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Proceedings Paper

A secure optical communication system based on bent sequence
Author(s): Hailei Xu; Jinfang Zhou; Menghu Cao; Kangsheng Chen
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Paper Abstract

Secure optical communication systems based on general bent sequences have been described which encode/decode information with arrays of fiber Bragg gratings (FBG). A broadband pulse coming from an optical source will be split into a series of separated pulses when it reaches the encoding FBG array. These pulses have different spectrums and different time delays. Because it is difficult for an attacker to recover the original pulse if he doesn't know the exact structure of the encoding FBG array, one can say that the information from the optical source has been encrypted. The coded signal will be recovered by the decoding FBG array having the inverse structure of the encoding FBG array. Because various structures of encoding FBG arrays could generate different reflected pulses to ensure the security of communication in the unsafe channels, grating tuning techniques are used broadly to increase the modes of the systems. Some models of the systems will be introduced and their security will be discussed. Bent sequence is generated by a general class of bent functions to charge the modes of FBG arrays in order to increase the security of our systems because of its excellent characteristics in cryptology. That makes the optical communication system safe against the interception. Simulation and discussion will be included and the applicability of the system in the future has been prospected.

Paper Details

Date Published: 9 December 2005
PDF: 8 pages
Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 60213N (9 December 2005); doi: 10.1117/12.636456
Show Author Affiliations
Hailei Xu, Zhejiang Univ. (China)
Jinfang Zhou, Zhejiang Univ. (China)
Menghu Cao, Zhejiang Univ. (China)
Kangsheng Chen, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 6021:
Optical Transmission, Switching, and Subsystems III
Rodney S. Tucker; Dominique Chiaroni; Wanyi Gu; Ken-ichi Kitayama, Editor(s)

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