Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-09-09
1990-02-20
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455600, H04B 900
Patent
active
049033379
ABSTRACT:
A fiber-optic switch uses a single optical fiber for two-way communication with light. A switching mechanism has no electrical part and is thus appropriate for placement in an area having explosive or combustible material. The optical fiber can be cut to length in the field and can be installed without special tools or training. The fiber is held in place by a clip that is constrained to compress the fiber and grip it securely. A snap-action mirror reflects light back into the fiber in one position and does not reflect it in another position. An electronic circuit provides pulsed light and determines coincidence of sent and received pulses to discriminate against operation of the switch by ambient light or other spurious signals.
REFERENCES:
patent: 4091273 (1978-05-01), Fuller
patent: 4662003 (1987-04-01), Eichweber
patent: 4727593 (1988-02-01), Goldstein
patent: 4731879 (1988-05-01), Sepp
Franks Terry E.
Liu Jinde
Newell Edwin R.
Beek L. Van
Griffin Robert L.
Reynolds Donald P.
Square D Company
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