【摘要】 分析了由双光纤定向耦合器组成的梳状滤波器的透射特性。根据传输矩阵,推导出了该滤波器的输出光谱与有关参数之间的关系式。分析结果表明:该滤波器具有法布里_珀罗腔多光束干涉的特点,是一种窄带宽梳状滤波器;耦合器的耦合系数与法布里_珀罗腔中的反射率类似,通过控制耦合系数可以调节滤波器的通带半宽度、消光比、隔离度、输出光强等。更多还原

【Abstract】 The transmission characteristics of all_fiber filter composed of double fiber directional couplers were studied. The mathematical formulations for the relationship between output spectrum and filter parameters were deduced by the transmission matrix. The analytical results show that the filter has the characteristics of multi_beam interference of Fabry_Perot cavity, and it is a narrow_bandwidth comb_filter. Coupling coefficient of the coupler is quite similar to the reflectivity of Fabry_Perot cavity. The half breadth of passband、extinction ratio、wavelength isolation ratio and output power of the filter can be adjusted by changing coupling coefficient.更多还原