Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-01-24
1990-03-27
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455618, G02F 100
Patent
active
049125257
ABSTRACT:
Apparatus for transmitting optical signals from an unprotected environment to a protected environment are disclosed. The apparatus may take the form of a lightpipe which has a light transmitting core and a cladding material surrounding the core having an index of refraction lower than the core. The lightpipe is aligned with a photodetector by means of a retaining collar. An omnidirectional optical signal collector is also disclosed for receiving optical signals from any direction and relaying them to a secure photodetector.
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Brackett--Photodetector Package--Western Electric Tech. Digest, No. 64--Oct. 1981--p. 3 455/619.
Weik; Fiber Optics and Lightwave Communications Standard Dictionary; Van Nostrand Reinhold Co.; New York; 1981; p. 142.
Griffin Robert L.
Salindong T.
Universal Photonix, Inc.
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