光通信系统中的光信号编解码技术研究

发布时间：2018-09-17 10:27

【摘要】：近几年来随着多媒体业务、网络业务和宽带综合业务数字网的快速发展,全光通信已经成为光通信发展的目标,为提高光通信系统容量与传输性能相继提出OCDMA光码分多址(Optical Code Division Multiple Access)概念。论文主要对非相干OCDMA系统进行深入研究和仿真分析。论文首先调研了光通信发展的研究现状及几种主流的复用及寻址技术,对光波分复用OWDM(Optical Wavelength Division Multiplexing)、光时分复用OTDM(Optical Time Division Multiplexing)、OCDMA技术的特性进行了分析与对比,综述了OCDMA系统实验及编解码技术的研究现状。论文针对非相干OCDMA编解码系统进行了理论分析,通过仿真软件OptiSystem搭建了基于光纤延迟线、光纤布拉格光栅以及将两者结合的二维非相干OCDMA通信传输系统,并对三类系统进行仿真与实验研究,实现了两用户速率为4Gbit/s的数据传输。仿真结果表明:基于光纤延迟线和光纤布拉格光栅的一维系统误码率更低,二维系统用户容量更大,保密性更高。为提高系统性能,论文研究了光纤布拉格光栅反射谱谱宽及波长选择对非相干OCDMA系统性能的影响。根据仿真实验的结论,利用光纤布拉格光栅的温度特性,在OptiGrating软件上设计出适用于二维非相干OCDMA系统的可调谐光纤布拉格光栅,实现编解码的灵活可调。
[Abstract]:In recent years, with the rapid development of multimedia services, network services and broadband integrated services digital network, all-optical communication has become the goal of optical communication development. In order to improve the capacity and transmission performance of optical communication systems, the concept of OCDMA optical code division multiple access (Optical Code Division Multiple Access) is proposed one after another. In this paper, the incoherent OCDMA system is studied and simulated. Firstly, this paper investigates the research status of optical communication and several mainstream multiplexing and addressing technologies, and analyzes and compares the characteristics of optical wavelength division multiplexing (OWDM (Optical Wavelength Division Multiplexing),) optical time division multiplexing (OTDM) OTDM (Optical Time Division Multiplexing) / OCDMA technology. This paper summarizes the research status of OCDMA system experiment and codec technology. In this paper, the incoherent OCDMA coding and decoding system is analyzed theoretically, and the transmission system based on fiber delay line, fiber Bragg grating and two-dimensional incoherent OCDMA communication is built by simulation software OptiSystem. The simulation and experiment of three kinds of systems are carried out to realize the data transmission with two user rates of 4Gbit/s. The simulation results show that the BER of one-dimensional system based on fiber delay line and fiber Bragg grating is lower, the user capacity of two-dimensional system is larger and the security is higher. In order to improve the performance of fiber Bragg grating (FBG), the influence of spectrum width and wavelength selection on the performance of incoherent OCDMA system is studied. According to the conclusion of simulation experiment, using the temperature characteristic of fiber Bragg grating, a tunable fiber Bragg grating suitable for two-dimensional incoherent OCDMA system is designed on OptiGrating software.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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