项目名称： 基于声光互作用动量匹配的相干探测光学降噪方法研究

项目编号： No.61461014

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 何宁

作者单位： 桂林电子科技大学

项目金额： 47万元

中文摘要： 通信信号传输与接收将伴随噪声积累和信噪比恶化，而噪声抑制是系统应用中的技术难题，随着声光技术的发展及在通信系统中的应用，研究弱信号环境下信号接收能力，寻找有效的信号降噪方法具有重要意义。项目运用动量匹配原理和耦合波理论，分析信号相位与稳定光栅建立对声光衍射的影响关系，通过声光互作用机理实现光信号处理，研究通信信号传输中噪声的抑制及信噪比改善，探讨声光器件在相干光探测的重要应用，在传统电通信接收技术基础上，进一步改善通信带宽内降噪问题，探索一种新体制信号接收技术。通过建立系统实验测试平台，进一步分析声光互作用光栅特性与衍射效率关系，研究光学匹配对相干系统输出噪声起伏的影响，探讨声光效应动量匹配的相干探测光学降噪方法和措施，达到提高接收系统光电探测效率的目的，为通信信号降噪处理提供一种新的技术途径。

中文关键词： 通信信号处理；信号调制；声光互作用；光学降噪；相干探测

英文摘要： In transmission and receiver, noise accumulation leads to SNR degradation, while noise suppression is a technical problem in practical application. With the development of the acousto-optic technology and its applications in communication system, looking for an effective method to reduce noise is of great significance for improving receiving ability in weak signal environment. In this project, the impact of signal phase and the stability of built grating on acousto-optic diffraction is analyzed based on momentum matching and coupled wave theory , and then optical signal processing is realized based on acousto-optic interaction, meanwhile noise suppression and SNR improvement in transmission is researched. This project aims to explore a new receiving technique that acousto-optic device is applied to coherent optical detection in order to further reduce noise in communication bandwidth on the basis of traditional electronic communication receiving technology. By the experimental platform established, the relationship between grating characteristics and diffraction efficiency of acousto-optic interaction is further analyzed, moreover, in order to improve the photoelectric detection efficiency of receiving system, the effect of optical match on the fluctuation of output noise in coherent detection system is studied, furthermore the optical de-noising methods and measures in coherent detection is discussed based on the momentum matching of acousto-optic interaction, thus a new technique is provided for de-noising processing in communications.

英文关键词： signal processing for communications;signal modulation;Acousto-optic interaction;Optic noise reduction;Coherent optical detection