Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-03-11
1983-09-27
Lee, John D.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9620, 350331R, 455601, G02B 726
Patent
active
044065132
ABSTRACT:
Apparatus for transmitting an optical information signal from an input fiber optic cable to an output fiber optic cable includes a first regenerative repeater path having a first diode for converting the optical information signal to an electrical signal, an amplifier for amplifying the electrical signal, and a second diode for converting the amplified electrical signal to an amplified optical information signal and for supplying this latter signal to the output fiber optic cable; and a second by-pass path including a fiber optic liquid crystal gate having an input cable with a first optical end face, an output cable with a second optical end face in opposing relation to the first optical end face and separated therefrom, and a liquid crystal window disposed between the optical end faces and adapted to be supplied with a signal from the repeater path, with the liquid crystal window being automatically rendered transparent when no signal is supplied thereto, indicating a power failure to the repeater path or a malfunction in the repeater path, so as to pass the optical information signal from the input fiber optic cable to the output fiber optic cable, and with the liquid crystal window being rendered opaque to block any optical signal from passing therethrough when a signal from the repeater path is supplied thereto, indicating no power failure to or malfunction in the repeater path.
REFERENCES:
patent: 3801819 (1974-04-01), Ohnsorge
patent: 3851167 (1974-11-01), Levine
patent: 3943358 (1976-03-01), Reymond et al.
patent: 4148558 (1979-04-01), Schuck
patent: 4246475 (1981-01-01), Altman
Burke et al., "Fiber Optic Repeater Bypass Switch," IBM Tech. Discl. Bull., vol. 18, No. 2, Jul. 1975, pp. 481-482.
Comerford, "Fiber-Optic Bypass Switch," IBM Tech. Discl. Bull., vol. 21, No. 10, Mar. 1979, pp. 4280-4281.
Soref, "Fiber-Optic Switching With Liquid Crystals," Conf. Proc. of SPIE, Washington, D.C. Apr. 1979, pp. 124-132.
Rawson et al., "A Fiber Optical Relay for Bypassing Computer Network Repeaters", Opt. Engr., vol. 19, No. 4, Jul./Aug. 1980, pp. 628-629.
Cermetek, Inc.
Eslinger Lewis H.
Lee John D.
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