对光纤布拉格光栅法布里-珀罗腔纵模间隔问题的研究  

A study on the interval between longitudinal modes of Fabry-Perot cavity composed of fiber Bragg gratings

作　　者：任文华[1] 王燕花[1] 冯素春[1] 谭中伟[1] 刘艳[1] 简水生[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：《物理学报》2008年第12期7758-7764,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60607001;60707007)资助的课题~~

摘　　要：对光纤布拉格光栅(FBG)法布里-珀罗(F-P)腔的透射特性进行了深入分析,指出了FBGF-P腔透射谱中纵模位置的影响因素,讨论了与普通F-P腔的联系和区别.应用光栅的有效镜面模型对FBG反射主瓣内反射系数的相位因子进行线性模拟,定义了FBG有效长度的概念并得出其表达式.提出将FBG的有效长度纳入到FBGF-P腔的等效腔长中,用等效腔长来计算FBGF-P腔中的纵模间隔.数值仿真和实验结果都表明,用等效腔长计算所得的纵模间隔与实际的FBGF-P腔中的纵模间隔符合很好,误差极小.The characteristics of transmission spectrum of the Fabry-Perot （F-P） cavity composed of two fiber Bragg gratings （FBG） are analyzed detailedly in this paper. The influencing factors of the position of the longitudinal mode are pointed out. The relationship and difference between the FBG F-P cavity and normal F-P cavity are discussed. The phase factor of the amplitude reflection coefficient in the range of the FBG main lobe is simulated linearly using the effective mirror surface model. The effective length of the FBG is defined and the expression of the effective length is obtained. Furthermore, the effective length of the FBG is brought into the equivalent cavity length of the FBG F-P cavity. The interval between longitudinal modes of the FBG F-P cavity is calculated using the equivalent cavity length. Both the numerical simulation and experimental results show that the interval calculated using the equivalent cavity length accords well with the true interval between longitudinal modes of the FBG F-P cavity.

关 键 词：光纤布拉格光栅 法布里-珀罗腔 纵模间隔 有效镜面模型 

分 类 号：TN253[电子电信—物理电子学] TN248.21