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Proceedings Paper

Hybrid wavelength hopping/time spreading code division multiple access systems
Author(s): Ljubisa Tancevski; Ivan Andonovic
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Paper 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.

Paper Details

Date Published: 17 February 1995
PDF: 8 pages
Proc. SPIE 2450, Broadband Networks: Strategies and Technologies, (17 February 1995); doi: 10.1117/12.201256
Show Author Affiliations
Ljubisa Tancevski, Univ. of Ljubljana (Slovenia)
Ivan Andonovic, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 2450:
Broadband Networks: Strategies and Technologies
Robert A. Cryan; P. Nalinaj Fernando; Pierpaolo Ghiggino; John M. Senior, Editor(s)

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