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

Bo Dai; Xu Wang

doi:10.1109/LPT.2010.2046632

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

Bo Dai, Xu Wang

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The existence of dips in the waveform encoded by 0/pi-phase-shifted superstructured fiber Bragg grating (0/pi-SSFBG) allows eavesdroppers to extract code sequence straightforwardly. In this letter, the code extraction technique for 0/pi-SSFBG is summarized and demonstrated. To address this security issue, we propose using +/-pi/2-phase-shifted +/-pi/2-SSFBG as encoder/decoder to improve security in time-spreading optical code-division multiple-access. The security and coding performances for both +/-pi/2-SSFBG and 0 pi/2-SSFBG are compared; +/-pi/2-SFBG exhibits improved security and better coding performance. The influence of input pulse over the security performance for +/-pi/2-SSFBG is discussed. Short input pulse can improve the security of the encoded signal.

Original language	English
Article number	5443574
Pages (from-to)	881-883
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	22
Issue number	12
DOIs	https://doi.org/10.1109/LPT.2010.2046632
Publication status	Published - 15 Jun 2010

Keywords

Fiber Bragg grating (FBG)
Optical code-division multiple-access (OCDMA)
Phase coding
Security

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10.1109/LPT.2010.2046632

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abstract = "The existence of dips in the waveform encoded by 0/pi-phase-shifted superstructured fiber Bragg grating (0/pi-SSFBG) allows eavesdroppers to extract code sequence straightforwardly. In this letter, the code extraction technique for 0/pi-SSFBG is summarized and demonstrated. To address this security issue, we propose using +/-pi/2-phase-shifted +/-pi/2-SSFBG as encoder/decoder to improve security in time-spreading optical code-division multiple-access. The security and coding performances for both +/-pi/2-SSFBG and 0 pi/2-SSFBG are compared; +/-pi/2-SFBG exhibits improved security and better coding performance. The influence of input pulse over the security performance for +/-pi/2-SSFBG is discussed. Short input pulse can improve the security of the encoded signal.",

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

Abstract

Keywords

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