Optical Code Division Multiplex Switching Network Load Balancing Algorithm

Due to the capability of all-optical signal processing, optical code division multiplexing (OCDM) is regarded as one of the most promising technologies to relize all-optical network. Optical packet switched network adopting the OCDM technology has many advantages such as all-optical label recognition, multicasting and self-routing. This dissertation makes deep investigations into the problem of load balancing in the network of optical packet switching (OPS). The BER values of the nodes and the bandwidth of the links are chosen to be the two basic indexes of the algorithms.The details of the research resluts are listed as follow:(1) The end-to-end BER in OCDM all-optical packet switched networks is analyzed. Based on the calculation results of BER, the algorithms of establishing the label link and distributing the encoder/decoder resources are studied. Two algorithms are proposed by setting the weithts of the nodes. The comparision between the proposed algorithms and the min-hop algorithm (MHA) is performance. The results show that the performed of the proposed algorithms are better than that of the MHA. The resource distribution method, which focuses on how to distribute the number of the encoders and decoders in the nodes, is investigated in the dissertation. A novel algorithm of the resource distribution is proposed and the corresponding simulation is performaned. The simulation results show the number of successfully established label path is improved after the optimum distribution and the end-to-end average BER and the average hopping number of the label paths are not influenced.(2) The load-balancing algorithm is investigated by considering the link bandwidth. The two novel load-banlancing dynamic routing algorithms are proposed after analyzing the current algorithms: minimum hop algorithm (MHA), widest-shortest path (WSP) and minimum inerference routing (MIRA). The two algorithms take the link importance value into account. The basic stardand of setting the link weights is that the link with higher bandwidth utilization is given a bigger weight and that with lower bandwidth utilization is set a smaller weight. The simulation results show that the propose algorithms has the excellent load-balancing performance and the network utilization is improved obviously comparing the three existing algorithms.