Packet throughput performance of multiservice, multirate OCDMA in elastic networks

In this paper, the packet throughput performance of multiservice, multirate optical code-division multiple-access (OCDMA) networks is addressed based on two distinct multirate techniques, namely multilength code and multicode. A new analytical formalism to evaluate the packet throughput performance of both multirate techniques is proposed. The proposed formalism can be successfully applied for performance evaluation of any arbitrary number of user classes in the system as well as for both 1-D and 2-D codes. The bit error rate (BER) and packet correct probability expressions are derived considering the multiple-access interference (MAI) as binomially distributed. The packet throughput expression, by its turn, is derived considering a Poisson distribution for the composite packet arrivals. Numerical results show that the multicode technique is a good candidate for future multiservice, multirate OCDMA implementations, where higher rates and diversified patterns of data traffic will be major network requirements.