Abstract

As the wavelength resource in mainstream wavelength-division multiple-access (WDMA) systems becomes exhausted, and the bit-rate limitation within a single wavelength bandwidth is reached, alternative approaches to implementing a high-capacity optical fiber network need to be investigated. Coherent optical code-division multiple-access (OCDMA) systems, that can access many users simultaneously and asynchronously (or synchronously) across the single wavelength and same timeslot via spread spectrum techniques, are one alternative. In the longer term, the advantages of OCDMA in tandem with WDMA (OCDMA/WDMA) networks are compelling and worthy of further investigation in the goal of realising an extensive, flexible, high throughput and easily managed optical telecommunication infrastructure. In this paper, coherent OCDMA systems are introduced, and the issues of the system implementation within high-capacity optical fiber networks are discussed. A performance comparison between OCDMA and OTDMA systems is then carried out, both of them using narrow pulse laser sources. An optical fiber network utilizing coherent OCDMA techniques as one layer of a multiplexing hierarchy, in tandem with WDMA, is illustrated and a possible hybrid OCDMA/WDMA network architecture (and its performances and advantages) is described.

[IEEE ]

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J. Lightwave Technol. (8)

K. Nosu, H. Toba, K. Inoue and K. Oda, "100 channel optical FDM technology and its applications to optical FDM channel-based networks", J. Lightwave Technol., vol. 11, pp. 764-776, 1993.

G. J. Foschini and G. Vannucci, "Using spread-spectrum in a high-capacity fiber-optic local network", J. Lightwave Technol., vol. 3, pp. 370-379, Mar. 1988.

P. R. Prucnal, M. Santoro and T. Fan, "Spread spectrum fiber optical local area network using optical processing", J. Lightwave Technol., vol. 4, pp. 307-314, May 1986.

A. R. Chrapllylvy, "Limitations on lightwave communications imposed by optical-fiber nonlinearities", J. Lightwave Technol., vol. 8, pp. 1548-1557, Oct. 1990.

C. A. Brachett, "Foreword is there an emerging consensus on WDM networking?", J. Lightwave Technol., vol. 14, pp. 936-941, June 1996 .

W. Huang, I. Andonovic and M. Tur, "Decision-directed PLL used for coherent optical pulse CDMA systems in the presence of multiuser interference, laser phase noise and shot noise", J. Lightwave Technol., vol. 16, pp. 1786-1794, Oct. 1998.

S. Kawanishi and M. Saruwatari, "Ultra-high-speed PLL-type clock recovery circuit based on all-optical gain modulation in travelling-wave laser diode amplifier", J. Lightwave Technol., vol. 11, pp. 2123-2129, Nov. 1993 .

O. Kamatani and S. Kawanishi, "Ultrahigh-speed clock recovery with phase lock loop based on four-wave mixing in a traveling-wave laser diode amplifier", J. Lightwave Technol., vol. 14, pp. 1757-1767, Aug. 1996 .

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