Calculation and optimization of OSNR based on long-distance OTN network

With the rapid development of national power grid, large-scale electric power communication network is evolving into OTN network in order to back up the power grid management, operation and maintenance of a large number of data communication. Long-distance optical communication is the characteristic of large-scale OTN network, as a result, the calculation of OSNR plays a critical role in research and application to the network. This paper will focus on the analysis of the topology characteristics of long-distance OTN power communication network. The OSNR calculation method based on the topology structure will be proposed, and the features, significance and popularization value of this method will be analyzed.