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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Experimental demonstration of ±π/2-phase-shifted SSFBG encoder for security improvement in time-spreading OCDMA

Bo Dai, Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya Wada

Published Dec 26, 2010• 0 citations
Publisher

Abstract

We demonstrate the security improvement using ±π/2-phase-shifted SSFBG encoder in time-spreading OCDMA. Compared with conventional 0/π-phase-shifted SSFBG encoder, ±π/2-phase-shifted SSFBG encoder conceals code pattern well in the encoded waveform. We also theoretically analyze and experimentally investigate the influence of input pulse and the experimental measurement matches the calculated result very well.

DOI
10.1117/12.887741

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We demonstrate the security improvement using ±π/2-phase-shifted SSFBG encoder in time-spreading OCDMA. Compared with conventional 0/π-phase-shifted SSFBG encoder, ±π/2-phase-shifted SSFBG encoder conceals code pattern well in the encoded waveform. We also theoretically analyze and experimentally investigate the influence of input pulse and the experimental measurement matches the calculated result very well.
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In this paper,0 / π-phase-shifted SSFBG( 0 / π-SSFBG) and the ± π /2-phase-shifter SSFBG( ± π/2-SSFBG) are used to encode the optical pulse signal. A comparison is made of the security performance of the 0 / π-SSFBG and the ± π /2-SSFBG. We evaluate the security performance by the investigation of the encoded waveforms of both encoders. The existence of dips in the waveform encoded by 0 / π-SSFBG allows eavesdroppers to extract code sequence straightforwardly. Nevertheless,the ± π /2 SSFBG based encoder improves the security by concealing the code information in the encoded waveform.