引入衰减的多腔法布里-珀罗滤波器的特性分析  

Characteristic Analysis of Multi-Cavities Fabry-Prot Filters with Attenuation

作　　者：孙雪铮[1] 陈海星[1] 顾培夫[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州310027

出　　处：《光学学报》2005年第7期970-975,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60478301)资助课题

摘　　要：多腔法布里珀罗滤波器是光纤通信中的关键器件,为了改善该器件的透过光谱的性能,讨论了衰减对器件性能的影响。利用多镜理论以两种不同方法推导了在多腔级联法布里珀罗滤波器件中引入衰减时信号透过率的传输矩阵算法。以三腔法布里珀罗滤波器为例,数值模拟计算证明了当引入衰减时,可以有效抑制多腔法布里珀罗器件的内部串扰,改善通带内信号的透过率,提高了通带信号的利用率。通过对引入不同衰减时器件透过率的计算,详细比较和讨论了透过率与衰减系数的关系,以及不同衰减时次峰与主峰的相对关系,同时使用薄膜设计软件TFC进行模拟,证实了结果的准确性。最后为尽量减少系统因引入衰减的损耗,提出了减少衰减系数的方法,即增大反射镜的反射率,并以矩阵运算的结果证明其可行性。Multi-cavities Fabry-Prot filter is a key device used in optical fiber communication system. To improve the transmission spectrum, the influence of attenuation on the device is discussed here. A matrix treatment is presented by two different methods based on multi-mirror theory to calculate the transmission characteristics of the multi-cavities Fabry-Prot filters with attenuation. As an example, the transmission of a three-cavities Fabry-Prot filter with different attenuation is obtained. The comparison of simulated results indicated that the multi-mirror Fabry-Prot filter with attenuation could suppress the crosstalk of intra-cavities effectively, improves the transmission of the signal in the passband, and increase the utilization of the signal consequently. The relation of transmission with different attenuation is discussed primary, and also discussing the relationship of the value of peak transmission and the secondary peak transmission. Simulating by TFC approved the result. At last the method of increasing the reflection of mirrors to reduce attenuation is put forward for the sake of reducing the cost of the system. And the feasibility of the method is demonstrated by matrix calculation.

关 键 词：应用光学 密集波分复用 多镜理论 法布里-珀罗滤波器 多腔 衰减 

分 类 号：TB851.7[一般工业技术—摄影技术]