Method and device for optimizing dynamic transmission performance in wavelength switched optical network

Abstract

The invention provides a method and a device for optimizing dynamic transmission performance in a wavelength switched optical network. The method comprises the following steps of: making the optical signal-to-noise ratio cost of a dispersion-optimized optical path and the accumulative nonlinear phase shift have a one-to-one correspondence relationship by carrying out pre-dispersion compensation and post-dispersion compensation on source and destination nodes of an optical path; then, obtaining the optical signal-to-noise ratio cost of the optical path, using the power regulating quantity of a power-regulating point as a variable, by using the correspondence relationship, further setting a target function according to the optical signal-to-noise ratio cost and the optical signal-to-noise ratio of the optical path, and optimizing according to a predetermined optimization target and constraint conditions to obtain a node needing power regulation and the power regulating quantity of the same. According to the invention, the transmission performance of the optical path can be improved, and the blockage of physical layers, caused by the substandard physical transmission performance, is avoided.

Description

Technical field [0001] The invention relates to a wavelength switched optical network (WSON), in particular to a method and a device for optimizing dynamic transmission performance in the wavelength switched optical network. Background technique [0002] The flexible and transparent WSON is an important direction for the development and evolution of the transport network. The use of General Multi-Protocol Label Switching (GMPLS) technology can construct a distributed intelligent control plane, realize the rapid establishment and removal of connections, support dynamic and flexible service configuration and high-efficiency resource optimization capabilities. Various reconfigurable optical add / drop multiplexers (ROADM) and adjustable devices (adjustable dispersion compensator, adjustable attenuator, adjustable amplifier) ​​with all-optical wavelength switching capabilities have begun to be applied on a large scale, for optical signals Transparent transmission in the entire network...

AI Technical Summary

Problems solved by technology

In this way, even if the optimized OSNR and nonlinear phase shift meet the requirements, the final Q factor or bit error rate still cannot meet the requirements for normal transmission of the optical path, causing greater system performance degradation and higher error rates. Bit rate, causing physical layer blocking of the optical path due to substandard physical transmission performance

[0010] 3. When it is assumed that the power of the optical signal entering each section of the transmission fiber in the optical path is the same, although there are some optimal configuration methods about the input power of the optical path, these methods are all based on the power configuration of the static optical path of the point-to-point connection , and cannot be directly used in dynamic and flexible WSON networks

However, the dynamic adjustment of the residual dispersion of each section in the optical transmission will affect the accuracy of nonlinear effect evaluation of nonlinear phase shift, especially the evaluation of cross-phase modulation (XPM) and four-wave mixing (FWM) have a serious impact

Therefore, adjusting the amount of dispersion compensation at intermediate nodes or all nodes will affect the accuracy of nonlinear effect evaluation, thus making performance optimization adjustment uncertain

In addition, since each node can adjust the amount of dispersion compensation, it is necessary to configure an adjustable dispersion compensator at each intermediate node, thereby increasing the construction investment and operation and maintenance costs of the network

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