PDM-QAM高速光传输系统性能的研究

发布时间：2018-06-02 19:07

本文选题：正交振幅调制 + 偏振复用　；参考：《电子科技大学》2017年硕士论文

【摘要】：光纤通信技术在过去的三十年间极大地改变了人们的生活。虽然整个光通信行业因为2000年互联网泡沫的破灭受到了影响,但近年来由于高清电视、移动多媒体、大数据、云计算和社交网络的兴盛,互联网对通信网络传输带宽的需求达到了前所未有的高度,进而推动了光通信行业的再一次兴盛。高速率的光纤传输技术是研究者追求的主要方向。借此希望能够满足人们对信息的需求。本论文主要研究了高速的光纤传输系统的性能,分析了正交振幅调制和偏振复用的原理。利用光学仿真软件VPI transmission maker 8.3搭建了200 Gbit/s、320Gbit/s、500 Gbit/s的16QAM和64QAM的偏振复用的光纤传输系统模型,研究和优化了这两种系统。本论文的主要内容包括:(1)综述了正交振幅调制和偏振复用的现状和发展趋势。介绍了光调制技术的原理,主要介绍了MZ调制器。对正交振幅调制技术进行了详细的分析,接着分析了正交振幅调制的解调技术,包括直接解调和相干解调,对相干解调进行了公式的推导,详细的分析。介绍了偏振复用技术。首先讲解了光的偏振,然后介绍了几种表示偏振光的方法,有琼斯矩阵方法、斯托克斯矢量法、以及在庞加莱球上各个点代表的偏振光。然后详细分析了光纤中偏振模色散和偏振相关损耗的原理及其对系统的影响。最后介绍了解偏振复用的两种方法,分别是相干解调和直接解调。对相干解调的原理进行了简单的分析。对相干解调的原理及如何实现进行了详细的分析。使用直接解偏振复用技术对信号进行解调,省略了后期DSP对信号的处理,极大的简化了系统。(2)利用上述的理论和分析,通过VPI transmission maker 8.3搭建了200 Gbit/s、320 Gbit/s、500 Gbit/s的16QAM的偏振复用的光纤传输系统模型。仿真系统包括信号的生成也就是发射机,光纤传输链路,信号的解调也就是光接收机。研究系统中的一些参数对信号产生的影响。优化了光纤传输系统的性能。在BER=10-9的条件下,光信噪比以及光接受功率都能满足光纤传输系统的要求。(3)利用VPI transmission maker 8.3搭建了200 Gbit/s、320 Gbit/s、500 Gbit/s的64QAM的偏振复用的光纤传输系统模型。研究了系统中的一些参数对信号产生的影响。优化了光纤传输系统的性能。
[Abstract]:Optical fiber communication technology has greatly changed people's lives in the past 30 years. Although the entire optical communications industry was affected by the dotcom bust in 2000, in recent years, the rise of HDTV, mobile multimedia, big data, cloud computing and social networks, The demand of Internet for communication network bandwidth has reached an unprecedented height, which promotes the optical communication industry to flourish again. High-rate optical fiber transmission technology is the main direction pursued by researchers. In order to meet the information needs of people. In this paper, the performance of high-speed optical fiber transmission system is studied, and the principles of orthogonal amplitude modulation and polarization multiplexing are analyzed. The optical simulation software VPI transmission maker 8.3 is used to build the optical fiber transmission system model of 200Gbit / s320Gbit / s 500 Gbit/s 16QAM and 64QAM polarization multiplexing. The two systems are studied and optimized. The main contents of this thesis include: 1) the current situation and development trend of quadrature amplitude modulation and polarization multiplexing are reviewed. The principle of optical modulation technology is introduced, and the MZ modulator is mainly introduced. The technology of quadrature amplitude modulation is analyzed in detail, and the demodulation technology of quadrature amplitude modulation is analyzed, including direct demodulation and coherent demodulation. The formula of coherent demodulation is deduced and analyzed in detail. Polarization multiplexing technology is introduced. First, the polarization of light is explained, then several methods of representing polarized light are introduced, including Jones matrix method, Stokes vector method, and polarized light represented by each point on the Poincare sphere. Then, the principle of polarization mode dispersion (PMD) and polarization dependent loss in fiber and its influence on the system are analyzed in detail. Finally, two methods to understand polarization multiplexing are introduced, namely coherent demodulation and direct demodulation. The principle of coherent demodulation is simply analyzed. The principle of coherent demodulation and how to realize it are analyzed in detail. Using the direct depolarization multiplexing technique to demodulate the signal, omitting the late processing of the signal by DSP, greatly simplifying the system. The polarization-multiplexing optical fiber transmission system model of 200Gbit / s320Gbit / s ~ (500) Gbit/s 16QAM is built by VPI transmission maker 8.3. The simulation system includes signal generation, optical fiber transmission link, signal demodulation, and optical receiver. The influence of some parameters in the system on the signal production is studied. The performance of optical fiber transmission system is optimized. Under the condition of BER=10-9, the optical signal-to-noise ratio (SNR) and the optical receiving power can meet the requirements of the optical fiber transmission system. (3) using VPI transmission maker 8.3, the polarization multiplexing optical fiber transmission system model of 200Gbit / s ~ (320) Gbit / s ~ (500) Gbit/s 64QAM is built. The influence of some parameters on the signal production is studied. The performance of optical fiber transmission system is optimized.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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