非线性链路宽带微波光子信号可调控传输研究

闫连山

摘 要：微波光子技术涉及微波信号产生、传输、控制和处理等，在军事和民用领域有着重要的作用。尤其是，低噪声、大动态范围、精细可调控的微波光子链路的实现具有重大理论意义和应用价值。主要围绕宽带微波光子信号传输理论与机制等研究方向，从链路非线性、信号的调控方式与手段、新型编码与传输机制等几个方面开展理论和技术问题的研究。具体包括：研究实际非线性链路理论传输极限与链路和关键器件参数之间的关系；研究能够提高频谱效率、传输距离或容量的新型传输机理或编码方式；研究保持高信噪比的大动态范围信号调谐方式；研究面向动态重构和泛在接入的高精细链路频谱操控方法；研究在线性能监测与自适应补偿的链路优化技术。在研究过程中，主要采用的方式为：首先建立系统性和完善的非线性链路传输理论；其次引入新型编码方式与传输机制；最后突出频谱操控与自适应补偿技术重要性。目前主要获得了以下五个方面的进展：（1）微波光子链路非线性理论模型的建立和仿真软件的开发；（2）光纤链路非线性效应实验研究及应用；（3）微波光子链路色散和非线性补偿；（4）微波信号光学调控与监控的研究；（5）MIMO传输与轨道交通光无线网络示范。

关键词：微波光子 非线性 可调控 链路优化

Abstract：Microwave photonics has been widely used in the fields of civil and military， including the generation， the transmission， the manipulation and the processing microwave signals using photonic technology. In particular， the microwave photonic links with low noise figure， large spur-free dynamic range （SFDR）， and fine tenability are of great significance both in theory and in practical applications. This subject mainly focuses on the transmission theory of broadband microwave photonic signals， such as link nonlinearity， signal manipulation， new coding and transmission mechanism， etc. More specifically， the contents are listed as follows： （1）the relationship between theoretical transmission limit of the nonlinear link and parameters of the key components； （2）the novel transmission mechanism or coding technology to improve the spectral efficiency， the transmission distance and the capacity； （3）the signal tenability technology with high signal-to-noise ratio （SNR） and large dynamic range； （4）the high-accuracy frequency manipulation schemes for reconfigurable and ubiquitous access； （5）the link optimization technology based on performance monitoring and adaptive compensation. We start from establishing a complete nonlinear transmission theory. Then novel coding methods and transmission mechanisms are introduced. Finally， the frequency manipulation and adaptive compensation techniques are highlighted. Up to now， five significant advances in this project have been reported， including； （1）the development of nonlinear theoretical model and the software for microwave photonic links； （2）the experimental investigations of the optical link nonlinearity and applications； （3）the chromatic and nonlinearity compensation of the microwave photonic link； （4）the photonic tuning and monitoring of the microwave signals； （5）the MIMO transmission system and the photonics-based wireless network demonstration system for rail applications.

Key Words：Microwave photonic； Nonlinearity； Tenability； Link optimization

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