Single-core optical fiber bundle component and multi-core optical fiber fan-in and fan-out device

Abstract

The utility model relates to a single-core optical fiber bundle component and a multi-core optical fiber fan-in and fan-out device, the single-core optical fiber bundle component comprises a single-core optical fiber bundle, a first capillary tube, a lens array and a first focusing lens, the single-core optical fiber bundle penetrates into the first capillary tube to be fixed, and the single-core optical fiber bundle is arranged corresponding to the lens array; the lens array can realize light spot size adjustment and collimation of each single-core optical fiber in the single-core optical fiber bundle, and the front end of the lens array is provided with a first focusing lens. The multi-core optical fiber fan-in and fan-out device comprises a single-core optical fiber bundle component and a multi-core optical fiber component, the single-core optical fiber bundle component and the multi-core optical fiber component are in coupling connection, the number of fiber cores of multi-core optical fibers is the same as that of the single-core optical fibers, and the arrangement mode of the fiber cores of the multi-core optical fibers is consistent with the arrangement mode of the multiple single-core optical fibers. The single-core optical fiber bundle component is suitable for butt joint of multi-core optical fiber components with different core numbers, and the manufactured multi-core optical fiber fan-in and fan-out device is good in coupling effect and easy to form.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber connection, in particular to a single-core optical fiber bundle component and a multi-core optical fiber fan-in fan-out device. BACKGROUND

[0002] With the increasing demand for information, the traditional single-core single-mode optical fiber technology has encountered a bottleneck, mainly due to the limited bandwidth of signal transmission and optical amplifier. In order to meet the growing demand for communication capacity, space division multiplexing technology has become the best choice after time division multiplexing, wavelength division multiplexing and polarization multiplexing.

[0003] Multi-core optical fiber (MCF) based on space division multiplexing technology has become one of the main directions of research and development in the field of optical fiber communication. However, the structure and size of multi-core optical fiber are different from standard single-core optical fiber, and cannot be directly connected with it. How to efficiently multiplex and demultiplex the signals in each core becomes an important challenge for the application of multi-core optical fiber.

[0004] Multi-core optical fiber simultaneously transmits multiple signals into different cores. In order to ensure compatibility with existing single-mode optical fiber communication systems, high-efficiency low-loss fan-in fan-out devices are needed to guide each signal to an independent single-mode optical fiber, so that each signal in the multi-core optical fiber can be directly used. Therefore, the research and development of multi-core optical fiber fan-in fan-out technology is crucial for promoting the application of multi-core optical fiber in ultra-high capacity transmission, and is expected to provide more solutions to meet the growing demand for information and promote the further development of communication technology. In the prior art, in order to realize the guidance of each signal in the multi-core optical fiber to an independent single-mode optical fiber, a fusion taper method or a polymer waveguide method is used. The fusion taper method involves customizing optical fiber, which is complex in process and difficult to achieve accurate fusion. The consistency of the process is not easy to guarantee. The polymer waveguide method is limited by process and material, and the preparation method is not mature, with large loss and high cost. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above technical problems, the present application provides a single-core optical fiber bundle component and a multi-core optical fiber fan-in fan-out device. The single-core optical fiber bundle component is suitable for butt joint use of multi-core optical fiber components with different core numbers, and the prepared multi-core optical fiber fan-in fan-out device has good coupling effect and simple forming.

[0006] In order to achieve the above technical purpose, the technical scheme adopted is: a single-core optical fiber bundle component, comprising a single-core optical fiber bundle, a first capillary tube, a lens array and a first focusing lens, the single-core optical fiber bundle is fixed in the first capillary tube, the front end of the single-core optical fiber bundle is provided with the lens array, the lens array 104 can adjust and collimate the spot size of each single-core optical fiber in the single-core optical fiber bundle, and the front end of the lens array is provided with the first focusing lens.

[0007] The front end face of the single-core optical fiber bundle is coated with an anti-reflection film.

[0008] The front and back faces of the lens array are both coated with an anti-reflection film.

[0009] The front end face of the single-core optical fiber bundle and the lens array are glued with a glue with a refractive index matching the two sides.

[0010] The single-core optical fiber bundle further comprises a first sleeve for fixing the relative positions of the first capillary and the first focusing lens.

[0011] When the single-core optical fiber bundle has an even number of single-core optical fibers, the single-core optical fibers in the single-core optical fiber bundle are centrally symmetric, and all the lens parameters in the corresponding lens array are consistent.

[0012] When the single-core optical fiber bundle has an odd number of single-core optical fibers, there is a central single-core optical fiber, and the remaining single-core optical fibers are centrally symmetric around the central single-core optical fiber as the center, and the fiber cores on the same circle have equal distances from the center.

[0013] The lens parameters of the lens array corresponding to the remaining single-core optical fibers are the same, and the lens parameters of the lens array corresponding to the central single-core optical fiber are different from those of the lens array corresponding to the remaining single-core optical fibers.

[0014] The multi-core fiber fan-in / fan-out device comprises a single-core optical fiber bundle component and a multi-core optical fiber component, the single-core optical fiber bundle component and the multi-core optical fiber component are coupled, the multi-core optical fiber component comprises a multi-core optical fiber, a second capillary and a second focusing lens, the multi-core optical fiber is installed in the second capillary, the single-core optical fiber bundle component is the single-core optical fiber bundle component described above, the number of fiber cores of the multi-core optical fiber is the same as the number of single-core optical fibers of the single-core optical fiber bundle, and the arrangement mode of the fiber cores of the multi-core optical fiber is consistent with the arrangement mode of the single-core optical fiber bundle.

[0015] The rear end face of the multi-core optical fiber is coated with an anti-reflection film.

[0016] The first focusing lens and / or the second focusing lens are plano-convex lenses or self-focusing lenses.

[0017] The front and back faces of the first focusing lens and / or the second focusing lens are both coated with an anti-reflection film.

[0018] The second focusing lens and the rear end face of the multi-core optical fiber, and / or the first focusing lens and the lens array are glued with a glue with a refractive index matching the two sides.

[0019] The multi-core fiber fan-in / fan-out device further comprises a second sleeve for fixing the relative positions of the second capillary and the second focusing lens.

[0020] A multi-core fiber fan-in fan-out device further comprises a protection tube for fixing the relative positions of the single-core fiber bundle component and the multi-core fiber component.

[0021] The present application has the following advantages:

[0022] 1. The single-core fiber bundle component of the present application does not need to consider the spacing between the single-core fibers in the single-core fiber bundle, the precision of the single-core fibers is guaranteed, and the single-core fiber bundle does not need to be expanded or heated. Only the conventional single-core fibers need to be bundled, ground at the front end, and aligned with the lens array. The operation is easier, the precision and consistency of the single-core fiber cladding without additional processing are higher, and the fan-in fan-out can be realized regardless of the form of the bundle or the dispersed form. The multi-core fiber component can be matched with various core numbers, and the parameters and arrangement form of the single-core fiber bundle can be flexibly adjusted according to the parameters of the coupled multi-core fiber component to achieve the required spot size and collimation effect of the single-core fiber bundle and obtain a better coupling efficiency.

[0023] 2. The antireflection film is deposited on the surface of the optical component to reduce surface reflection. The optical thin film increases the transmittance of the optical system, reduces the loss of transmitted light, and thus increases the transmittance of the focusing lens, the microlens, and the multi-core fiber. The receiving and transmission efficiency is further improved, and the application range is wider.

[0024] 3. The plane of the plano-convex lens and the self-focusing lens can make the passing light rays remain parallel, and the convex surface of the plano-convex lens can converge or diverge the light rays, thereby realizing beam shaping. When parallel light is incident from the convex surface, the light rays undergo twice refraction, the aberration correction effect on the light beam is better, the focusing effect is better, and the spherical aberration is smaller. When parallel light is incident from the plane, the collimation performance of the outgoing light is better. The self-focusing lens utilizes the feature that the gradient refractive index distribution gradually decreases along the radial direction, so that the light transmitted along the axial direction is continuously refracted, thereby realizing the smooth and continuous convergence of the outgoing light rays to a point. The self-focusing lens is light and has high imaging resolution.

[0025] 4. The first sleeve is used to position the first capillary tube and the first focusing lens, thereby ensuring the relative positions therebetween and ensuring the alignment of the single-core fiber bundle in the first capillary tube with the first focusing lens.

[0026] 5. The single-core fiber bundle component and the multi-core fiber component provided by the present application are coupled, connected, and aligned, the light beams of the two are one-to-one coupled, the single-core fiber bundle is fan-out to the multi-core fiber, and the multi-core fiber is fan-in to the single-core fiber bundle. The front end of the single-core fiber bundle is in the form of a lens array, which can obtain a matched spot size and light path state as needed, and then the first focusing lens is used for beam expansion and collimation. After the multi-core fiber passes through the second focusing lens, the light path and the spot are matched, and a better coupling efficiency is obtained.

[0027] 6、The second sleeve is used to position the second capillary and the second focusing lens, so as to ensure the position between the two, that is, to ensure the alignment of the multicore optical fiber in the second capillary and the second focusing lens.

[0028] 8、The point gluing is used to realize the light transmission efficiency between the lens array and the single-core fiber bundle, the first focusing lens and the lens array, and the second focusing lens and the multicore optical fiber, so as to realize the fixing between the elements and the antireflection effect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a single-core fiber bundle component of the present application;

[0030] Figure 2 It is a cross-sectional view of a multicore fiber fan-in fan-out device of the present application;

[0031] Figure 3 It is a schematic view of a multicore fiber fan-in fan-out device of the present application;

[0032] Figure 4 It is a schematic view of a multicore fiber component of the present application;

[0033] Figure 5 It is a schematic view of a multicore fiber component of the present application;

[0034] Figure 6 It is a schematic view of a multicore fiber component of the present application;

[0035] Figure 7 It is a schematic view of a multicore fiber component of the present application;

[0036] Figure 8 It is a schematic view of a multicore fiber component of the present application;

[0037] Figure 9 It is a schematic view of a multicore fiber component of the present application;

[0038] Figure 10 It is a schematic view of a multicore fiber component of the present application;

[0039] Figure 11 It is a schematic view of a multicore fiber component of the present application;

[0040] Figure 12 It is a schematic view of a multicore fiber component of the present application;

[0041] Figure: 1, single-core optical fiber bundle member, 100, single-core optical fiber bundle, 101, first capillary tube, 102, first focusing lens, 103, first sleeve, 104, lens array, 1001, single-core optical fiber;

[0042] 2, multi-core optical fiber member, 200, multi-core optical fiber, 201, second capillary tube, 202, second focusing lens, 203, second sleeve;

[0043] 3, protective tube. DETAILED DESCRIPTION

[0044] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0045] It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The shape, number and proportion of each component when actually implemented can be arbitrarily changed, and the layout pattern of the components can also be more complex.

[0046] The structure, proportion, size, etc. shown in the diagrams attached to the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the conditions that can be implemented by the present application. Therefore, any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present application.

[0047] The orientations or positional relationships indicated by terms such as "upper", "lower", "left", "right", "intermediate", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential" in the present specification are based on the orientations or positional relationships shown in the drawings, and are only used to simplify the description. Therefore, it cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] As Figure 1As shown in the figure, a single-core fiber bundle component includes a single-core fiber bundle 100, a first capillary tube 101, a lens array 104 and a first focusing lens 102. The single-core fiber bundle 100 is fixed in the first capillary tube 101 by glue. When the fiber is inserted into the first capillary tube 101, the fiber is usually inserted into the bare fiber composed of the core and the cladding. The single-core fiber bundle 100 is composed of a plurality of single-core fibers 1001, and the single-core fiber 1001 is a bare fiber. Figure 7 、 Figure 8 As shown in the figure, the number of holes in the first capillary tube 101 for installing the single-core fiber bundle can be a single large hole for installing the single-core fiber bundle 100 in the form of a bundle, or a multi-hole structure with the number of holes consistent with the number of single-core fibers 1001 of the single-core fiber bundle 100. The front end of the single-core fiber bundle 100 is polished, and the front end corresponds to the lens array 104. The lens array 104 can be installed in the first capillary tube 101 or installed in another support (capillary tube). The lens array 104 can adjust the spot size and collimate each single-core fiber in the single-core fiber bundle 100. The specific implementation form is that the arrangement mode of the single-core fiber 1001 in the single-core fiber bundle 100 is consistent with the arrangement mode of the lens in the lens array 104, so that each single-core fiber corresponds to a lens. The lens array 104 is provided with the first focusing lens 102. The single-core fiber bundle component can realize spot expansion and collimation of the light beam, and at the same time, the size is smaller and the angle of deviation is smaller.

[0049] The front end of the single-core fiber bundle 100 is coated with an anti-reflection film, which can improve the light transmittance of the single-core fiber bundle 100, reduce the loss of transmitted light, and be used in high-power connectors. The front and back of the lens array 104 are coated with anti-reflection films, which have the same effect.

[0050] The first focusing lens 102 is a plano-convex lens or a self-focusing lens, which is reasonably selected according to the required effect.

[0051] The front and back of the first focusing lens 102 are coated with anti-reflection films, which can improve the light transmittance of the first focusing lens 102, reduce the loss of transmitted light, and be used in high-power connectors.

[0052] The first focusing lens 102 and the lens array 104 are point-glued with a glue with a refractive index matched with the two sides, which realizes the anti-reflection effect, improves the light transmission effect between the first focusing lens 102 and the lens array 104, and the point-gluing and the anti-reflection film are not used together. Similarly, the front end of the single-core fiber bundle 100 and the lens array 104 can be point-glued with a glue with a refractive index matched with the two sides.

[0053] A single-core fiber bundle component further comprises a first sleeve 103 for fixing the relative positions of the first capillary tube 101 and the first focusing lens 102, and fixing the components in the single-core fiber bundle to ensure the accuracy of the single-core fiber bundle component.

[0054] The specific implementation form that the arrangement of the single-core fibers 1001 in the single-core fiber bundle 100 is consistent with the arrangement of the lenses in the lens array 104 is that when the single-core fiber bundle 100 is even, the single-core fibers in the single-core fiber bundle 100 are centrally symmetric, and all the lens parameters in the corresponding lens array 104 are consistent. When the single-core fiber bundle 100 is odd, there is a central single-core fiber, and the remaining single-core fibers are centrally symmetric around the central single-core fiber as the center, and the single-core fibers on the same circle have equal distances from the center. When the remaining single-core fibers are arranged in a central symmetric structure of multiple circles, the single-core fibers on each circle have equal distances from the central single-core fiber. The lens parameters of the lens array 104 corresponding to the remaining single-core fibers are the same, and the lens parameters of the lens array 104 corresponding to the central single-core fiber are different from the lens parameters of the lens array 104 corresponding to the remaining single-core fibers.

[0055] Taking a single-core fiber bundle 100 composed of four single-core fibers as an example, as shown in Figure 7 If the four single-core fibers of the single-core fiber bundle 100 in the left side of the figure are closely arranged, that is, the gap between the four single-core fibers is as small as possible, and the wall thickness between the mounting holes for mounting the single-core fibers in the first capillary tube 101 is small, the position arrangement of the lens array in the corresponding right side of the figure is consistent with the position arrangement of the single-core fiber bundle 100, and since the four cores are uniformly distributed in a circle, the four lens parameters of the lens array are the same, which plays a role in enlarging and straightening the fiber spot. Figure 8 If the four single-core fibers of the single-core fiber bundle 100 in the left side of the figure are independently arranged, that is, the gap between the four single-core fibers is large, and the wall thickness between the mounting holes for mounting the single-core fibers in the first capillary tube 101 is thick, the position accuracy of the fiber can be independently controlled at this time, the position arrangement of the lens array in the corresponding right side of the figure is consistent with the position arrangement of the single-core fiber bundle 100, and since the four single-core fibers are uniformly distributed in a circle, the four lens parameters of the lens array are the same. Since the four cores are arranged separately, the core spacing is increased, and the fiber spot needs to be enlarged more, and the lens parameters will be different from Figure 7 The lens array plays a role in enlarging and straightening the fiber spot.

[0056] Taking a single-core fiber bundle 100 composed of seven single-core fibers as an example, as shown in Figure 9As shown, the single-core fiber bundle composed of seven single-core fibers is closely arranged, the position arrangement of the corresponding lens array is consistent with the position arrangement of the fibers, and due to the circumferential six single-core fibers of the seven single-core fibers being uniformly distributed, the middle core is different, so the circumferential six lens parameters of the lens array are the same, and the corresponding lens parameter of the middle single-core fiber is different from the other six. For example Figure 10 As shown, the single-core fiber bundle composed of seven single-core fibers is independently arranged, the core spacing is increased, the fiber spot needs to be enlarged more, and the lens parameters shown in Figure 9 will be different. The lens array plays a role of enlarging and flattening the fiber spot.

[0057] The conventional thermal core expansion fiber method has an upper limit of core expansion, and the core spacing of the single-core fiber bundle is positively related to the size of the expanded core, so the core spacing of the single-core fiber is not suitable to be too large, and needs to be closely arranged. However, close arrangement will cause irregular arrangement due to the inconsistency of the fiber cladding size, affecting the coupling effect. The single-core fiber bundle and the lens array are combined in the present application, the core spacing does not need to be considered, the thermal core expansion treatment is not needed, it is easier to operate, and the fiber cladding precision and consistency are higher. The parameters and arrangement of the lens array can be changed according to the arrangement of the single-core fiber bundle, so as to achieve the required spot size and collimation effect of the single-core fiber bundle.

[0058] Different single-core fiber distribution methods can be selected according to the requirements, and the independent distribution of the single-core fiber is more conducive to the precision control of the fiber position. Different single-core fiber distribution methods correspond to different lens arrays, and the enlargement requirements of the fiber mode field diameter are different.

[0059] For example Figure 2 , Figure 3 , Figure 4As shown, a multi-core fiber fan-in fan-out device includes a single-core fiber bundle component 1 and a multi-core fiber component 2, which are coupled to couple the multi-core fiber with the single-core fiber bundle, and realize the fan-in and fan-out of the multi-core fiber and the single-core fiber bundle. The multi-core fiber component 2 includes a multi-core fiber 200, a second capillary 201, and a second focusing lens 202. The multi-core fiber 200 is installed in the second capillary 201 and is fixed in the second capillary by glue. The rear end of the multi-core fiber 200 (the end pointing to the single-core fiber bundle component) is a polished surface and corresponds to the second focusing lens 202. The number of cores of the multi-core fiber 200 is the same as the number of single-core fibers of the single-core fiber bundle 100, and the core arrangement mode of the multi-core fiber 200 is consistent with the single-core fiber arrangement mode of the single-core fiber bundle 100. The single-core fiber arrangement mode of the single-core fiber bundle 100 has been described in detail above and will not be described again. The front end of the single-core fiber bundle corresponds to the lens array, and the matched spot size and optical path state can be obtained as needed, and then the first focusing lens is used for beam expansion and collimation. The light path and the spot of the multi-core fiber after passing through the second focusing lens are matched to obtain a better coupling efficiency.

[0060] The multi-core fiber component 2 realizes spot amplification and collimation of the light beam output by the multi-core fiber. In the above description, the number of cores of the multi-core fiber is divided into even and odd cores. The multi-core fiber is described by taking four-core and seven-core as examples. The cross-sectional view is as shown in Figure 5 、 Figure 6 For the multi-core fiber 200 with an even number of cores, each pair of cores is arranged diagonally and has an equal distance from the center, such as 2 cores (1 corresponds to 2), 4 cores (1 corresponds to 4, 2 corresponds to 3), 8 cores (1 corresponds to 5, 2 corresponds to 6, 3 corresponds to 7, 4 corresponds to 8), and the like, as shown in Figure 11 For the multi-core fiber with an odd number of cores, the even part maintains the above rules, such as 7 cores and 19 cores, as shown in Figure 12

[0061] The rear end surface of the multi-core fiber 200 is coated with an anti-reflection film, which can improve the light transmittance and high power resistance of the multi-core fiber 200, improve the receiving and transmission efficiency, and have a wider application range.

[0062] The second focusing lens 202 is a plano-convex lens or a self-focusing lens.

[0063] The front and rear surfaces of the second focusing lens 202 are coated with an anti-reflection film, which can improve the light transmittance of the second focusing lens 202, reduce the loss of transmitted light, and be used in high-power connectors.

[0064] ​The second focusing lens 202 and the rear end face of the multi-core optical fiber 200 are glued with glue with refractive index matching on both sides, and the antireflection effect is realized by the form of glueing, so as to improve the light transmission effect between the second focusing lens 202 and the multi-core optical fiber 200.

[0065] The multi-core optical fiber fan-in and fan-out device further comprises a second sleeve 203 for fixing the relative positions of the second capillary tube 201 and the second focusing lens 202. Whether the first sleeve or the second sleeve can be manufactured by using non-metallic tubes (glass tubes) or metallic tubes (copper tubes).

[0066] The multi-core optical fiber fan-in and fan-out device further comprises a protective tube 3 for fixing the relative positions of the single-core optical fiber bundle member 1 and the multi-core optical fiber member 2. The protective tube 3 has two embodiments: (1) wrapped around the periphery of the first glass tube 103 and the second sleeve 203 to achieve protection; (2) wrapped around the periphery of the first capillary tube 101 and the second capillary tube 201 to achieve protection. The above is only a preferred example of the present application and is not used for limiting or defining the present application. The present application can have various modifications and changes for researchers or technicians in the field. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope declared by the present application.

Claims

1. A single core optical fiber strand member characterized by: It comprises a single-core optical fiber bundle (100), a first capillary tube (101), a lens array (104) and a first focusing lens (102), the single-core optical fiber bundle (100) is fixed in the first capillary tube (101), the front end of the single-core optical fiber bundle (100) is provided with the lens array (104), the lens array (104) can adjust and collimate the spot size of each single-core optical fiber in the single-core optical fiber bundle (100), and the front end of the lens array (104) is provided with the first focusing lens (102).

2. A unitary optical fiber strand member as defined in claim 1, wherein: The front end face of the single-core optical fiber bundle (100) is coated with an anti-reflection film.

3. A unitary optical fiber strand member as defined in claim 1, wherein: The front and back faces of the lens array (104) are both coated with an anti-reflection film.

4. A unitary optical fiber strand member as defined in claim 1, wherein: The front end face of the single-core optical fiber bundle (100) and the lens array (104) are point-glued with a colloid with a refractive index matched with both sides.

5. A unitary optical fiber strand member as defined in claim 1, wherein: It further comprises a first sleeve (103) for fixing the relative positions of the first capillary tube (101) and the first focusing lens (102).

6. A unitary optical fiber strand member as defined in claim 1, wherein: When the single-core optical fiber bundle (100) is even, the single-core optical fibers in the single-core optical fiber bundle (100) are centrally symmetric, and all the lens parameters in the corresponding lens array (104) are consistent.

7. A unitary optical fiber strand member as defined in claim 1, wherein: When the single-core optical fiber bundle (100) is odd, there is a central single-core optical fiber, and the remaining single-core optical fibers are centrally symmetric around the central single-core optical fiber as the center, and the single-core optical fibers on the same circle have equal distances from the center.

8. A unitary optical fiber strand member as defined in claim 7, wherein: The lens parameters of the lens array (104) corresponding to the remaining single-core optical fibers are the same, and the lens parameters of the lens array (104) corresponding to the central single-core optical fiber are different from those of the lens array (104) corresponding to the remaining single-core optical fibers.

9. A multicore fiber fan-in fan-out device, comprising a single-core fiber bundle member (1) and a multicore fiber member (2), the single-core fiber bundle member (1) and the multicore fiber member (2) being coupled, the multicore fiber member (2) comprising a multicore fiber (200), a second capillary tube (201) and a second focusing lens (202), the multicore fiber (200) being mounted in the second capillary tube (201), characterized in that: The single-core optical fiber bundle component (1) is the single-core optical fiber bundle component (1) of any one of claims 1-8, the number of fiber cores of the multi-core optical fiber (200) is the same as the number of single-core optical fibers of the single-core optical fiber bundle (100), and the arrangement mode of the fiber cores of the multi-core optical fiber (200) is consistent with the arrangement mode of the single-core optical fiber bundle (100).

10. A multi-fiber optical fiber fan-in / fan-out device as described in claim 9, wherein: The rear end face of the multi-core optical fiber (200) is coated with an anti-reflection film.

11. A multi-fiber optical fiber fan-in / fan-out device as described in claim 9, wherein: The first focusing lens (102) and / or the second focusing lens (202) is a plano-convex lens or a self-focusing lens.

12. A multi-fiber optical fiber fan-in / fan-out device as described in claim 9, wherein: The front and back faces of the first focusing lens (102) and / or the second focusing lens (202) are both coated with an anti-reflection film.

13. A multi-fiber optical fiber fan-in / fan-out device as described in claim 9, wherein: The rear end face of the second focusing lens (202) and the multi-core optical fiber (200) and / or the first focusing lens (102) and the lens array (104) are point-glued with a colloid with a refractive index matched with both sides.

14. A multi-fiber optical fiber fan-in / fan-out device as described in claim 9, wherein: It further comprises a second sleeve (203) for fixing the relative positions of the second capillary tube (201) and the second focusing lens (202).

15. A multi-fiber optical fiber fan-in / fan-out device as claimed in claim 9 or 14, characterized by: It further comprises a protective tube (3) for fixing the relative positions of the single-core optical fiber bundle component (1) and the multi-core optical fiber component (2).

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