Suppression of WDM interference for error-free detection of ultrashort-pulse CDMA signals in spectrally overlaid hybrid WDM-CDMA operation

We demonstrated the complete suppression of wavelength division multiplexing (WDM) interference for the error-free detection of ultrashort-pulse code division multiple access (CDMA) signals in spectrally overlaid optical WDM-CDMA hybrid operation by the use of narrowband spectral notch filters in the CDMA decoder and a fiber nonlinear thresholder. Our experimental results show the feasibility of CDMA detection in a scheme where WDM channels are overlaid on CDMA channels in the same spectral region.