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Compensating fiber gratings for source flatness to reduce multiple-access interferences in optical CDMA network coder/decoders

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3 Author(s)
Jen-Fa Huang ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Taiwan ; Chen-Mu Tsai ; Yu-Lung Lo

A fiber-Bragg-grating (FBG)-based optical code-division multiple-access (OCDMA) network coder/decoder (codec) is investigated for its interference suppression induced by nonflattened broad-band lightwave sources. Since each network user with different signature address code has different spectral distribution, the nonflattened light sources will cause multiple-access interference (MAI). Flatness compensation schemes are proposed to solve the MAI effects induced by nonflattened broad-band light sources. By arranging the same coding scheme but in different spectral coding band, spectral chips from FBG coder/compensator will incoherently power summed in the photodetectors to approach a more flattened power level. Signal-to-interference ratio (SIR) performances are evaluated with such compensation method for the discussed OCDMA network.

Published in:

Lightwave Technology, Journal of  (Volume:22 ,  Issue: 3 )

Date of Publication:

March 2004

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