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A spliced optical fiber with splice protection, current sensor with such spliced optical fiber and method for protecting a spliced optical fiber

A polarization-maintaining optical fiber and optical fiber technology, applied in polarization optical fiber, cladding optical fiber, and current-only measurement, etc., can solve problems such as short shelf life, and achieve the effect of accurate PER change and simplified protection process.

Pending Publication Date: 2020-11-24
ABB POWER GRIDS SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disadvantages of this method include sensitive storage and use conditions and relatively short shelf life of the recoating material, in addition to the need for expensive UV fiber recoating machines and high quality splicers to ensure high strength splices

Method used

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  • A spliced optical fiber with splice protection, current sensor with such spliced optical fiber and method for protecting a spliced optical fiber
  • A spliced optical fiber with splice protection, current sensor with such spliced optical fiber and method for protecting a spliced optical fiber
  • A spliced optical fiber with splice protection, current sensor with such spliced optical fiber and method for protecting a spliced optical fiber

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Embodiment Construction

[0060] The term "spliced ​​optical fiber" refers to an optical fiber obtained by splicing two optical fibers using a splicing method. For reasons of simplification, spliced ​​fiber is considered a general term and may thus include the protective structure according to the invention, but may also refer only to the fact that splicing has been performed, depending on the context. In particular, this term should also emphasize that, for the purposes of the present invention, it is immaterial whether or not the spliced ​​sections of spliced ​​optical fibers have been treated in any way before applying the splice protection according to the present invention.

[0061] The term "polarization extinction ratio", PER, refers to the conventional definition as the ratio of the light intensity of an undesired polarization state in a polarization maintaining fiber to the light intensity of a desired polarization state in a polarization maintaining fiber; that is, the smaller the polarization...

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Abstract

The invention relates to a spliced optical fiber (2) comprising a first and second polarization-maintaining optical fiber (3a, 3b) connected at ends by splicing; to fiber optic current sensors; and toa method for protecting the spliced optical fiber (2) against mechanical stress and / or humidity. A protection tube (7) is arranged around the spliced optical fiber (2) in a splice section (3) of thespliced optical fiber (2). A first (11a) and second end (11b) of the protection tube (7) is sealed to the spliced optical fiber (2) by first and second sealing arrangement (9) for protecting the splice (3).

Description

technical field [0001] The invention relates to a spliced ​​optical fiber, an optical fiber current sensor comprising such a spliced ​​optical fiber and a method for protecting a splice of a spliced ​​optical fiber according to the independent claims. Background technique [0002] Many fiber optic applications require splicing of fibers. For applications involving polarization-maintaining (PM) fibers, the polarization state of light can only be maintained if the fiber axes are well aligned at the splice because of the polarization extinction ratio (PER), a number that represents the ratio of power to polarization crosstalk , by X=tan 2 α is given, where α is the angular misalignment. [0003] One such application is the fiber optic current sensor (FOCS). FOCS uses light polarization to measure current. FOCS systems exploit the Faraday effect, which converts a magnetic field generated around a current-carrying conductor into a phase shift between orthogonal circular polar...

Claims

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Application Information

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IPC IPC(8): G02B6/255
CPCG02B6/2558G02B6/255G01R15/24G01R19/0092G02B6/024
Inventor 顾逊P·加布斯
Owner ABB POWER GRIDS SWITZERLAND AG
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