Optical space communication apparatus

Details Optical space communication apparatus Optical space communication apparatus

1996-01-25

1997-11-04

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359159, H04B 1000

Patent

active

056846142

ABSTRACT:
An optical space communication apparatus for communicating by propagating a light signal in free space, including a multiplexer for multiplexing a first pilot signal with a transmission signal, a first converter for converting a first electric signal from the multiplexer into a first light signal, a transmitting optical system for transmitting the first light signal to a party apparatus, a receiving optical system for receiving a second light signal including a second pilot signal, having been transmitted from the party apparatus, a second converter for converting the second light signal into a second electric signal, a first band-pass filter having a pass region including a frequency of the second pilot signal, a first detector for detecting the second electric signal having passed through the first band-pass filter, a second band-pass filter having a pass region not including the frequency of the second pilot signal, a second detector for detecting the second electric signal having passed through the second band-pass filter, an adjuster controlled by a controller, for adjusting an angle of the receiving optical system, and a frequency variable device for making variable a cut-off frequency of a servo system loop filter for the controller, based on signals from the first and second detectors.

REFERENCES:
patent: 3566128 (1971-02-01), Arnuad
patent: 4867560 (1989-09-01), Kunitsugu
patent: 5065455 (1991-11-01), Ito et al.
patent: 5142400 (1992-08-01), Solinsky
patent: 5329395 (1994-07-01), Endo et al.
patent: 5448391 (1995-09-01), Iriyama et al.
patent: 5594580 (1997-01-01), Sakanaka et al.

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