Hybrid time-spreading/wavelength-hopping optical CDMA network with merged M-sequence coding transmission

A new hybrid time-spreading and wavelength-hopping optical CDMA system with merged M-sequence codes (merged M-hop sequences) is proposed. The M-hop coded configuration for optical encoder/decoder with multiple fiber-gratings and delay-lines is constructed. System performance is compared with the well-known prime-hop sequences. It is found that merged M-bop sequences not only possess higher capacity but also simpler configuration; it also cost less under the same BER conditions. In the proposed hybrid system, it has the advantages of good correlation properties for asynchronous I synchronous optical CDMA systems and more simultaneous users with simpler and lower cost configuration.