System for transmitting a beam in the air

Details System for transmitting a beam in the air System for transmitting a beam in the air

1993-08-04

1995-10-10

Boudreau, Leo H.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, 359191, H04B 1000

Patent

active

054575613

ABSTRACT:
A system for transmitting information with a coherent beam being propagatable in the air is arranged to include a transmitting device having a modulator and an emitting circuit and a receiving device having a generator, a mixer, a frequency discriminating circuit, and reproducing circuit. The modulator modulates a reference light frequency (wavelength) or phase of a coherent beam to be emitted from a light source according to the signal. The emitting circuit emits the modulated beam as a divergent beam having such a power density as being safe to human eyes. The generator generates a coherent locally oscillated beam. The mixer mixes the signal beam with the locally oscillated beam and photoelectric-converts the mixed beam. The frequency discriminating circuit frequency-discriminates the a.c. component of the photoelectric-converted output. The reproducing circuit reproduces a signal from the output of frequency discriminating circuit. Any one of the transmitting device and the receiving device has a function of keeping a relative light frequency difference (wavelength difference) between the signal beam and the locally oscillated beam constant.

REFERENCES:
patent: 3970839 (1976-07-01), Javan
patent: 5249072 (1993-09-01), Ichimura et al.
"Current State and Future of Optical Communication Technique," edited by Electric Communication Technique Council, 1987.
Conference Digest, 12th IEEE International Semiconductor Laser Conference, E-7, pp. 72-73, Y. Nakano et al.
"O plus E" Jan., 1980, pp. 82-131.
"Electric Communication Society Journal" Aug. 1986, pp. 816-823.
Koji Goto et al, Effects of Antenna Pointing Errors on the Design of Heterodyne Optical Intersatellite Communications, Institute of Electronics, Information and Communication Engineering pp. 279-286, Jun. 1990, Tokyo Japan.
Goodwin et al, "Optical Heterodyne Communications Experiments at 10.6.mu.", IEEE Journal of Quantum Electronics, pp. 612-617, vol. 4, No. 10, Oct. 1968, New York.
Leeb, "Heterodyne and Homodyne Detection in Optical Space Communications", Optical Space Communication Apr. 1989, Paris FR, pp. 216-227.

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