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提出了1种基于波长间隔可调谐多波长激光器和MZ干涉仪的微波光子滤波器.光子晶体光纤(PCF)Sagnac环滤波器具有波长选择的功能,使激光器产生多波长.向PCF的一个大空气孔中填充甘油,调节温度,改变PCF的双折射,能够使激光器产生不同波长间隔的激光.该激光器作为微波光子滤波器的光源,通过连续调节输出激光的波长间隔,可使滤波器具有不同的自由频谱范围(FSR),实现了滤波器的连续可调谐.当温度的变化范围为25-120℃时,仿真测得,FSR的变化范围为2.33-10.54 GHz.此外,通过调节MZ干涉仪两臂的臂长差,改变载波系数,使滤波器通带具有不同的主旁瓣抑制比和3 d B带宽,频率响应形状发生明显变化,实现了滤波器的可重构特性.
A microwave photon filter based on wavelength tunable multi-wavelength laser and MZ interferometer is proposed.Piano crystal fiber (PCF) Sagnac ring filter has the function of wavelength selection, which makes the laser produce multiwavelength.A large air to the PCF The holes are filled with glycerin, the temperature is adjusted and the birefringence of the PCF is changed to enable the laser to generate lasers with different wavelength intervals. As the light source of the microwave photonic filters, the lasers can have different wavelength intervals by continuously adjusting the wavelength spacing of the output lasers The free spectral range (FSR) achieves continuous tunability of the filter.The FSR ranged from 2.33 to 10.54 GHz when the temperature ranged from 25 to 120 ° C. In addition, by adjusting the MZ interferometer two Arm length difference, changing the carrier coefficient, the filter passband has different main sidelobe rejection ratio and 3 d B bandwidth, and the shape of the frequency response changes obviously, and the reconfigurable characteristics of the filter are realized.