Optimization of FDL buffers and cost function for contention resolution in OCDM/WDM

The key issue of network performance in photonic packet switches is a Packet contention. A proper contention scheme must be used to avoid early packet switching congested. In the Optical Packet Switching Architecture using Fiber Delay Line (FDL) has been used with Optical Code Division Multiplexing and Wavelength Division Multiplexing (OCDM/WDM) techniques to solve the contention resolution, the packet delay becomes an important issue that needs to be reduced, as well as node cost. In this paper, we optimized the number of FDLs needed to be used in switching node where the total cost associated to the employment of FDLs is minimized subject to performance requirements. The optimal number of buffers is determined by simulation experiments. The result shows that 64 shared Feed-Back buffers and 64 shared Feed-Forward buffers are the optimum buffers for the hybrid OCDM/WDM technique.