Hybrid wavelength hopping/time spreading code division multiple access systems

Ljubisa Tancevski; Ivan Andonovic

doi:10.1117/12.201256

17 February 1995 Hybrid wavelength hopping/time spreading code division multiple access systems

Ljubisa Tancevski, Ivan Andonovic

Proceedings Volume 2450, Broadband Networks: Strategies and Technologies; (1995) https://doi.org/10.1117/12.201256
Event: Advanced Networks and Services, 1995, Amsterdam, Netherlands

Abstract

The capacity of local area networks (LAN) can be substantially increased by amalgamating different access techniques. Wavelength Division Multiplexing (WDM) and Code Division Multiple Access (CDMA) both offer and asynchronous mode of communications. Integration of WDM and CDMA could offer increases in the network capacity whilst still attaining asynchronous operation. Here, a different kind of integration is proposed, similar to the hybrid system used in electrical CDMA. A novel optical CDMA concept using wavelength hopping and time spreading is described employing prime sequences for both hopping and spreading and proof is given that the autocorrelation function has zero side-lobes and that the crosscorrelation function is at most 1. Code generation and correlation is achieved efficiently, the number of possible stations is greatly increased as is the number of simultaneous users. It is shown that the system offers unprecedented security leading to a very secure communications. The system is suitable for truly asynchronous highly secure LAN applications.

Citation Download Citation

Ljubisa Tancevski and Ivan Andonovic "Hybrid wavelength hopping/time spreading code division multiple access systems", Proc. SPIE 2450, Broadband Networks: Strategies and Technologies, (17 February 1995); https://doi.org/10.1117/12.201256

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