Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-05-13
1989-07-18
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455609, 455616, 356 5, 356 28, H04B 900, G01P 336
Patent
active
048500410
ABSTRACT:
The relative intensity of the transmit beam and the local oscillator beam in a ladar diplexer can be continuously adjusted during operation by using a rotatable retardation plate with a slightly inclined "C" axis to turn a polarized laser beam into a composite beam having two components polarized in mutually perpendicular directions. The relative intensity of the components is adjustable by varying the inclination of the "C" axis. The composite beam is applied to the same polarizer element normally used to separate the return signal from the transmit beam. The polarizer acts as the beam splitter which separates the local oscillator beam from the transmit beam. The described configuration also saves one beam splitter and allows improved packaging and alignment of the diplexer.
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Chudy John S.
Roberts Dudley A.
Ford Aerospace & Communications Corporation
Griffin Robert L.
Radlo Edward J.
Telesz Jr. Andrew J.
Weissenberger Harry G.
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