SDN controller in optical network and physical damage perception RSA method

Abstract

The invention provides a SDN controller in an optical network and a physical damage perception RSA method and relates to the optical communication technology field. A damage assessment module is introduced into the SDN controller and a Match Fields rule of a flow entry of a SDN controller south bound interface OpenFlow protocol is expanded. The physical damage perception RSA method comprises the following steps that a service request arriving at the optical network is sent to a flow analyzer; the flow analyzer acquires current network state information; a path calculating module calculates K optical paths for the request according to a current network state; the K optical paths are sent to the damage assessment module to carry out physical layer damage assessment, an optical path resource satisfying a QoT requirement is selected and connection is established. In the invention, physical layer damages are comprehensively considered; after routing and a frequency spectrum distribution process are performed for the service, quality determination of signal transmission is performed so that QoT is guaranteed.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an SDN controller in a software-defined optical network and a physical damage-aware routing and spectrum allocation (RSA) method. Background technique [0002] With the transparent transmission of optical signals in all-optical networks, optical-electrical-optical (OEO) converters gradually withdraw from the core nodes of optical networks. Due to the absence of regenerative devices, irrational devices and equipment in the optical domain, such as optical cross-connectors (OXC), erbium-doped fiber amplifiers (EDFA), etc., produce linear physical damage such as dispersion, noise and power loss, and nonlinear physical damage between signals. The degradation of the optical signal quality by damage will reduce the quality of transmission (QoT) of the optical signal; and this degradation will continue to accumulate along the optical path, eventually leading to an increase ...

AI Technical Summary

Problems solved by technology

However, this method of avoiding physical layer damage will occupy additional spectrum resources, resulting in reduced resource utilization

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