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An optical CDMA system based on spectral encoding of LED

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2 Author(s)
Zaccarin, D. ; Dept. of Electr. Eng., Ottawa Univ., Ont., Canada ; Kavehrad, M.

A optical code-division multiple access (CDMA) system based on amplitude spectral encoding of low-cost broadband sources such as light-emitting diodes is presented. The proposed system uses a standard nondispersive lens-grating apparatus and simple direct-detection receivers. It is shown that by assigning to N subscribers the N cycles shifts of a single unipolar m-sequence of period N, complete orthogonality between the users can be achieved, provided that the spectrum is properly equalized. It is also shown that without any equalization, and for N=511, up to 200 users can transmit asynchronously with an average error probability equal to 10/sup -9/, depending on the received power level. An aggregate network throughput of 100 Gb/s can therefore be obtained.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 4 )

Date of Publication:

April 1993

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