基于偏振调制器和单模光纤的微波瞬时频率测量研究  

Research on microwave instantaneous frequency measurement system based on polarization modulator and single mode fiber

作　　者：魏志虎[1,2] 王荣[1] 方涛[1] 蒲涛[1] 郑吉林[1] 孙帼丹[1] 甄飞[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007 [2]南京电讯技术研究所,江苏南京210007

出　　处：《光电子．激光》2013年第12期2328-2331,共4页Journal of Optoelectronics·Laser

基　　金：国家'973'计划(2012CB315603);国家自然科学基金(61032005;61177065;61174199);江苏省自然科学基金(BK2012058)资助项目

摘　　要：提出了一种基于偏振调制器（PolM）实现微波信号的瞬时频率测量（IFM）方法并进行了实验验证。它采用PolM同时实现相位调制和强度调制，利用1个光源和1段单模光纤（SMF）保持光路中功率稳定，通过光纤的色散将微波信号频率映射到功率上，最后经过光电探测器（PD）探测并计算出两路电信号的功率比。这个功率比一一对应于输入的微波信号频率，最终能够测得所输入的微波信号频率。实验结果表明，它不仅可以实现1～12GHz宽带范围内IFM，测量精度可以达到0．2GHZ，而且能够同时保证所测量的微波信号频率的系统误差小，稳定度好。A novel photonic technology for microwave frequency measurement utilizing polarization modulator （Polm） and single mode fiber （SMF） is presented and experimentally demonstrated. Firstly, the phase modulated and intensity modulated signals can be simultaneously generated at the out of the different polarizers. Then,the phase modulated and intensity modulated signals will be transmitted along the same fiber and suffer from the same dispersion of fiber. Owing to the dispersion of fiber,the complementary frequency responses are obtained at the outputs of two paths. An amplitude comparison function （ACF） between the microwave power ratio and the microwave frequency is established. The microwave frequency is estimated by measuring the microwave power of two paths. Moreover,only one laser and SMF are adopted to keep the optical power of two paths relatively stable. The experimental results show that it can not only realize broadband instantaneous frequency measurement in the range from 1 GHz to 12 GHz with a measurement accuracy better than 0.2 GHz, but also reduce the system error of measured microwave frequency. Therefore, the stability is enhanced.

关 键 词：色散 偏振调制器(PolM) 瞬时频率测量(IFM) 微波光子学 

分 类 号：TN929.11[电子电信—通信与信息系统]