高速大容量光纤光栅解调仪的研究  

Research of High-Speed Large-Capacity Fiber Bragg Grating Demodulator

作　　者：李政颖[1] 周祖德[1] 童杏林[1] 熊涛[1] 唐智浩[1] 蔡林均[1] 赵猛[1] 

机构地区：[1]武汉理工大学信息工程学院光纤传感技术与信息处理教育部重点实验室,湖北武汉430070

出　　处：《光学学报》2012年第3期52-57,共6页Acta Optica Sinica

基　　金：国家自然科学基金(51175389;50935005);中央高校基本科研业务费专项资金(2011-IV-032);湖北省宽带无线通信与传感器网络重点实验室开放基金资助课题

摘　　要：采用半导体光放大器和可调谐法布里-珀罗滤波器,以环路结构组成高速扫描激光器,结合光耦合器、光环路器和光电二极管等,形成4通道大容量高速光纤光栅解调仪。系统采用2kHz的类三角波调制信号,驱动法布里-珀罗滤波器在50nm的光谱范围内进行快速扫描。通过引入光纤梳状滤波器和单峰滤波器组成的参考通路,消除法布里-珀罗滤波器的非线性效应和扫描波长漂移问题,使得解调仪具有很好的稳定性和线性度。高速光纤光栅解调仪的稳定性为2pm,分辨率为1pm,线性度为0.99957,测量精度为5pm,解调频率为2kHz。A four-channel large-capacity, high-speed fiber Bragg grating demodulator is proposed. It constitutes of semiconductor optical amplifier and tunable Fabry-P6rot filter which is composed a high-speed scan laser in a loop structure, combining the optical coupler, optical loop circuit and photodiode. A 2 kHz triangular-like modulation signal is used in this system to drive the Fabry-P6rot filter to make fast scan in the range of 50 rim. The nonlinear effect and scan wavelength shift can be eliminated in Fabry-P6rot filter by introducing the reference channel composed by optical fiber comb filter and single-peak filter, leading to the excellent stability and linearity of demodulator. The stability of high-speed fiber Bragg grating demodulator is 2 pm; the resolution is 1 pm; the linearity is 0. 99957; the measuring accuracy is 5 pm, the demodulation frequency is 2 kHz.

关 键 词：光纤光学 光纤传感 光纤布喇格光栅 高速解调 可调谐法布里-珀罗滤波器 非线性 

分 类 号：O433.1[机械工程—光学工程]