Comparative study of 2D-OCDMA-WDM system performance in 40-Gb/s PON context

In this study, a optical passive networks system-based 2D-optical code division multiple access (OCDMA) wavelength division multiplexing (WDM) is proposed. For the uplink, 2D-prime hop system (PHS) codes and 2D-HC are employed. Nonetheless, a WDM scheme is used for the downlink. The system is firstly analysed and the performances are then provided in terms of signal-to-noise ratio (SNR) bit error rate (BER), Q-factor and optical power budget as function of optical received power. The authors show that the proposed system can reach 40 Gb/s with a good BER value <10 − 10 when a vertical-cavity surface-emitting laser and an APD receiver are deployed in the optical network unit and optical line terminal, respectively. Moreover, it is shown that bit rate can be increased up to 150 Gb/s using 2D-HC codes for the uplink. Finally, power budget for 524 network subscribers is achieved showing a long PON distance up to 41 Km with a maximum throughput equal to 285.1 Gb/s/Km using an emitted average power equal to 15 dBm.