CN108333669B - Single-polarization aperiodic large-pitch single-mode active microstructure optical fiber - Google Patents
Single-polarization aperiodic large-pitch single-mode active microstructure optical fiber Download PDFInfo
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- CN108333669B CN108333669B CN201810420522.5A CN201810420522A CN108333669B CN 108333669 B CN108333669 B CN 108333669B CN 201810420522 A CN201810420522 A CN 201810420522A CN 108333669 B CN108333669 B CN 108333669B
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- optical fiber
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- air hole
- air holes
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 62
- 238000005253 cladding Methods 0.000 claims abstract description 49
- 239000000835 fiber Substances 0.000 claims abstract description 42
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052796 boron Inorganic materials 0.000 claims abstract description 21
- 239000010453 quartz Substances 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims description 4
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims description 3
- 229910052775 Thulium Inorganic materials 0.000 claims description 3
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 3
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005387 chalcogenide glass Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000005383 fluoride glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02366—Single ring of structures, e.g. "air clad"
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a single-polarization aperiodic large-pitch single-mode active microstructure optical fiber which comprises an active fiber core area, an inner cladding air hole area, a stress boron rod array area, an outer cladding air hole area and an outer cladding substrate area, wherein a plurality of air holes which are distributed along the axial direction of the optical fiber and penetrate through the whole optical fiber are arranged in the inner cladding air hole area, and boron doped quartz rods which are distributed along the axial direction of the optical fiber and penetrate through the whole optical fiber are arranged in the stress boron rod array area, so that light emitted by the active microstructure optical fiber is single-polarization light. Through the optimized design of the microstructure cladding and the stress boron rod region in the active microstructure optical fiber, under the condition that the refractive index of the section of the optical fiber changes due to laser heat, the single mode and the high-order mode can still obtain better mode separation, and single polarized light can still be kept. Under the condition of high-power operation, better beam quality and single polarization state can be ensured, and a foundation is laid for stable high-energy high-power laser operation.
Description
Technical Field
The invention relates to the field of micro-structure optical fibers, in particular to a single-polarization aperiodic large-pitch single-mode active micro-structure optical fiber.
Background
In recent years, high-power fiber lasers, particularly high-power fiber lasers with single polarization performance, which are required for coherent synthesis and the like, are increasingly used in manufacturing processes, military, and the like. In order to output higher power and reduce nonlinear effects of the optical fiber caused by high power, a method of enlarging the core area of the active optical fiber is generally adopted, when the core area is enlarged, according to a decision formula of a single mode of the optical fiber, in order to maintain the single mode output of the active optical fiber, the effective refractive index difference between the doped optical fiber core and the cladding needs to be reduced when the optical fiber is manufactured. However, the refractive index difference between the doped fiber core and the cladding quartz cannot be so small that the expansion of the core area cannot be satisfied while maintaining the single-mode output of the active fiber by the doping technique such as MCVD. With the advent of the concept of microstructured optical fibers, researchers have realized that the optical fiber can still be guaranteed to be single-mode output with a relatively large active fiber core area by the method of changing the cladding of the optical fiber into the microstructured cladding.
In the air hole arrangement mode of the active optical fiber microstructure cladding layer for ensuring that the optical fiber is in single-mode output, the air holes which are periodically arranged in a large pitch (the distance between the centers of adjacent air holes is more than 10 times of the wavelength of light) are one of the microstructure cladding air hole arrangement modes in the active microstructure optical fiber commonly used in recent years. However, the optical fiber of the single-mode output is not an absolute single-mode output, but the proportion of the high-order mode energy is much lower than that of the fundamental mode energy. Under high power, the refractive index of the section of the single-polarization active micro-structure optical fiber can be periodically distributed due to the thermal effect so as to form a grating, and the original refractive index distribution of single-mode single-polarization output of the active micro-structure optical fiber is changed. Therefore, the proportion distribution of the energy of the high-order mode and the energy of the fundamental mode can be influenced, the proportion of the energy of the fundamental mode is reduced, and the quality of the light beam is influenced.
Disclosure of Invention
The invention aims to provide a single-polarization aperiodic large-pitch single-mode active microstructure optical fiber, so that a base mode and a high-order mode of the single-polarization active microstructure optical fiber are better separated (the principle is that the aperiodic arrangement of large-pitch air holes in a cladding layer in the large-pitch active microstructure optical fiber reduces the leakage of core mode energy to a cladding layer mode through coupling, so that the better separation of the core base mode and the high-order mode of the optical fiber is realized), and the problem of mode disintegration (instability) caused by a thermally induced grating effect under high power is solved.
The technical scheme adopted by the invention is as follows: a single polarization aperiodic large pitch single mode active microstructured optical fiber, characterized in that: the optical fiber comprises an active fiber core region, an inner cladding air hole region, a stress boron rod array region, an outer cladding air hole region and an outer cladding substrate region from inside to outside, wherein a plurality of air holes which are distributed along the axial direction of the optical fiber and penetrate through the whole optical fiber are arranged in the inner cladding air hole region and the outer cladding air hole region, the plurality of air holes surround the active fiber core region by taking the fiber core axis as the center, and a plurality of boron doped quartz rods which are distributed along the axial direction of the optical fiber and penetrate through the whole optical fiber are arranged in the stress boron rod array region, so that light emitted by the active microstructure optical fiber is single polarized light.
The invention is characterized in that at least two circles of air holes surrounding the active fiber core area are arranged, the hole spacing between every two adjacent air holes is 12-30 μm, and the range of the distance ratio of the diameter of each air hole to the circle center of each adjacent air hole which is periodically arranged in the innermost layer is more than 0 and less than 43%.
The radial length of the air holes in the air hole area of the outer cladding layer is 1-30 mu m.
The active fiber core area is any one of ytterbium doped, erbium doped, thulium doped or neodymium doped.
The outer cladding substrate area is any one of quartz, soft glass or plastic.
The stress boron rod array areas are symmetrically arranged on two sides of the active fiber core area.
The beneficial effects of the invention are as follows: through the optimized design of the microstructure cladding and the stress boron rod region in the active microstructure optical fiber, under the condition that the refractive index of the section of the optical fiber changes due to laser heat, the single mode and the high-order mode can still obtain better mode separation, and single polarized light can still be kept. Under the condition of high-power operation, the optical fiber can still ensure better light beam quality and single polarization state, and lays a foundation for stable high-energy high-power laser operation.
Drawings
FIG. 1 is a schematic cross-sectional view of an optical fiber according to embodiment 1 of the present invention;
FIG. 2 is a schematic cross-sectional view of an optical fiber according to embodiment 2 of the present invention;
fig. 3 is a schematic view of a cross-sectional structure of an optical fiber according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the utility model provides a single polarization aperiodic large-pitch single mode active microstructure fiber is from inside to outside in proper order including active fiber core region 1, inner cladding air hole region 2, stress boron rod array region 3, outer cladding air hole region 4 and outer cladding substrate region 5, set up a plurality of air holes that distribute along the optic fibre axial and run through whole optic fibre in inner cladding air hole region 2 and the outer cladding air hole region 4, a plurality of air holes surround around active fiber core region 1 with the fiber core axle center as the center, set up a plurality of boron doped quartz rods that distribute along the optic fibre axial and run through whole optic fibre in the stress boron rod array region 3, make the light that active microstructure fiber was emergent be single polarization.
At least two circles of air holes are arranged around the active fiber core region 1, the hole spacing between every two adjacent air holes is 12-30 mu m, and the distance ratio of the diameter of each air hole to the circle center of each adjacent air hole which is periodically arranged in the innermost layer is more than 0 and less than 43%.
In the outer cladding air hole region 4, the area occupied by a plurality of air holes accounts for more than 80% of the outer cladding air hole region 4, and the radial length of the air holes in the outer cladding air hole region 4 is between 1 and 30 mu m.
The active core region 1 is any one of ytterbium doped, erbium doped, thulium doped or neodymium doped. The outer cladding substrate region 5 is any one of quartz, soft glass (chalcogenide glass, ungulate glass, fluoride glass) or plastic. The stress boron rod array regions 3 are symmetrically arranged at two sides of the active fiber core region 1.
Example 1:
as shown in fig. 1, the active fiber core region 1 is made of active doped quartz material, the outer cladding substrate region 5 is made of quartz material, the inner cladding air hole region 2 is two circles of air holes, and the first circle of air holes are six air holes with equal intervals around the active fiber core region 1; the distance between the circle centers of the adjacent air holes in the first circle is 21 mu m, and the diameter of each air hole is 2 mu m; the outside of the five equidistant air holes, namely, the two sides of the active fiber core area 1 are respectively provided with ten boron doped quartz rods symmetrically distributed in the active fiber core area; the second turn of air holes is eight air holes surrounding the active core region 1, which form neither rotational symmetry nor specular symmetry, thus forming an aperiodic air hole distribution. The outer cladding air hole region 4 is a circle of air holes with the radial length of 5 μm.
Example 2:
as shown in fig. 2, the active core region 1 is made of an active doped quartz material, the outer cladding substrate region 5 is made of a quartz material, the inner cladding air hole region 2 is two circles of air holes, and the first circle of air holes are six air holes which surround the active core region 1 at equal intervals; ten boron doped quartz rods are respectively arranged outside the first circle of six equidistant air holes, namely at two sides of the active fiber core area 1; the second circle of air holes are eight equally spaced air holes surrounding the active fiber core area 1, the distance between the centers of the first circle of adjacent air holes and the second circle of adjacent air holes is 15 mu m, the diameter of each air hole is 4 mu m, two air holes close to the second circle of air holes (the size of each air hole is the same as that of the first circle of air holes and the second circle of air holes, and the nearest distance between the three air holes and the second circle of air holes is 8 mu m) are additionally arranged outside the second circle of air holes, so that aperiodic air hole distribution is formed in the inner cladding of the optical fiber. The outer cladding air hole region 4 is a ring of air holes having a radial length of 13 μm.
Example 3:
as shown in fig. 3, the active core region 1 is made of an active doped quartz material, and the outer cladding base region 5 is made of a quartz material. The inner cladding air hole area 2 is two circles of air holes, and the first circle of air holes are six equally-spaced air holes surrounding the active fiber core area 1; ten boron doped quartz rods are respectively arranged outside the first circle of six equidistant air holes, namely at two sides of the active fiber core area 1; the second circle of air holes are eight equally spaced air holes surrounding the active fiber core area 1, the distance between the centers of the first circle of adjacent air holes and the second circle of adjacent air holes is 20 mu m, the diameter of each air hole is 8 mu m, two air holes close to the second circle of air holes (the size of each air hole is the same as that of the first circle of air holes and the second circle of air holes, and the nearest distance between the three air holes and the second circle of air holes is 6 mu m) are additionally arranged outside the second circle of air holes, so that aperiodic air hole distribution is formed in the inner cladding of the optical fiber. The outer cladding air hole region 4 is a ring of air holes having a radial length of 26 μm.
In a specific embodiment, the smaller the ratio of the diameter of the first circle of air holes to the distance between the centers of the first circle of periodically adjacent air holes, the better the beam quality of the optical fiber, but the higher the preparation difficulty. The smaller the radial width of a circle of air holes in the air hole area of the outer cladding layer of the optical fiber is, the better the heat dissipation effect of the optical fiber is, but the higher the preparation difficulty is.
The structure utilizes the aperiodic air hole distribution to better separate the single mode from the high-order modes, and the single mode and the high-order modes can still be better mode separated under the condition that the refractive index of the section of the optical fiber is changed due to laser heat. Under the condition of high-power operation, the aperiodic large-pitch active microstructure optical fiber can still ensure better beam quality, still keep single polarized light and lay a foundation for stable high-energy high-power laser operation.
The parameters (the difference between the base film overlap factor and the overlap factor of the best-constrained high-order modes) of such fibers with optimally designed non-periodic large-pitch air hole arrangements can be more than 60%.
The preparation of the microstructure optical fiber adopts a common stacking-drawing method for preparing the microstructure optical fiber: the drawn capillary, quartz wire, active doped core rod and passive doped boron rod are piled up into an optical fiber preform, and then drawn into an optical fiber.
Claims (4)
1. A single polarization aperiodic large pitch single mode active microstructured optical fiber, characterized in that: the optical fiber comprises an active fiber core region (1), an inner cladding air hole region (2), a stress boron rod array region (3), an outer cladding air hole region (4) and an outer cladding substrate region (5) from inside to outside, wherein a plurality of air holes which are distributed along the axial direction of the optical fiber and penetrate through the whole optical fiber are arranged in the inner cladding air hole region (2) and the outer cladding air hole region (4), the plurality of air holes surround the active fiber core region (1) by taking the fiber core axis as the center, the stress boron rod array region (3) is symmetrically arranged at two sides of the active fiber core region (1), and a plurality of boron doped quartz rods which are distributed along the axial direction of the optical fiber and penetrate through the whole optical fiber are respectively arranged in the stress boron rod array region (3) at two sides, so that light emitted by the active microstructure optical fiber is single polarized light;
the air holes surrounding the active fiber core area (1) are at least provided with two circles, the hole spacing between every two adjacent air holes is 12-30 mu m, and the range of the distance ratio of the diameter of each air hole to the circle center of each adjacent air hole which is periodically arranged in the innermost layer is more than 0 and less than 43%.
2. A single polarization aperiodic large pitch single mode active micro structured fiber according to claim 1, characterized in that: the radial length of the air holes in the outer cladding air hole region (4) is between 1 and 30 mu m.
3. A single polarization aperiodic large pitch single mode active micro structured fiber according to claim 1, characterized in that: the active fiber core area (1) is any one of ytterbium doped, erbium doped, thulium doped or neodymium doped.
4. A single polarization aperiodic large pitch single mode active micro structured fiber according to claim 1, characterized in that: the outer cladding substrate region (5) is any one of quartz, soft glass or plastic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810420522.5A CN108333669B (en) | 2018-05-04 | 2018-05-04 | Single-polarization aperiodic large-pitch single-mode active microstructure optical fiber |
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| CN201810420522.5A CN108333669B (en) | 2018-05-04 | 2018-05-04 | Single-polarization aperiodic large-pitch single-mode active microstructure optical fiber |
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| CN108333669B true CN108333669B (en) | 2024-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113589424B (en) * | 2021-07-07 | 2022-05-17 | 燕山大学 | Polarization-maintaining dispersion compensation microstructure optical fiber |
| CN115248475B (en) * | 2022-08-04 | 2024-08-09 | 艾菲博(宁波)光电科技有限责任公司 | Microstructure polarization maintaining fiber |
| CN115615921A (en) * | 2022-10-13 | 2023-01-17 | 哈尔滨工程大学 | Compact all-fiber speckle spectrometer based on microstructure multimode fiber |
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| CN102213792A (en) * | 2011-06-09 | 2011-10-12 | 华中科技大学 | Large-mode-area active optical fiber and preparation method thereof |
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| CN106199827A (en) * | 2016-07-27 | 2016-12-07 | 武汉长盈通光电技术有限公司 | A kind of oval core panda type polarization-preserving fiber and preparation method thereof |
| CN208156230U (en) * | 2018-05-04 | 2018-11-27 | 中国电子科技集团公司第四十六研究所 | Single polarization active microstructured optical fibers of aperiodicity coarse pitch single mode |
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2018
- 2018-05-04 CN CN201810420522.5A patent/CN108333669B/en active Active
Patent Citations (8)
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|---|---|---|---|---|
| CN1687809A (en) * | 2005-04-29 | 2005-10-26 | 中国科学院上海光学精密机械研究所 | Active large-core-diameter single-mode double-cladding photonic crystal fiber |
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