CN114624812A - Multi-core energy transmission optical fiber and preparation method thereof - Google Patents
Multi-core energy transmission optical fiber and preparation method thereof Download PDFInfo
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- CN114624812A CN114624812A CN202210258126.3A CN202210258126A CN114624812A CN 114624812 A CN114624812 A CN 114624812A CN 202210258126 A CN202210258126 A CN 202210258126A CN 114624812 A CN114624812 A CN 114624812A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 49
- 230000005540 biological transmission Effects 0.000 title abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 91
- 238000005253 cladding Methods 0.000 claims abstract description 87
- 239000011247 coating layer Substances 0.000 claims abstract description 57
- 239000000835 fiber Substances 0.000 claims abstract description 52
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000005491 wire drawing Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 25
- 230000010354 integration Effects 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004080 punching Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 239000003550 marker Substances 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 238000010146 3D printing Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 238000004372 laser cladding Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G02B6/02042—Multicore optical fibres
-
- 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
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02338—Structured core, e.g. core contains more than one material, non-constant refractive index distribution in core, asymmetric or non-circular elements in core unit, multiple cores, insertions between core and 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
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention belongs to the technical field of high-power fiber laser, and discloses a multi-core energy-transmitting fiber and a preparation method thereof. The multi-core energy-transmitting optical fiber comprises an inner cladding, a fiber core and a coating layer, wherein the inner cladding is provided with at least two core holes along the axial direction; the fiber cores are correspondingly arranged in the core holes in a penetrating mode, each fiber core comprises an inner core, a fluorine-doped layer and a buffer layer, the fluorine-doped layers are sleeved on the peripheries of the inner cores, and the buffer layers are sleeved on the peripheries of the fluorine-doped layers; the coating layer comprises a first coating layer and a second coating layer, the periphery of the inner cladding layer is sleeved with the first coating layer, and the outer side of the first coating layer is sleeved with the second coating layer. According to the multi-core energy transmission optical fiber provided by the invention, at least two fiber cores can be integrated into one fiber by the inner cladding, so that a single optical fiber can transmit multiple beams of laser, and the integration level of laser welding equipment is further improved; by arranging the fluorine-doped layer, the fluorine-doped layer can negatively construct the refractive index of the fiber core, so that the leakage of transmission laser in the fiber core is prevented; through setting up the buffer layer, the buffer layer can effectively improve the bending resistance of inner core, plays the stress cushioning effect.
Description
Technical Field
The invention relates to the technical field of high-power fiber lasers, in particular to a multi-core energy-transmitting fiber and a preparation method thereof.
Background
In modern industrial manufacturing, the organic combination of laser technology and welding technology forms a new type of laser welding technology. The novel laser welding technology is applied to various fields, and the market scale of the novel laser welding technology is second to laser cutting in the whole laser industry chain, so that the novel laser welding technology is applied to the second large-scale laser. The laser welding plays a great role in the fields of automobile manufacturing, new energy, industrial processing and the like. The laser welding technology adopts a laser light source to replace the traditional welding material, uses laser energy to heat the surface of the welding part, and realizes high-efficiency precise welding through laser heat radiation and material surface heat conduction.
The double-beam and multi-beam laser high-power welding technology can effectively improve the adaptability of laser welding to the assembly progress, improve the stability of the laser welding process technology and improve the overall quality of the welding process. For materials and joints which are difficult to weld by conventional single-beam laser welding, ideal process application effects can be achieved by adopting a double-beam and multi-beam welding process.
Laser welding and 3D printing equipment are generally provided with a laser beam or a laser independently provided with a laser processing head at present. The laser welding processing head is large in size, energy transmission optical fibers used in QBH devices of the optical fiber laser are single-core transmission lasers, and one optical fiber can only transmit one laser beam. Therefore, in the actual multi-beam welding process, one set of equipment needs to be provided with a plurality of laser welding heads, and the system integration level of the multi-beam laser welding equipment is greatly reduced.
Disclosure of Invention
The invention aims to provide a multi-core energy transmission optical fiber and a preparation method thereof, aiming at improving the system integration level of multi-beam laser welding equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-core energy transmitting optical fiber comprising:
the inner cladding is provided with at least two core holes along the axial direction;
the fiber cores penetrate through the core holes in a one-to-one correspondence mode, each fiber core comprises an inner core, a fluorine-doped layer and a buffer layer, the fluorine-doped layer is sleeved on the periphery of the inner core, and the buffer layer is sleeved on the periphery of the fluorine-doped layer;
the coating layer comprises a first coating layer and a second coating layer, the first coating layer is sleeved on the periphery of the inner cladding layer, and the second coating layer is sleeved on the outer side of the first coating layer.
Optionally, the first coating layer and the second coating layer are both made of a polymer.
Optionally, a radial distance between an outer wall of the buffer layer and an outer wall of the inner cladding along the inner cladding is not less than 8 μm.
Optionally, the material of the inner core and/or the inner cladding is high-purity silicon dioxide.
Optionally, the inner core has a diameter of 9 μm to 100 μm.
Optionally, the inner cladding has a diameter of 125 μm to 2000 μm.
Optionally, the inner cladding is further provided with a marking hole along the axial direction, and a marking core is arranged in the marking hole in a penetrating manner.
A preparation method of a multi-core energy transmission optical fiber is based on any scheme, and comprises the following steps:
s1, designing the sizes of the inner cladding and the fiber core;
s2, preparing the inner cladding, and processing the core hole on the inner cladding;
s3, preparing the fiber core, and penetrating the fiber core into the core hole;
and S4, forming the coating layer on the periphery of the inner cladding.
Optionally, step S3 includes:
s31: preparing the inner core;
s32: carrying out fluorine doping treatment on the inner core to form the fluorine-doped layer;
s33: depositing the buffer layer on the outer side of the fluorine-doped layer to obtain the fiber core;
s34: and penetrating the fiber core into the core hole.
Optionally, step S4 includes:
s41: performing fusion and extension treatment on the inner cladding;
s42: and carrying out precision wire drawing treatment on the inner cladding, and preparing the coating layer on the periphery of the inner cladding.
The invention has the beneficial effects that:
according to the multi-core energy-transfer optical fiber provided by the invention, the inner cladding is arranged, the inner cladding is provided with at least two core holes along the axial direction, the fiber cores are correspondingly arranged in the core holes in a penetrating manner, and the inner cladding can integrate the at least two fiber cores into one bundle, so that one bundle of optical fiber can transmit multiple laser beams, and the integration level of laser welding equipment is further improved; by arranging the fluorine-doped layer, the fluorine-doped layer is sleeved on the periphery of the inner core and can negatively construct the refractive index of the fiber core, so that the leakage of transmission laser in the fiber core is prevented; by arranging the buffer layer, the buffer layer is sleeved on the periphery of the fluorine-doped layer, the buffer layer can effectively prevent laser leakage, improve the bending resistance of the inner core and play a role in buffering stress; through setting up the coat, the coat includes first coat and second coat, and the periphery of inner cladding is located to first coat cover, and the outside on first coat is located to second coat cover, can protect the fibre core, has improved the reliability that this multicore passes can optic fibre.
The preparation method of the multi-core energy-transmitting optical fiber provided by the invention can improve the number of light beams transmitted by a single optical fiber, improve the processing precision of laser 3D printing and cladding and improve the manufacturing efficiency.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of a multi-core energy-transmitting optical fiber according to the present invention;
FIG. 2 is a schematic cross-sectional view of another embodiment of a multi-core energy-transmitting optical fiber according to the present invention;
FIG. 3 is a flow chart of a method for manufacturing a multi-core energy-transmitting optical fiber according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for manufacturing a multi-core energy-transmitting optical fiber with a marking core according to an embodiment of the present invention.
In the figure:
1. an inner cladding; 2. a fiber core; 21. an inner core; 22. a fluorine-doped layer; 23. a buffer layer; 3. a coating layer; 31. a first coating layer; 32. a second coating layer; 4. the core is marked.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1 and 2, the present embodiment provides a multi-core energy-transmitting optical fiber. The multi-core energy-transmitting optical fiber comprises an inner cladding layer 1, a fiber core 2 and a coating layer 3, wherein the inner cladding layer 1 is provided with at least two core holes along the axial direction; the fiber cores 2 penetrate through the core holes in a one-to-one correspondence mode, each fiber core 2 comprises an inner core 21, a fluorine-doped layer 22 and a buffer layer 23, the fluorine-doped layer 22 is sleeved on the periphery of the inner core 21, and the buffer layer 23 is sleeved on the periphery of the fluorine-doped layer 22; the coating layer 3 includes a first coating layer 31 and a second coating layer 32, the first coating layer 31 is sleeved on the periphery of the inner cladding layer 1, and the second coating layer 32 is sleeved on the outer side of the first coating layer 31.
According to the multi-core energy-transfer optical fiber provided by the invention, the inner cladding layer 1 is arranged, the inner cladding layer 1 is provided with at least two core holes along the axial direction, the fiber cores 2 penetrate through the core holes one by one, the inner cladding layer 1 can integrate the at least two fiber cores 2 into one bundle, so that one bundle of optical fiber can transmit a plurality of laser beams, and the integration level of laser welding equipment is further improved; by arranging the fluorine-doped layer 22, the fluorine-doped layer 22 is sleeved on the periphery of the inner core 21, the fluorine-doped layer 22 can negatively construct the refractive index of the fiber core 2, and the leakage of transmission laser in the fiber core 2 is prevented; by arranging the buffer layer 23, the buffer layer 23 is sleeved on the periphery of the fluorine-doped layer 22, the buffer layer 23 can effectively prevent laser leakage, improve the bending resistance of the inner core 21 and play a role in stress buffering; through setting up coating 3, coating 3 includes first coating 31 and second coating 32, and the periphery of inner cladding 1 is located to first coating 31 cover, and the outside of first coating 31 is located to second coating 32 cover, can protect fibre core 2, has improved the reliability that this multicore can pass ability optic fibre.
Further, the radial distance between the outer wall of the buffer layer 23 and the outer wall of the inner cladding 1 along the inner cladding 1 is not less than 8 μm. Generally, when high-power laser is transmitted, the tolerance temperature of the coating layer 3 is 80 ℃, the tolerance temperature of the coating layer 3 is lower than 50 ℃ due to long-time high-power laser transmission, the radial distance between the outer wall of the buffer layer 23 and the outer wall of the inner cladding layer 1 along the inner cladding layer 1 is set to be not less than 8 microns, and internal laser can be effectively prevented from leaking into the coating layer 3 when the multi-core energy-transmitting optical fiber deforms to cause heating of the coating layer 3.
Optionally, the material of the inner core 21 and/or the inner cladding 1 is high purity silicon dioxide. The high-purity silicon dioxide has better refractive index, abundant reserves and low processing cost. In this example, the purity of the silica was not less than 99.999999%. Since the transmitted laser is a high-power laser, the higher the purity of the silicon dioxide, the fewer defects exist, and the transmission loss is favorably reduced.
Preferably, the diameter of the inner core 21 is 9 μm to 100 μm. The arrangement can effectively ensure that the inner core 21 can transmit single or multiple laser beams, and the application range is enlarged. In this embodiment, a single core 2 can support high power laser transmission of 1kW and above.
Further, the diameter of the inner cladding layer 1 is 125 μm to 2000 μm. The arrangement ensures that the inner cladding layer 1 is suitable for the multi-core energy-transfer optical fiber with 2-7 cores, 9 cores, 13 cores and 19 cores applied to the current high-power laser transmission, and the application range is expanded. Fig. 1 is a schematic structural diagram of a multi-core energy transmitting optical fiber with 2 cores, and fig. 2 is a schematic structural diagram of a multi-core energy transmitting optical fiber with 4 cores.
Optionally, the core holes are evenly distributed circumferentially around the central axis of the inner cladding 1. The core hole is convenient to process by the aid of the arrangement, and processing efficiency is improved. Specifically, when the multi-core energy-transmitting optical fiber comprises 2 cores or 4 cores, the core holes are uniformly distributed in a circumference manner around the central axis of the inner cladding layer 1; when the multi-core energy-transmitting optical fiber comprises 5 cores or 7 cores, the center of the inner cladding 1 is provided with a core hole, and the rest core holes are uniformly distributed around the central axis of the inner cladding 1 in a circumferential manner.
Optionally, the inner cladding 1 is further provided with a marking hole along the axial direction, and a marking core 4 is arranged in the marking hole in a penetrating manner. The marking core 4 is arranged to facilitate the position identification of each fiber core 2 and facilitate the fusion alignment of the multi-core energy transmission fiber.
In this embodiment, the first coating layer 31 and the second coating layer 32 are both made of polymer. With the arrangement, the high temperature resistance of the first coating layer 31 and the second coating layer 32 can be effectively improved. The refractive index of the first coating layer 31 is preferably 1.37, and this arrangement is effective in reducing laser leakage. In other embodiments, one skilled in the art can set the first coating layer 31 having other refractive indexes as needed.
As shown in fig. 3, this embodiment further provides a method for manufacturing a multi-core energy-transmitting optical fiber, which includes the following steps based on the multi-core energy-transmitting optical fiber:
s1, designing the sizes of the inner cladding layer 1 and the fiber core 2;
s2, preparing an inner cladding 1, and processing a core hole on the inner cladding 1;
s3, preparing the fiber core 2, and penetrating the fiber core 2 into the core hole;
s4, a coating layer is formed on the outer periphery of the inner cladding layer 1.
The preparation method of the multi-core energy-transmitting optical fiber provided by the invention can improve the quantity of laser beams transmitted by the multi-core energy-transmitting optical fiber, improve the processing precision of laser 3D printing and laser cladding and improve the manufacturing efficiency.
In step S1, optionally, the numerical aperture of the wire core 2 is 0.08-0.28. This arrangement can effectively prevent leakage of the transmission laser. Further, those skilled in the art can set the size of the inner cladding 1, the size and number of the core holes and the diameter of the coating layer 3 according to the specific application scenario.
Alternatively, in step S2, after the inner cladding 1 is prepared, the end face of the inner cladding 1 is flattened, and then the inner cladding 1 is precisely punched to form a core hole. The accuracy of the punching process is effectively guaranteed through the leveling treatment; the precision punching process has high punching precision and high punching efficiency.
Optionally, the precision drilling is ultrasonic vibration drilling, and the drilling depth is 40cm-60 cm. This kind of setting has effectively improved the precision of punching and the qualification rate of punching. In the actual punching process, under the condition that the length of the inner cladding layer 1 is more than 60cm, punching can be performed at two ends so as to realize long-distance punching. In this embodiment, the precision of punching of precision punching is not less than ± 1 mm. And carrying out honing process treatment on the core hole after punching to ensure that the finish degree of the inner wall of the core hole is more than 12 grades.
Specifically, step S3 includes:
s31: preparing an inner core 21;
s32: carrying out fluorine doping treatment on the inner core 21 to form a fluorine-doped layer 22;
optionally, the fluorine-doped inner core 21 is treated by an in-tube method or an out-of-tube method, which facilitates precise control of the thickness of the fluorine-doped layer 22. In this embodiment, the thickness of the fluorine-doped layer 22 may be 1 mm. In other embodiments, the thickness of the fluorine-doped layer 22 can be set by one skilled in the art according to actual needs.
S33: depositing a buffer layer 23 on the outer side of the fluorine-doped layer 22 to obtain a fiber core 2;
optionally, the thickness of the buffer layer 23 is greater than that of the fluorine-doped layer 22 to ensure that the core 2 has better bending resistance to relieve the stress impact of the inner cladding layer 1 on the core 2 during use.
In this embodiment, the main material of the buffer layer 23 is silicon. Preferably, aluminum and germanium are added to buffer layer 23 to improve the ductility of the buffer layer.
Optionally, after the buffer layer 23 is prepared, the core 2 is polished to ensure the uniformity of the diameter of the core 2.
S34: the fiber core 2 is inserted into the core hole.
Further, step S4 includes:
s41: carrying out fusion and extension treatment on the inner cladding layer 1;
and carrying out fusion-shrinking treatment on the inner cladding 1 in which the fiber core 2 is arranged in the core hole, so that the fiber core 2 and the inner cladding 1 are fused and shrunk into a multi-core rod at high temperature.
S42: the inner cladding layer 1 is subjected to precision wire drawing treatment, and a coating layer 3 is prepared on the periphery of the inner cladding layer 1.
And (3) carrying out precision wire drawing treatment on the multi-core rod in a special optical fiber wire drawing tower, and preparing a first coating layer 31 and a second coating layer 32 on the outer side of the inner cladding layer 1 after the precision wire drawing treatment.
Alternatively, the process of preparing the coating layer 3 may also be completed in a precision drawing process. Illustratively, the coating layer 3 is coated on the outer side of the inner cladding layer 1, and the coating layer 3 is cured by ultraviolet light to form a stable polymer in the precision wire drawing process.
In this embodiment, step S5 is further included after step S4, and step S5 is performance testing.
And rewinding the inner cladding layer 1 with the coating layer 3 prepared on an optical fiber disc tool, and carrying out performance detection on the inner cladding layer 1 wound on the disc, wherein the performance detection comprises refractive index profile detection, end face structure detection and laser transmission test after the multi-core beam combiner is accessed for matching. And finally, the multi-core energy transmission optical fiber with the performance detection meeting the requirement can be applied to an actual scene.
Optionally, the marking core 4 includes an inner core rod and an outer cladding layer, the outer cladding layer is sleeved on the outer periphery of the inner core rod, the inner core rod is a pure silicon core, the outer cladding layer is doped with a small amount of fluorine, and the thickness of the outer cladding layer is 0.5 mm. The marking core 4 has a simple structure and is easy to manufacture. Specifically, the inner core rod is subjected to fluorine doping treatment by adopting an in-tube method or an out-tube method to form an outer cladding layer.
Fig. 4 is a flowchart of a method for manufacturing a multi-core energy-transmitting optical fiber provided with a marker core 4 according to this embodiment, in step S1, when manufacturing the multi-core energy-transmitting optical fiber provided with the marker core 4, when designing the sizes of the inner cladding 1 and the core 2, the size of the marker core 4 needs to be designed at the same time, and the specific coordinates of the marker core 4 in the inner cladding 1 are selected, and then, in step S2, the inner cladding 1 is manufactured, and the core hole and the marker hole are processed in the inner cladding 1. The step S3 includes preparing the fiber core 2 and the marker core 4, inserting the fiber core 2 into the core hole, inserting the marker core 4 into the marker hole, and finally forming the coating layer 3 on the outer periphery of the inner cladding layer 1 in the step S4.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A multi-core energy transmitting optical fiber, comprising:
the inner cladding (1), the said inner cladding (1) has at least two core holes axially;
the fiber cores (2) are correspondingly arranged in the core holes in a penetrating mode, each fiber core (2) comprises an inner core (21), a fluorine-doped layer (22) and a buffer layer (23), the fluorine-doped layers (22) are sleeved on the periphery of the inner core (21), and the buffer layers (23) are sleeved on the periphery of the fluorine-doped layers (22);
the coating layer (3) comprises a first coating layer (31) and a second coating layer (32), the first coating layer (31) is sleeved on the periphery of the inner cladding (1), and the second coating layer (32) is sleeved on the outer side of the first coating layer (31).
2. The multi-core energy-transmitting optical fiber according to claim 1, wherein the first coating layer (31) and the second coating layer (32) are both made of polymer.
3. The multi-core energy-conducting optical fiber according to claim 1, wherein the radial distance between the outer wall of the buffer layer (23) and the outer wall of the inner cladding (1) along the inner cladding (1) is not less than 8 μm.
4. The multi-core energy-transmitting optical fiber according to claim 1, wherein the material of the inner core (21) and/or the inner cladding (1) is high-purity silica.
5. The multi-core energy-transmitting optical fiber according to claim 1, wherein the diameter of the inner core (21) is 9 μm to 100 μm.
6. The multi-core energy-transmitting optical fiber according to claim 1, wherein the diameter of the inner cladding (1) is 125 μm to 2000 μm.
7. The multi-core energy-transmitting optical fiber according to claim 1, wherein the inner cladding (1) is further provided with a marking hole along the axial direction, and the marking hole is internally provided with a marking core (4).
8. A method for preparing a multi-core energy-transmitting optical fiber, based on the multi-core energy-transmitting optical fiber as claimed in any one of claims 1 to 7, comprising the steps of:
s1, designing the sizes of the inner cladding (1) and the fiber core (2);
s2, preparing the inner cladding (1) and processing the core hole on the inner cladding (1);
s3, preparing the fiber core (2), and penetrating the fiber core (2) into the core hole;
and S4, forming the coating layer (3) on the periphery of the inner cladding (1).
9. The method for preparing the multi-core energy-transmitting optical fiber according to claim 8, wherein the step S3 comprises:
s31: -preparing the inner core (21);
s32: carrying out fluorine doping treatment on the inner core (21) to form the fluorine-doped layer (22);
s33: depositing the buffer layer (23) outside the fluorine-doped layer (22) to obtain the fiber core (2);
s34: and the fiber core (2) is arranged in the core hole in a penetrating way.
10. The method for preparing the multi-core energy-transmitting optical fiber according to claim 8, wherein the step S4 comprises:
s41: carrying out fusion and extension treatment on the inner cladding (1);
s42: and carrying out precision wire drawing treatment on the inner cladding (1), and preparing the coating layer (3) on the periphery of the inner cladding (1).
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| CN202210258126.3A CN114624812A (en) | 2022-03-16 | 2022-03-16 | Multi-core energy transmission optical fiber and preparation method thereof |
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