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IEEE/CIC International Conference on Communications in China (ICCC)

±π/2-Phase-shift spectral phase encoding for security improvement in the optical code based system

Ali Zahid, Bo Dai, Yao Chen, Dong Wang, Chun-xian Tao, Dawei Zhang, Xu Wang

Published Oct 1, 2014• 1 citation
Publisher

Abstract

A novel spectral phase encoding scheme by using ±π/2 phase shift in the en/decoding is proposed. The scheme can submerge the code information in the encoded signals well, improving the security against code extraction from the encoded signals. Furthermore, based on the theoretical analysis, the coding performance of the proposed scheme is guaranteed.

DOI
10.1109/iccchina.2014.7008258

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A novel spectral phase encoding scheme by using ±π/2 phase shift in the en/decoding is proposed. The scheme can submerge the code information in the encoded signals well, improving the security against code extraction from the encoded signals. Furthermore, based on the theoretical analysis, the coding performance of the proposed scheme is guaranteed.
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Security Improvement Using ±π/2\pm\pi/2±π/2-Phase-Shifted SSFBG En/Decoder in Time-Spreading OCDMA
The existence of dips in the waveform encoded by 0/π-phase-shifted superstructured fiber Bragg grating (0/π -SSFBG) allows eavesdroppers to extract code sequence straightforwardly. In this letter, the code extraction technique for 0/π-SSFBG is summarized and demonstrated. To address this security issue, we propose using ±π/2-phase-shifted ±π/2-SSFBG as encoder/decoder to improve security in time-spreading optical code-division multiple-access. The security and coding performances for both ±π/2-SSFBG and 0/π-SSFBG are compared; ±π/2-SSFBG exhibits improved security and better coding performance. The influence of input pulse over the security performance for ±π/2 -SSFBG is discussed. Short input pulse can improve the security of the encoded signal.
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.