Abstract

We propose a “synchronous” wavelength-time optical code-division multiple access (CDMA) scheme using 2-D Walsh-based bipolar–bipolar code, in which Walsh code sequences are used for time spreading, in place of Barker sequences used in our previously proposed “asynchronous” bipolar–bipolar code. The new synchronous coding scheme supports larger cardinality and better performance than the asynchronous scheme because Walsh code has a larger cardinality than Barker sequences and has a zero cross-correlational property at the expense of system synchronization. One potential application is future CDMA-based passive optical networks, in which synchronous downstream traffic uses the Walsh-based bipolar–bipolar code and asynchronous upstream traffic uses the Barker-based counterpart. Since the new code is modified from the original code, the same hardware can be used for both directions of traffic.

© 2007 IEEE

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