Novel capillary fiber grating and preparation method thereof

A fiber grating and capillary technology, applied in cladding fibers, optical waveguides, light guides, etc., can solve the problems of difficult operation, reduced mechanical strength, poor anti-interference ability, etc., and achieve stable spectral characteristics, low insertion loss, and high stability. sexual effect

Pending Publication Date: 2021-11-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the above-mentioned fiber grating preparation method destroys the outer surface of the fiber cladding, which will greatly damage the strength of the fiber, resulting in a decr...

Method used

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  • Novel capillary fiber grating and preparation method thereof
  • Novel capillary fiber grating and preparation method thereof
  • Novel capillary fiber grating and preparation method thereof

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Effect test

Embodiment 1

[0035] Such as figure 1 Shown is the preparation process of capillary fiber grating prepared by ultraviolet exposure method, including four-layer structure: optical fiber annular cladding, photosensitive resin cladding, inner wall grating, and optical fiber core. The photosensitive resin cladding is located at the central air hole, the fiber core is located in the annular cladding, and the grating is written on the photosensitive resin cladding. The preparation of capillary fiber grating by ultraviolet exposure method includes the following steps:

[0036] Step 1.1: Heat and break the capillary to form a tapered tip with a diameter of about 2 microns. Use a precision electric shift platform to align the capillary filled with photosensitive resin material with the air hole cladding of the capillary fiber, pressurize the syringe, and make the photosensitive resin material fill the air hole in the central air hole of the capillary fiber in Figure 2 (a) to form a photosensitive r...

Embodiment 2

[0043] Experimental device such as figure 1 As shown in Figure 2(b), the scheme of the dual-hole capillary fiber grating prepared by ultraviolet exposure method, the core is located in the center, and two air holes are placed on both sides of the core and distributed symmetrically, each air hole is responsible for a grating array. Concrete preparation method is as follows:

[0044] Step 2.1: Heat and break the capillary to form a tapered tip with a diameter of about 2 microns. Use a precision electric shift platform to align the capillary filled with photosensitive resin material with the air hole cladding of the capillary fiber, pressurize the syringe, and make the photosensitive resin material fill the air hole in the central air hole of the capillary fiber in Figure 2 (b) to form a photosensitive resin cladding;

[0045] Step 2.2: Cut the two ends of the double-bore capillary optical fiber flat with a cutting machine, and fix them on the glass slide. One end is connected ...

Embodiment 3

[0050] As shown in Figure 2(c), it is a schematic diagram of a capillary fiber grating prepared by ultraviolet exposure in a suspended core capillary fiber, wherein the core is located in the fiber cladding, and the grating is located in the photosensitive resin cladding, bound by the photosensitive resin material, The air hole is located at the center. The preparation method comprises the following steps:

[0051] Step 3.1: Heat and break the capillary to form a tapered tip with a diameter of about 2 microns. Use a precision electric displacement platform to align the capillary filled with photosensitive resin material with the air hole cladding of the capillary fiber, pressurize the syringe, and make the photosensitive resin material fill the air hole in the central air hole of the capillary fiber in Figure 2 (c) to form a photosensitive resin cladding;

[0052] Step 3.2: Cut the two ends of the suspended core capillary fiber respectively with a cutting machine and fix them...

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Abstract

The invention provides a novel capillary optical fiber grating and a preparation method thereof. The novel capillary optical fiber grating comprises an optical fiber annular cladding, a photosensitive resin cladding and an optical fiber core, and the optical fiber core is located in the optical fiber annular cladding or hung on the inner wall of the annular cladding; the photosensitive resin cladding is filled in the central air hole of the optical fiber, the refractive index is periodically distributed along the length direction of the optical fiber, and the distance between the photosensitive resin cladding and an optical fiber core is less than 3 microns or direct contact is realized to form weak coupling. A photosensitive resin material is injected into a central air hole of a capillary optical fiber to form a photosensitive resin cladding, an ultraviolet laser beam is adopted to penetrate through a mask plate in a forward incidence mode, an interference pattern is formed through diffraction and transferred into the photosensitive resin cladding, and the refractive index of the photosensitive resin cladding is periodically distributed in the length direction of the optical fiber after the photosensitive resin cladding is subjected to ultraviolet exposure. And forming the capillary fiber grating. The capillary fiber bragg grating has no physical damage to the fiber core, has the advantages of low insertion loss, no packaging, high stability and the like, and promotes further development of the fiber bragg grating technology.

Description

technical field [0001] The invention belongs to the technical field of optical fiber gratings, in particular to a novel capillary optical fiber grating and its preparation method by ultraviolet exposure. Background technique [0002] Fiber gratings are formed by periodic changes in the refractive index of the fiber core caused by exposure to an ultraviolet (UV) laser beam. Fiber Bragg Grating has small size, small splicing loss, corrosion resistance, and is not affected by light intensity fluctuations. It can realize multi-point distributed measurement and optical integration and other excellent characteristics, and its resonant wavelength is sensitive to external environmental variables such as temperature, stress, and humidity. Therefore, it has a great application prospect in the field of optical fiber sensing and optical communication. [0003] At present, methods for fabricating fiber gratings include lateral side interference exposure fabrication methods, phase mask m...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02138
Inventor 田凤军刘光宇姚晨宇卢艺鹏韩忠瑞李立张建中
Owner HARBIN ENG UNIV
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