CPC H04Q 11/0062 (2013.01) [H04B 10/07953 (2013.01); H04Q 2011/0073 (2013.01); H04Q 2011/0084 (2013.01); H04Q 2011/0086 (2013.01)] | 10 Claims |
1. A method of OSNR-sensing spectrum allocation with optical channel performance guarantee, comprising the steps of:
S1: constructing an OSNR evaluation model to evaluate signal transmission quality of a lightpath, the OSNR evaluation model including amplified spontaneous emission noise, nonlinear interference and filter narrowing effect due to ROADM cascading;
S2: sending a lightpath service request and acquiring the shortest path between a source node and a destination node;
S3: acquiring a plurality of modulation formats and corresponding thresholds, sorting the plurality of modulation formats according to their spectrum efficiencies in descending order, and obtaining a list of the sorted modulation formats;
S4: calculating the bandwidth required by the lightpath service based on the bandwidth demand and FEC overhead by using the modulation format with the highest spectrum efficiency;
S5: substituting the bandwidth required by the lightpath service into the OSNR evaluation model and obtaining the number of FS actually required by the service; and
S6: allocating the spectrum resource required by the current service to the shortest path by using a first-fit algorithm, and obtaining the center frequency of the current service on the lightpath.
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