Method and system for encryption of optical signals

Details Method and system for encryption of optical signals Method and system for encryption of optical signals

2007-02-27

2007-02-27

Smithers, Matthew (Department: 2137)

Cryptography

Communication system using cryptography

Fiber optic network

C380S255000, C380S257000, C380S277000, C380S278000, C380S280000, C380S285000

Reexamination Certificate

active

10067390

ABSTRACT:
A method, a system and a device for encrypting an optical signal to be transmitted via an optical fiber communication link by causing controlled chromatic dispersion of said signal. The controllable decryption device, as well as the controllable decryption device, can be implemented in the form of a variable dispersion compensation module controlled by a decryption key. In the system, the encryption device and the decryption device are controlled in synchronism by an encryption key and a decryption key respectively, the keys preferably being functions of time symmetric with respect to the time axis.

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Patent Abstracts of Japan: JP 2000 235170 published Aug. 29, 2000, in the name of NEC Corp, entitled “Variable Dispersion Compensator”.
Torres, et al, “Optical Encryption for High-Bit Rate Systems Using Fiber Bragg Gratings”, SBMO/IFEE MTT-SIMOC '99 Proceedings, (Aug. 9, 1999) vol. 1, 83-85.
Torres, et al, “Security System for Optical Communication Signals with Fiber Bragg Gratings”, IEEE Transactions on Microwave Theory and Techniques (Jan. 2002) vol. 50, No. 1, 13-16.
Annie Lindstrom, “Defeating Dispersion, Part II: To Reach 40 Gb/s, Carriers and Vendors Need to Get a Very Tight Grip on Chromatic Dispersion”,Telephony, Dec. 4, 2000, www.internettelephony.com.
Abstract for JP 2000235170A2, Applicant: NEC CORP, Title: “Variable Dispersion Compensator”, Issued Aug. 29, 2000 [online][retrieved on Oct. 2, 2002 fromThe Delphion Integrated View, http://www.delphion.com/details?pn+JP20235170A2].

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