In this paper, a new architecture of the networks based on the proposed optical CDMA based on PON (OCDMA-PON) is presented, the design of the Optical Line Terminator (OLT) and the Optical Network Unit (ONU) for the OCDMA-PON are studied. The performance of networks based on the OCDMA-PON is analyzed in detail. Its bit error rate (BER) performance, networks scalability and transmission performance of such a system are studied under consideration of the multiple user interference (MUI) and the difference noise contributions. As shown in the study, the number of ONU/ONT, the channel link length, the number of available codes and the optical component characteristics deeply impact both the scalability and the transmission performance of such a system. Simulation results indicate that the proposed scheme is feasible and that the novel design can improve the scalability and transmission performance of the optical access networks.
This paper presents a low-complexity parallel Reed-Solomon (RS) (255,239) decoder architecture using a novel
pipelined variable stages recursive Modified Euclidean (ME) algorithm for optical communication. The pipelined four-parallel
syndrome generator is proposed. The time multiplexing and resource sharing schemes are used in the novel
recursive ME algorithm to reduce the logic gate count. The new key equation solver can be shared by two decoder macro.
A new Chien search cell which doesn't need initialization is proposed in the paper. The proposed decoder can be used
for 2.5Gb/s data rates device. The decoder is implemented in Altera' Stratixll device. The resource utilization is reduced
about 40% comparing to the conventional method.