改进的锯齿形光谱滤波器  

Modified jammed-array wideband sawtooth filter

作　　者：谭中伟[1] 赵峰[1] 李睿[1] 何飞[1] 

机构地区：[1]北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室,北京100044

出　　处：《光电子．激光》2013年第10期1855-1861,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61177012);北京交通大学红果园双百人才计划资助项目

摘　　要：锯齿形光谱(JAWS)滤波器的光谱成分比较复杂,是一种较难实现的光谱滤波器。本文通过数值仿真对基于虚像相位阵列(VIPA)的JAWS滤波器的主要参数如线性度、占空比和信噪比(SNR)等进行了优化,并进行了实验验证;通过对JAWS滤波器插损的分析,将反射式的工作方式改变为透射式的工作方式,使整个滤波器的附加损耗从20dB减小到小于6dB;同时,滤波器的性能也有了明显的进步。Jammed-array wideband sawtooth （JAWS） filter has periodic multi-channel sawtooth spec- trum. Due to the complex spectral components, it＇s difficult to make a passive multi-channel sawtooth fil- ter. In this article,we present a modified JAWS filter with low loss. It only consists of four elements,in- eluding a fiber collimator, two lenses and a virtually-imaged phased array （VIPA）. The beam transmitted through the VIPA is collected by a lens and a large area photodetector rather than a mirror is used to re- flect the beam back into the fiber. The extra insertion loss is lower than 6 dB and the performance of the filter is much better than that of the JAWS filter with beam reflected by a mirror. The main characteris- tics of the jammed-array wideband sawtooth filter based on a virtually-imaged phased array are studied systematically. The main parameters, such as linearity, duty cycle and signal-to-noise ratio,are optimized by numerical simulation and tested by the experiment. Since the free spectrum range of the filter is decid- ed by the thickness of VIPA,the optimization of VIPA with different thicknesses is also discussed. The filter might be used in fast sensitive interrogation of concatenated multi-channel fiber Bragg grating sen- sors and ultra-high-frequency electrical sawtooth waveform generation.

关 键 词：光滤波器 光纤布拉格光栅(FBG)解调 虚像相位阵列(VIPA) 锯齿波 

分 类 号：TN713[电子电信—电路与系统]