The Research On A New WDM Virtual Synchronized Optical Burst Ring Network

With the increment of traffic requirements and the development of optical transmitting technology, the current optical network is evolving into an all-optical system with optical transmitting and optical switching capabilities, while it was an optical transmitting and electrical switching system. Optical Burst Switching (OBS), regarded as a transitional switching technology, attracts more attention for its burst-based transporting and technological feasibility. At the same time, WDM ring metropolitan networks are usually adopted thanking for mature WDM technology and simple ring topology. Now, a WDM ring metropolitan optical network with OBS technology has become one of the heated studying points.Firstly, a new method of controlling an optical burst ring network is presented here, called Virtual Synchronized-Optical Burst Ring. The presented scheme splits all data channels into small slots and uses an effective resilient off-time control mechanism (ROTC) to keep the offset time large enough between the burst control label (BCL) in the control channel and the data burst slot (DBS) in the data channels; its main advantages are its supporting the space reuse of fiber links, fast and flexible bandwidth accessing, permitting preemptive priority and requiring neither FDLs in each node nor strict clock synchronization through the network. Then, the simulation modules of initialization node, source node, Virtual Synchronized-Optical Burst Add-Drop Multiplexer (VS-OBADM) node and all packet formats presented in this system are described in detail under OPNET Modeler 10.5 software. The aim of constructing these modules is to build a generalized VS-OBR simulation model with flexibility and good expansibility. Finally, the simulation results are analyzed and show the good performances of VS-OBR in maximal throughput, loss probabilities, end to-end delay and so on.