Performance Evaluation of a Packet Switched Multi-wavelength Optical CDMA Network

摘要

In this paper an analytical model has been developed for a packet switched multi-wavelength optical CDMA network to study its system performance, while employing various two-dimensional optical codes. The model adopts Poisson distributed traffic implying infinite population assumption to reduce the computational complexity. It takes into account the packet errors due to chip interference between the code words. Further, guard time between chip pulses is introduced in order to relax the tiuiability requirements of the lasers in the wavelength hopped 2-D OCDMA scheme. Guard time reduces network speed and lowers the effective data transport. However the probability of receiving correct data packets is improved due to reduced chip interference. The combined impact of both on system behavior (throughput and delay) for different multi-wavelength codes is investigated.