EP1046248A1 - Dispositif et procede de transmission optique en espace libre - Google Patents

Dispositif et procede de transmission optique en espace libre

Info

Publication number
EP1046248A1
EP1046248A1 EP98967175A EP98967175A EP1046248A1 EP 1046248 A1 EP1046248 A1 EP 1046248A1 EP 98967175 A EP98967175 A EP 98967175A EP 98967175 A EP98967175 A EP 98967175A EP 1046248 A1 EP1046248 A1 EP 1046248A1
Authority
EP
European Patent Office
Prior art keywords
module
holder
wavelength
modulation
transmitting
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP98967175A
Other languages
German (de)
English (en)
Inventor
Robert Otto Renfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1046248A1 publication Critical patent/EP1046248A1/fr
Withdrawn legal-status Critical Current

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
    • H04B10/1123—Bidirectional transmission
    • H04B10/1127—Bidirectional transmission using two distinct parallel optical paths

Definitions

  • the present invention relates to an apparatus and a method for wireless free-space optical transmission.
  • the present invention is also intended to provide a device for free-space optical transmission, which also requires only two devices for bidirectional transmission.
  • a device for free-space optical transmission is also to be created, in which only one transmission path has to be adjusted.
  • These new devices should also have a low power consumption, for example 0.5 amperes at 12 V DC and in continuous operation.
  • the free-space optical transmission should take place by means of a light pulse edge modulation, a light pulse phase modulation, a light pulse frequency modulation or further modulation methods derived therefrom.
  • the device according to the invention for the free optical transmission of data, voice, sound or image information comprises at least one transmitter module 2 with a laser diode, transmitter optics 4, preferably a navigation aid and / or a target device 5, one or more circuit boards (n ) and / or one or more hybrid unit (s), one or more adjustment device (s), a connection 6 for the common inlet of current and control pulses, and optionally one or more operating and / or measuring device (s) and / or control signal connections.
  • a longitudinal axis of the receiving module 1 and a longitudinal axis of the transmitting module 2 are arranged parallel to one another and in a plane Ei, the transmitting module 2 is mounted in a holder 7, which is rigidly connected to a base plate 8, and the receiving module 1 is in a holder 9 mounted, which is rigidly connected to a base plate 8.
  • the transmitter module 2 can be moved forwards and backwards with respect to its position in a first holder 7 and the receiver module 1 can be moved forwards and backwards with respect to its position in a second holder 9, part of the second holder in its vertical and horizontal Position to the base plate 8 is movable.
  • the transmitter module 2 is particularly preferably rotatable about its longitudinal axis within its holder 7 and / or the receiver module in its holder 9 and contains the laser diode in the transmitter module 2 and / or the avalanche photodiode in the receiver module 1 in a conically tapered holder.
  • FIG. 1 shows a possible arrangement of the device according to the invention
  • FIG. 2 shows a front view of a preferred embodiment of the device according to the invention
  • FIG. 3 shows a side view of a preferred embodiment of the device according to the invention
  • FIG. 4 shows a rear view of a preferred embodiment of the device according to the invention
  • FIGS. 1-4 Some exemplary embodiments of the present invention are described below. Reference is generally made to FIGS. 1-4.
  • a preferred embodiment for the transmission of voice, sound, image and / or data information comprises the following 4 basic elements: a transmitting and receiving unit, comprising the inventive one
  • a power supply unit a headset with cable and plug, and a connecting cable with plug and coupling.
  • the above-mentioned transmission and reception unit comprises the following parts: at least one preferably cylindrical transmission module 2, at least one preferably cylindrical reception module 1, a target device 5 or a navigation aid (not shown), a transmission optics 4, a reception optics 3, a stable housing with a base plate 8, a housing cover, a front plate, a rear plate, a holder 10 with an adjusting device 11 for horizontal adjustment of the above-mentioned transmission
  • an adjusting device 12 for vertical adjustment of the above-mentioned transmitting and receiving unit a transmitting board, a receiving board, an analog / digital and control board, an operating element 13, a connection 6 for the common inlet of current and control pulses, one Signal socket 14 for the input of data signals, a measuring socket 15 for measuring the received signal, and a measuring socket 16 for measuring the transmission signals.
  • one or more hybrid units can also be provided.
  • the above-mentioned power supply unit comprises the following parts: a battery, in particular a Ni / Cd battery, a mains supply 110/230 VAC,
  • Receiver unit as well as for measuring the charging current of the battery.
  • the cylindrical transmitter module 2 comprises a laser diode for the transmission of optical light pulses. It is essential to the invention that the laser diode either has a wavelength in a range between 898 nm and 912 nm, preferably 901 nm - 909 nm, particularly preferably 904 nm - 906 nm, in particular a wavelength of 905 nm, or a wavelength in a range between 260 nm and 274 nm, preferably 263 nm - 271 nm, particularly preferably 266 nm - 268 nm, in particular a wavelength of 267 nm, and is operated in pulsed mode.
  • the laser diode either has a wavelength in a range between 898 nm and 912 nm, preferably 901 nm - 909 nm, particularly preferably 904 nm - 906 nm, in particular a wavelength of 905 nm, or a wavelength in a range between 260
  • a light pulse edge modulation, a light pulse phase modulation, a light pulse frequency modulation or further modulation methods derived therefrom are particularly suitable as the modulation method.
  • the laser diode is preferably mounted in a tapered holder.
  • the tapered holder is preferred because it enables the greatest possible number of adjustments.
  • the transmitter module 2 preferably also comprises a multi-stage amplifier unit and the impedance converters required for this. It is preferred to use extremely low-noise transistors, for example gallium arsenide transistors.
  • the transmitter module 2 also includes sockets for the current and signal supply and for measuring the transmit signals.
  • the cylindrical receiving module 1 comprises a photodiode, in particular an avalanche photodiode, for receiving optical light pulses.
  • Light pulses of the type mentioned above are preferred.
  • the receiving optics 3 are preferably equipped with a light filter which limits the bandwidth of the light frequency spectrum in favor of better utilization of the preferred light frequency of 905 nm or 267 nm and is in particular a bandpass filter.
  • the photodiode is in turn mounted in a tapered holder according to the above information.
  • the laser diode and the avalanche photodiode are preferably adjusted and possibly fixed such that the laser diode is in the focal point of the transmitting optics 4 and the avalanche photodiode is in the focal point of the receiving optics 3.
  • the receiving module 1 preferably also comprises a low-noise, broadband video signal amplifier unit and the control loops required for this to optimally adjust the amplifier intensity of the video signal amplifier unit.
  • the receiving module 1 also includes sockets for the current and signal supply and for measuring the received signals.
  • the target device 5 is connected to the base plate 8, movable in its longitudinal axis and arranged between the receiving optics 3 and the transmitting optics 4.
  • the receiving module 1 and the transmitting module 2 are preferably arranged in a horizontal plane Ei, the target device 5 is arranged above or below the plane Ei and the target device 5 is a telescopic sight of the conventional type.
  • the transmission optics 4 can be a commercially available lens for cameras; for example a lens with a focal length of 135 mm and a light width of 55 mm.
  • the aperture of the objective is preferably opened as far as possible so that as much light as possible can be emitted through the objective lenses.
  • the receiving optics 3 can in turn be a commercially available lens for cameras; for example a lens with a focal length of 135 mm and with a light width of 55 mm of the type described above.
  • the diaphragm of the lens is preferably opened as far as possible so that as much light as possible can be captured through the objective lenses.
  • the stable housing mentioned above can be made from a suitable metal, a suitable alloy or from a plastic reinforced with carbon fibers.
  • the base plate 8 and a housing are advantageously connected to such a carrying device that both the base plate 8 and the housing can be moved in the horizontal and vertical directions, in particular pivoted horizontally and tilted vertically.
  • the transmitter board, the receiver board and the analog / digital and control board each have all the necessary electronic, signal-processing components in the form of passive and active components of the conventional type.
  • the control loops mentioned above can be adjusted in the receiving module 1 using the operating element 13.
  • the device according to the invention is suitable for unidirectional or bidirectional transmission. In simplex, semiduplex or full duplex operation of the two transmitting and receiving units, no immobile solid objects, such as a wall, may interrupt the line of sight.
  • the power consumption when operating the transmitting and receiving units is so low, about 0.5 amperes at 12 V DC and in continuous operation, because a low transmitting power is sufficient to maintain the connection between the two transmitting and receiving units mentioned.
  • the radiation opening angle of the transmission module 2 is usually only about 2 milliradians.
  • the two transmitting and receiving units can be used permanently, temporarily stationary or mobile.
  • the two transmitting and receiving units can also be used, for example, as a connecting link between two glass fiber connections.
  • one or more relay stations can be set up.
  • One or more relay station (s) can also be used to extend the transmission distance.
  • a station stood behind a window, which was covered with condensation.
  • Signals between two stations are transmitted unidirectionally or bidirectionally through the atmosphere with the help of light beams.
  • light beams are used which either have a wavelength in a range between 898 nm and 912 nm, preferably 901 nm - 909 nm, particularly preferably 904 nm - 906 nm, in particular a wavelength of 905 nm, or a wavelength in a range between 260 nm and 274 nm, preferably 263 nm - 271 nm, particularly preferably 266 nm - 268 nm, in particular a wavelength of 267 nm.
  • the signals are encoded by pulse modulation of the light beams.
  • the signals are preferably encoded by a light pulse edge modulation, a light pulse phase modulation, a light pulse frequency modulation or further modulation
  • the invention discloses a free communication device which is characterized by extensive weather independence and thus a large range and high transmission rate with low laser power.
  • Other advantages relate to the high level of security against interference, eavesdropping and sighting.
  • Possible areas of application include civil and military radio relay (mobile and / or stationary), the mobile network and telephony in the general.
  • the device according to the invention and the method according to the invention for open-space laser communication is also useful as an alternative to laying optical fibers, in particular for bridging difficult terrain.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un dispositif de transmission optique en espace libre destiné à des données, la parole, des sons et des images. Ce dispositif comprend un module d'émission (2) comportant une diode laser, un dispositif optique d'émission (4), un module de réception (1) doté d'une photodiode à avalanche, un système d'aide à la navigation et/ou un dispositif de visée (5), au moins une platine de commutation et/ou au moins une unité hybride, au moins un dispositif d'ajustage et un connecteur (6) destiné à l'admission commune de courant et d'impulsions de commande. Selon le procédé de l'invention, des impulsions lumineuses modulées sont envoyées à 904 nm ou 267 nm. Pour une transmission bidirectionnelle, le module d'émission (2), le module de réception (1) et une lunette de visée (5) sont assemblés sur une plaque de base mais peuvent être réglés séparément. Ce dispositif, très simple à installer, convient à la communication optique sur plusieurs kilomètres dans de mauvaises conditions météorologiques et de visibilité.
EP98967175A 1998-10-22 1998-10-22 Dispositif et procede de transmission optique en espace libre Withdrawn EP1046248A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH1998/000454 WO2000025452A1 (fr) 1998-10-22 1998-10-22 Dispositif et procede de transmission optique en espace libre

Publications (1)

Publication Number Publication Date
EP1046248A1 true EP1046248A1 (fr) 2000-10-25

Family

ID=4551362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98967175A Withdrawn EP1046248A1 (fr) 1998-10-22 1998-10-22 Dispositif et procede de transmission optique en espace libre

Country Status (2)

Country Link
EP (1) EP1046248A1 (fr)
WO (1) WO2000025452A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277303A (en) * 1966-02-01 1966-10-04 Gen Dynamics Corp Combined binocular and optical communication device
US4493114A (en) * 1983-05-02 1985-01-08 The United States Of America As Represented By The Secretary Of The Navy Optical non-line-of-sight covert, secure high data communication system
US5680241A (en) * 1992-12-30 1997-10-21 Canon Kabushiki Kaisha Optical space communication
JP3302141B2 (ja) * 1993-11-16 2002-07-15 キヤノン株式会社 光空間通信方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0025452A1 *

Also Published As

Publication number Publication date
WO2000025452A1 (fr) 2000-05-04

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