CN111562651A - High-power optical fiber combiner - Google Patents
High-power optical fiber combiner Download PDFInfo
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- CN111562651A CN111562651A CN202010320888.2A CN202010320888A CN111562651A CN 111562651 A CN111562651 A CN 111562651A CN 202010320888 A CN202010320888 A CN 202010320888A CN 111562651 A CN111562651 A CN 111562651A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The invention relates to a high-power optical fiber combiner, which comprises a cone area (3) formed by bundling, melting, tapering and cutting N input optical fibers (1), wherein the cone area (3) is welded with one output optical fiber (2), a low-refractive-index glue area (5) is formed on the surface of the cone area (3), and a first high-refractive-index glue area (4) and a second high-refractive-index glue area (6) are respectively formed in the upstream and downstream areas of the cone area (3). The high-refractive-index glue areas (4) and (6) can play a role in respectively filtering cladding transmission light in the input optical fiber (1) and the output optical fiber (2), and the quality of light beams is improved. The low-refractive-index glue area (5) enables the cladding transmission light in the cone area (3) to still meet the law of total reflection at the interface of the cladding and the low-refractive-index glue area, and the optical power loss is reduced. In addition, the cone area and the welding position can be well protected through the three glue areas, and the mechanical protection effect on the device is achieved.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a high-power optical fiber beam combiner.
Background
The fiber laser has the advantages of good beam quality, compact structure, small volume, light weight, easy heat dissipation, good working stability and the like, and is widely applied to the fields of industry, medical treatment, national defense and the like. The optical fiber combiner is an important device of the optical fiber laser, and can be divided into a pumping combiner and a power combiner according to functions. The power of a single pump source is limited, and the pump beam combiner is used for injecting multiple pump sources into one optical fiber at the same time, so that the sufficient pump power can be increased. The power beam combiner is used for simultaneously injecting multiple paths of single-mode laser with medium power into one multimode optical fiber so as to obtain high-power laser output.
The main manufacturing process of the optical fiber combiner comprises input optical fiber group bundle, group bundle optical fiber fusion tapering, cutting of fused tapered optical fiber bundle, fusion welding with output optical fiber, packaging and the like. The molten region of the fiber is stripped and tapered, which is necessarily protected. Meanwhile, the light path of the area is complex, which easily causes the reduction of the light beam quality and the loss of the light power. The existing process only simply carries out cementing mechanical protection on the area, and certain reduction of the optical performance of the device is caused.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a high-power optical fiber combiner aiming at the above prior art, which can protect the taper region mechanically and prevent the optical performance from decreasing.
The technical scheme adopted by the invention for solving the problems is as follows: a high-power optical fiber combiner comprises a cone area formed by bundling, melting, tapering and cutting N input optical fibers, wherein the cone area is welded with one output optical fiber, a low-refractive-index glue area is formed on the surface of the cone area, and a first high-refractive-index glue area and a second high-refractive-index glue area are respectively formed in the upstream area and the downstream area of the cone area.
Preferably, the parameters of the input and output optical fibers satisfy the conservation of brightness criterion:
wherein Din、NAinRespectively the core diameter and the numerical aperture of the input fiber, Dout、NAoutRespectively the core diameter and the numerical aperture of the output fiber.
Preferably, the length L of the tapered zone satisfies the adiabatic tapering criterion.
Preferably, the first high refractive index glue region and the second high refractive index glue region are made of the same glue, and the refractive index n of the glue region is larger than that of the glue regionHNot less than 1.55; the low refractive index glue area adopts the refractive index n of glueL≤1.42。
Preferably, the low refractive index glue area is beyond the taper area, and the first high refractive index glue area and the second high refractive index glue area respectively cover the areas near the critical parts of the input optical fiber and the output optical fiber where the coating layers are stripped.
Compared with the prior art, the invention has the advantages that:
according to the invention, the high-refractive-index glue area with the refractive index larger than that of the cladding is arranged in the area near the critical position of the N input optical fibers for stripping the coating, so that the cladding transmission light does not meet the law of total reflection at the interface of the cladding and the high-refractive-index glue area, the cladding transmission light enters the coating stripping area and is filtered from the high-refractive-index glue area, the fiber core transmission light is not influenced, and the beam quality can be improved; after the fiber core transmission light of the N input optical fibers enters the cone area, the fiber core transmission optical fibers are transferred to the cladding due to the fact that the size of the optical fibers is reduced, the cone area is not provided with a coating layer, and the low-refractive-index glue area with the refractive index smaller than that of the cladding is arranged, so that the cladding transmission light can still meet the law of total reflection at the interface of the cladding and the low-refractive-index glue area, and the loss of optical power is reduced; after the light of cone region gets into output fiber, there will be a small part of optic fibre to transmit in the covering, set up the high refractive index that the refracting index is greater than the covering refracting index again and glue the district to make covering transmission light satisfy the law of total reflection at the covering-high refractive index glue district interface, thereby the covering transmission light can follow the filtering of high refractive index glue district equally, and the fibre core transmission light is not influenced, so can promote the light beam quality of output light. In addition, the cone area and the welding position can be well protected through the three glue areas, and the mechanical protection effect on the device is achieved.
Drawings
Fig. 1 is a schematic diagram of a cementing method of an optical fiber combiner according to the present invention.
Fig. 2 is a diagram illustrating an energy distribution of output light of a branch of an optical fiber combiner according to the present invention.
Wherein:
the optical fiber comprises an input optical fiber 1, an output optical fiber 2, a cone area 3, a first high-refractive-index glue area 4, a low-refractive-index glue area 5 and a second high-refractive-index glue area 6.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The high-power optical fiber combiner provided by the embodiment comprises an input optical fiber 1 and an output optical fiber 2, wherein the parameters of the input optical fiber 1 and the output optical fiber 2 meet the brightness conservation criterion:
wherein Din、NAinRespectively the diameter and the numerical aperture, D, of the input optical fiber 1out、NAoutRespectively the diameter and numerical aperture of the output fiber 2. N input fiber 1 forms cone 3 after restrainting, melting, tapering, cutting, and the length L of cone 3 satisfies adiabatic tapering criterion, cone 3 and the butt fusion of output fiber 2 the coating has low refracting index to glue district 5 on cone 3, has first high refracting index to glue district 4 and the gluey district 6 of second high refracting index in the regional coating respectively of the upper and lower stream of cone.
Example (b):
referring to fig. 1, the power combiner is a (7+1) × 1 power combiner, parameters of 7 input optical fibers 1 are that the diameter of a core/package is 20/130 mu M, the NA is 0.08, parameters of an output optical fiber 2 are that the diameter of the core/package is 100/120 mu M, the NA is 0.22, the same glue is used for high-refractive- index glue areas 4 and 6, the refractive index is 1.565, the refractive index of the glue used for low-refractive-index glue area 5 is 1.41, the power combiner manufactured by the glue binding method of the invention is used for injecting light with the wavelength of 1080nm, the power of 500W and the beam quality M into 7 input optical fibers of the power combiner respectively21.2 signal laser, the branch signal efficiency of the power beam combiner is 96.4% -97.2%, and the beam quality M of the branch output light2Has an average value of 6.85. Fig. 2 is an energy distribution diagram of output light of one of the branches, and it can be seen that the output light is close to gaussian distribution.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a high-power optical fiber beam combiner, includes by N input fiber (1) through the cone (3) that form after group bundle, melting, tapering, cutting, cone (3) and an output fiber (2) butt fusion, its characterized in that: the surface of the cone area (3) is provided with a low-refractive-index rubber area (5), and a first high-refractive-index rubber area (4) and a second high-refractive-index rubber area (6) are respectively formed in the upstream and downstream areas of the cone area (3).
2. The high power optical fiber combiner as claimed in claim 1, wherein: the parameters of the input optical fiber (1) and the output optical fiber (2) meet the brightness conservation criterion:
wherein Din、NAinRespectively the core diameter and the numerical aperture, D, of the input fiber (1)out、NAoutThe core diameter and the numerical aperture of the output optical fiber (2) are respectively.
3. The high power optical fiber combiner as claimed in claim 1, wherein: the length L of the conical zone (3) meets the adiabatic tapering criterion.
4. The high power optical fiber combiner as claimed in claim 1, wherein: the first high-refractive-index glue area (4) and the second high-refractive-index glue area (6) adopt the same glue, and the refractive index n of the glue is nHNot less than 1.55; the low-refractive-index glue area (5) adopts the refractive index n of glueL≤1.42。
5. The high power optical fiber combiner as claimed in claim 1, wherein: the range of the low-refractive-index glue area (5) exceeds the range of the cone area (3), and the first high-refractive-index glue area (4) and the second high-refractive-index glue area (6) respectively cover the areas near the critical positions of the input optical fiber (1) and the output optical fiber (2) where coating layers are stripped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010320888.2A CN111562651A (en) | 2020-04-22 | 2020-04-22 | High-power optical fiber combiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010320888.2A CN111562651A (en) | 2020-04-22 | 2020-04-22 | High-power optical fiber combiner |
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| Publication Number | Publication Date |
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| CN111562651A true CN111562651A (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010320888.2A Pending CN111562651A (en) | 2020-04-22 | 2020-04-22 | High-power optical fiber combiner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112346175A (en) * | 2021-01-06 | 2021-02-09 | 季华实验室 | 3dB light wave power beam splitter |
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2020
- 2020-04-22 CN CN202010320888.2A patent/CN111562651A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112346175A (en) * | 2021-01-06 | 2021-02-09 | 季华实验室 | 3dB light wave power beam splitter |
| CN112346175B (en) * | 2021-01-06 | 2021-04-06 | 季华实验室 | 3dB light wave power beam splitter |
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Effective date of registration: 20211119 Address after: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Applicant before: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Applicant before: WUXI FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Applicant before: FASTEN GROUP Co.,Ltd. |
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