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提出并实验验证了基于单模光纤基模和包层LP11模干涉耦合的可调谐光纤声光梳状滤波器,该滤波器采用普通单模光纤,通过刻蚀形成不同外径的三段光纤级联结构,通过声波调节实现调谐。说明了滤波器的结构和工作原理;并通过计算和实验结果具体说明梳状滤波谱带宽主要取决于发生声光耦合的第一、三段光纤的外径,而滤波峰间隔主要取决于用作传输的第二段光纤的长度;最后分析指出影响器件消光比的主要因素是声波的衰减和反射,优化第一、三段光纤的长度比例和采用渐变过渡的措施减小光纤外径的突变可望进一步提高器件的性能。
A tunable fiber-optic acousto-optical comb filter based on single-mode optical fiber fundamental mode and cladding LP11 mode interference coupling is proposed and experimentally verified. The filter uses ordinary single-mode optical fiber and forms three-stage optical fiber stages with different outer diameters by etching Joint structure, through the acoustic adjustment to achieve tuning. The structure and working principle of the filter are described. The bandwidth of the comb filter spectrum is mainly determined by the calculation and experiment results. The filter peak interval mainly depends on the outer diameter of the first and third optical fiber in which the acousto-optic coupling occurs. Finally, it is pointed out that the main factors affecting the extinction ratio of the device are attenuation and reflection of the acoustic wave, optimizing the ratio of the length of the first and the third sections of the optical fiber, and reducing the outer diameter of the optical fiber by using the gradual transition Hope to further improve the performance of the device.