Hard cladding rare-earth-doped optical fiber and preparation method thereof

A rare earth-doped, cladding technology, applied in cladding optical fibers, multi-layer core/cladding optical fibers, graded index core/cladding optical fibers, etc. The effect of drawing yield, avoiding air bubbles, and reducing manufacturing difficulty

Pending Publication Date: 2021-05-07
FENGHUO COMM SCI & TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides a hard-clad rare earth-doped optical fiber and its preparation method to solve the problem of difficulty in manufacturing fluorine-doped tubes in the related art

Method used

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  • Hard cladding rare-earth-doped optical fiber and preparation method thereof
  • Hard cladding rare-earth-doped optical fiber and preparation method thereof
  • Hard cladding rare-earth-doped optical fiber and preparation method thereof

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preparation example Construction

[0048] to combine figure 1 with figure 2 As shown, the embodiment of the present application provides a method for preparing the above-mentioned hard-clad rare earth-doped optical fiber, the preparation method includes the following steps:

[0049] 101: Prepare an octagonal rare-earth-doped mandrel. The octagonal rare-earth-doped mandrel includes a core layer 1 and a quartz cladding 2 located outside the core layer 1. The outside of the cross-section of the quartz cladding 2 is octagonal; preferably, eight The numerical aperture NA range of the polygonal rare earth-doped mandrel is between 0.04 and 0.20;

[0050] 102: Prepare a fluorine-doped sleeve, which includes a fluorine-doped cladding 3 and a quartz substrate located outside the fluorine-doped cladding 3; it should be noted that step 101 and step 102 can be performed at the same time or first A fluorine-doped casing is prepared, and an octagonal rare-earth-doped mandrel is prepared.

[0051] 103: Insert the octagonal...

Embodiment 1

[0067] Example 1: 100 / 400 / 480 hard cladding ytterbium-doped fiber

[0068] Such as figure 1 As shown, the 100 / 400 / 480 hard cladding ytterbium-doped fiber includes a core layer 1, a quartz cladding 2, a fluorine-doped cladding 3, a low refractive index coating 4, and a high temperature resistant Outer coating5.

[0069] The manufacturing method of the hard cladding ytterbium-doped optical fiber is as follows:

[0070] (1) The ytterbium-doped mandrel was prepared by MCVD vapor phase doping process. The core diameter of the ytterbium-doped mandrel is 3mm, and the outer diameter of the ytterbium-doped mandrel is 16mm. The ytterbium Yb ion doping concentration in the ytterbium-doped mandrel is 0.25mol%, the aluminum Al ion doping concentration is 2.5mol%, and the phosphorus P ion doping concentration is 2.0mol%. The numerical aperture NA of the ytterbium-doped mandrel is 0.11.

[0071] (2) Grinding the ytterbium-doped mandrel in an octagonal shape according to the target core-...

Embodiment 2 00

[0079] Embodiment 2 300 / 400 / 480 hard cladding ytterbium-doped optical fiber

[0080] Such as figure 1 As shown, the 300 / 400 / 480 hard cladding ytterbium-doped fiber includes a core layer 1, a quartz cladding 2, a fluorine-doped cladding 3, a low refractive index coating 4, and a high temperature resistant Outer coating5.

[0081] The manufacturing method of the hard cladding ytterbium-doped optical fiber is as follows:

[0082] (1) The ytterbium-doped mandrel was prepared by MCVD vapor phase doping process. The core diameter of the ytterbium-doped mandrel is 8mm, and the outer diameter of the ytterbium-doped mandrel is 21mm. The Yb ion doping concentration in the ytterbium-doped mandrel is 0.3 mol%, the Al ion doping concentration is 3.0 mol%, and the P doping concentration is 2.8 mol%. The numerical aperture NA of the ytterbium-doped mandrel is 0.10.

[0083] (2) The octagonal grinding of the ytterbium-doped mandrel was carried out according to the target core-to-wrap rat...

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Abstract

The invention relates to a hard cladding rare-earth-doped optical fiber and a preparation method thereof. The hard cladding rare-earth-doped optical fiber comprises a core layer, a quartz cladding and a fluorine-doped cladding which are arranged from inside to outside in the radial direction, wherein the core layer is doped with rare earth ions; and the refractive index of the fluorine-doped cladding is gradually increased from inside to outside in the radial direction. The part playing a light limiting role in the fluorine-doped quartz layer of the hard cladding optical fiber is mainly the part closest to the quartz cladding, so that in the embodiment, the fluorine-doped quartz layer is optimized, that is, the fluorine-doped cladding is designed into a form that the refractive index of the fluorine-doped cladding is gradually increased from inside to outside in the radial direction, and during manufacturing, high-concentration doping is carried out on the innermost side to ensure that the fluorine doping concentration meets the requirement, so that the light limiting requirement of the optical fiber can be met, and meanwhile, the fluorine doping amount is gradually reduced towards the outer side instead of carrying out high-concentration doping on the whole fluorine-doped cladding, so that the manufacturing difficulty of the fluorine-doped tube can be reduced.

Description

technical field [0001] The present application relates to the technical field of optical fiber manufacturing, in particular to a hard cladding rare earth-doped optical fiber and a preparation method thereof. Background technique [0002] Rare earth doped fiber is an important class of active fiber. Rare earth-doped fiber refers to the doping of trace rare earth elements (such as ytterbium, erbium, etc.) Rare earth doped fibers can be used to manufacture fiber amplifiers and fiber lasers. [0003] Taking ytterbium-doped fiber as an example, as the gain medium of the laser, the ytterbium-doped fiber can convert the pump light into laser, and realize the laser output of the laser. Compared with solid-state lasers and gas lasers, fiber lasers are the laser form with the best beam quality. Fiber lasers essentially convert low-quality pump lasers into higher-quality laser outputs. Due to the continuous expansion of application fields, for fiber optics The demand for laser outpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/028G02B6/036H01S3/067C03B37/027C03B37/018C03B37/012
CPCG02B6/02G02B6/0283G02B6/03622G02B6/02395H01S3/06716C03B37/027C03B37/018C03B37/01861C03B37/01228C03B37/01211C03B2203/32C03B2203/12
Inventor 朱侨罗文勇杜城柯一礼田俊彭争平王龙
Owner FENGHUO COMM SCI & TECH CO LTD
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