光子辅助信道化的超宽带射频信号传输、处理和接收技术

Ultra-broadband RF signal transmission, processing and receiving are needed by the radar, electronic countermeasure, communication, navigation and recognition. At the same time, the need also challenges the current.electronic technology hugely. Due to the advantages, such as broadband, low attenuation, parallel processing, photonics technology becomes the idea low SWaP (size, weight and power consumption) platform for the new generation system of ultra-wideband radio frequency processing. The current optical-carried ultra-broadband RF system has to face the poor integration between the wide and coarse photonic bandwidth and narrow and fine electronic bandwidth as well as the lack of integration design of each module. The project researches the photonic assisted channelized ultra wideband RF technology. The technology makes the use of high coherent optical frequency comb and combines the advantages of photonics technology.and electronic technology, which solves the current difficulty of superfine controlling broadband optical spectrum in the field of microwave photonics and realizes the integration between real-time sensing broadband RF signal and digital receiving. Besides, the project will also research the nonlinearity in multi-carriers RF optical link deeply. The research will pave the way for future ultra-wideband RF signal transmission, processing and receiving, and realize the prototype system of the photonic assisted channelized Ultra-wideband RF receiver.

超宽带射频信号的传输、处理和接收在雷达、电子对抗、通信导航识别等军民应用中具有重大需求，也使当前电子技术面临巨大挑战。宽带、低损、并行处理等特性，使光子技术成为新一代面向超宽带射频处理系统的低SWaP（体积、重量和功耗）的理想平台。当前光载超宽带射频系统在高动态链路、宽带实时感知、数字化接收等核心功能上，面临着宽且粗粒的光子带宽和窄且精细的电子带宽仍未有效融合、各个组块缺乏一体设计等问题。本项目拟研究光子辅助信道化的超宽带射频技术，利用高相干性光频率梳这一新型光源，充分结合现有光子和电子的优势技术，解决宽带光谱超精细控制这一微波光子学的当前难题，实现超宽带射频的实时感知和数字接收一体化；项目同时也将对多载波射频光链路的多源非线性进行深入研究。通过上述研究实现光子辅助信道化的超宽带射频接收原型系统，并将为未来超宽带射频信号的传输、处理和接收奠定基础。

本项目面向未来电子对抗侦查中、超宽带射频信号的接收等应用，着重研究了利用光子技术对超宽带信号进行频谱精细划分、以及并行的进行高动态数字化接收等科学问题。围绕超宽带射频频谱的精细划分，项目提出了基于高相干性双光学频率梳和IQ数字相干解调的“多超外差”接收技术；围绕光频率梳的产生，提出了全线性腔的“线性耗散孤子”技术；围绕超宽带、多载波的射频注入环境，提出了基于数字后处理的“多源非线性共同补偿”技术。项目搭建了基于双光学频率梳的超宽带射频信道化接收原理样机，实现了项目的预期指标：可实现工作带宽覆盖0~18 GHz，瞬时接收带宽5 GHz，信道数目为10，单信道接收带宽500 MHz；接收信号频率误差在1 MHz以内，动态范围大于100 dBHz2/3；相同的装置也可实现DC-20 GHz范围内的频谱感知，将整个射频谱划分为20个信道，每个信道的接收带宽为1 GHz，则瞬时接收带宽为20 GHz，测频精度在MHz内，信噪比均值64 dB,信道频率响应具有良好的均衡性，各信道的无杂散动态范围均值优于95 dB•Hz2/3。.项目执行期间发表SCI文章29篇，其中影响因子大于2.0的文章22篇， OSA期刊第一作者特邀论文1篇；发表国际会议报告29篇；国际会议特邀报告4篇，其中包括2013年在亚太微波光子学年会（APMP2013，韩国）上做大会报告，成为微波光子学领域首位获邀在国际性微波光子学大会上做大会报告的中国学者，2015年在欧洲微波大会（EuMC2015，法国）上做特邀报告；申请国家发明专利6项。项目负责人获得2016年国家自然科学杰出青年基金项目资助，项目主要参与人员获得2013年新世纪优秀人才支持计划。