OSNR Based Service Routing Optimization Algorithm In Power Optical Transmission Network

With the increasing number of services in optical transmission network(OTN)and the planning of services' routes seldom consider about the factor of load balancing.It makes the Load-Balance of the network become more and more uneven.Some cables carry a lot of services but some carry just few of services.So we need to optimize the services' routes to make the network load-balance and reduce the risk of the network.However,the existed optimal route algorithm seldom consider the optical transmission constraints which is particular in the optical transmission network like optical signal noise ratio(OSNR)and optical power.They just consider about hop,distance and so on.But in power OTN,the most important parameter in the physical layer is OSNR.If OSNR is too low may make transmission error,bad QoS,increasing in transmission consumption and so on.To make up for existed optimal route algorithm,our paper's algorithm is based on them and add the factor of optical transmission constraints which is particular in the optical transmission network.It consider not only time delay and load-balancing,but also OSNR and optical power.Because services' routes optimization is complex and may have many targets,we will use improved ant colony algorithm to design our OSNR based service routing optimization algorithm.The simulation results show that our optimal route algorithm can balance the load of network,and increase OSNR and reduce the number of hops of the routes meanwhile.To validate our algorithm,we based on our algorithm and design services' routes optimization module in OTN simulation and optimal platform.The whole module consists of three parts which are services'routes view,services' routes optimization and new services' routes planning.The module can not only find the deficiency of existed services'routes,but also provide plans for the true service routing.Finally through actual operation,it validate the functions of our module can run correctly.And it also validate the practicability of our algorithm.In a word,our paper design a algorithm which consider both OSNR and load balancing.The simulation shows that our optimal route algorithm can improve OSNR and load balancing.Then we make a module based on our algorithm.Through actual operation,it validate the practicability and validity of our algorithm.