Novel 2-D OCDMA systems using multi-code modulation and optical hard-limiters

A novel 2-D OCDMA system using multi-code modulation (MCM) and optical hard-limiters (OHLs) is proposed in this paper. The proposed system has abilities of simultaneously mitigating dispersion, multiple access interference (MAI), and optical beating interference (OBI). The numerical results show that the proposed system allows for low bit error rate, large number of supportable users, low required power, and high user´s bit rate. For example, the system using 8-MCM can support 38 users at the user´s bit rate 2.5 Gbit/s when the transmitted power per bit is -5 dBm and the transmission length is 20 km.