fiber Bragg grating show that both chirp coefficient and index modulation depth are the key factors which influent the spectral reflection of chirp fiber Bragg grating. It is shown that apodization is a good method to improve the performance of chirp fiber Bragg grating, made it suitable to OCDMA system.The basic principle of SSFBG is analysised specifically,a gold code SSFBG which has the code length of 31 is designed,and its spectral reflection curve is presented.