29-05-2010, 12:13 AM
In optical networks three multiple access tech. are used WDMA, TDMA, CDMA. In CDMA we need more and more orthogonal codes. It is different from normal orthogonal codes as that are bypolar where as in optical domin thing are unipolar. So this needs one new codes which have less weight. For this thing few techniques are available and we have to develop new one