Abstract
We present what we believe to be a novel wavelength-division-multiplexing (WDM)
access switch architecture. The architecture design of the switch is based on an optical
code-division multiple access (OCDMA) with a fast-frequency-hopping (FFH) technique.
Encoding and decoding devices are designed based on the tunable fiber Bragg grating
(FBG). Simulations of the spectral response of these devices are presented, showing the
simultaneous use of the time and frequency domains to achieve OCDMA. Scalability
analysis of the switch fabric based on the analytical performance of the code and
numerical simulations of the optical components used to implement the system is
presented. The multicasting and broadcasting functionality is easily implemented by
including an optical selector and assigning a specific code for multicasting and
broadcasting. This reduces the hardware complexity for these additional network
functions. Analytical performance evaluations and simulations in terms of bit error rate
(BER) are presented. We show that the FFH-OCDMA technique can support a 19 x 19 switch
fabric with BER < 10-11.
© 2004 Optical Society of America
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