Optical Burst Switching (obs) Performance

Aiming to reduce system loss probability and to increase the switch efficiency ofcore node, this research probes into different switch efficiency of the OBS core nodeachieved by FDL and TWC respectively. Simulations are conducted to evaluate theperformance of different allocations in constructing the core node model. Thesimulation software is OPNET 8.0 version. The study shows that the shared-FDLand the no-shared-FDL are both effective in reducing loss probability and thatthe-no-share-FDL has higher switch efficiency than the-share-FDL. However, thefunction of FDL is not infinite. When the space of FDL reaches a limit, the systemloss probability will not keep decreasing as FDL increases. In the case of TWC, thestudy shows that TWC can improve the system switch efficiency when the networktraffic load is low. Nevertheless, as the network traffic load increases, the function ofTWC in reducing loss probability becomes limited. To further improve the systemswitch efficiency, the model of increasing the number of wavelength in out fiber isapplied, which is found to be capable of reducing the loss probability. In the meantime,loss probability will not decrease in proportion to the increase of wavelength, whichcan come into play only with the simultaneous increase of TWC. Therefore, theno-shared variable-delay FDL plus TWC model is applied in core node to betterimprove the switch efficiency. The simulation result shows that this model caneffectively improve the switch efficiency. When the 4×8 core node is under 0.9 load,the loss probability is 0.000008. and when the load is under 0.6, the loss probability isunder 10-6 . Lastly, the impact of self-similarity on the switch function of OBS hasbeen studied. The research shows that under the impact of self-similarity, the switchfunction is reduced and that self-similarity has negative impact on the OBS.