Project-oriented Wdm Optical Network Planning And Optimization System Rwa And Srlg Study

As society and economic development, network technology is changing fast, there is an explosive growth trend in internet business in the world, meanwhile, the demand of communicate traffic is more high-level and diversity. Although this is a huge challenge for the capacity of communication network, the emergence of fiber communication technology brings vibrant opportunities. As fast optical network technology development, optical fiber communication gradually evolves into an important networking means from the simple transmission technology. Optical transmission network with huge capacity and good flexibility, based on wavelength division multiplexing (WDM), becomes the focus in current optical communication field.By utilizing equipments like Optical Cross Connect (OXC), WDM network could provide end-to-end light-paths to source-destination node pairs and re-use wavelength resources. On the other hand, a single node or link failure will cause severe service disruption in such network, since large amount of traffic is aggregated to less equipment owing to the use of WDM technology. Hence, network survivability has becoming a critical problem in network design. Meanwhile, dynamic characteristics of network traffic shows increasingly, it demands WDM should have the ablity of responding dynamic traffic quickly. In the dynamic environment, in order to enhance network resource utilization and reduce network congestion rate, it's very important to design a good tactic about routing and bandwidth assignment in path protection.With optical network programme and optimization software"Unitrans ZXTOP 500"which the author participated in, the article studys dynamic routing and wavelength assignment algorithm based on WDM optical network survivability, and put forward a new algorithm based on part of wavelength conversion. First of all, the algorithm confirms several alternate routings according to requirement and sorts them with the sequence; then, it acquires the collection of all available wavelengths according to the wavelength assignment scheme in the algorithm, and gets the assignment result by selecting the collection of the least wavelength conversion times. At last, the simulation tests verified the performance of the algorithm.Furthermore, because of fast recovery and easy operation, protect mechanism based on SRLG restriction has become the effective mechanism to solve network survivability, and the article also mentions a new algorithm based on dynamic mixed shared paths in SRLG restriction in network survivability (DMSP). This algorithm is a new dynamic traffic assignment algorithm based on SRLG; it avoids traps in SRLG effectively by using many protect paths and enhance resource utilization by sharing all resources. Even though traps emerge, it's able to restore effectively. At last, the simulation data analysis proved this algorithm is superior to others in resource utilization and traffic congestion.