MG-ROADM optical node structure and an optical communication signal performance monitoring method in a mode division multiplexing super channel reconfigurable optical network

Abstract

The invention discloses an MG-ROADM optical node structure and an optical communication signal performance monitoring method in a mode division multiplexing super channel reconfigurable optical network. The optical node structure comprises a second-level structured optical node and a third-level structured optical node and has all-optical multi-granularity service exchange and uplink and downlinkchannels, all-optical multi-granularity services refer to optical fiber-level, mode-level and wavelength-level granularity services, and the optical nodes of the two structures further have the functions of all-optical multi-granularity traffic dispersion, all-optical multi-granularity service convergence and mode conversion. According to the invention, the demultiplexing structure in the opticalnode structure is skillfully utilized; the constellation diagram test unit or the eye diagram test unit is directly used for analyzing the performance of the optical signal; Degradation reasons of thechannel signal are known by investigating characteristics of the eye diagram and the constellation diagram, various optical performance degradation can be identified, and the method is suitable for the dynamic routing technology of the next generation of mode division multiplexing super channel optical network, and does not need a historical path of the monitored optical signal. According to themethod, monitoring is carried out on a physical layer, and an optical data signal protocol and a code rate can be transparent.

Description

technical field [0001] The invention relates to the technical field of high-speed and large-capacity optical communication systems and optical communication performance monitoring. Background technique [0002] In the future, optical communication technology will develop towards new ultra-high-speed, ultra-large capacity and ultra-long-distance optical transmission mechanisms and modes. High-speed and large-capacity optical transmission, as a new optical communication mode to promote the development and technological progress of the next generation Internet and broadband mobile communication network, has become the focus and commanding height of international high-tech intellectual property competition. At present, optical fiber space division multiplexing technology (SDM) is combined with various advanced modulation methods (ultra-high speed OTDM (optical time division multiplexing), m-QAM (orthogonal amplitude modulation), OFDM (orthogonal frequency division modulation, et...

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Problems solved by technology

[0003] However, this scheme also presents new problems in the application process. The mode layer introduced in the new mode division multiplexing network not only increases the communication capacity, but also increases the complexity of the system. The topology of the network , the exchange of optical channels, reconfigurable traffic grooming of variable service networks, and multi-granularity exchange reconstruction will face new challenges. In addition, with the increase in the number of modes and the increase in the symbol rate of optical signals in few-mode optical fiber systems, When using efficient modulation methods such as m-QAM and OFDM, compared with single-mode optical fiber systems, nonlinear effects such as four-wave mixing between modes, self-phase modulation, cross-phase modulation, self-steepening effect and stimulated Raman scattering more severely affect the performance of the optical signal

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