Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-05-03
1981-01-20
Safourek, Benedict V.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9615, 370 1, H04B 900
Patent
active
042464757
ABSTRACT:
In an optical data bus system, a fail-safe optical repeater-amplifier assly is provided by light energy amplifying means connected in the data bus for developing gain of signal strength for light signals transmitted along the data bus in a known direction. The light energy amplifying means is connected in parallel with a passive, non-amplifying light path, the light path having an optical length for impressing a delay on light signals passing therethrough which is substantially equal to the optical delay imposed by transmission through the light energy amplifying means. The fail-safe optical repeater-amplifier assembly can be of unidirectional or bidirectional type; the passive non-amplifying light path connected in parallel with the light energy amplifying means can include partially reflective surfaces to provide diversion of light signals out of the passive non-amplifying light path or into the passive non-amplifying light path or in both directions to provide embodiments of the present invention in the form of either a unidirectional or bidirectional tee coupler.
REFERENCES:
patent: 1981999 (1934-11-01), French
patent: 4112293 (1978-09-01), Kach
Coles Edward L.
McLaren John W.
Rubens George J.
Safourek Benedict V.
Sciascia Richard S.
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