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Optical fibers with high-temperature write-through coatings

An optical fiber and optical technology, applied in the direction of cladding fiber, grating fiber, glass fiber, etc., can solve the problems of inefficient grating writing process, lack of thermal stability in high temperature application, stickiness and so on

Pending Publication Date: 2021-06-29
OFS FITEL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such coatings have been found to decompose upon prolonged exposure to temperatures in excess of 100°C, and thus lack the thermal stability required for high temperature applications, such as downhole or in-hole applications operating at temperatures of at least about 150°C
Although RTV silicone-based coatings have demonstrated better thermal stability than urethane acrylate materials, the coated surface is relatively soft and tacky, causing significant handling problems during FBG production
RTV silicone-based coatings also have relatively high UV absorbance levels, resulting in a relatively inefficient grating writing process

Method used

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  • Optical fibers with high-temperature write-through coatings
  • Optical fibers with high-temperature write-through coatings
  • Optical fibers with high-temperature write-through coatings

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Embodiment Construction

[0028] Disclosed herein are optical fibers having a coating of a vinyl-containing silicone polymer (hereinafter "VG-containing silicone polymer"). VG-containing silicone polymer coatings disposed on optical fibers, preferably glass fibers, or on other optical substrates, can have the ability to be written into optical fibers without removing the VG-containing silicone polymer coating or one or more portions within the substrate, thereby allowing high-speed fabrication of thermally and optically robust fiber gratings. The optical device may be a grating, preferably a fiber Bragg grating. An optical fiber may comprise, for example, a glass optical core and a glass cladding.

[0029] The VG-containing silicone polymer WTCs of the present invention can be applied to a variety of optical fibers, including those comprising glass optical cores and glass claddings. Suitable optical fibers may include an inner core having a relatively high index of refraction and an outer cladding ha...

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Abstract

An optically transparent protective coating is described that remains stable at elevated temperatures associated with optical fiber-based sensor applications and is sufficiently transparent to allow for conventional fiber Bragg gratings (FBGs) to be formed by directly writing through the coating. In particular, vinyl group-containing silicone polymers have been found to provide the UV transparency required for a write-through coating (WTC) and promising mechanical properties for protecting the optical fibers, while also being able to withstand elevated temperatures for extended periods of time.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application No. 62 / 776,222, filed December 6, 2018, and incorporated herein by reference. technical field [0003] The present invention relates to optical fibers formed to include grating structures such as fiber Bragg gratings (FBGs), and more particularly to the utilization of protective coatings through which the gratings can be formed directly in the fibers and thereafter in various Fiber-based sensor applications remain stable at elevated temperatures experienced. [0004] Background of the invention [0005] There is an increasing demand for FBGs in many industrial sensing applications because of their high optical signal sensitivity to changes in environmental factors such as temperature, strain, and the like. Traditional methods of forming FBGs in the optical fiber core (and / or cladding surrounding the core) require stripping multiple layers of cladding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/44
CPCG02B6/02395C03C25/105C08G77/20G01K11/3206G02B6/021
Inventor 吴宏超
Owner OFS FITEL LLC