Method and apparatus to provide a secure optical communication s

Details Method and apparatus to provide a secure optical communication s Method and apparatus to provide a secure optical communication s

1975-10-31

1980-07-08

Moskowitz, Nelson

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 9630, 455612, G02B 514, H04B 900

Patent

active

042114683

ABSTRACT:
The intelligence on an optical communication system is made secure by launching an intelligence modulated optical beam into the input end of an optical waveguide at a small angle with respect to the axis of the waveguide and launching a masking signal modulated optical beam into the input end of the waveguide at a high angle with respect to the axis of the waveguide. At the output end of the waveguide only the intelligence modulated optical beam is transmitted to an optical detector with the masking signal modulated optical beam being blocked from the detector. This prevents an intruder from separating the intelligence signal from the masking signal when observing the waveguide radially.

REFERENCES:
patent: 2531951 (1950-11-01), Shamos et al.
patent: 3633034 (1972-01-01), Uchida et al.
patent: 3643097 (1972-02-01), Ueki et al.

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