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Rare earth-doped multi-core optical fiber, optical fiber preform rod, preparation method and application thereof

A fiber preform, multi-core fiber technology, applied in glass manufacturing equipment, manufacturing tools, etc., can solve problems such as deterioration, fiber damage beam quality, nonlinear effects, etc., achieve large mode field area, increase transmission power, and excellent beam quality quality effect

Active Publication Date: 2021-04-27
SICHUAN LEFEI OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the advantages of high beam quality, high conversion efficiency, good heat dissipation performance and easy integration, fiber lasers have been developed rapidly in recent years, and are widely used in industrial processing, biomedical and national defense applications, and their output power has gradually increased. However, high-power laser output will bring a series of problems, such as nonlinear effects caused by excessive power density, fiber damage and beam quality degradation, and fiber is the key to fiber lasers. Components, including the active fiber as the gain medium and the passive fiber as the transmission medium, the improvement of its performance is directly related to the suppression of these malignant effects, the nonlinear effect can be greatly improved by optimizing the mode field distribution of the fiber, avoiding Damage caused by high power density and good beam quality

Method used

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  • Rare earth-doped multi-core optical fiber, optical fiber preform rod, preparation method and application thereof
  • Rare earth-doped multi-core optical fiber, optical fiber preform rod, preparation method and application thereof
  • Rare earth-doped multi-core optical fiber, optical fiber preform rod, preparation method and application thereof

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preparation example Construction

[0065] In a second aspect, an embodiment of the present invention provides a method for preparing a rare earth-doped multi-core optical fiber preform, comprising the following steps:

[0066] (1) Deposit M rare-earth-doped mandrels in a liner made of pure silica material, so that the relative refractive index difference of M-1 preformed rods is Δ2 and the diameter is d 2 , and Δ2 and d 2 The relationship that needs to be satisfied is:

[0067] The relative refractive index difference of the remaining one core layer is Δ1, and the diameter is d 1 , and Δ1 and d 1 The relationship that needs to be satisfied is:

[0068] (2) The M core rods obtained in the step (1) are matched with sleeves of pure silica material and fused into M solid rods;

[0069] (3) The solid rod obtained in step (2) is ground into a regular hexagonal rod, and its side-side distance is l, wherein, l and d 1 、d 2 The relationship that needs to be satisfied is:

[0070] (4) Prepare the sleeve pipe...

Embodiment 1

[0095] A rare earth-doped multi-core optical fiber preform, such as figure 1 As shown, it includes a preform 1 for forming the core, a preform 2 for forming the rest of the core except the intermediate core, a glass sleeve 3 for forming the cladding, and a glass filament 4 for filling the gap; , a total of 7 prefabricated rods used to form the core, each of which is composed of a Yb-doped core region and a pure silica cladding, and the core relative refractive index difference Δ1 of the preformed rods constituting the intermediate core is 0.12% , the diameter is 2.5mm, the material of the cladding is pure silica, the shape is a regular hexagon, and its side-side distance is 3.6mm; the core relative refractive index difference Δ2 of the prefabricated rods constituting the surrounding 6 cores is 0.07 %, the diameter is 3mm, the material of the cladding is pure silica, the shape is a regular hexagon, and its side-side distance is 3.6mm;

[0096]A glass sleeve used to form the cl...

Embodiment 2

[0113] A rare earth-doped multi-core optical fiber preform, such as Figure 5 As shown, it includes a preform 1 for forming the intermediate core, a preform 2 for forming the rest of the core except the intermediate core, a glass filament 3 for filling the gap, and a glass sleeve 4 for forming the cladding; A total of 19 prefabricated rods are used to form the core, each of which is composed of a Tm-doped core region and a pure silica cladding. The core relative refractive index difference Δ1 of the preformed rods constituting the intermediate core is 0.13%, The diameter is 4mm, the material of the cladding is pure silica, the shape is a regular hexagon, and its side-side distance is 6mm; the core relative refractive index difference Δ2 of the prefabricated rods constituting the surrounding 18 cores is 0.085%, and the diameter 4mm, the material of the cladding is pure silica, the shape is a regular hexagon, and its side-side distance is 6mm;

[0114] A glass sleeve used to fo...

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Abstract

The invention discloses a rare earth-doped multi-core optical fiber, an optical fiber preform rod and its preparation method and application, belonging to the field of optics and laser optoelectronics. The relative refractive index difference Δ1 of the intermediate core of the optical fiber is 0.12% to 0.17%, and the diameter D1 10-20um; the relative refractive index difference Δ2 of the remaining cores around the middle core is 0.07%-0.12%, the diameter D2 is 12-25um, the core spacing of each core is the same, and the size L is 16-30um; The inner cladding of the optical fiber is a regular octagon, and its side-side distance is 250-400um; the inner coating of the optical fiber is a low-refractive-index polymer, and its relative refractive index difference Δ3 is -5%, and the outer coating of the optical fiber is a high-refractive rate coating, its relative refractive index difference Δ4 is ​​3.5%. The optical fiber of the present invention has high absorption of pumping light and converts it into signal light of the required band, and at the same time obtains high output optical power without nonlinear effects, and has excellent beam quality, and can be used as a high-power fiber laser. Provide new avenues.

Description

technical field [0001] The invention belongs to the field of optics and laser optoelectronics, and more specifically relates to a rare earth-doped multi-core optical fiber, an optical fiber preform rod, and a preparation method and application thereof. Background technique [0002] Due to the advantages of high beam quality, high conversion efficiency, good heat dissipation performance and easy integration, fiber lasers have been developed rapidly in recent years, and are widely used in industrial processing, biomedical and national defense applications, and their output power has gradually increased. However, high-power laser output will bring a series of problems, such as nonlinear effects caused by excessive power density, fiber damage and beam quality degradation, and fiber is the key to fiber lasers. Components, including the active fiber as the gain medium and the passive fiber as the transmission medium, the improvement of its performance is directly related to the su...

Claims

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Application Information

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IPC IPC(8): C03B37/027C03B37/012C03B37/018
CPCC03B37/01211C03B37/018C03B37/027
Inventor 孟悦杨坤杨晨张心贲曹蓓蓓何亮喻建刚童维军
Owner SICHUAN LEFEI OPTOELECTRONICS TECH CO LTD
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