Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-05-23
1989-07-18
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455601, 455612, 34082505, 370 86, 370 1, H04B 900
Patent
active
048500437
ABSTRACT:
A high integrity optical data transmission system connecting a plurality of user I/O devices includes an optical path terminating at each user I/O device at a two port interface having a pair of optical transmitter and a pair of optical receivers for optically communicating the binary logic ONE and ZERO states and the system no data transmission state. A portion of the light transmitted over the optical path is fed back to the interface to control the transmitted light intensity. The two photodiode light receivers are closely matched in electrical characteristics and are biased by adjustable DC voltage sources so that the effects of photodiode dark currents on a trans-impedance amplifier are minimized.
REFERENCES:
patent: 4583088 (1986-04-01), Bux et al.
patent: 4633202 (1986-12-01), Basile et al.
patent: 4654844 (1987-03-01), Mandello
"Military Avionic LANs Point Toward Fiber Optics " by Matthew J. Relis, Defense Electronics, Oct. 1983, pp. 87-106.
Military Standard 1553B-Aircraft Internal Time Division Command/Response Multiplex Data Bus, Notice 1(USAF), Feb. 17, 1980, U.S. Govt. Printing Office, pp. 1-35.
Proposed Military Standard 1773, Aug. 26, 1982, Fiber Optics Mechanization of an Aircraft Internal Time Division Command/Response Multiplex Data Bus pp. 1-30.
Griffin Robert L.
Telesz Jr. Andrew J.
United Technologies Corporation
Williams M. P.
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