基于少模光纤的模分复用系统传输链路关键技术探究
发布时间：2019-01-02 17:39
【摘要】：随着单模光纤传输容量逐渐接近其理论香农极限,寻求新的维度复用技术成为研究者们研究的重点。基于少模光纤的模分复用技术可能是解决通信容量不足的一种方法,通过将少模光纤中每一个传输模式看作一个独立的信道,通信容量会得到成倍的增长。本文就少模光纤传输链路三个关键技术问题展开研究,重点探究了少模光纤的设计问题,少模光纤传输光网络所适用模式交换光开关以及关于少模光纤链路中的色散监测新方法。首先,对少模光纤的设计问题进行探究,找出控制光纤传输模式数目的两个参数:纤芯半径与纤芯包层折射率差,控制这两个参数的值,设计了一种能够传输四个模式的少模光纤。通过理论研究,找出抑制少模光纤非线性的方法,即设计尽可能大有效面积的光纤,并且,采用了外下陷包层的设计,这样可以减少所设计少模光纤的弯曲损耗。所设计的少模光纤具有较大的差模群时延,这样可以使得各个模式信道相对独立,降低接收端信号处理的复杂度。其次,对少模光纤光网络中的模式交换光开关进行了研究。通过实验证明了一种现有的适用于自动交换光网络(ASON)的光开关同样能够对少模光纤中传输的模式群进行整体交换,在此结论的基础上设计集成了一种可重构光网络平台,建立了多模光纤、少模光纤及单模光纤之间的固定连接,以及同类光纤之间的交换连接。演示了在各光节点间IP业务、各光节点间基于TCP/IP协议的高层协议FTP,HTTP和基于HDTV协议的四路高清晰度数字电视的传输,并且通过网络管理软件实现了整个混合传输光网络中的监控。最后,理论分析了少模光纤中一种非线性现象,即四波混频(FWM)效应,推导出了存在两个空间模式时的少模非线性薛定谔方程,得出了少模光纤中形成模间四波混频的模式和波长位置的各种组合以及它们的相位匹配条件。由模间四波混频(IM-FWM)的抑制原理得到启发,提出了一种色散监测方法,该方法可以由FWM产生的闲频波功率来表示链路中色散的大小,具有实时性,简单可靠且灵敏度高。通过仿真软件Optisystem 14.0设计搭建了16QAM少模光纤传输系统,对少模光纤链路进行了色散监测仿真。本文重点研究了以上关于少模光纤传输链路的三个关键技术问题,为以后基于少模光纤的模分复用系统进入大规模应用提供了理论与技术支持。
[Abstract]:With the transmission capacity of single-mode fiber approaching its theoretical Shannon limit, it has become the focus of researchers to seek new dimensional multiplexing technology. The mode division multiplexing technique based on less mode fiber may be a method to solve the problem of insufficient communication capacity. By treating each transmission mode of the optical fiber as an independent channel, the communication capacity will be increased exponentially. In this paper, three key technology problems of low mode optical fiber transmission link are studied, and the design of low mode optical fiber is emphasized. A new method for dispersion monitoring in a low-mode fiber transmission optical network is presented in this paper, which is suitable for mode switching optical switches and a new method for dispersion monitoring in low-mode fiber links. First of all, the design of low-mode optical fiber is studied to find out two parameters that control the number of fiber transmission modes: the difference between the core radius and the refractive index of the core cladding, and the control values of these two parameters. A four-mode optical fiber with four modes is designed. Through theoretical research, a method to reduce the nonlinearity of low-mode fiber is found, that is, to design a fiber with as large an effective area as possible, and to reduce the bending loss of the designed low-mode fiber by adopting the design of outer trapping cladding. The designed low-mode fiber has a large delay of difference mode group, which can make each mode channel relatively independent and reduce the complexity of signal processing at the receiving end. Secondly, the mode-switched optical switch in low-mode optical fiber network is studied. Through experiments, it is proved that an existing optical switch suitable for (ASON) can switch the mode group in optical fiber. Based on this conclusion, a reconfigurable optical network platform is designed and integrated. The fixed connection between multimode fiber, small mode fiber and single mode fiber, and the exchange connection between the same kind of fiber are established. The transmission of IP service between optical nodes, high level protocol FTP,HTTP based on TCP/IP protocol and four-channel HDTV transmission based on HDTV protocol between each optical node is demonstrated. And through the network management software to achieve the entire hybrid transmission optical network monitoring. Finally, a kind of nonlinear phenomenon, the (FWM) effect of four-wave mixing, is analyzed theoretically, and the nonlinear Schrodinger equation with two spatial modes is derived. Various combinations of modes and wavelength positions and their phase matching conditions for the formation of inter-mode four-wave mixing in low-mode optical fiber are obtained. Inspired by the suppression principle of inter-mode four-wave mixing (IM-FWM), a dispersion monitoring method is proposed. This method can represent the dispersion in the link by the idle frequency wave power generated by FWM. The method is real-time, simple, reliable and sensitive. Based on the simulation software Optisystem 14.0, the 16QAM low-mode optical fiber transmission system is designed and built, and dispersion monitoring simulation of the low-mode fiber link is carried out. This paper focuses on the three key technical issues of the low mode optical fiber transmission link, which provides the theoretical and technical support for the large-scale application of the mode division multiplexing system based on the small mode optical fiber in the future.
【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】：TN929.11
本文编号：2398784
[Abstract]:With the transmission capacity of single-mode fiber approaching its theoretical Shannon limit, it has become the focus of researchers to seek new dimensional multiplexing technology. The mode division multiplexing technique based on less mode fiber may be a method to solve the problem of insufficient communication capacity. By treating each transmission mode of the optical fiber as an independent channel, the communication capacity will be increased exponentially. In this paper, three key technology problems of low mode optical fiber transmission link are studied, and the design of low mode optical fiber is emphasized. A new method for dispersion monitoring in a low-mode fiber transmission optical network is presented in this paper, which is suitable for mode switching optical switches and a new method for dispersion monitoring in low-mode fiber links. First of all, the design of low-mode optical fiber is studied to find out two parameters that control the number of fiber transmission modes: the difference between the core radius and the refractive index of the core cladding, and the control values of these two parameters. A four-mode optical fiber with four modes is designed. Through theoretical research, a method to reduce the nonlinearity of low-mode fiber is found, that is, to design a fiber with as large an effective area as possible, and to reduce the bending loss of the designed low-mode fiber by adopting the design of outer trapping cladding. The designed low-mode fiber has a large delay of difference mode group, which can make each mode channel relatively independent and reduce the complexity of signal processing at the receiving end. Secondly, the mode-switched optical switch in low-mode optical fiber network is studied. Through experiments, it is proved that an existing optical switch suitable for (ASON) can switch the mode group in optical fiber. Based on this conclusion, a reconfigurable optical network platform is designed and integrated. The fixed connection between multimode fiber, small mode fiber and single mode fiber, and the exchange connection between the same kind of fiber are established. The transmission of IP service between optical nodes, high level protocol FTP,HTTP based on TCP/IP protocol and four-channel HDTV transmission based on HDTV protocol between each optical node is demonstrated. And through the network management software to achieve the entire hybrid transmission optical network monitoring. Finally, a kind of nonlinear phenomenon, the (FWM) effect of four-wave mixing, is analyzed theoretically, and the nonlinear Schrodinger equation with two spatial modes is derived. Various combinations of modes and wavelength positions and their phase matching conditions for the formation of inter-mode four-wave mixing in low-mode optical fiber are obtained. Inspired by the suppression principle of inter-mode four-wave mixing (IM-FWM), a dispersion monitoring method is proposed. This method can represent the dispersion in the link by the idle frequency wave power generated by FWM. The method is real-time, simple, reliable and sensitive. Based on the simulation software Optisystem 14.0, the 16QAM low-mode optical fiber transmission system is designed and built, and dispersion monitoring simulation of the low-mode fiber link is carried out. This paper focuses on the three key technical issues of the low mode optical fiber transmission link, which provides the theoretical and technical support for the large-scale application of the mode division multiplexing system based on the small mode optical fiber in the future.
【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】：TN929.11
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