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Double-clad optical fiber

A double-clad optical fiber and cladding technology, which is applied in the direction of cladding optical fiber, multi-layer core/cladding optical fiber, etc., can solve the problems of complex stacking process, etc., and achieve simple production operation, reduced coating cost, and easy process realization. Effect

Active Publication Date: 2015-04-08
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this whole stacking process is very complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 , according to the optical fiber structure design requirements listed in Table 1, the chemical vapor deposition process was used to prepare Er-doped 3+ and Al 3+ The silica-based glass core rod of the company uses a quartz tube to outsource the doped core rod, and then bores through holes in the cladding with the doped silica glass core as the symmetry.

[0032] On the other hand, two boron-doped stress rods are prepared by chemical vapor deposition, and the stress rods are processed to match the size of the bore hole. Clean the surface of the bore and stress rods and assemble them together.

[0033] Then, on the periphery of the combination rod, the capillary is stacked and jacketed with a large-pore quartz tube. After the rod-tube assembly is fixed, it is cleaned. Then put it into the drawing tower, and draw it at 1700-2100 °C. At the same time, the conventional optical fiber coating is applied and cured to protect the optical fiber.

[0034] figure ...

Embodiment 2

[0035] Example 2 , according to the optical fiber structure design requirements listed in Table 1, the porous SiO 2 layer, and then use the solution soaking doping method to prepare Tm-doped 3+ and Al 3+ The silica-based glass core rod of the company uses a quartz tube to outsource the doped core rod, and then bores through holes in the cladding with the doped silica glass core as the symmetry.

[0036] On the other hand, two boron-doped stress rods are prepared by chemical vapor deposition process, and the stress rods are processed to match the size of the above-mentioned bore hole. Clean the surface of the bore and stress rods and assemble them together.

[0037] Then, on the periphery of the combination rod, the capillary is stacked and jacketed with a large-pore quartz tube. After the rod-tube assembly is fixed, it is cleaned. Then put it into the drawing tower, and draw it at 1700-2100 °C. At the same time, the conventional optical fiber coating is applied and cure...

Embodiment 3

[0039] Example 3 , according to the optical fiber structure design requirements listed in Table 1, first use chemical vapor deposition process to prepare Ge or P doped porous SiO 2 layer, and then use the solution soaking doping method to prepare only doped Yb 3+ or Yb 3+ 、Al 3+ For the co-doped silica-based glass core rod, the doped core rod is covered by a quartz tube, and then in the cladding, the doped silica glass core is symmetrical, and through holes are respectively bored.

[0040] On the other hand, two boron-doped stress rods are prepared by chemical vapor deposition process, and the stress rods are processed to match the size of the above-mentioned bore hole. Clean the surface of the bore and stress rods and assemble them together.

[0041] Then, on the periphery of the combination rod, the capillary is stacked and jacketed with a large-pore quartz tube. After the rod-tube assembly is fixed, it is cleaned. Then put it into the drawing tower, and draw it at 17...

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Abstract

The invention relates to s double-clad optical fiber comprising a fiber core and a cladding. The optical fiber is characterized in that the fiber core is a silica-base glass core layer doped with ions, the cladding comprises an inner cladding body and an outer cladding body, the inner cladding body is a total solid silica-base glass layer composed of two doping stress areas with the low refractive index, the doping stress areas are symmetrical about the fiber core, the outer cladding body is an annular silica-base glass layer formed by air holes, the outer cladding body is provided with a supporting layer, the supporting layer is a total solid silica-base glass layer, and the outermost layer of the optical fiber is a coating layer. Special coating with the lower refractive index is needless to serve as the outer cladding body, so that coating cost is greatly reduced. The outer cladding body is silica-base glass with air holes, and is resistant to high temperature, safe, suitable for being used in a high-power optical cable laser and an optical fiber amplifier, and meanwhile suitable for optical fiber preparation in a large mode field area. The double-clad optical fiber has the advantages of being high in birefringence rate, keeping linear polarization, being large in mode filed area and the like.

Description

technical field [0001] The invention relates to a double-clad optical fiber and belongs to the technical field of optical fibers. Background technique [0002] Double-clad optical fiber refers to an optical fiber with a core, inner cladding and outer cladding structure. With the development of fiber laser technology, the application of cladding pumping technology is becoming more and more important (US5949941, 1999; US6477307 B1, 2002). This requires the use of optical fibers with a double-clad structure. [0003] Generally speaking, the inner cladding of a double-clad fiber is made of solid glass, and the outer cladding is a low-refractive-index polymer coating (US6954575 B2, 2005). For this type of double-clad fiber, the polymer coating used as the outer cladding has a low molding or softening temperature, and the operating temperature cannot be too high. When the fiber is used in high-power devices, once the fiber absorbs the laser light due to the matrix, it generates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036
Inventor 熊良明罗杰李江胡鹏成煜曹蓓蓓
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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