摘要
滤波器是通信中一种重要的器件,相移光纤光栅因其显著的滤波特性,可作为带阻滤波器应用于密集波分复用系统,实现光信号的解调。影响相移光纤光栅滤波特性的因素有很多,通过相移光纤光栅的耦合模理论分析,并利用MATLAB语言编程计算出相移光纤光栅的单波长、双波长和多波长滤波反射谱。结果发现:光栅参数的变化会使相移光纤光栅滤波特性发生改变;当进行双波长滤波时,反射谱将随着相移点位置由内向外的改变而向内塌缩;多波长滤波时,相移点位置不同可分别出现多透射窗口和超宽矩形透射窗口。
Filter is a kind of component which is very important in communication, and the notable filter characteristics of phase-shifted fiber grating can be used as a band-stop filter in DWDM system to realize the optical signal demodulation. A lot of factors influence filter characteristics of phase-shifted fiber grating. Through analyzing phase-shifted fiber grating of coupled mode theory, and using MATLAB software to simulate, a single-wavelength, double-wavelength and multi-wavelength reflective spectrum of phase-shifted fiber grating can be get. It is found that different grating parameters will change phase-shifted fiber grat- ing spectrum in different ways; when filtering dual-wavelength, its reflective spectrum will collapse inward with the location change of the phase shift points from the inside out; when filtering multi-wavelength, with different phase shift points location, a multi-transmissionwindow or a ultra wide rectangular transmission window come out.
出处
《光散射学报》
北大核心
2015年第3期291-298,共8页
The Journal of Light Scattering
关键词
相移
反射谱
透射窗口
滤波器
phase shift
reflective spectrum
transmission window
filter
