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针对负系数微波光子滤波器很难用正系数的光学抽头来实现,提出了一款基于色散器件级联的可调谐、窄带宽、负系数微波光子滤波器。利用整形后的多波长光纤激光器的输出信号作为滤波器的抽头光源,将单模光纤与F-P光纤环级联作为延迟单元,实现滤波器的频率选择性。利用相位调制器和级联的色散器件共同作用,实现负系数的微波光子滤波器。实验得到了波长间隔为0.34 nm的多达37个激光信号的稳定输出,进而基于此实验结果仿真研究了F-P光纤环中C_2、C_3的耦合系数r、不同长度的可调谐光纤延迟线(TODL)和延迟单元中不同长度的单模光纤等参数对微波光子滤波器性能的影响。
For the negative coefficient of the microwave photonic filter is difficult to achieve with a positive optical tap, a tunable, narrow bandwidth, negative coefficient microwave photonic filter based on cascaded dispersion device is proposed. Using the output signal of the shaped multi-wavelength fiber laser as the tapped light source of the filter, the single-mode fiber is cascaded with the F-P fiber ring as the delay unit to realize the frequency selectivity of the filter. The use of phase modulators and cascaded dispersion devices work together to achieve a negative coefficient of microwave photonic filters. Experimental results show that the stable output of up to 37 laser signals with a wavelength of 0.34 nm is obtained. Based on the experimental results, the coupling coefficient r of C_2 and C_3 in FP optical fiber ring, the tunable fiber delay line (TODL) And delay unit of different lengths of single-mode fiber parameters such as microwave photonic filter performance.