A hybrid mo-demodulation approach, fully insensitive to the phase nois
e induced by the sources, is described for CDMA applications at optica
l frequencies. It is analytically demonstrated that, using bipolar cod
es in conjunction with polarisation modulation, the considered system
can improve the performance of coherent schemes with not negligible la
ser linewidths, as well as the performance of more conventional non-co
herent schemes based on intensity modulation and unipolar codes.