光子学报, 2015, 44 (5): 0523001, 网络出版: 2015-05-26
高Q值跳频带通微波光子滤波器
The Frequency Hopping Bandpass Microwave Photonic Filter with High Q-factor
高品质因数 跳频 波长间隔 微波光子滤波器 High Q factor Frequency hopping Wavelength separation Microwave photonic filter
摘要
提出一种基于Lyot-Sagnac滤波器和级联结构的高品质因数跳频带通微波光子滤波器.在该滤波系统中, 利用宽带光源和Loyt-Sagnac滤波器原理实现波长间隔可变的连续光载波.利用相位调制器与单模光纤形成第一级单通带微波光子滤波器, 光纤环形谐振器作为第二级滤波结构.经两级滤波器级联, 实现高品质因数跳频单通带微波光子滤波器.在使用三段保偏光纤的情况下, 通过调整偏振控制器的偏振状态, 可实现滤波器中心频率在1.012 1 GHz, 1.214 5 GHz, 1.416 9 GHz, 1.619 3 GHz, 1.821 7 GHz之间跳跃.由于采用了级联结构, 所设计的滤波器继承了前后两级滤波器的共同优点, 故滤波器的滤波特性良好, 品质因数最高可达13 155.69; 主旁瓣抑制比均在18 dB以上, 最高达25.51 dB.且该装置结构简单, 调谐便利.
Abstract
A frequency hopping bandpass microwave photonic filter based on Lyot-sagnac filter and cascaded structure was proposed. In the filtering system, a continuous optical source with variable wavelength separation is achieved by using broadband source and Loyt-sagnac filter. The first order filter is composed of a phase modulator and a signal mode fiber. A ring resonator is cascaded to be the second order filtering structure. A frequency hopping single-bandpass microwave photonic filter with high Q-factor is achieved by cascading the two filters. In the case of choosing three sections of polarization maintaining fiber, the central frequency of the filter is hopped among 1.012 1 GHz, 1.214 5 GHz, 1.416 9 GHz, 1.619 3 GHz and 1.821 7 GHz by adjusting the polarization state of polarization controller. Since a cascaded structure is used in this article, the implementation of the filter inherited advantage of both filters. So the filter has good frequency response. The highest Q-factor is 13 155.69. Main side lobe suppression radio varies from 18 dB to 25.51 dB. Besides, the device has simple structure and is easy to control.
张爱玲, 黄聪, 潘洪刚, 曹晔, 刘策. 高Q值跳频带通微波光子滤波器[J]. 光子学报, 2015, 44(5): 0523001. ZHANG Ai-ling, HUANG Cong, PAN Hong-gang, CAO Ye, LIU Ce. The Frequency Hopping Bandpass Microwave Photonic Filter with High Q-factor[J]. ACTA PHOTONICA SINICA, 2015, 44(5): 0523001.