WO2002041533A3 - Free space communication receiver unit with controllable power attenuator - Google Patents

Free space communication receiver unit with controllable power attenuator Download PDF

Info

Publication number
WO2002041533A3
WO2002041533A3 PCT/HU2001/000114 HU0100114W WO0241533A3 WO 2002041533 A3 WO2002041533 A3 WO 2002041533A3 HU 0100114 W HU0100114 W HU 0100114W WO 0241533 A3 WO0241533 A3 WO 0241533A3
Authority
WO
WIPO (PCT)
Prior art keywords
photo
detector
free space
receiver unit
communication receiver
Prior art date
Application number
PCT/HU2001/000114
Other languages
French (fr)
Other versions
WO2002041533A2 (en
Inventor
Bela Gyoeri
Original Assignee
Laserbit Kommunikacios Rt
Bela Gyoeri
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laserbit Kommunikacios Rt, Bela Gyoeri filed Critical Laserbit Kommunikacios Rt
Priority to AU2002218424A priority Critical patent/AU2002218424A1/en
Publication of WO2002041533A2 publication Critical patent/WO2002041533A2/en
Publication of WO2002041533A3 publication Critical patent/WO2002041533A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/112—Line-of-sight transmission over an extended range
    • H04B10/1121—One-way transmission

Abstract

A free space communication receiver unit (14) comprises a photo-detector (41) for detecting the light intensity of an incoming light beam (18), and an optical lens system (42) for focusing the incoming light beam (18) onto the photo-detector (41). Variable optical power attenuation means is provided between the lens system (42) and the photo-detector (41) for the attenuation of the optical power incident on the photo-detector (41). The attenuation means comprises an aperture (46) on the optical axis (A) between the lens system (42) and the photo-detector (41), in a region where the effective diameter of the incoming light beam (18) is varying as a function of the position along the optical axis (A). The aperture (46) may be translated along the optical axis in the region, so that the effective optical power passing through the aperture (46) varies as a function of the position along the optical axis (A).
PCT/HU2001/000114 2000-11-17 2001-11-15 Free space communication receiver unit with controllable power attenuator WO2002041533A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002218424A AU2002218424A1 (en) 2000-11-17 2001-11-15 Free space communication receiver unit with controllable power attenuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HUP0004568 2000-11-17
HU0004568A HU0004568D0 (en) 2000-11-17 2000-11-17

Publications (2)

Publication Number Publication Date
WO2002041533A2 WO2002041533A2 (en) 2002-05-23
WO2002041533A3 true WO2002041533A3 (en) 2002-08-15

Family

ID=89978769

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU2001/000114 WO2002041533A2 (en) 2000-11-17 2001-11-15 Free space communication receiver unit with controllable power attenuator

Country Status (3)

Country Link
AU (1) AU2002218424A1 (en)
HU (1) HU0004568D0 (en)
WO (1) WO2002041533A2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307294A (en) * 1980-03-04 1981-12-22 Campbell Duncan B Electro-mechanical control means for space communication receiver
US4330870A (en) * 1980-09-05 1982-05-18 Datapoint Corporation Optical data link
US5065455A (en) * 1988-05-20 1991-11-12 Sony Corporation Optical atmospheric link system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307294A (en) * 1980-03-04 1981-12-22 Campbell Duncan B Electro-mechanical control means for space communication receiver
US4330870A (en) * 1980-09-05 1982-05-18 Datapoint Corporation Optical data link
US5065455A (en) * 1988-05-20 1991-11-12 Sony Corporation Optical atmospheric link system

Also Published As

Publication number Publication date
AU2002218424A1 (en) 2002-05-27
HU0004568D0 (en) 2001-02-28
WO2002041533A2 (en) 2002-05-23

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