Optical privacy communication system in two-way optical transmission system
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United States of America Patent
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Jun 12, 1990
Grant Date -
N/A
app pub date -
Jul 21, 1988
filing date -
Jul 23, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical privacy communication system in optical fiber communications between many points is disclosed in which, each station is provided with a privacy circuit. Each privacy circuit comprises a first optical branch for connecting the station to first and second optical branches, a second optical branch for connecting the first and second optical branches to the optical fiber transmission line, an optical isolator inserted in the first optical branch, for passing only a signal of a direction from the first optical branch to the second optical branch, and an optical filter inserted in the second optical branch, for passing only an optical signal of a frequency assigned to the station, so that an optical privacy communication is carried out between the stations.
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