Cryptography – By modifying optical image
Patent
1985-05-02
1992-08-18
Cangialosi, Salvatore
Cryptography
By modifying optical image
380 59, H04B 900
Patent
active
051406365
ABSTRACT:
An apparatus for a method for assuring the secure transmission of information between a transmitter and a receiver is fabricated along the lines of a Mach-Zehnder interferometer. Two, identical length single-mode fibers extend between the transmitter and receiver to act as transmission paths. Within the transmitter a coiled length of like single-mode fiber integrally extends from one of the fibers reaching from the transmitter to the receiver. Within the receiver a like length of like single-mode fiber integrally extends from the other end of the other fiber reaching from the transmitter to the receiver. A superradiant diode in the transmitter emits pulses of coherent wavetrains that are split and sent through the two lengths of fibers and their associated integrally connected coils. A detector in the receiver senses variations in the interference fringes when a modulator in the transmitter shifts in path length the coherent wavetrains in one of the fibers in accordance with the information desired to be transmitted. Because of the integrally extending coils in the transmitter and the receiver, an intruder to the system would be unable to find where the transmission paths are identical and hence would be unable to monitor the modulated interference fringe patterns.
REFERENCES:
patent: 4000416 (1976-12-01), Goell
patent: 4174149 (1979-11-01), Rupp
patent: 4207561 (1980-06-01), Steensma
patent: 4211468 (1980-07-01), Steensma
patent: 4217488 (1980-08-01), Hubbard
patent: 4376248 (1983-03-01), Giallorenzi et al.
patent: 4378497 (1983-03-01), Giallorenzi et al.
patent: 4399565 (1983-08-01), Jarret et al.
patent: 4435850 (1984-03-01), Bowen et al.
patent: 4493114 (1985-01-01), Czeller et al.
patent: 4561119 (1985-12-01), Epworth
Electro-Optics/Laser International '76 UK-"An Optical Fibre Data Collection ighway"-D. E. N. Davies and S. A. Kingsley (copy attached hereto).
Cangialosi Salvatore
Fendelman Harvey
Keough Thomas Glenn
The United States of America as represented by the Secretary of
LandOfFree
Interferometric optical fiber data link does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Interferometric optical fiber data link, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interferometric optical fiber data link will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1254885