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IEEE Photonics Technology Letters

Security Improvement Using $\pm\pi/2$-Phase-Shifted SSFBG En/Decoder in Time-Spreading OCDMA

Bo Dai, Xu Wang

Published Apr 8, 2010• 14 citations
Publisher

Abstract

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.

DOI
10.1109/lpt.2010.2046632

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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.
A semi-physical simulation was proposed on stealth transmission of 10Gbps 127-chip superstructure fiber Bragg grating (SSFBG) based equivalent phase shift (EPS) temporal phase encoded/decoded (TPE/D) on-off keyed (OOK) optical-code-division multiplexing (OCDM) secure signal over a 2-wavelength 10Gbps wavelength division multiplexing (WDM) public network. Secure signal can be error-free transmitted beneath the noise floor of 2-wavelength public WDM network both in temporal and frequency domain. The decoding performance of secure signal was highly affected by wavelength space between public and stealth channel. The power penalty of each WDM channel was less than 0.1dB due to existence of secure signal.