Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-01-12
1980-06-03
Britton, Howard W.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350174, 350358, 370 4, 455609, H04B 900
Patent
active
042063477
ABSTRACT:
A system for multiplexing or demultiplexing pulsed laser radiation having an acousto-optical device which is electrically controlled to switch a common path of high pulse rate laser radiation between a plurality of spatially distinct paths for relatively lower pulse rate laser radiation at which the pulses are sequenced according to a predetermined time pattern. The acousto-optical element typically includes a Bragg cell which is electrically driven by a set of distinct frequencies, causing deflection of radiation passing therethrough at a predetermined set of angles whereby pulsed radiation on a single path may be distributed onto the plural separate paths or radiation on plural separate paths of time-sequenced pulses of radiation can be combined into a single path of augmented pulse rate. The control of the acousto-optical element may be provided by selectively switching the output of a plurality of fixed frequency oscillators of different frequency to the acousto-optical element in accordance with the pattern of pulses on the common or plural distinct paths or a voltage-controlled oscillator may be sequenced through a repeating set of frequencies which are sampled one or more times per sequence to develop an error signal resulting in feedback control over the oscillator to eliminate long-term drift.
REFERENCES:
patent: 3759603 (1973-09-01), Eschler
patent: 3825845 (1974-07-01), Angelbeck
patent: 3845294 (1974-10-01), Indig
patent: 3849604 (1974-11-01), Benes
patent: 3869197 (1975-03-01), Owens
patent: 3873825 (1975-03-01), Jones
Avicola Kenneth
Congleton Robert S.
Hong Gay W.
Britton Howard W.
Jersey Nuclear-AVCO Isotopes, Inc.
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