A kind of Rayleigh scattering enhanced optical fiber and its preparation method

A technology of Rayleigh scattering and fabrication method, applied in cladding fiber, multi-layer core/cladding fiber, optics, etc., can solve the problems of enhanced fiber core scattering, limitation of measurable range, etc., to achieve low transmission loss, The effect of increasing Rayleigh scattering intensity, enhancing sensing accuracy and sensing distance

Active Publication Date: 2022-05-10
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing femtosecond laser-fabricated scattering-enhanced structure inevitably has high transmission loss due to the enhanced scattering of the fiber core, and the measurable range is limited

Method used

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  • A kind of Rayleigh scattering enhanced optical fiber and its preparation method
  • A kind of Rayleigh scattering enhanced optical fiber and its preparation method
  • A kind of Rayleigh scattering enhanced optical fiber and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] exist figure 1 , 2 Among them, a Rayleigh scattering-enhanced optical fiber in this embodiment has a waveguide 1-3 written on the cladding 1-1 of the single-core optical fiber 1 along the direction of the center line, and the waveguide 1-3 is parallel to the core 1-2. The distance between the waveguide 1-3 and the fiber core 1-2 is 6 μm, and the length of the waveguide 1-3 is 2 cm.

[0031] The manufacturing method of the Rayleigh scattering enhanced optical fiber of this embodiment consists of the following steps:

[0032] S1. Optical fiber pretreatment

[0033] First take a section of single-core optical fiber 1, clean the pre-prepared part of the optical fiber with alcohol, and use a fusion splicer to weld one end of the optical fiber to the jumper head of the single-mode optical fiber;

[0034] S2. Fiber Placement

[0035] Place the cleaned single-core optical fiber in step S1 on a glass slide, immerse the prepared part of the single-core optical fiber with a re...

Embodiment 2

[0044] In this embodiment, a Rayleigh scattering-enhanced optical fiber has a waveguide 1-3 written on the cladding 1-1 of the single-core optical fiber 1 along the direction of the center line, and the waveguide 1-3 is parallel to the core 1-2. The distance between the waveguide 1-3 and the fiber core 1-2 is 1.5 μm, and the length of the waveguide 1-3 is 2 cm.

[0045] In the manufacturing method of the Rayleigh scattering-enhanced optical fiber of this embodiment, steps S1 and S2 are the same as in embodiment 1. After the single-core optical fiber 1 is placed in step S3, the processing parameters are set in the software of the three-dimensional translation stage, that is, the pre-processed The length of the cladding waveguide is set to 2cm, the power of the femtosecond laser is set to 0.8μW, the repetition frequency is set to 200Hz, the wavelength of the femtosecond laser is 800nm, and the pulse width is 50fs. Adjust the focus position of the femtosecond laser so that the dia...

Embodiment 3

[0047] In this embodiment, a Rayleigh scattering-enhanced optical fiber has a waveguide 1-3 written on the cladding 1-1 of the single-core optical fiber 1 along the direction of the center line, and the waveguide 1-3 is parallel to the core 1-2. The distance between the waveguide 1-3 and the fiber core 1-2 is 10 μm, and the length of the waveguide 1-3 is 2 cm.

[0048] In the manufacturing method of the Rayleigh scattering enhanced optical fiber of this embodiment, steps S1 and S2 are the same as in embodiment 1. After the single-core optical fiber is placed in step S3, the processing parameters are set in the software of the three-dimensional translation stage, that is, the pre-processed package The length of the layer waveguide is set to 2cm, the power of the femtosecond laser is set to 2μW, the repetition rate is set to 500Hz, the wavelength of the femtosecond laser is 800nm, and the pulse width is 50fs. Adjust the focus position of the femtosecond laser so that the diameter...

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Abstract

A Rayleigh scattering enhanced optical fiber and its preparation method. The cladding of a single-core optical fiber or a multi-core optical fiber is engraved with waveguides along the direction of the center line. The waveguides are parallel to the fiber cores. The number of waveguides is the same as the number of fiber cores. The core corresponds to a waveguide; the preparation method of the optical fiber includes: pretreatment of the optical fiber; placing the glass slide carrying the optical fiber on a three-dimensional displacement platform and fixing it; after the processing parameters are set, write the waveguide on the cladding of the optical fiber with a femtosecond laser ; Waveguide scattering test. The present invention uses femtosecond laser to write the waveguide at the cladding of the optical fiber to form a cladding waveguide, which can enhance the back Rayleigh scattered light in the optical fiber and increase the Rayleigh scattering intensity without affecting the transmitted light in the fiber core; On the basis of increased Rayleigh scattering signal strength, it also has extremely low transmission loss, which can enhance the sensing accuracy and sensing distance of distributed technology.

Description

technical field [0001] The invention belongs to the technical field of optical components, and in particular relates to a Rayleigh scattering enhanced optical fiber and a preparation method. Background technique [0002] Optical fiber can be used as an excellent sensor carrier due to its anti-electromagnetic interference, corrosion resistance, high sensitivity, small transmission loss, and large transmission capacity. Taking advantage of the inherent Rayleigh scattering in ordinary optical fibers, optical fibers can be used as distributed sensors. For example, optical frequency domain reflectometry can realize high spatial resolution monitoring of physical parameter changes along the optical fiber. Optical fiber-based distributed acoustic sensing technology utilizes Rayleigh backscattering in optical fibers to locate and recover acoustic information (amplitude, phase, and frequency) on optical fiber links. However, in order to reduce the optical loss in communication, comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/036G01D5/353
CPCG02B6/02123G02B6/03694G01D5/35361G01D5/3538
Inventor 王若晖雒鹏涛陈凤仪乔学光
Owner NORTHWEST UNIV
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