Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-07-30
1989-11-21
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
250239, 2504911, 357 81, 455609, H04B 900
Patent
active
048827720
ABSTRACT:
An electro-optical coherent light beam signal transmission system capable of transmitting signals occupying a wide bandwidth collimated beam for a substantial distance. The system has a coherent light generator modulated at a wide bandwidth and a reflecting mirror system that radiates the modulated coherent light generated in a selected direction and spreads the said coherent light into a collimated beam having a safe energy level distribution. A coherent light receiving module in alignment with the radiated coherent light beam decollimates and focusses the coherent beam on a light sensor. Subsequently the communications signal is distributed to end users through cable systems. The coherent light generator is preferably a semiconductor coherent light generating diode and includes a temperature monitoring and regulating system which maintains coherent light generator at an optimum operating temperature for peak output levels.
REFERENCES:
patent: 796254 (1905-08-01), Hartmann et al.
patent: 2153709 (1939-04-01), Bournisien
patent: 4330204 (1982-05-01), Dye
patent: 4603975 (1986-08-01), Cinzori
patent: 4665707 (1987-05-01), Hamilton
patent: 4729061 (1988-03-01), Brown
Casanova Alberto L.
Rist Bruno A.
Beek Leslie Van
Griffin Robert L.
O'Reilly David
Telescript Industries, Inc.
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