级联Sagnac环微波光子滤波器调谐特性的改进  

Improvement of the tuning characteristics of cascaded sagnac loop microwave photonic filter

作　　者：王翀 王姣 高伟 张进玉 赵瑶 WANG Chong;WANG Jiao;GAO Wei;ZHANG Jinyu;ZHAO Yao(School of Electronic Engineering,Xi＇ an University of Posts an d Telecommunications,Xi＇ an 710121,China)

机构地区：[1]西安邮电大学电子工程学院

出　　处：《光学技术》2018年第4期413-418,共6页Optical Technique

基　　金：国家自然科学基金(11604262)

摘　　要：提出一种方案,可改善Sagnac环微波光子滤波器的调谐特性。将高双折光子晶体光纤（HiBi-PCF）Sagnac环级联,对其臂长误差进行定量分析。利用Jones矩阵对级联后的两种Sagnac环进行理论分析,设定功率损耗阈值为8dB,分析级联后的Sagnac环臂长误差容限。通过改变臂长,可实现滤波器带宽连续可调;所得滤波器的旁瓣不到0.4,臂长误差容限可达到136nm,带宽调谐可达0.1nm至0.02nm之间。得到的透射谱更加精确,调谐简单、精确、应用灵活。A scheme is proposed to improve the tuning characteristics of Sagnac ring microwave photonic filters.The high folded photonic crystal fiber（HiBi-PCF）Sagnac ring is cascaded and the tolerance of arm length error is quantitatively analyzed.Based on the Jones matrix,some theoretical analysis of two cascaded Sagnac loop is carried out.Assuming the power loss threshold value is 8 dB,the error margin of the Sagnac loop arm is analyzed.By changing the length of the arm,the bandwidth of the filter can be adjusted continuously.The sidelobe of the filter is less than 0.4,the arm length error margin can reach 136 nm,and the bandwidth tuning can be between 0.1 nm and 0.02 nm.The transmission spectrum obtained by this method is more accurate,and the tuning is simple,accurate and flexible.

关 键 词：微波光子滤波器 高双折射光子晶体光纤 SAGNAC环 臂长误差 调谐特性 

分 类 号：TN911.74[电子电信—通信与信息系统]