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Asia Communications and Photonics Conference

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 1, 2010• 0 citations
Publisher

Abstract

We experimentally 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 investigate the influence of input pulse and the experimental measurement matches the calculated result very well.

DOI
10.1109/acp.2010.5682595

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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.
Spectral phase coding by using 0/π-phase-shift and ±π/2-phase-shift are thoroughly studied. The security vulnerability and improvement are analysed by evaluating the encoded signal. ίπ/2-phase-shift spectral phase coding can guarantee the security by hiding the optical code in the encoded signal. In addition, coding performance of both spectral phase coding techniques is investigated by measuring auto-correlation and cross-correlation properties when using a set of 7-chip and 31-chip optical codes. ±π/2-phase-shift spectral phase coding presents better coding performance. It is for the first time revealed that the coding performance of spectral phase coding is irrelevant to the properties of the optical codes.