OFDM技术在光纤通信系统中的研究

发布时间：2018-03-12 15:55

本文选题：正交频分复用　切入点：光纤通信　出处：《长春理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：基于OFDM的光纤通信系统具有光通信和OFDM技术的双重优点,光OFDM技术不但具有较高的频谱利用率,而且还具有较强的抗非线性能力、抗偏振模色散的能力和抗色度色散的能力。光OFDM技术是大容量、高速率和超长距离的光纤通信系统中的关键技术,所以光OFDM技术是当前的研究热点。本文主要研究了直接检测光OFDM (DDO-OFDM)系统、相干检测光OFDM (CO-OFDM)系统和偏振复用相干检测光OFDM (PDM-CO-OFDM)系统的发射机与接收机的原理、结构和相关技术,分析了光纤信道的传输特性,利用Optisystem和Matlab搭建了DDO-OFDM系统、CO-OFDM系统和PDM-CO-OFDM系统仿真平台；在DDO-OFDM系统中,分析了不同色散系数对传输距离的影响和不同子载波数对系统性能的影响。为了提高DDO-OFDM系统的接收机灵敏度,设计了CO-OFDM系统,在CO-OFDM系统中,对不同子载波数目、不同调制模式和不同差分群时延(DGD)对系统性能的影响进行仿真分析。为了增大系统容量,将偏振复用技术引入到了CO-OFDM系统当中,在PDM-CO-OFDM系统中,对适当选取子载波数和调制方式可以使PDM-CO-OFDM系统的性能非常优越进行仿真与分析；最后对单偏振CO-OFDM系统和PDM-CO-OFDM系统的仿真结果进行对比分析。
[Abstract]:Optical fiber communication system based on OFDM has the dual advantages of optical communication and OFDM technology. Optical OFDM technology not only has high spectral efficiency, but also has strong anti-nonlinear ability. Optical OFDM technology is a key technology in large capacity, high speed and super long distance optical fiber communication systems, so optical OFDM technology is a hot research topic at present. In this paper, the principle, structure and related techniques of transmitters and receivers of direct detection optical OFDM DDO-OFDM system, coherent detection optical OFDM CO-OFDM system and polarization-multiplexed coherent detection optical OFDM PDM-CO-OFDM system are studied, and the transmission characteristics of optical fiber channel are analyzed. The simulation platform of DDO-OFDM system, CO-OFDM system and PDM-CO-OFDM system is built by using Optisystem and Matlab. In DDO-OFDM system, the influence of different dispersion coefficients on transmission distance and the influence of different number of sub-carriers on system performance are analyzed. A CO-OFDM system is designed. In CO-OFDM system, the effects of different subcarriers, different modulation modes and different differential group delay on the performance of the system are simulated and analyzed. Polarization multiplexing technology is introduced into CO-OFDM system. In PDM-CO-OFDM system, the performance of PDM-CO-OFDM system can be simulated and analyzed by selecting the proper number of sub-carriers and modulation mode. Finally, the simulation results of single polarization CO-OFDM system and PDM-CO-OFDM system are compared and analyzed.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.11

【参考文献】