CN114594544A - Distributed co-doped microstructure optical fiber - Google Patents
Distributed co-doped microstructure optical fiber Download PDFInfo
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- CN114594544A CN114594544A CN202210088354.0A CN202210088354A CN114594544A CN 114594544 A CN114594544 A CN 114594544A CN 202210088354 A CN202210088354 A CN 202210088354A CN 114594544 A CN114594544 A CN 114594544A
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
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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
- G02B6/02—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
- G02B6/02361—Longitudinal structures forming multiple layers around the core, e.g. arranged in multiple rings with each ring having longitudinal elements at substantially the same radial distance from the core, having rotational symmetry about the fibre axis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a distributed co-doped microstructure optical fiber which sequentially comprises an optical fiber supporting part, an optical fiber cladding and a fiber core from outside to inside; the optical fiber cladding comprises outer cladding air holes which are arranged in a ring-shaped periodic manner and inner cladding air holes which are arranged in a polygonal lattice manner; the fiber core sequentially comprises a first rare earth ion-doped fiber core and a second rare earth ion-doped fiber core in the longitudinal direction, and the first rare earth ion-doped fiber core and the second rare earth ion-doped fiber core are respectively and independently distributed on the front section and the rear section of the optical fiber. The thulium-doped fiber core and the holmium-doped fiber core are respectively and independently distributed at the front section and the rear section of the optical fiber, the thulium ion and holmium ion distributed structure can greatly reduce the energy transfer up-conversion process, thereby reducing the loss in the cavity, improving the utilization rate of pump light, greatly simplifying the device, avoiding welding points, arranging the air holes of the inner cladding in a hexagonal lattice manner and arranging the air holes of the outer cladding in a ring-shaped periodic manner, meeting the light guide mechanism of the microstructure optical fiber and ensuring the low loss mechanism of the optical fiber.
Description
Technical Field
The invention relates to the technical field of microstructure optical fibers, in particular to a distributed co-doped microstructure optical fiber.
Background
Fiber lasers offer many advantages over conventional solid state lasers, such as being more compact and lightweight, good beam quality, large surface area to volume ratio, efficient thermal management and further power amplification. In recent years, a high-power fiber laser has revolutionized the fields of laser light source production mode and material processing, and the working waveband of a 2-micron holmium-doped fiber laser has a wide application prospect in the aspects of optical radar, free space communication, biomedical treatment, excellent pumping source serving as a mid-infrared laser and the like, and has attracted great interest. However, the problems of serious thermal load, large quantum loss, low efficiency and the like of the current holmium-doped fiber laser caused by immature fiber devices and slow pumping development of the holmium-doped fiber laser working at 2 micrometers are solved, so that how to break through the bottleneck of the current technology to further improve the output power of the holmium-doped fiber laser becomes a research difficulty in the field. The holmium-doped fiber laser usually adopts a co-band pumping technology or a thulium-holmium co-doped double-clad fiber as a gain medium. The common-band pumping technology generally needs a thulium-doped laser to pump a holmium-doped laser, has high efficiency which can reach over 90 percent, has serious thermal load during high-power operation, and has a complex device structure, which is also a main factor limiting the development and application of the holmium-doped laser; thulium-holmium co-doped fiber laser is then for fibre core thulium element and holmium element of doping simultaneously, through the energy transfer mechanism between thulium-holmium, makes holmium ion indirectly absorb pump light energy, but its performance then because of receiving the restriction efficiency of energy transfer upconversion between thulium ion and the holmium ion than with band pump fiber laser lower, slope efficiency is only 34%, output is low.
Disclosure of Invention
In view of this, in order to solve the problems of insufficient pump brightness, narrow wavelength range, complex device structure, low slope efficiency, low output power and the like of the current 2 μm holmium-doped fiber laser, the invention provides a distributed co-doped microstructure fiber, which effectively overcomes the structural defects of the existing thulium-holmium-doped photonic crystal fiber, and can realize targeted optimization of the fiber performance by changing the structural parameters of the fiber.
The invention solves the problems through the following technical means:
a distributed co-doped microstructure optical fiber sequentially comprises an optical fiber supporting part, an optical fiber cladding and a fiber core from outside to inside;
the optical fiber cladding comprises outer cladding air holes which are annularly and periodically arranged and inner cladding air holes which are arranged in a polygonal lattice manner;
the fiber core sequentially comprises a first rare earth ion-doped fiber core and a second rare earth ion-doped fiber core in the longitudinal direction, and the first rare earth ion-doped fiber core and the second rare earth ion-doped fiber core are respectively and independently distributed on the front section and the rear section of the optical fiber.
Further, the first rare earth ion-doped fiber core is a thulium-doped fiber core, and the second rare earth ion-doped fiber core is a holmium-doped fiber core.
Furthermore, the fiber core also comprises a germanium-doped fiber core and an optical fiber Bragg grating, and the fiber core sequentially comprises a thulium-doped fiber core, a germanium-doped fiber core, an optical fiber Bragg grating and a holmium-doped fiber core in the longitudinal direction.
Furthermore, the germanium-doped fiber core material is made into the fiber Bragg grating by an ultraviolet light exposure method.
Furthermore, the first rare earth ion-doped fiber core is an ytterbium-doped fiber core, a neodymium-doped fiber core, an erbium-doped fiber core or a praseodymium-doped fiber core, the second rare earth ion-doped fiber core is an ytterbium-doped fiber core, a neodymium-doped fiber core, an erbium-doped fiber core or a praseodymium-doped fiber core, and the first rare earth ion-doped fiber core and the second rare earth ion-doped fiber core are not the same rare earth ion-doped fiber core.
Further, the inner cladding air holes are arranged in a quadrilateral, a pentagonal, a hexagonal, a heptagonal, an octagonal, a nonagonal or a decagonal shape.
Furthermore, the inner cladding air holes are formed by arranging four, five, six or seven layers of air holes.
Further, the optical fiber supporting part is a quartz-based material.
Further, the core is a quartz-based material, a silicate glass, a sulfide glass, or a fluoride glass.
Compared with the prior art, the invention has the beneficial effects that at least:
Compared with the prior thulium-holmium co-doped microstructure optical fiber, the distributed co-doped microstructure optical fiber has a flexible and controllable special structure and optical performance, and reduces up-conversion loss, because the thulium-doped fiber core part and the holmium-doped part of the distributed co-doped microstructure optical fiber are distributed at the front section and the rear section of the fiber core of the same optical fiber and are independently distributed, the up-conversion loss of energy transmission of thulium ions and holmium ions is fundamentally solved, compared with the same band pumping technology, the holmium-doped optical fiber laser built by using the optical fiber can simplify the structure of the device, a space coupling system is not required to be built, an optical fiber fusion point in an all-optical fiber structure can be avoided, the thermal load of the fused laser under high power is smaller, and the laser efficiency can be greatly improved; thulium ions in the distributed co-doped microstructure optical fiber absorb pump light to generate signal light with the wavelength near 1950nm, so that holmium-doped part of the rear section of the optical fiber is pumped, the optical fiber cladding pumping can enable the whole optical fiber to generate laser with the wavelength near 2 mu m, the effect of greatly simplifying the device is achieved, high-efficiency and high-power laser output is facilitated, and the optical fiber structure provides support for holmium-doped optical fiber in the aspects of communication, biological medical treatment and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a transverse cross-sectional view of a distributed co-doped microstructured optical fiber according to the present invention;
FIG. 2 is a longitudinal cross-sectional view of a distributed co-doped microstructured optical fiber according to the present invention;
FIG. 3 is a longitudinal cross-sectional view of a distributed optical fiber with a co-doped microstructure according to the present invention;
description of reference numerals:
1. an optical fiber supporting portion; 2. outer cladding air holes; 3. inner cladding air holes; 4. a fiber core; 41. a thulium doped core; 42. a holmium-doped fiber core; 43. a germanium-doped fiber core; 44. fiber bragg gratings.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1-2, the present invention provides a distributed co-doped microstructured optical fiber comprising a fiber support portion 1, fiber cladding layers 2, 3, and a fiber core 4. The optical fiber supporting part 1 is mainly made of quartz, the optical fiber cladding is composed of outer cladding air holes 2 which are annularly and periodically arranged and inner cladding air holes 3 which are arranged in a hexagonal lattice mode, the fiber core 4 comprises a thulium-doped fiber core 41 and a holmium-doped fiber core 42 in the longitudinal direction, and the thulium-doped fiber core 41 and the holmium-doped fiber core 42 are respectively and independently distributed on the front section and the rear section of the optical fiber.
The core 4 in this embodiment includes a thulium-doped core 41 and a holmium-doped core 42, but it should be noted that the present invention is not limited to thulium-doped and holmium-doped cores, and may also be a combination of rare-earth ion-doped cores such as ytterbium-doped, neodymium-doped, erbium-doped, and praseodymium-doped cores.
The optical fiber supporting part 1 and the fiber core 4 are quartz-based materials; the outer cladding air holes 2 and the inner cladding air holes 3 are air, but the inner cladding air holes 3 are not limited to air, and can be made of materials such as germanium-doped glass, and the fiber core 4 is not limited to quartz-based materials, and can also be made of other materials such as silicate glass, sulfide glass, fluoride glass, and the like.
In this embodiment, the inner cladding air holes 3 are arranged in a hexagon, but the invention is not limited to the arrangement in the hexagon, and the arrangement mode may be a quadrangle, a pentagon, a hexagon, a heptagon, an octagon, a nonagon or a decagon.
In this embodiment, the inner cladding air holes 3 are formed by arranging five air holes, but the present invention is not limited to five air holes, and may refer to four, six, or seven layers, etc.
In order to improve the laser efficiency of the distributed co-doped microstructure optical fiber, the embodiment of fig. 2 may also add a section of germanium-doped material and a fiber grating between the thulium-doped core 41 and the holmium-doped core 42, as shown in fig. 3, that is, the core 4 includes the thulium-doped core 41, the germanium-doped core 43, the fiber bragg grating 44 and the holmium-doped core 42. The germanium-doped fiber core material 43 can be manufactured into the fiber bragg grating 44 by methods such as ultraviolet light exposure and the like, so that the transmission or reflection effect of light with specific wavelength is achieved, and the efficiency is improved.
The invention discloses a distributed co-doped microstructure optical fiber which is mainly used for generating 2 mu m high-power holmium laser. The existing thulium-holmium co-doped photonic crystal fiber has the problems of large loss, low slope efficiency, low output power and the like, and the holmium-doped fiber laser with pumping has the problems of complex structure, low efficiency of a spatial coupling system, serious heat load and the like. The fiber core of the microstructure optical fiber comprises a holmium-doped fiber core and a thulium-doped fiber core, wherein the thulium-doped fiber core and the holmium-doped fiber core are respectively and independently distributed at the front section and the rear section of the optical fiber, the energy transfer up-conversion process of the thulium ion and holmium ion can be greatly reduced due to the distributed structure of the thulium ion and the holmium ion, so that the loss in a cavity is reduced, the utilization rate of pump light is improved, the device is greatly simplified, air holes of an inner cladding are distributed in a hexagonal lattice manner, air holes of an outer cladding are distributed in a ring-shaped periodic manner, the light guide mechanism of the microstructure optical fiber is met, and the low loss mechanism of the optical fiber can be ensured.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. A distributed co-doped microstructure optical fiber is characterized by sequentially comprising an optical fiber supporting part, an optical fiber cladding and a fiber core from outside to inside;
the optical fiber cladding comprises outer cladding air holes which are annularly and periodically arranged and inner cladding air holes which are arranged in a polygonal lattice manner;
the fiber core sequentially comprises a first rare earth ion-doped fiber core and a second rare earth ion-doped fiber core in the longitudinal direction, and the first rare earth ion-doped fiber core and the second rare earth ion-doped fiber core are respectively and independently distributed on the front section and the rear section of the optical fiber.
2. The distributed co-doped microstructured optical fiber of claim 1, wherein the first rare earth ion-doped core is a thulium-doped core and the second rare earth ion-doped core is a holmium-doped core.
3. A distributed co-doped microstructured optical fiber according to claim 2, wherein the core further comprises a germanium-doped core and a fiber bragg grating, the core being sequentially thulium-doped, germanium-doped, fiber bragg grating and holmium-doped in the longitudinal direction.
4. A distributed co-doped microstructured optical fiber according to claim 3, wherein the germanium-doped core material is fabricated into a fiber bragg grating by an ultraviolet exposure method.
5. A distributed co-doped microstructured optical fiber according to claim 1, wherein the first rare-earth-ion-doped core is an ytterbium-doped core, a neodymium-doped core, an erbium-doped core or a praseodymium-doped core, the second rare-earth-ion-doped core is an ytterbium-doped core, a neodymium-doped core, an erbium-doped core or a praseodymium-doped core, and the first rare-earth-ion-doped core and the second rare-earth-ion-doped core are not the same rare-earth-ion-doped core.
6. A distributed co-doped microstructured optical fiber according to claim 1, wherein the inner cladding air holes are arranged in a quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, nonagonal or decagonal pattern.
7. A distributed co-doped microstructured optical fiber according to claim 1, wherein said inner cladding air holes are formed by four, five, six or seven air hole arrangements.
8. A distributed co-doped microstructured optical fiber according to claim 1, wherein the fiber support portion is a silica-based material.
9. The distributed, co-doped microstructured optical fiber according to claim 1, wherein the core is a silica-based material, a silicate glass, a sulfide glass, or a fluoride glass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210088354.0A CN114594544B (en) | 2022-01-25 | 2022-01-25 | Distributed co-doped microstructure optical fiber |
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| CN202210088354.0A CN114594544B (en) | 2022-01-25 | 2022-01-25 | Distributed co-doped microstructure optical fiber |
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| CN114594544A true CN114594544A (en) | 2022-06-07 |
| CN114594544B CN114594544B (en) | 2023-01-31 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040085622A1 (en) * | 2002-10-31 | 2004-05-06 | Jian Liu | Staged amplifier for lower noise figure and higher saturation power |
| CN101369035A (en) * | 2008-10-21 | 2009-02-18 | 烽火通信科技股份有限公司 | Gain photon crystal fiber guide and its device |
| US20090103874A1 (en) * | 2006-03-17 | 2009-04-23 | Crystal Fibre A/S | Optical fiber, a fiber laser, a fiber amplifier and articles comprising such elements |
| US20150155678A1 (en) * | 2008-10-23 | 2015-06-04 | Shibin Jiang | Fiber Amplifier with Multi Section Core |
| CN109412000A (en) * | 2018-12-13 | 2019-03-01 | 华南理工大学 | Super-wide band high-gain optical fiber and device technology of preparing |
| WO2021129182A1 (en) * | 2019-12-28 | 2021-07-01 | 华为技术有限公司 | Fiber amplifier |
-
2022
- 2022-01-25 CN CN202210088354.0A patent/CN114594544B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040085622A1 (en) * | 2002-10-31 | 2004-05-06 | Jian Liu | Staged amplifier for lower noise figure and higher saturation power |
| US20090103874A1 (en) * | 2006-03-17 | 2009-04-23 | Crystal Fibre A/S | Optical fiber, a fiber laser, a fiber amplifier and articles comprising such elements |
| CN101369035A (en) * | 2008-10-21 | 2009-02-18 | 烽火通信科技股份有限公司 | Gain photon crystal fiber guide and its device |
| US20150155678A1 (en) * | 2008-10-23 | 2015-06-04 | Shibin Jiang | Fiber Amplifier with Multi Section Core |
| CN109412000A (en) * | 2018-12-13 | 2019-03-01 | 华南理工大学 | Super-wide band high-gain optical fiber and device technology of preparing |
| WO2021129182A1 (en) * | 2019-12-28 | 2021-07-01 | 华为技术有限公司 | Fiber amplifier |
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