SE8900804D0 - SET TO DETECT EXTERNAL POWER ON AN OPTICAL CABLE - Google Patents

SET TO DETECT EXTERNAL POWER ON AN OPTICAL CABLE

Info

Publication number
SE8900804D0
SE8900804D0 SE8900804A SE8900804A SE8900804D0 SE 8900804 D0 SE8900804 D0 SE 8900804D0 SE 8900804 A SE8900804 A SE 8900804A SE 8900804 A SE8900804 A SE 8900804A SE 8900804 D0 SE8900804 D0 SE 8900804D0
Authority
SE
Sweden
Prior art keywords
rays
fibre
radiation
optical cable
pencils
Prior art date
Application number
SE8900804A
Other languages
Swedish (sv)
Other versions
SE8900804L (en
SE463337B (en
Inventor
Stefan Karlsson
Original Assignee
Stefan Karlsson
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 Stefan Karlsson filed Critical Stefan Karlsson
Priority to SE8900804A priority Critical patent/SE463337B/en
Publication of SE8900804D0 publication Critical patent/SE8900804D0/en
Publication of SE8900804L publication Critical patent/SE8900804L/en
Publication of SE463337B publication Critical patent/SE463337B/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The present invention relates to a method of detecting external influence on an optical cable. According to the method, for the purpose of monitoring, coherent radiation is transmitted in at least one single-mode fibre, with a wavelength below the limit wavelength of the fibre, which results in the radiation being propagated in a number of modes. On the receiving side, the monitoring radiation is then divided into two pencils of rays, each comprising the entire interference pattern which is formed during transmission in the fibre. These pencils of rays are then plane-polarized in two different directions, and the amplitude and/or content in terms of frequency of each pencil of rays is detected. From this, a signal is produced, which is a measure of their condition in terms of amplitude and/or frequency. Finally, an alarm function is initiated when the signal exceeds predetermined values with regard to time and/or level. <IMAGE>
SE8900804A 1989-03-08 1989-03-08 Method of detecting external influence on an optical cable SE463337B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8900804A SE463337B (en) 1989-03-08 1989-03-08 Method of detecting external influence on an optical cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8900804A SE463337B (en) 1989-03-08 1989-03-08 Method of detecting external influence on an optical cable

Publications (3)

Publication Number Publication Date
SE8900804D0 true SE8900804D0 (en) 1989-03-08
SE8900804L SE8900804L (en) 1990-09-09
SE463337B SE463337B (en) 1990-11-05

Family

ID=20375270

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8900804A SE463337B (en) 1989-03-08 1989-03-08 Method of detecting external influence on an optical cable

Country Status (1)

Country Link
SE (1) SE463337B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5448058A (en) * 1993-04-27 1995-09-05 Litton Systems, Inc. Optical signal detection apparatus and method for preventing polarization signal fading in optical fiber interferometric sensor systems

Also Published As

Publication number Publication date
SE8900804L (en) 1990-09-09
SE463337B (en) 1990-11-05

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