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High-temperature-resisting optical fiber

A high temperature resistant, optical fiber technology, applied in cladding optical fibers, optical waveguides and light guides, etc., can solve problems such as inability to meet reliability, and achieve the effect of simplifying the manufacturing process

Inactive Publication Date: 2013-09-25
JIANGSU HENGTONG OPTICAL FIBER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional optical fibers can only guarantee the long-term service life at an ambient temperature of -60 to 85 degrees, and cannot meet the reliability at higher temperatures

Method used

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  • High-temperature-resisting optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The high temperature resistant optical fiber of the invention comprises a glass core, a cladding wrapped around the glass core and an acrylic resin coating coated on the cladding.

[0017] Acrylic coating is a single layer. The acrylic resin coating is cured by ultraviolet light, and the Young's modulus of the cured acrylic resin coating is 0.6-1 GPa, and the refractive index is 1.4-1.6.

[0018] The manufacturing process of the high temperature resistant optical fiber of the present invention comprises the following steps,

[0019] (1) Use a graphite furnace to melt and draw the light rod, wherein the heating temperature is 1700-2200°C; among them, the light rod used for wire drawing can be different types of light rods, and its outer diameter ranges from 45 to 200mm. The speed is 200~1500m / min.

[0020] (2) Annealing and cooling after melting and drawing, and then entering a single-layer coating mold for one-time coating of acrylic resin coating to obtain an optical...

Embodiment 2

[0025] In Embodiment 1, the fiber type is a high temperature resistant G.652D single-mode fiber. A single-mode optical fiber rod with a diameter of 180mm or 200mm is melted in a high-temperature induction graphite furnace at 2200°C, and enters a single-layer coating mold at a drawing speed of 1000-1500m / min, and is coated with high-temperature resistant acrylic resin to a diameter of 200um. The mode field diameter of the optical fiber is 9.2um at 1310 wavelength, and the attenuation is less than 0.4dB / km; the diameter of the glass cladding is 125um; the diameter of the acrylic resin coating is 200um, and the coating thickness on one side is 37.5um. The typical value of the fiber Nd is 22, which can provide a commercial segment length of more than 60km. The weight loss rate of the optical fiber is less than 5% at 150°C; the added value of attenuation is less than 0.2dB / km; it can guarantee long-term use at 150°C and short-term use at 200°C for more than 7 days.

Embodiment example 3

[0027] In Embodiment 1, the fiber type is a high temperature resistant large core diameter energy transmission fiber. A light rod with a diameter of 60mm is melted and drawn in a high-temperature graphite furnace at 2100°C. The diameter of the glass core layer is 200um; the diameter of the glass cladding is 220um. At a wire drawing speed of 10-50m / min, it enters the coating mold, and one side is coated with a high-temperature resistant acrylic resin with a thickness of 40um and a final coating diameter of 300um. The optical fiber has a large light-receiving area and light-receiving incident angle, and its typical numerical aperture NA is 0.37; attenuation at 850nm wavelength is less than 12dB / km.

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Abstract

The invention discloses a high-temperature-resisting optical fiber. The high-temperature-resisting optical fiber comprises a glass fiber core, a cladding and an acrylic resin coating, wherein the cladding wraps the periphery of the glass fiber core, and the acrylic resin coating coats the cladding. The glass fiber core is made of single mode fibers, multimode fibers, polarization maintaining optical fibers, and rare earth doping optical fibers or large numerical aperture optical fibers. The high-temperature-resisting optical fiber has 100kpsi or 200kpsi screening strength, the Nd typical value is greater than 20, a commercial segment length more than 60km can be provided, and the high-temperature-resisting optical fiber is suitable for remote and long span application. One-time single layer coating is carried out on the high-temperature-resisting optical fiber through acrylic resin, and therefore the processes of optical fiber coating are simplified. The stability of temperature-resisting performance of the optical fiber can be guaranteed under the 150 DEG C environment temperature due to the uniformity of the single coating materials, and the high-temperature-resisting optical fiber can be used for a long time in a severe environment and can also be used for a short time in an environment with 200 DEG C.

Description

technical field [0001] The invention relates to an optical fiber, in particular to a high temperature resistant optical fiber. Background technique [0002] With the expansion of optical fiber application fields, more applications in special environments such as high temperature have been promoted. Such as downhole applications in oil and gas fields, high temperature detection, aerospace military industry and so on. At present, conventional optical fibers can only guarantee the long-term service life at an ambient temperature of -60 to 85 degrees, and cannot meet the reliability at higher temperatures. [0003] In the design of high-temperature optical fibers, high-temperature-resistant acrylic resin, silicone rubber, polyimide, polyetheretherketone, etc. are commonly used as coating materials; and different coating processes are used to manufacture to meet the performance at different temperatures. [0004] Chinese patents CN101726792A; CN102360096A and the like all discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
Inventor 郭浩林俞亮廖平录薛亮贺作为姜建新郝昌平
Owner JIANGSU HENGTONG OPTICAL FIBER TECH