Secure optical-fiber communication system

Details Secure optical-fiber communication system Secure optical-fiber communication system

1989-05-23

1990-10-23

Goldstein, Herbert

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

370 3, 340555, 379 35, H04B 1000

Patent

active

049658565

ABSTRACT:
A data signal and a reference signal are multiplexed into a fiber optic communications link for transmission from a first secure location to a seond location. A replica of the reference signal is transmitted from the first location to the second location over a separate communication channel. At the second location, the angular phase difference between the reference signal and the replica thereof is continuously monitored. If the angular phase difference departs significantly from a specified value, an alarm is set as a warning that the fiber optic communications link has been compromised.

REFERENCES:
patent: 4207561 (1980-06-01), Steensma
patent: 4435850 (1984-03-01), Bowen et al.
patent: 4591709 (1986-05-01), Koechner et al.
patent: 4628501 (1986-12-01), Loscoe
patent: 4632515 (1986-12-01), Stowe et al.
patent: 4636029 (1987-01-01), Johansson et al.
patent: 4887313 (1989-12-01), Luke et al.

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