基于高双折射光子晶体光纤和无限脉冲响应的微波光子滤波器

A Tunable and Reconfigurable of Microwave Photonic Filter Based on HB-PCF and Infinite Impulse Response

提出了1种基于高双折射光子晶体光纤和无限脉冲响应(IIR)的可调谐可重构微波光子滤波器(MPF).向高双折射光子晶体光纤(HB-PCF)的1个大空气孔中填充温敏液体,调节温度,改变HB-PCF的双折射,使激光器产生不同波长间隔的激光,从而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20-80℃时,仿真测得,FSR的变化范围为12.145-23.277 GHz.在有限脉冲响应(FIR)滤波器中引入电反馈,构成IIR滤波器,使得MPF的3 d B带宽减小,主旁瓣抑制比(MSSR)增加,其通带特性得到了改善.通过调节射频信号放大器的增益,可以改变滤波器的频率响应形状,实现滤波器的可重构特性.

A tunable and reconfigurable of microwave photonic filter（MPF） based on HB-PCF and infinite impulse response（IIR） is proposed. One of a big air hole of HB-PCF filling with temperature-sensitive liquid, adjusting temperature could change the birefringence of HB-PCF, then the laser produces lasing with different wavelength space, the filter will obtain different free spectral range（FSR）, implementing the continuality tenability. When the temperature range is 20-80℃, the stimulated result shows that the FSR range is 12.145-23.277 GHz. An electrical feedback infinite impulse response（IIR） filter is introduced, based on a finite impulse response（FIR） filter. Thus the 3 d B bandwidth is reduced, and the main side-lobe suppression ratio（MSSR） is increased, and the passband characteristic is improved. By adjusting the gain of the RF signal amplifier, the frequency response of the filter can be changed, and the reconfigurability of the filter can be realized.