新型调制码信号在宽带接入系统中的应用研究

发布时间：2018-02-05 17:46

本文关键词： 光接入网调制全双工眼图 4PAM　出处：《重庆三峡学院》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,以互联网为基础拓展的新兴接入业务促使人们对通信接入带宽的需求日益提升。光纤接入由于其传输容量大,成本低,无电磁辐射等优点而成为宽带接入网中最有潜力的接入技术;但考虑到不同的调制码型格式在传输过程中受到色散和非线性效应影响是不同的,并且相异的调制码型格式直接影响接入系统的频带利用率,因此在光接入系统中合理选择调制码型格式不仅仅是提高收发信号质量的关键因素,也是增加光纤信道传输容量的有效方式。本文首先对当前光接入系统中使用最广泛的无源光接入系统(PON)做了相关介绍;然后解释了使用PON技术的历史发展必然性,描述了 PON系统的一般组成,详细的阐述了 PON的两大主流应用模式—以太网无源光网络(EPON)和吉比特无源光网络(GPON)系统的应用特性。最后对光接入系统中各种关键调制格式的调制解调原理做了说明。本文主要从在发射端应用新型调制码型着手,提出并搭建了不同占空比的归零4进制脉幅调制(RZ-4PAM)光信号接入系统和啁啾归零四进制脉幅调制(CRZ-4PAM)信号接入系统,在分别对不同占空比的RZ-4PAM信号和CRZ信号传输前后的眼图进行对比,并通过分析各自的接收信号的误码率比较了传输性能差异,研究结果证明了 66%RZ-4PAM信号不仅传输距离更远,且频带利用率更高。同时在全双工光接入系统中分别提出采用相关滤波器和偏振复用技术来改进现有的光网络单元(ONU)配置方案,两者在一定程度上都能有效地节约运营成本。而且,仿真实验结果证明,采用偏振复用技术实现ONU无色化的光接入系统中光接入信号的接收质量优于采用滤波器的方案,主要体现在其上行误码率性能更优。
[Abstract]:In recent years, the burgeoning access services based on the Internet promote the increasing demand for the communication access bandwidth. Because of its large transmission capacity and low cost, optical fiber access. Without electromagnetic radiation and other advantages, it has become the most potential access technology in broadband access network; However, considering that different modulation formats are affected by dispersion and nonlinear effects in the transmission process, different modulation formats directly affect the bandwidth efficiency of the access system. Therefore, the reasonable choice of modulation code format is not only the key factor to improve the quality of the transceiver signal in the optical access system. It is also an effective way to increase the transmission capacity of fiber channel. Firstly, this paper introduces the passive optical access system (PON), which is the most widely used optical access system. Then it explains the historical development inevitability of using PON technology and describes the general composition of PON system. The two main application modes of PON, Ethernet passive optical network (EPON) and gigabit passive optical network (GPON), are described in detail. Finally, the principle of modulation and demodulation of various key modulation formats in optical access system is explained. This paper mainly starts with the application of new modulation code in the transmitter. A RZ-4PAM optical signal access system with different duty cycle ratio and a chirped RZ-4PAM signal access system are proposed. The RZ-4PAM signal with different duty cycle and CRZ signal before and after transmission were compared, and the difference of transmission performance was compared by analyzing the bit error rate of each received signal. The results show that the RZ-4PAM signal not only transmits far distance. At the same time, correlation filter and polarization multiplexing technology are used to improve the existing optical network unit (ONUN) configuration in the full duplex optical access system. To a certain extent, both of them can save the operation cost effectively. Moreover, the simulation results show that. The receiving quality of optical access signal in ONU colorless optical access system using polarization multiplexing technique is better than that of filter, which is mainly reflected in the better performance of uplink bit error rate (BER).
【学位授予单位】：重庆三峡学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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