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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 18 — Jun. 20, 2009
  • pp: 3515–3520

Eavesdropping in chaotic optical communication using the feedback length of an external-cavity laser as a key

Qingchun Zhao, Yuncai Wang, and Anbang Wang  »View Author Affiliations

Applied Optics, Vol. 48, Issue 18, pp. 3515-3520 (2009)

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An external-cavity laser (ECL) operating in a chaotic state is usually used in a chaotic optical secure communication system and its feedback length (FL) is often regarded as an additional key. Our analyses show that an eavesdropper’s (Eve) laser can synchronize with a transmitter (Alice) without any knowledge of the FL by simply increasing the injection strength. A sequence of a 1   Gbit / s nonreturn-to-zero message encoded by the FL as the key is successfully eavesdropped. The reason for the synchronization deviation between Alice’s and Eve’s lasers is given. Our results indicate that the FL as a key cannot enhance the security of chaotic optical communication using long-ECLs.

© 2009 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(140.1540) Lasers and laser optics : Chaos
(140.5960) Lasers and laser optics : Semiconductor lasers

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 2, 2009
Revised Manuscript: May 7, 2009
Manuscript Accepted: May 29, 2009
Published: June 15, 2009

Qingchun Zhao, Yuncai Wang, and Anbang Wang, "Eavesdropping in chaotic optical communication using the feedback length of an external-cavity laser as a key," Appl. Opt. 48, 3515-3520 (2009)

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