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Optical fiber and preparation method thereof

An optical fiber and quartz optical fiber technology, applied in the field of optical fiber and its preparation, can solve the problems of unsuitability for large-scale high-speed optical fiber drawing, low efficiency, slow curing rate, etc. Effect

Pending Publication Date: 2018-11-13
ZHONGTIAN TECH FIBER OPTICS +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can produce a low-temperature working temperature down to -65°C, it has problems such as slow curing rate and low efficiency, and is not suitable for large-scale high-speed optical fiber drawing

Method used

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  • Optical fiber and preparation method thereof
  • Optical fiber and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] figure 1 is a schematic structural view of the optical fiber provided by the embodiment of the present invention. Such as figure 1 As shown, the optical fiber provided by the embodiment of the present invention includes a silica fiber in sequence from the inside to the outside. The silica fiber includes a core layer 1 and a cladding layer 2. The outer surface of the silica fiber is coated with an inner coating 3 and an outer coating 4 in sequence from the inside to the outside. The coating used in the inner coating 3 is a modified acrylic resin with a glass transition temperature of -50°C to -70°C, a refractive index of 1.4 to 1.5, and an elastic modulus of 0.3 to 0.5MPa after curing; the coating used in the outer coating 4 It is a modified acrylic resin, its refractive index is 1.5-1.6, and its elastic modulus after curing is above 800MPa. The coating used for the inner coating and the coating used for the outer coating have different refractive indices. Both the inn...

Embodiment 2

[0041] Such as figure 1 As shown, the optical fiber provided by the embodiment of the present invention includes a silica fiber in sequence from the inside to the outside. The silica fiber includes a core layer 1 and a cladding layer 2. The outer surface of the silica fiber is coated with an inner coating 3 and an outer coating 4 in sequence from the inside to the outside. The paint used in the inner coating 3 is a modified acrylic resin with a glass transition temperature of -70°C to -80°C, a refractive index of 1.4 to 1.5, a viscosity of 5000 to 6000cps, a viscosity of less than 1000cps at 60°C, and an elastic modulus after curing 0.3-0.5MPa, the elongation after curing is more than 150%, and the tensile strength is more than 0.3Mpa; the coating used in the outer coating 4 is a modified acrylic resin with a refractive index of 1.5-1.6 and a viscosity of 5000-5500cps. The viscosity at 60°C is less than 400cps, the elastic modulus after curing is above 800MPa, the elongation a...

Embodiment 3

[0044] Such as figure 1 As shown, the optical fiber provided by the embodiment of the present invention includes a silica fiber in sequence from the inside to the outside. The silica fiber includes a core layer 1 and a cladding layer 2. The outer surface of the silica fiber is coated with an inner coating 3 and an outer coating 4 in sequence from the inside to the outside. The coating used in the inner coating 3 is a modified acrylic resin, which is made of acrylic resin and a modifier with a content of 8%. The modifier is composed of polyethylene and styrene. The polyethylene here can be linear polyethylene or ring shaped polyethylene; the coating used in the outer coating 4 is a modified acrylic resin, made of acrylic resin and a modifier with a content of 5%, and the modifier is n-butyl acrylate. The coating used for the inner coating and the coating used for the outer coating have different refractive indices, and both the inner coating 3 and the outer coating 4 are formed...

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Abstract

The invention discloses an optical fiber and a preparation method thereof and belongs to the optical fiber field. The optical fiber comprises a quartz optical fiber; the outer surface of the quartz optical fiber is coated with an inner coating and an outer coating sequentially from inside to outside. The optical fiber is characterized in that the glass-transition temperature of a coating materialused for the inner coating ranges from -50 DEG C to -70 DEG C, the refractive index of the coating material used for the inner coating ranges from 1.4 to 1.5, and the post-curing elastic modulus of the coating material of the inner coating ranges from 0.3 to 0.5 MPa; the refractive index of a coating material used for the outer coating ranges from 1.5 to 1.6, and the post-curing elastic modulus ofthe coating material used for the outer coating is 800 MPa or more; the coating material used for the inner coating and the coating material used for the outer coating have different refractive indexes; and the inner coating and the outer coating are both formed by means of ultraviolet curing. The optical fiber can satisfy low attenuation performance and good coating performance required by national standards, can be applicable to a low temperature environment of -70 DEG C to -80 DEG C, and therefore, the temperature application range of the optical fiber can be extended; the preparation process of the optical fiber involves the extremely cold-resistant optical fiber coating materials, the drawing process of the optical fiber is improved, and curing time is reduced, and therefore, preparation process time can be shortened, and preparation efficiency is higher. The preparation method is suitable for continuous production in large quantities.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to an optical fiber and a preparation method thereof. Background technique [0002] Recently, with the rapid development of special optical fiber technology, its application range has been extended to various harsh environment systems such as high temperature, and the requirements for optical and mechanical properties of optical fibers are also increasing. Good optical properties, better play a role in aerospace, military and other fields. At present, relevant people in the industry have conducted a lot of research and production on high-temperature resistant optical fibers, but there are relatively few researches on optical fibers that can adapt to low temperature or even extreme cold conditions. [0003] Patent 201310441152.0 discloses a high-temperature-resistant optical fiber with an operating temperature range of -65 to 300°C. The polyimide coating is an aromatic heterocyclic pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02C03B37/025C03C25/50
CPCG02B6/02395C03B37/025C03C25/50
Inventor 耿培恒曹珊珊王震徐海涛刘志忠薛济萍薛驰
Owner ZHONGTIAN TECH FIBER OPTICS
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