双光纤方向耦合器组成的梳状滤波器  

Comb-filter based on two fiber directional couplers

作　　者：郑玉甫[1] 鲁怀伟[1] 

机构地区：[1]兰州交通大学信息与电气工程学院,甘肃兰州730070

出　　处：《光电工程》2006年第10期56-60,共5页Opto-Electronic Engineering

摘　　要：提出了一种由双光纤定向耦合器组成的光学梳状滤波器,由传输矩阵法推导出了该模型输出光谱与有关参数之间关系的数学表达式,对决定滤波器输出光谱特性及其规律的相关参数进行了详细讨论。模拟与分析表明,在一定条件下,输出光谱半宽度?λ1/2、输出消光比以及波长隔离度等仅与耦合器的耦合比系数有关,具有明显的法布里-珀罗腔多光束干涉的特点,耦合比系数非常类似法布里-珀罗腔中的反射率,通过控制耦合比系数可以调节滤波器的输出光谱半宽度?λ1/2、输出消光比、波长隔离度,已适用不同的应用要求。A new kind of fiber Comb-Filter, using two fiber directional couplers, is proposed. The mathematical expression of the relationship between the output spectra and the relative parameters is deduced out by transmission matrix. The factors, which determine the characteristics of transmission spectrum of the filter, are presented in detail. Simulation and analysis show that on a certain condition the output spectra half width Δλ1/2 , output extinction ratio and wavelength division limit only have relation with couple ratio modulus of the coupler, which obviously has the characteristics of the Fabry-Perot cavity＇s multiple beams interference. The couple ratio modulus is quite similar to the reflection ratio of the Fabry-Perot cavity. By controlling the couple ratio modulus, we can adjust the output spectra half width Δλ1/2, output extinction ratio and wavelength division limit in order to fit the different applied intentions.

关 键 词：应用光学 梳状滤波器 光纤方向耦合器 法布里-珀罗腔 

分 类 号：TN713[电子电信—电路与系统]