Cryptography – Cryptanalysis
Patent
1992-09-04
1994-05-10
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 49, 380 54, 359118, 359119, 359164, 359173, 359183, 359188, 359195, H04L 900, H04B 1002
Patent
active
053115929
ABSTRACT:
A secure fiber optic communication system capable of tens of gigabits/second data transfer rates that utilizes a pair of single mode fiber optic cables in combination with one or more light sources, phase modulators, detectors and polarization scrambling elements to form a Sagnac interferometer. The phase modulator is driven so that counter propagating light beams in the Sagnac loop experience a different optical path as they pass through the loop. When the two beams are recombined on the central beamsplitter of the Sagnac loop, the two beams interfere with each other and the data impressed as phase modulation on the light beams by the phase modulator is recovered as amplitude modulation on the output detector of the Sagnac interferometer. The system can be configured to operate full duplex on two optical fibers by using light at different wavelengths or time division multiplexing data. The system can also be configured as a multi-node network. Alarms, intrusion control, random pathlength changes and the like can be included to make undetected, unauthorized access to the system even more difficult.
REFERENCES:
patent: 3647275 (1972-03-01), Ward
patent: 4482980 (1984-11-01), Korowitz et al.
patent: 4784453 (1988-11-01), Shaw et al.
Gregory Bernarr E.
McDonnell Douglas Corporation
LandOfFree
Sagnac interferometer based secure communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sagnac interferometer based secure communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sagnac interferometer based secure communication system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2417570