Blocking Performance of Multi-rate OCDMA PONs with QoS Guarantee

In this paper, we propose a new teletraffic model for the calculation of blocking probabilities in an Optical Code Division Multiple Access (OCDMA) Passive Optical Network (PON) supporting multiple service-classes of Poisson traffic. OCDMA is a promising candidate of PON configuration for the provision of moderate security communications with large dedicated bandwidth to each end user. The PON accommodates multiple service-classes that are differentiated by either different data-rates or different Quality of Service levels. Parameters related to the additive noise, multiple access interference and user activity are incorporated into our analysis. Based on a twodimensional Markov chain, we propose a recursive formula for the calculation of the number of in-service codewords, when the OCDMA PON guarantees Quality of Service (QoS), or not. To evaluate the proposed model, the analytical results are compared with simulation results to reveal that the model’s accuracy is quite satisfactory. Keywords-Passive Optical Network; Optical Code Division Multiple Access; Multiple Access Interference; Blocking Probability; Quality of Service; Parallel Mapping.