OSNR (Optical Signal to Noise Ratio) sensing spectrum allocation method and system under optical channel performance guarantee

Abstract

The invention relates to an OSNR (Optical Signal to Noise Ratio) sensing spectrum allocation method and system under optical channel performance guarantee. The method comprises the following steps: constructing an OSNR evaluation model; obtaining a shortest path between the source node and the target node; obtaining a plurality of modulation formats and corresponding thresholds thereof, sorting the plurality of modulation formats from high to low according to the spectrum efficiency, and obtaining a sorted modulation format list; calculating the bandwidth required by the optical path service based on the bandwidth requirement and the FEC overhead by using the modulation format with the highest spectrum efficiency; substituting the bandwidth required by the optical path service into the OSNR evaluation model to obtain the FS number actually required by the service; and allocating spectrum resources required by the current service to the shortest path by using a first-time adaptation algorithm, and obtaining the center frequency of the current service on the optical path. The cascade effect of the reconfigurable optical add drop multiplexer is considered, an optical path signal-to-noise ratio estimation model is provided, and the optical path signal-to-noise ratio estimation method has important significance for guiding the use of low-loss and large-effective-area optical fibers in the EON.

Description

technical field [0001] The present invention relates to the technical field of optical communication, in particular to an OSNR-aware spectrum allocation method and system under optical channel performance guarantee. Background technique [0002] For optical transmission systems, the low loss and large effective area characteristics of optical fibers can improve performance. But for optical fiber manufacturers, it will be very challenging and expensive to prepare optical fibers with low attenuation coefficient and large effective area. Document N.Guo et al., "Spectrum efficiency and cost evaluation for G.654.Efiber...," in Proc.ACP 2020, paper M4A.274 discloses that in a point-to-point optical transmission system, as the fiber attenuation coefficient decreases small, the spectral efficiency will grow slowly; with the effective area of ​​the fiber from 83μm 2 increased to 130 μm 2 , the spectral efficiency will increase rapidly. [0003] However, in reality, optical fibers...

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is that when overcoming the complete network topology in the prior art, the results obtained by the point-to-point system cannot accurately reflect the benefits of low loss and large effective area optical fiber for optical signal transmission in the network. The technical defect that the traditional OSNR evaluation model is no longer accurate

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