A Narrow-Passband and Frequency-Tunable Microwave Photonic Filter Based on Phase-Modulation to Intensity-Modulation Conversion Using a Phase-Shifted Fiber Bragg Grating
A Narrow-Passband and Frequency-Tunable Microwave Photonic Filter Based on Phase-Modulation to Intensity-Modulation Conversion Using a Phase-Shifted Fiber Bragg Grating
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DOI：
10.1109/tmtt.2012.2187678
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发表时间：
2012-05-01
影响因子：
4.3
通讯作者：
Yao, Jianping
中科院分区：
文献类型：
--
作者：
Li, Wangzhe;Li, Ming;Yao, Jianping
提出了一种基于相移光纤布拉格光栅（PS-FBG）相位调制到强度调制转换的窄带可调谐微波光子滤波器（MPF）的实现方法，并进行了实验验证。在所提出的MPF中，相位调制信号被发送到PS-FBG。如果边带之福尔斯落入PS-FBG的陷波中，则相位调制信号被转换为强度调制信号。由于PS-FBG的超窄陷波，实现了超窄通带的微波滤波器。微波滤波器的可调谐性通过调谐光载波的波长来实现。进行了理论分析，其中相移的值和相移的位置在MPF的频率响应的PS-FBG的研究。制作了两个具有不同反射带宽和不同相移值的PS-FBG，并将其纳入建议的MPF中。对于两个PS-FBG，3-dB带宽为120和60 MHz，可调谐范围为5.5和15 GHz。
A novel approach to implementing a narrow-passband and frequency-tunable microwave photonic filter (MPF) based on phase-modulation to intensity-modulation conversion in a phase-shifted fiber Bragg grating (PS-FBG) is proposed and experimentally demonstrated. In the proposed MPF, a phase-modulated signal is sent to a PS-FBG. If one of the sidebands falls in the notch of the PS-FBG, the phase-modulated signal is converted to an intensity-modulated signal. Due to the ultra-narrow notch of the PS-FBG, a microwave filter with an ultra-narrow passband is realized. The tunability of the microwave filter is achieved by tuning the wavelength of the optical carrier. A theoretical analysis is performed in which the value of the phase shift and the location of the phase shift in the PS-FBG on the frequency response of the MPF are studied. Two PS-FBGs with different reflection bandwidths and different phase-shift values introduced at the center of the gratings are fabricated and incorporated into the proposed MPF. For the two PS-FBGs, the 3-dB bandwidths are 120 and 60 MHz and the tunable ranges are 5.5 and 15 GHz.