AU2020100756A4 - A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber - Google Patents
A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 102
- 239000013307 optical fiber Substances 0.000 title claims abstract description 77
- 230000007704 transition Effects 0.000 title claims abstract description 51
- 238000005253 cladding Methods 0.000 claims abstract description 67
- 239000010453 quartz Substances 0.000 claims abstract description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000009826 distribution Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 239000011148 porous material Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
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- 230000008569 process Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 230000009022 nonlinear effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
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- 230000007774 longterm Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 238000005530 etching Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Classifications
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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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
-
- 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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention provides a multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber, characterized in that the multi-core optical fiber Fan-in/out device includes N standard single-mode optical fibers, N concave triple-clad transition fibers, N-hole quartz sleeve and N-core fiber, one end of the N concave triple-clad transition optical fibers is matched with N standard single-mode optical fibers and welded, and the other end inserted into each hole of the N-hole quartz sleeve respectively, after high-temperature tapering and cutting, it is matched and welded with the core of the N-core fiber; after tapering, the core and inner cladding of the triple clad transition fiber forms a new core, and low refractive index ring cladding and outer cladding forms a new cladding. The invention can realize ultra-low loss connection of multi-core optical fibers with high fiber core arrangement density. 7-1 4 00000 060 0000 eoe 0000000 000 Step 1 Step 2 Step 3 ... 8-1 8-2 Step 4
Description
DESCRIPTION
TITLE OF INVENTION
A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber
TECHNICAL FIELD
[0001] The invention relates to a multi-core optical fiber Fan-in/out device with a concave tripleclad transition fiber, and belongs to the technical field of multi-core optical fiber devices.
BACKGROUND ART
[0002] Multi-core optical fibers play a vital role in a space-division multiplexed optical communication transmission system. In such a high-speed, large-capacity information transmission system, a multi-core fiber Fan-in/out device is an optical fiber integrated device that separates signals from each core of multi-core fiber without interference with each other and connects with ordinary single-mode fiber. Generally speaking, a multi-core fiber Fan-in/out device needs to have the following performance characteristics: (1) covering the traditional optical communication band (C + L band); (2) each signal channel needs to withstand optical power of tens to hundreds of milliwatts (3) low insertion loss; (4) low core-to-core crosstalk; (5) small device size; (6) long-term operating stability, et.al. Therefore, whether a multi-core optical fiber splitter device that meets the above performance characteristics can prepare is the key to the full application of space division multiplexing technology in high-speed and large-capacity optical communication networks.
2020100756 15 May 2020
[0003] In 2015, Harbin Institute of Technology proposed and prepared a four-core fiber splitter (CUI, Jiwen, et al. Fan-out device for multicore fiber coupling application based on capillary bridge self- assembly fabrication method. Optical Fiber Technology, 2015, 26: 234-242.). This device uses a hydrofluoric acid etching method to make one end of four single-mode optical fibers thinner and insert them together into a low-viscosity UV glue. Then, using the capillary phenomenon, the small-diameter ends of the four optical fibers are automatically integrated and used The UV lamp is cured, the position of the optical fiber is fixed, and then the whole fiber is inserted into the sleeve, and the optical fiber bundle and the sleeve are cured by using a heat curing glue. The grinding method is used to make the end face of the optical fiber bundle flat, and finally, the multi-core optical fiber is connected with the four core fiber core. The connection end face of the multi-core optical fiber Fan-in/out device prepared by this method has glue, so it cannot be welded to the multi-core optical fiber, and the reflection on the end face will increase the insertion loss of the device.
[0004] Patent US20140369659A1 proposes a multi-core optical fiber Fan-in/out device based on the vanishing core principle. Multiple double-clad optical fibers used in the multi-core optical fiber connector constitute a fiber bundle. By using the fused tapered method, the diameter of each double-clad fiber is gradually tapered, and the light beam in the core is transferred to the inner cladding for transmission, forming a mode field distribution similar to that of a multi-core fiber. In this solution, a double-clad fiber is used. The difference between the refractive index of the core and the outer cladding of the fiber is large, which means that the doping concentration of the core is very high, which causes problems such as large scattering loss and strong nonlinear effects.
[0005] Certainly, with the unremitting efforts of global researchers, other device preparation schemes have also been developed, such as the method of using spatial lens combination coupling, 3D waveguide laser direct writing method, et.al.. However, these methods have their own shortcomings. Either the connection loss is large or the long-term stability of the device is difficult to guarantee. And with the development of multi-core optical fibers, the requirements
2020100756 15 May 2020 for space division multiplexing are getting higher and higher. A single multi-core optical fiber has long been developed from the original seven-core optical fiber to a multi-core with a larger number of cores and a higher core density optical fiber, such as 19-core fiber, 32-core fiber, et.al. These high-core-density multi-core fibers put forward higher requirements for the manufacturing process of Fan-in/out devices, because higher core density means a more accurate alignment process. The geometric position and the alignment of the multi-core fiber can well reduce the connection loss and crosstalk of each channel.
SUMMARY OF INVENTION
[0006] The objective of the invention is to provide a multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber.
[0007] The objective of the invention is achieved as follows:
[0008] A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber, characterized in that the multi-core optical fiber Fan-in/out device includes N standard singlemode optical fibers, N concave triple-clad transition fibers, N-hole quartz sleeve and N-core fiber, N is an integer greater than 1.
[0009] The concave triple-clad transition fiber consists of a core, an inner cladding, and a low refractive index ring cladding and outer cladding.
[0010] One end of the N concave triple-clad transition optical fibers is matched with N standard single-mode optical fibers and welded, and the other end inserted into each hole of the N-hole
2020100756 15 May 2020 quartz sleeve respectively, after high-temperature tapering and cutting, it is matched and welded with the core of the N-core fiber; after tapering, the core and inner cladding of the triple-clad transition fiber forms a new core, and low refractive index ring cladding and outer cladding forms a new cladding.
[0011] The core of the concave triple-clad transition fiber is a germanium-doped fiber core, the inner cladding is pure quartz, the relative refractive index difference between the core and the inner cladding is: 0.4% ~ 0.6%; the low refractive index ring cladding is a deep fluorine-doped layer, and the relative refractive index difference between the low refractive index ring cladding and the inner cladding is: -0.7% ~ -0.4%; the outer cladding is a pure quartz layer or a light fluorine-doped layer and the relative refractive index difference between the outer cladding and the inner cladding is: -0.4% ~ 0.
[0012] The refractive index distribution of the concave triple-clad transition fiber is a step refractive index distribution, or a gradient refractive index distribution.
[0013] The N-hole quartz sleeve is formed by combining N identical single-hole prefabricated components with a number of filled prefabricated components through the rod assembly method, and inserted into a large-pore quartz cylindrical sleeve of matching size, and then drawn by high temperature pressure control;
[0014] The distribution of the holes of the N-hole quartz sleeve is the same as that cores of the multi-core optical fiber, and the hole diameter is 126-130 micrometers;
[0015] The invention has at least the following prominent beneficial effects:
2020100756 15 May 2020
[0016] (1) The refractive index distribution of the core and inner cladding is the same as that of the standard single-mode optical fiber, which can achieve perfect mode field matching and reduce fusion loss.
[0017] (2) The triple-clad fiber has a ring-shaped concave low refractive index layer, so it will reduce the loss due to bending and enhance the bending resistance of the fiber.
[0018] (3) High-doped fiber core will bring higher scattering loss and lead to more serious nonlinear effects. The triple-clad transition optical fiber with low-doped fiber core design adopted by the invention reduces the scattering loss and nonlinear effect of the optical signal in the transmission process.
[0019] (4) In the invention, the holy quartz sleeve is drawn by the rod assembly method, which can more accurately ensure the diameter and space distance of each hole. This ensures the matching accuracy of the geometric distribution of the core of the prepared device output end and the geometric distribution of the multi-core optical fiber core, especially suitable for the lowloss connection of each channel of a multi-core fiber with a large number of cores and high core density.
BRIEF DESCRIPTION OF DRAWINGS
[0020] FIG. 1 is a schematic diagram of a transitional fiber with a concave triple-clad layer.
FIG. 1 (a) shows the end of structure and FIG. 1 (b) shows refractive index profile.
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[0021] FIG. 2 is a graph of the change in the shape of the end structure of the concave triple-clad transition optical fiber 1 before and after the tapering and the change of the refractive index distribution. The core 1-1 and the inner cladding 1-2 form a new core 2-1 after tapering, the low refractive index ring cladding 1-3 changes to a new cladding 2-2, and the outer cladding 1-4 changes to the new outer cladding 2-3.
[0022] FIG. 3 is a simulation result of the change of the transmitted light field after tapering of the concave triple-clad transition optical fiber 1. On the left is the diagram of the cone structure, the mode field distribution gradually transitions from the previous core to the new core; on the right is the data of power monitoring of the fundamental mode field, which can be seen that the mode field always maintains the fundamental mode transmission during the cone change process.
[0023] FIG.4 is a simulation result diagram of a taper of a fiber bundle composed of triple-clad transition fibers.
[0024] FIG. 5 is the structure and refractive index distribution diagram of the double-clad optical fiber 3 mentioned in the comparison document US20140369659Al, including the core 3-1, the inner cladding 3-2, and the outer cladding 3-3.
[0025] FIG. 6 is a refractive index distribution of a concave triple-clad transition fiber. The fiber core is doped with germanium, and the low refractive ring cladding is doped with high concentration fluorine, and the outer cladding is doped with low concentration fluorine.
[0026] FIG.7 is a concave triple-clad transition fiber with gradual refractive index distribution.
2020100756 15 May 2020
[0027] FIG. 8 shows the structure of the 32-core optical fiber 4.
[0028] FIG. 9 is a preparation step of a 32-hole quartz sleeve.
[0029] FIG. 10 is a structural diagram of a 32-core fiber Fan-in/out device, concave triple-clad transition fiber 1, 32-core fiber 4, 32-hole quartz sleeve 5, standard single-mode fiber 6, and prepared fiber bundle cone 7, fiber bundle cone after cutting end structure 7-1.
[0030] FIG. 11 is a step diagram of the preparation of a 32-core fiber Fan-in/out device.
DESCRIPTION OF EMBODIMENTS
[0031] The working principle of the invention is described below with reference to the drawings, and the 32-core fiber Fan-in/out device is taken as a specific embodiment to further illustrate the present invention.
[0032] Embodiment 1:
[0033] Firstly, a specific example is given to describe the working principle of the concave triple-cladding transitional optical fiber and device.
[0034] FIG. 1 (a) is a structural diagram of a concave triple-clad transition optical fiberl, proposed in the present invention, and FIG. 1 (b) corresponds to its refractive index distribution.
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[0035] Preferably, the core of the optical fiber is a germanium-doped core 1-1, the inner cladding is pure quartz 1-2, the radius π of the core 1-1 is 8-10 micrometers, and the radius n of the inner cladding 1-2 is 20 ~ 35 micrometers, the relative refractive index difference Δηι between the core 1-1 and the inner cladding 1-2 is 0.4% ~ 0.6%; the low refractive index ring cladding 1-3 is a deep fluorine doped layer, and the radius π is 35 ~ 62.5 micrometers. The relative refractive index difference Δηο between the low-refractive-index ring cladding 1-3 and the inner cladding 1-2 is: -0.7% ~ -0.4%; the outer cladding 1-4 is pure quartz, and the fiber radius is n= 62.5 micrometers.
[0036] After this triple-clad transition fiber is tapered, as the fiber diameter changes, its optical field confinement and transmission characteristics will change. As shown in FIG. 2, after the tapered, its core 1-1 and inner cladding 1-2 forms a new core 2-1, and the low refractive index ring cladding 1-3 and outer cladding 1-4 form a new cladding layers (2-2 and 2-3). The beam propagation method was used to simulate this tapered cone structure. The results are shown in FIG. 3. The cone structure diagram is shown on the left. The mode field distribution gradually transitions from the previous core to the new core; the right side is the power of the fundamental mode field. Monitoring, it can be seen that the mode field always keeps the fundamental mode transmission during the cone change.
[0037] As shown in FIG. 4, based on the above mentioned light field transition principle, a fiber bundle taper simulation of three triple-clad transition fibers is made. From the simulation results, it can be seen that the input light field is input to each fiber and the interval between the fibers is 250 micrometers. After passing through the fiber bundle cone, the light field is transmitted stably, forming a good fundamental mode output at the output end, and the spacing between the output light fields is compressed to 40 micrometers. Obviously this kind of transition transmission can realize the optical path connection of multi-core optical fiber and multiple standard single-mode optical fibers.
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[0038] Certainly, the patent US20140369659A1 also mentioned the use of the double-clad fiber 3 shown in FIG. 5 as the transition fiber. The optical fiber includes a core 3-1, an inner cladding 3-2 and an outer cladding 3-3. The refractive index difference between the core 3-1 and the outer cladding 3-3 is very large, which means that the core 3-1 is doped with high concentration, and the high-doped core will bring about problems such as large scattering loss and strong nonlinear effects. And in the above process of taping the fiber bundle, the fibers in the periphery of the fiber bundle will have a certain bending during the tapering process (as shown in the simulation result diagram of FIG. 4), and the bending loss resistance characteristics of this double-clad fiber are obvious disadvantage, and increases the loss of the entire device. The present invention has significant advantages in this respect. First of all, the core of the triple-clad transition fiber used in the present invention does not require a high concentration of doping. The doping process adopts the preparation process of a standard single-mode fiber, and can be perfectly welded with a standard single-mode fiber with mode field matching reducing connection loss. Secondly, the relatively low germanium doping concentration is obviously helpful to reduce the scattering loss. Finally, the triple-clad transition fiber has a low refractive index doped layer, which increases the fiber's resistance to bending loss.
[0039] From the perspective of the preparation process and further improvement of the optical fiber, the triple-clad transition optical fiber proposed by the present invention can be further improve device performance. As shown in FIG. 6, in addition to pure quartz, the outer cladding 1-4 of the optical fiber may also use a low refractive index layer with light fluorine doping as the outer cladding, and the refractive index difference between the outer cladding and the inner cladding is Ans. As shown in FIG. 7, the refractive index change of the triple-clad transition fiber can be gradual in addition to the step.
[0040] Embodiment 2:
2020100756 15 May 2020 ίο
[0041] Secondly, a specific example will be used to describe the specific embodiment of the holy sleeve, which is an essential component of the device.
[0042] A very important part of the multi-core fiber Fan-in/out device is that the geometric distribution of each channel at the output end must be precisely matched with the multi-core fiber. Especially for multi-core optical fibers with a large number of cores and high core density, this is a difficult technical problem. For this reason, the multi-core optical fiber Fan-in/out device proposed by the invention uses a precise holy sleeve.
[0043] In order to realize the Fan-in/out device of the 32-core optical fiber 4 shown in FIG. 8, the 32-hole sleeve 5 needs to be prepared according to the steps shown in FIG. 9.
[0044] Step 1: Preparation of prefabricated components: through polishing and drilling processes, arc-shaped filling member 5-1, solid square-shaped filling member 5-2, square stripshaped filling member with holes 5-3, thin-skin cylindrical sleeve 5-4, the material is pure quartz, as shown in FIG.9 (a).
[0045] Step 2: Rod assembly: according to the core distribution of the 32-core optical fiber 4, the prefabricated components in step 1 are combined to form a combined preform as shown in FIG. 9(b).
[0046] Step 3: Drawing: the combined preform was passed through a graphite furnace at 1900 degrees Celsius; air pressure in the hole of the combined preform has been controlled and then the combined preform was drawn to form a 32-hole quartz sleeve 5, as shown in FIG. 9 (c).
2020100756 15 May 2020
[0047] Specifically, the geometric parameters of the triple-clad transition fiber 1, the 32-core fiber 4, and the 32-hole quartz sleeve 5 can be shown in the following table 1:
Table 1
Unit: micrometer
| Triple-clad Transition Fiber | Core Diameter | Inner Cladding Diameter | Low Refractive Index Ring Cladding Diameter | Optical Fiber Diameter |
| 9 | 54 | 100 | 125 | |
| 32-core Optical Fiber | Core Diameter | Core Interval | Optical Fiber Diameter | - |
| 9 | 35 | 220 | - | |
| 32-hole Quartz Sleeve | Hole Diameter | Hole Interval | Sleeve Diameter | - |
| 127 | 210 | 1320 | - |
[0048] Embodiment 3:
[0049] Finally, the 32-core fiber Fan-in/out device manufacturing method is described in a preferred embodiment.
[0050] As shown in FIG. 10, it is a structural diagram of a 32-core optical fiber Fan-in/out device, which includes 32 standard single-mode optical fibers 6, 32 concave triple-clad transition optical fibers 1, 32-hole quartz sleeve 5 and 32-core fiber 4.
2020100756 15 May 2020
[0051] Specifically, the preparation steps of this 32-core optical fiber Fan-in/out device are shown in FIG. 11.
[0052] Step 1: Combination. After stripping 6 cm of the coating layer from one end of the 32 concave triple-clad transition optical fibers 1, they were inserted into each hole of the 32-hole quartz sleeve 5, respectively.
[0053] Step 2: Taper. The two ends of the assembled quartz sleeve are clamped by clamps 8-1 and 8-2, and the quartz sleeve is scanned back and forth by the oxyhydrogen flame 9 and heated for 1 minute, and then the triple-clad transition fiber 1 and the quartz sleeve 5 are bonded in the hole. Next, move the clamps 8-1 and 8-2 back to both sides at a speed of Imm/min to make the fiber bundle tapered. Stop the taper when the diameter of the cone waist is 220 micrometers, the same as the diameter of the 32-core fiber.
[0054] Step 3: Cutting. Cut at a uniform waist diameter of the fiber bundle cone, by using the fiber cleaver 10.
[0055] Step 4: Welding. The triple-clad transition optical fiber 1 is welded with a standard single-mode optical fiber 6 by using an optical fiber fusion splicer, and the welding of the end of the fiber bundle cone with the cores of 32-core optical fiber 4.
[0056] Through the above steps, the preparation of a 32-core fiber Fan-in/out device can be completed. Certainly, in order to ensure the stability and ease of use of the device, the device requests to be well packaged.
2020100756 15 May 2020
[0057] In the descriptions and drawings, typical embodiments of the present invention have been disclosed. The invention is not limited to these exemplary embodiments. The specific terms are only used for generality and illustrative meaning, and are not intended to limit the protected scope of the present invention.
Claims (5)
1. A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber, characterized in that the multi-core optical fiber Fan-in/out device includes N standard singlemode optical fibers, N concave triple-clad transition fibers, N-hole quartz sleeve and N-core fiber, N is an integer greater than 1; the concave triple-clad transition fiber consists of a core, an inner cladding, and a low refractive index ring cladding and outer cladding; one end of the N concave triple-clad transition optical fibers is matched with N standard single-mode optical fibers and welded, and the other end inserted into each hole of the N-hole quartz sleeve respectively, after high-temperature tapering and cutting, it is matched and welded with the core of the N-core fiber; after tapering, the core and inner cladding of the triple-clad transition fiber forms a new core, and low refractive index ring cladding and outer cladding forms a new cladding.
2. A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber according to claim 1, characterized in that the core of the concave triple-clad transition fiber is a germanium-doped fiber core, the inner cladding is pure quartz, the relative refractive index difference between the core and the inner cladding is: 0.4% ~ 0.6%; the low refractive index ring cladding is a deep fluorine-doped layer, and the relative refractive index difference between the low refractive index ring cladding and the inner cladding is: -0.7% ~ -0.4%; the outer cladding is a pure quartz layer or a light fluorine-doped layer and the relative refractive index difference between the outer cladding and the inner cladding is: -0.4% ~ 0.
3. A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber according to claim 1 and claim 2, characterized in that the refractive index distribution of the concave triple-clad transition fiber is a step refractive index distribution, or a gradient refractive index distribution.
2020100756 15 May 2020
4. A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber according to claim 1, characterized in that the N-hole quartz sleeve is formed by combining N identical single-hole prefabricated components with a number of filled prefabricated components through the rod assembly method, and inserted into a large-pore quartz cylindrical sleeve of matching size, and then drawn by high temperature pressure control.
5. A multi-core optical fiber Fan-in/out device with a concave triple-clad transition fiber according to claim 1, characterized in that the distribution of the holes of the N-hole quartz sleeve is the same as that cores of the multi-core optical fiber, and the hole diameter is 126-130 micrometers.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113880420A (en) * | 2021-10-12 | 2022-01-04 | 桂林电子科技大学 | Preparation method of large-size multi-core optical fiber preform based on 3D printing adaptive sleeve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113880420A (en) * | 2021-10-12 | 2022-01-04 | 桂林电子科技大学 | Preparation method of large-size multi-core optical fiber preform based on 3D printing adaptive sleeve |
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