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提出了一种结构模型来分析由工艺引起的波导侧壁起伏对于聚合物波导光学梳状滤波器的滤波特性的影响。含氟聚酰亚胺高分子聚合物制备多级马赫曾德尔串联型光学梳状滤波器件的工作参量为中心波长1550 nm,波长间隔为0.8 nm,40通道的波长交错分离。模拟计算表明,对由高分子聚合物材料制备的多级马赫曾德尔串联型光学梳状滤波器件,其主要影响是增大了信道之间的串扰,中心波长1550 nm处的信道串扰由理想情况下的-40 dB降为-12 dB,极大地影响了器件的性能。在此基础上,提出一种改善光学梳状滤波器串扰性能的新结构,该结构由多级马赫曾德尔耦合器和微环共振滤波器串接构成,40个通道的串扰改善为-30 dB以下。
A structural model is proposed to analyze the influence of the waveguide-induced sidewall fluctuations on the filtering characteristics of the polymer waveguide optical comb filter. The working parameters of multistage Mach-Zehnder series optical comb filter fabricated by fluoropolyimide polymer are 1550 nm central wavelength, 0.8 nm wavelength interval and 40 channels wavelength interleaving. The simulation results show that the main effect of multi-stage Mach-Zehnder series optical comb filter made of macromolecule polymer material is to increase the crosstalk between channels. The channel crosstalk at the center wavelength of 1550 nm is caused by the ideal situation -40 dB down to -12 dB, has greatly affected the performance of the device. On this basis, a new structure is proposed to improve the crosstalk performance of the optical comb filter, which consists of a multistage Mach-Zehnder coupler and a micro-loop resonant filter connected in series. The crosstalk of 40 channels is improved to -30 dB the following.