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Optics Letters

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  • Vol. 36, Iss. 9 — May. 1, 2011
  • pp: 1623–1625

Rapid programmable/code-length-variable, time-domain bit-by-bit code shifting for high-speed secure optical communication

Zhensen Gao, Bo Dai, Xu Wang, Nobuyuki Kataoka, and Naoya Wada  »View Author Affiliations


Optics Letters, Vol. 36, Issue 9, pp. 1623-1625 (2011)
http://dx.doi.org/10.1364/OL.36.001623


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Abstract

We propose and experimentally demonstrate a time-domain bit-by-bit code-shifting scheme that can rapidly program ultralong, code-length variable optical code by using only a dispersive element and a high-speed phase modulator for improving information security. The proposed scheme operates in the bit overlap regime and could eliminate the vulnerability of extracting the code by analyzing the fine structure of the time-domain spectral phase encoded signal. It is also intrinsically immune to eavesdropping via conventional power detection and differential-phase-shift-keying (DPSK) demodulation attacks. With this scheme, 10 G bits / s of return-to-zero-DPSK data secured by bit-by-bit code shifting using up to 1024 chip optical code patterns have been transmitted over 49 km error free. The proposed scheme exhibits the potential for high-data-rate secure optical communication and to realize even one time pad.

© 2011 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4510) Fiber optics and optical communications : Optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(060.4785) Fiber optics and optical communications : Optical security and encryption

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: February 16, 2011
Revised Manuscript: March 8, 2011
Manuscript Accepted: March 26, 2011
Published: April 27, 2011

Citation
Zhensen Gao, Bo Dai, Xu Wang, Nobuyuki Kataoka, and Naoya Wada, "Rapid programmable/code-length-variable, time-domain bit-by-bit code shifting for high-speed secure optical communication," Opt. Lett. 36, 1623-1625 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-9-1623


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