Automatic gain control for free-space optical telecommunications

Details Automatic gain control for free-space optical telecommunications Automatic gain control for free-space optical telecommunications

1997-05-01

2000-02-29

Hofsass, Jeffery A.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359154, 359159, 359194, H04B 1000

Patent

active

060316489

ABSTRACT:
Free-space optical transmission of analog information is facilitated by transmitting constant-amplitude pilot information with the other information. The amount of attenuation of the pilot information at the receiver is detected and used to control the amount by which received information is amplified. In this way the deleterious effects of free-space optical attenuation are substantially eliminated. The pilot information may be transmitted either via its own separate light frequency or wavelength, or as a distinguishable part of a larger quantity of information that is used to modulate one light frequency or wavelength.

REFERENCES:
patent: 3546465 (1970-12-01), Arnaud
patent: 3566128 (1971-02-01), Arnaud
patent: 4271503 (1981-06-01), Eumurian et al.
patent: 5390185 (1995-02-01), Hooijmans et al.
patent: 5610748 (1997-03-01), Sakanaka et al.
patent: 5617240 (1997-04-01), Hergault et al.
patent: 5768000 (1998-06-01), Tajima

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