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Low loss and high temperature resistant optical fiber

A technology with high temperature resistance and low loss, which is applied in the field of low loss and high temperature resistant optical fiber, which can solve the problems that polyimide-coated optical fiber cannot be used, metal-coated optical fiber cannot be used, optical loss, and the length of metal-coated optical fiber is limited.

Active Publication Date: 2018-09-11
WUHAN NORTHERN OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This loss limits the use length of these metal-coated fibers, generally only within 200 meters
However, in many optical sensing applications, such as heavy oil wells, the well depth is often more than 2,000 meters, and the temperature in the well is above 300°C. The optical fiber used for temperature and pressure sensing in the well cannot use metal-coated optical fiber (the optical loss is too large. ), and polyimide-coated optical fibers cannot be used (the working environment temperature is greater than the temperature it can withstand)

Method used

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  • Low loss and high temperature resistant optical fiber
  • Low loss and high temperature resistant optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 Shown is a schematic cross-sectional view of a low loss high temperature optical fiber 101 having a metal coating 106 over a polymer coating 104 . The optical fiber 101 has a core 102 , a cladding 103 surrounding the outer surface of the core 102 , a polymer coating 104 disposed on the outer surface of the cladding 103 , and a metal coating 106 disposed on the polymer coating 104 .

[0026] The core layer 102 is located at the center of the optical fiber 101, and the diameter of the core layer 102 may be more than 1 μm. The cladding layer 103 is disposed on the outer surface of the core layer 102 along the longitudinal axis of the core layer 102 , and the thickness of one side of the cladding layer 103 may be 5 μm or more. The refractive index of the core layer 102 is greater than that of the cladding layer 103 , and the light is confined by the cladding layer 103 in the core layer 102 for total reflection transmission. Materials of the core layer 102 an...

Embodiment 2

[0029] like figure 2 Shown is a schematic cross-sectional view of a low loss high temperature optical fiber 201 having a bonding layer 205 and a metal coating 206 on a polymer coating 204 . The optical fiber 201 has a core 202, a cladding 203 surrounding the outer surface of the core 202, a polymer coating 204 placed on the outer surface of the cladding 203, a bonding layer 205 placed on the outer surface of the polymer coating 204, and an adhesive Metallic coating 206 on the outer surface of junction layer 205 .

[0030] The core layer 202 is located at the center of the optical fiber 201, and the diameter of the core layer 202 is 1 μm or more. The cladding layer 203 is disposed on the outer surface of the core layer 202 along the longitudinal axis of the core layer 202 , and the thickness of one side of the cladding layer 203 is 5 μm or more. The refractive index of the core layer 202 is greater than that of the cladding layer 203 , and the light is confined by the claddi...

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Abstract

The invention relates to a low-loss high-temperature-resistant optical fiber used in the fields of optical fiber communication, optical fiber sensing, and optical fiber energy transmission. Coatings and metal coatings placed on polymer coatings. Optionally, an adhesive layer is provided between the polymer coating and the metal coating, so that the metal coating is more firmly combined with the polymer coating. Compared with the traditional polymer-coated optical fiber without metal coating, the low-loss and high-temperature-resistant optical fiber with metal coating proposed in the present invention can be used without significantly changing the various optical properties and mechanical strength of the optical fiber. The maximum working temperature of the optical fiber is increased by 50°C to 300°C.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication, optical fiber sensing, optical fiber energy transmission, etc., in particular to a low-loss high-temperature-resistant optical fiber with a metal outer coating on a traditional optical fiber polymer coating. Background technique [0002] In order to meet the needs of use in a high temperature environment, the optical fiber must maintain the same or similar optical performance, mechanical strength and reliability as that in normal temperature and normal use environment. [0003] Conventional optical fiber coatings are polymeric materials including acrylate, high temperature acrylate, liquid crystal, Teflon, ETFE and polyimide materials. The optical loss of this type of optical fiber at the optical wavelength of 1310nm and 1550nm is small, generally less than 0.5dB / km. Acrylate-coated optical fibers are widely used in optical fiber communications, and the maximum temperature a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02
Inventor 徐巍张栓民叶亚楠王静
Owner WUHAN NORTHERN OPTOELECTRONICS