Optical: systems and elements – Holographic system or element
Patent
1989-05-16
1991-11-12
Eisenzopf, Reinhard J.
Optical: systems and elements
Holographic system or element
H04B 1022
Patent
active
050654551
ABSTRACT:
In an optical atmospheric link system for transmitting a light beam carrying an information signal between a transmitter and a receiver which is located apart from the transmitter, the transmitter includes a light source for generating the first light beam modulated with the information signal, a first optical system for transmitting the light beam toward the receiver, a second optical system for turning at least a portion of the light beam, and a third optical system for observing the light beam turned by the second optical system and the receiver. Also, the receiver includes a first detector for receiving the first light beam transmitted from the transmitter through the first optical system, detecting a relative position of the first light beam received and the receiver and for generating a position error signal, a second light source for generating a second light beam modulated with the position error signal, and a second optical system for transmitting the second light beam generated by the second light source toward the transmitter, wherein the transmitter further includes a second detector for receiving the second light beam transmitted from the receiver through the second optical system and demodulating the second light beam to obtain the position error signal, and a position control circuit for controlling a position of the transmitter according to the position error signal obtained by the second detector so that the light beam is directed toward the receiver.
REFERENCES:
patent: 3504182 (1970-03-01), Pizzurro
patent: 3511998 (1970-05-01), Smokler
patent: 3566126 (1971-02-01), Lang
patent: 4867560 (1989-09-01), Kunitsugu
Auer, "Pointing, Aquisition and Tracking for Intersatellite Optical Data Links", Proc. ESA Workshop on Space Laser Applications and Technology, Les Diablerets, Mar. 26-30, 1984.
Ito Yujiro
Kusaka Satoshi
Suzuki Koji
Eisenzopf Reinhard J.
Pascal L.
Shaw, Jr. Philip M.
Sony Corporation
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