Secure optical-fiber communication system
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United States of America Patent
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-
Oct 23, 1990
Grant Date -
N/A
app pub date -
May 23, 1989
filing date -
May 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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