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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。
The multi-cavity Fabry-Perot filter is a key component in fiber-optic communication. The effect of attenuation on the performance of the device is discussed in order to improve the spectral performance of the device. Using multi-mirror theory, two different methods are used to derive the transmission matrix algorithm for introducing signal attenuation in multi-cavity cascaded Fabry-Perot filters. Taking the three-cavity Fabry-Perot filter as an example, numerical simulation shows that when the attenuation is introduced, it can effectively suppress the internal crosstalk in the multi-cavity Fabry-Perot device and improve the signal transmission in the passband. Passband signal utilization. Through the calculation of device transmittance with different attenuation, the relationship between transmittance and attenuation coefficient and the relative relationship between the sub-peak and the main peak at different attenuation are compared and discussed in detail. Simultaneously, it is verified by the thin film design software TFC. The accuracy of the results. Finally, in order to minimize the loss of the system due to the introduction of attenuation, a method of reducing the attenuation coefficient is proposed, that is, the reflectance of the reflector is increased, and the feasibility of the matrix operation is proved.