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

Bo Dai, Xu Wang

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


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 languageEnglish
Article number5443574
Pages (from-to)881-883
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number12
Publication statusPublished - 15 Jun 2010


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


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