大气—海洋混合信道中部分相干涡旋光束抑制湍流负面效应研究

轨道角动量(OAM)复用技术为无线光通信提供了新的复用形式，可作为提高系统信道容量的创新途径。探索复杂介质中涡旋光束的传输机理是OAM复用技术的关键科学问题之一。另外，“空天地海”一体化的技术倡导使研究光束从大气到海洋的跨介质传输问题成为未来光通信技术的一个发展方向。因此，本项目首先针对上层海洋—底层大气链路构建问题，建立大气—海洋混合信道的湍流功率谱模型；其次，以具有抑制湍流效应优势的部分相干涡旋光束为研究对象，探索部分相干涡旋光束在大气—海洋混合湍流中的传输机理，研究光源和大气—海洋混合湍流若干因素对其传输特性的影响并揭示物理机理；最后，从OAM模式的弥散和串扰角度，分析基于部分相干涡旋光束的OAM复用系统误码率和信道容量的优势。本项目的研究为开展上层海洋-底层大气链路上信息传输提供了系统的理论模型，并为近海面无线光通信、水下探测等领域提供了可靠的理论依据和技术支持。

Orbital Angular Momentum (OAM) technology provides a new form of multiplexing for free space optical (FSO) communications, and can be used as an innovative way to increase the system channel capacity. Exploring the propagation mechanism of vortex beams in complex random media is one of the key scientific issues of OAM multiplexing technology. In addition, the technical advocacy of the future “space-air-ground-ocean” integration makes the study of the cross-medium propagation of light beams from the atmosphere to the ocean a development direction of future optical communication technology. Therefore, firstly, this project aims to establish the power spectrum model of the atmosphere-ocean mixed turbulence (AOMT) to solve the problem of the construction of the surface ocean-low atmosphere link. Secondly, taking the partially coherent vortex beam with the advantage of suppressing the turbulence effect as the research object, explore the propagation mechanism of the partially coherent vortex beam in the atmosphere-ocean mixed turbulence, study the influence of several factors of the light source and AOMT on the propagation properties of partially coherent vortex beams and reveal its physical mechanism. Finally, from the perspective of OAM mode dispersion and crosstalk, the advantages of OAM multiplexing communication system based on partially coherent vortex beams in terms of bit error rate and channel capacity are analyzed. The research results of this project provide a systematic theoretical model for information transmission on the surface ocean-low atmosphere link, and provide reliable theoretical basis and technical support for the fields of FSO communication in the surface ocean environment and underwater target detection.