基于保偏光纤双折射特性的函数波形发生器  

Function Waveform Generator Based on Birefringence Characteristics of Polarization-Maintaining Fiber

作　　者：燕苗霞 李晶[1] 裴丽[1] 宁提纲[1] 郑晶晶[1] 王建帅[1] 王创业 Yan Miaoxia;Li Jing;Pei Li;Ning Tigang;Zheng Jingjing;Wang Jianshuai;Wang Chuangye(Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044)

机构地区：[1]北京交通大学光波技术研究所,北京100044

出　　处：《光学学报》2023年第1期15-22,共8页Acta Optica Sinica

基　　金：中央高校基本科研业务费专项资金(2022JBMC004);国家重点研发计划(2019YFB2204003)。

摘　　要：提出并研究了一种基于保偏光纤双折射特性的函数波形信号发生器。发生器采用正弦微波信号调制连续光波,光波经45°偏振控制后耦合进入保偏光纤,利用光纤双折射特性在快慢轴两个正交光场分量间引入可控时延差,经光电检测后的光电流表达式可由傅里叶级数余弦谐波项构成,结合宽带90°电桥亦可获得傅里叶级数正弦谐波项构成,因此模型具备可调谐函数波形输出特性。分析结果表明,通过控制发生器三个变量,即偏压相移φ、调制系数β和时延差τ,可对傅里叶级数各谐波系数进行灵活调控。分析并讨论了各变量之间的关系,利用光学仿真验证了方案的可行性。当限定均方根误差(RMSE)≤5%,可获得0~30%可调顶边梯形波和20%~80%可调对称三角波。Objective In recent years, people′s demands for massive information transmission and processing are increasing, which leads to technological innovation and development in satellite communication, radars, electronic military affairs,broadband wireless communication, and other fields. As a carrier of information, the high-frequency microwave signal is an inevitable development trend. In practical applications, there is a great demand not only for high-frequency microwave signals but also for microwave signal waveforms in radars, software radio, modern instruments, testing, and other fields.For example, triangle wave signals in radars can be generated by triangle waves, which can be used for range and velocity measurement of multiple targets by radar systems, and the signals can be combined with cross-phase modulation and be used for optical frequency conversion and pulse compression. Square waves can be used to form false target interference to pulse compression radars. Therefore, the realization of multi-waveform online flexible and adjustable waves becomes a future development trend. However, traditional electronic systems are faced with problems such as electronic bottlenecks,high complexity, large volume and weight, and poor flexibility, and they are easy to be affected by electromagnetic interference and will produce electromagnetic radiation. Nowadays, radars, satellite communication, and other systems tend to move towards multifunctional integration, which requires large working bandwidth, large capacity, flexible waveform generation, high carrier frequency stability, flexible tuning, and multi-channel and dynamic resource allocation,which cannot be realized by traditional electronic systems. Therefore, it is important for our research to explore efficient methods to generate high-frequency and high-quality microwave local oscillator signals and arbitrary waveform signals with a high-frequency bandwidth.Methods A function waveform signal generator based on birefringence characteristics of a polarization-ma

关 键 词：光纤光学 保偏光纤 双折射特性 傅里叶级数 可调顶边梯形波 可调对称三角波 

分 类 号：O436[机械工程—光学工程]