WO2003075493A3 - Optical free-space signalling system - Google Patents

Optical free-space signalling system Download PDF

Info

Publication number
WO2003075493A3
WO2003075493A3 PCT/GB2003/000951 GB0300951W WO03075493A3 WO 2003075493 A3 WO2003075493 A3 WO 2003075493A3 GB 0300951 W GB0300951 W GB 0300951W WO 03075493 A3 WO03075493 A3 WO 03075493A3
Authority
WO
WIPO (PCT)
Prior art keywords
distribution node
modulator
light beam
remote terminals
optical free
Prior art date
Application number
PCT/GB2003/000951
Other languages
French (fr)
Other versions
WO2003075493A2 (en
Inventor
Euan Morrison
Alan Edward Green
Andrew White
Nicolas Vasilopoulos
Iain Howieson
Andrew Loach
Maolong Ke
Michael Hands
Original Assignee
Quantumbeam Ltd
Euan Morrison
Alan Edward Green
Andrew White
Nicolas Vasilopoulos
Iain Howieson
Andrew Loach
Maolong Ke
Michael Hands
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
Priority claimed from GB0205117A external-priority patent/GB0205117D0/en
Application filed by Quantumbeam Ltd, Euan Morrison, Alan Edward Green, Andrew White, Nicolas Vasilopoulos, Iain Howieson, Andrew Loach, Maolong Ke, Michael Hands filed Critical Quantumbeam Ltd
Priority to AU2003214383A priority Critical patent/AU2003214383A1/en
Publication of WO2003075493A2 publication Critical patent/WO2003075493A2/en
Publication of WO2003075493A3 publication Critical patent/WO2003075493A3/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
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1149—Arrangements for indoor wireless networking of information
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2201/00—Transmission systems of control signals via wireless link
    • G08C2201/40—Remote control systems using repeaters, converters, gateways
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2201/00—Transmission systems of control signals via wireless link
    • G08C2201/50—Receiving or transmitting feedback, e.g. replies, status updates, acknowledgements, from the controlled devices
    • G08C2201/51—Remote controlling of devices based on replies, status thereof

Abstract

There is described an optical free-space signalling system for signalling between a distribution node and a plurality of remote terminals. Each of the remote terminals includes a light source, a lens system for directing light emitted by the light source to the distribution node, and a detector which detects a modulated light beam from the distribution node and generates an electrical signal which varies in dependence upon data conveyed by the modulated light beam. The distribution node comprises a main receiver for receiving data to be transmitted to the plurality of remote terminals, and a plurality of separate modulator units. Each modulator unit has a housing which supports a retro-reflector which reflects light received from a corresponding remote terminal back to the corresponding remote terminal, and a modulator which modulates the reflected light in accordance with received data to form the modulated light beam. By using plural modulator units, the functionality of each individual modulator unit can be simplified.
PCT/GB2003/000951 2002-03-05 2003-03-05 Optical free-space signalling system WO2003075493A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003214383A AU2003214383A1 (en) 2002-03-05 2003-03-05 Optical free-space signalling system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0205117.5 2002-03-05
GB0205117A GB0205117D0 (en) 2002-03-05 2002-03-05 Free space optical communications technique
GB0214447.5 2002-06-21
GB0214447A GB0214447D0 (en) 2002-03-05 2002-06-21 Optical free-space signalling system

Publications (2)

Publication Number Publication Date
WO2003075493A2 WO2003075493A2 (en) 2003-09-12
WO2003075493A3 true WO2003075493A3 (en) 2003-12-31

Family

ID=27790181

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/000951 WO2003075493A2 (en) 2002-03-05 2003-03-05 Optical free-space signalling system

Country Status (2)

Country Link
AU (1) AU2003214383A1 (en)
WO (1) WO2003075493A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7308202B2 (en) 2002-02-01 2007-12-11 Cubic Corporation Secure covert combat identification friend-or-foe (IFF) system for the dismounted soldier
US7956347B2 (en) 2007-07-11 2011-06-07 Cubic Corporation Integrated modulating retro-reflector
US7859675B2 (en) 2007-11-06 2010-12-28 Cubic Corporation Field test of a retro-reflector and detector assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777660A (en) * 1984-11-06 1988-10-11 Optelecom Incorporated Retroreflective optical communication system
WO1998035328A2 (en) * 1997-02-11 1998-08-13 Scientific Generics Limited Signalling system
WO2000048338A1 (en) * 1999-02-11 2000-08-17 Quantumbeam Limited Optical free space signalling system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777660A (en) * 1984-11-06 1988-10-11 Optelecom Incorporated Retroreflective optical communication system
WO1998035328A2 (en) * 1997-02-11 1998-08-13 Scientific Generics Limited Signalling system
WO2000048338A1 (en) * 1999-02-11 2000-08-17 Quantumbeam Limited Optical free space signalling system

Also Published As

Publication number Publication date
WO2003075493A2 (en) 2003-09-12
AU2003214383A8 (en) 2003-09-16
AU2003214383A1 (en) 2003-09-16

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