GB1218421A - Laser link communication system - Google Patents

Laser link communication system

Info

Publication number
GB1218421A
GB1218421A GB284668A GB284668A GB1218421A GB 1218421 A GB1218421 A GB 1218421A GB 284668 A GB284668 A GB 284668A GB 284668 A GB284668 A GB 284668A GB 1218421 A GB1218421 A GB 1218421A
Authority
GB
United Kingdom
Prior art keywords
laser
laser beam
communication system
transmitted
information
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.)
Expired
Application number
GB284668A
Inventor
Harold R Walker
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.)
Laser Link Corp
Original Assignee
Laser Link Corp
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 Laser Link Corp filed Critical Laser Link Corp
Publication of GB1218421A publication Critical patent/GB1218421A/en
Expired 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
    • H04B10/50—Transmitters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/107—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using electro-optic devices, e.g. exhibiting Pockels or Kerr effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)
  • Radio Relay Systems (AREA)

Abstract

1,218,421. Communication system. LASER LINK CORP. 18 Jan., 1968 [6 Feb., 1967], No. 2846/68. Heading H4R. [Also in Division G1] A communication system comprises a radiofrequency transmitter and receiver, conversion means for frequency modulating a laser beam with the received information and for projecting the laser beam, at least one station for receiving the laser beam and detecting the information, and communication lines for connecting the station output to local utilisation apparatus The system is applied to distributing a television programme particularly using laser transmission from a high city building to adjacent buildings. The system may transmit a pilot whereby the system is switched to substitute an R.F. television transmission system for the laser system in the event of excessive light absorption during fog, smog, or heavy rain. The beams may be expanded to prevent burn damage and may be transmitted in a number of directions, or a single beam may be tapped at a succession of receivers which reflect or retransmit the beam. The modulating element 27, Fig. 7, which may be a Pockels cell of lithium tantalate is included as an element in a Colpitts oscillator, the frequency of which is determined by a varactor 26t acted on by the information input at 30. The laser may have a Brewster's Angle termination 35 from which the beams modulated in their passage between mirrors 34a and 34b are transmitted. Alternatively a laser beam may have its output polarized by a Rochon Prism and the polarization may be rotated.
GB284668A 1967-02-06 1968-01-18 Laser link communication system Expired GB1218421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62316967A 1967-02-06 1967-02-06

Publications (1)

Publication Number Publication Date
GB1218421A true GB1218421A (en) 1971-01-06

Family

ID=24497047

Family Applications (2)

Application Number Title Priority Date Filing Date
GB284668A Expired GB1218421A (en) 1967-02-06 1968-01-18 Laser link communication system
GB4823269A Expired GB1218422A (en) 1967-02-06 1968-01-18 Laser modulator

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB4823269A Expired GB1218422A (en) 1967-02-06 1968-01-18 Laser modulator

Country Status (1)

Country Link
GB (2) GB1218421A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0314101A1 (en) * 1987-10-29 1989-05-03 Alcatel Espace Radiofrequency-optical transmission system, especially in the field of satellite communications
GB2212021A (en) * 1987-11-06 1989-07-12 Stc Plc Radio frequency generator
GB2260665A (en) * 1989-11-09 1993-04-21 Stc Plc Communications using fibre optics and radio

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0314101A1 (en) * 1987-10-29 1989-05-03 Alcatel Espace Radiofrequency-optical transmission system, especially in the field of satellite communications
FR2622754A1 (en) * 1987-10-29 1989-05-05 Alcatel Espace RADIO FREQUENCY OPTICAL TRANSMISSION SYSTEM, IN PARTICULAR IN THE FIELD OF SPACE TELECOMMUNICATIONS
US4928317A (en) * 1987-10-29 1990-05-22 Societe Anonyme Dite: Alcatel Espace Radio-optical transmission system, in particular for space telecommunications
GB2212021A (en) * 1987-11-06 1989-07-12 Stc Plc Radio frequency generator
GB2260665A (en) * 1989-11-09 1993-04-21 Stc Plc Communications using fibre optics and radio
GB2260665B (en) * 1989-11-09 1993-12-15 Stc Plc Communications

Also Published As

Publication number Publication date
GB1218422A (en) 1971-01-06

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