Hollow optical fiber mode field conversion adapter and processing method thereof

Abstract

The invention relates to the field of adapters, provides a hollow optical fiber mode field conversion adapter and a processing method thereof, and aims to solve the problem of optical path loss caused by direct butt joint of a hollow optical fiber and a solid optical fiber in the prior art. The optical path converter is embedded in the inner cavity, one end of the optical path converter is used for being connected with a hollow optical fiber connector through the inner cavity, and the other end of the optical path converter is used for being connected with a solid optical fiber connector through the inner cavity; the optical path of the hollow optical fiber in the hollow optical fiber connector is in butt joint with the optical path of the solid optical fiber of the solid optical fiber connector through the optical path converter.

Description

Technical Field

[0001] The present application relates to the field of adapters, and more specifically, to a hollow optical fiber mode field conversion adapter and a processing method thereof. Background Art

[0002] With the development of emerging technologies such as big data, cloud computing and the Internet of Things, the demand for high-speed, large-capacity, and low-loss optical communication systems is increasing. Among them, the maximum capacity of traditional single-mode fiber (SMF) transmission systems is believed to be around 100Tbit / s. This limit is determined by the signal-to-noise ratio and bandwidth. Although more potential can be tapped through advanced coding technology, physical limitations are inevitable; solid-core optical fibers have gradually exposed the problem of being difficult to meet low-latency services, serious nonlinear effects, and difficulty in continuously improving the maximum transmission capacity; traditional glass-core optical fibers have capacity bottlenecks and performance limits due to material limitations, making it difficult to meet these requirements. The rise of hollow-core optical fiber technology has provided new hope for optical communication systems.

[0003] Hollow-core optical fiber is based on a new anti-resonance light-guiding mechanism, which can break through the limits of delay, attenuation and capacity. Hollow-core optical fiber has the advantages of low delay, high input fiber power, low attenuation, large bandwidth, low Rayleigh scattering and low dispersion. The many advantages of hollow-core optical fiber provide a new solution for high-speed communication.

[0004] From the perspective of application in the communication field, hollow-core optical fiber has great advantages in performance compared with the currently widely used glass-core optical fiber, but since solid-core optical fiber is still the mainstream in the market, how to switch hollow-core optical fiber with solid-core optical fiber in landing applications is a big problem. Because the mode field diameter of solid optical fiber is about 9um, while the mode field diameter of hollow optical fiber is above 20um, it is obvious that the mode field diameter of solid optical fiber does not match the mode field diameter of hollow optical fiber. If the two are directly connected, it will cause loss of optical path.

[0005] Therefore, the prior art needs to be improved. Summary of the invention

[0006] The purpose of the present application is to provide a hollow fiber mode field conversion adapter and a processing method thereof, so as to solve the problem that the existing hollow fiber and the solid fiber will cause optical path loss when they are directly connected.

[0007] To achieve the above objectives, the technical solution adopted in the first aspect of the embodiment of the present application is:

[0008] A hollow optical fiber mode field conversion adapter, comprising:

[0009] The adapter housing has inner cavities extending through both ends thereof;

[0010] An optical path converter is embedded in the inner cavity, one end of the optical path converter is used to connect with the hollow optical fiber connector through the inner cavity, and the other end of the optical path converter is used to connect with the solid optical fiber connector through the inner cavity;

[0011] The optical path of the hollow optical fiber in the hollow optical fiber connector is connected to the optical path of the solid optical fiber of the solid optical fiber connector through an optical path converter.

[0012] According to the hollow-core optical fiber mode field conversion adapter described above, the optical path converter is a convex lens or a lens group.

[0013] According to the hollow fiber mode field conversion adapter described above, a first positioning hole and a second positioning hole are respectively provided at both ends of the optical path converter, the first positioning hole is used to install the first ferrule of the hollow fiber connector, and the second positioning hole is used to install the second ferrule of the solid fiber connector.

[0014] According to the hollow-core optical fiber mode field conversion adapter described above, a third positioning hole and a fourth positioning hole are respectively provided at both ends of the optical path converter, and the hollow-core optical fiber mode field conversion adapter further includes:

[0015] A first limiting sleeve is embedded in the third positioning hole and is used to install the first ferrule of the hollow-core optical fiber connector. The first limiting sleeve is penetrated by a first through hole, and the optical path of the hollow-core optical fiber of the hollow-core optical fiber connector is injected into the optical path converter through the first through hole;

[0016] The second limiting sleeve is embedded in the fourth positioning hole and is used to install the second core of the solid optical fiber connector. The second limiting sleeve is penetrated by a second through hole. The light path through the optical path converter is connected with the light path of the solid optical fiber of the solid optical fiber connector through the second through hole.

[0017] According to the hollow-core optical fiber mode field conversion adapter described above, the first limiting sleeve includes:

[0018] A first limiting sleeve is embedded in the third positioning hole, and a first through hole is formed on an end of the first limiting sleeve close to the optical path converter;

[0019] The first position-limiting through-core is embedded in the first position-limiting sleeve and is used for installing the first insert core of the hollow optical fiber connector.

[0020] According to the hollow-core optical fiber mode field conversion adapter described above, the second limiting sleeve includes:

[0021] A second limiting sleeve is embedded in the fourth positioning hole, and a second through hole is formed on an end of the second limiting sleeve close to the optical path converter;

[0022] The second position-limiting through-core is embedded in the second position-limiting sleeve and is used for installing the second insert core of the solid optical fiber connector.

[0023] According to the hollow-core optical fiber mode field conversion adapter described above, the hollow-core optical fiber mode field conversion adapter also includes:

[0024] A marking portion, which is disposed on the adapter housing at one end of the optical path converter for connecting with the hollow optical fiber connector;

[0025] Or it is arranged on the adapter housing at one end of the optical path converter for connecting with the solid optical fiber connector.

[0026] The technical solution adopted in the second aspect of the embodiment of the present application is: it is applied to the hollow-core optical fiber mode field conversion adapter as described above, and the processing method includes:

[0027] An adapter housing is provided, wherein two ends of the adapter housing are provided with inner cavities therethrough;

[0028] An optical path converter is provided and built into the inner cavity of the adapter housing to obtain a hollow optical fiber mode field conversion adapter.

[0029] According to the processing method of the hollow-core optical fiber mode field conversion adapter described above, an optical path converter is provided, and the optical path converter is built into the inner cavity of the adapter housing. In the step of obtaining the hollow-core optical fiber mode field conversion adapter, a first positioning hole and a second positioning hole are respectively provided at both ends of the optical path converter, and the first positioning hole is used to install the first ferrule of the hollow-core optical fiber connector, and the second positioning hole is used to install the second ferrule of the solid-core optical fiber connector.

[0030] According to the processing method of the hollow fiber mode field conversion adapter described above, an optical path converter is provided, and the optical path converter is built into the inner cavity of the adapter shell. In the step of obtaining the hollow fiber mode field conversion adapter, a third positioning hole and a fourth positioning hole are respectively opened at both ends of the optical path converter, and a first limiting sleeve is embedded in the third positioning hole, and the first limiting sleeve is used to install the first ferrule of the hollow fiber connector, and the first limiting sleeve is penetrated by a first through hole; the fourth positioning hole is embedded in the second limiting sleeve, and the second limiting sleeve is used to install the second ferrule of the solid fiber connector, and the second limiting sleeve is penetrated by a second through hole.

[0031] The hollow-core optical fiber mode field conversion adapter and the processing method thereof provided by the present application have at least the following beneficial effects:

[0032] The present application has a built-in optical path converter in the adapter housing, and the hollow fiber connector and the solid fiber connector can be connected to the two ends of the optical path converter through the inner cavity respectively, so that the optical path of the hollow fiber in the hollow fiber connector and the optical path of the solid fiber in the solid fiber connector can be connected through the optical path converter, so that the optical path of the hollow fiber is matched with the optical path of the solid fiber, thereby reducing the loss of the optical path connection between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A structural schematic diagram of an embodiment of a hollow-core optical fiber mode field conversion adapter provided in an embodiment of the present application.

[0035] Figure 2 for Figure 1 AA cross-sectional view.

[0036] Figure 3 A schematic structural diagram of another embodiment of a hollow-core optical fiber mode field conversion adapter provided in an embodiment of the present application.

[0037] Figure 4 for Figure 1 A cross-sectional view of the BB.

[0038] Figure 5 A flowchart of a method for processing a hollow-core optical fiber mode field conversion adapter provided in an embodiment of the present application.

[0039] Among them, the reference numerals in the figure are:

[0040] 1. Adapter housing; 2. Optical path converter; 3. Hollow fiber connector; 31. First ferrule; 4. Solid fiber connector; 41. Second ferrule; 5. First limiting sleeve; 51. First limiting sleeve shell; 511. First through hole; 52. First limiting through core; 6. Second limiting sleeve; 61. Second limiting sleeve shell; 611. Second through hole; 62. Second limiting through core. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0043] With the development of emerging technologies such as big data, cloud computing and the Internet of Things, the demand for high-speed, large-capacity, and low-loss optical communication systems is increasing. Among them, the maximum capacity of traditional single-mode fiber (SMF) transmission systems is believed to be around 100Tbit / s. This limit is determined by the signal-to-noise ratio and bandwidth. Although more potential can be tapped through advanced coding technology, physical limitations are inevitable; solid-core optical fibers have gradually exposed the problem of being difficult to meet low-latency services, serious nonlinear effects, and difficulty in continuously improving the maximum transmission capacity; traditional glass-core optical fibers have capacity bottlenecks and performance limits due to material limitations, making it difficult to meet these requirements. The rise of hollow-core optical fiber technology has provided new hope for optical communication systems.

[0044] Hollow-core optical fiber is based on a new anti-resonant light-guiding mechanism, which can break through the limits of delay, attenuation and capacity. Hollow-core optical fiber has the advantages of low delay, high fiber input power, low attenuation, large bandwidth, low Rayleigh scattering and low dispersion. Specifically, the delay of hollow-core optical fiber is about 30% lower than that of traditional solid-core optical fiber. For example, the delay of glass core optical fiber is about 5 microseconds / km, while that of hollow-core optical fiber is 3.46 microseconds / km. This is of great significance for high-frequency financial securities trading, telemedicine and industrial manufacturing. The nonlinear noise of hollow-core optical fiber is 3 to 4 orders of magnitude lower than that of solid-core optical fiber, which greatly increases its fiber input optical power. For example, in the experiment, ultra-high-speed real-time transmission of single-wave 5W fiber input power on 200 meters of anti-resonant hollow-core optical fiber was achieved, which is more than 17dB higher than the maximum fiber input power of the current solid-core optical communication system. The attenuation coefficient of hollow-core optical fiber is one order of magnitude lower than that of solid-core optical fiber, and theoretically can reach less than 0.1dB / km. This helps to increase the length of the optical amplifier section for long-distance communication by several times under the same communication capacity, and reduce the number of optical amplifier stations; the low attenuation bandwidth of hollow-core optical fiber can exceed 1000nm, which is more than 5 times that of solid-core optical fiber. This makes hollow-core optical fiber have a larger transmission capacity and a longer transmission distance in optical communication; the back Rayleigh scattering intensity of hollow-core optical fiber is more than 1000 times lower than that of solid-core optical fiber, which is suitable for single-core bidirectional transmission; the dispersion coefficient of hollow-core optical fiber is low, which enables it to meet the long-distance and high-speed transmission requirements in incoherent systems. In other words, the many advantages of hollow-core optical fiber provide a new solution for high-speed communication.

[0045] From the perspective of application in the communication field, hollow-core optical fiber has great advantages in performance compared with the currently widely used glass-core optical fiber, but since solid-core optical fiber is still the mainstream in the market, how to switch hollow-core optical fiber with solid-core optical fiber in landing applications is a big problem. Because the mode field diameter of solid optical fiber is about 9um, while the mode field diameter of hollow optical fiber is above 20um, it is obvious that the mode field diameter of solid optical fiber does not match the mode field diameter of hollow optical fiber. If the two are directly connected, it will cause loss of optical path.

[0046] For this purpose, see Figure 1 and Figure 2A hollow-core fiber mode field conversion adapter is provided in a first aspect of an embodiment of the present application. The hollow-core fiber mode field conversion adapter is used for connecting a hollow-core fiber to a solid-core fiber, wherein the hollow-core fiber mode field conversion adapter comprises an adapter housing 1 and an optical path converter 2. Both ends of the adapter housing 1 are provided with inner cavities (not shown in the figure), and the optical path converter 2 is embedded in the inner cavity. One end of the optical path converter 2 is used to connect with a hollow-core fiber connector 3 through the inner cavity, and the other end of the optical path converter 2 is used to connect with a solid-core fiber connector 4 through the inner cavity. The optical path of the hollow-core fiber in the hollow-core fiber connector 3 is connected with the optical path of the solid fiber of the solid-core fiber connector 4 through the optical path converter 2.

[0047] That is to say, in this embodiment, by having an optical path converter 2 built into the adapter housing 1, the hollow-core fiber connector 3 and the solid-core fiber connector 4 can be connected to the two ends of the optical path converter 2 through the inner cavity respectively, so that the optical path of the hollow-core fiber in the hollow-core fiber connector 3 and the optical path of the solid fiber in the solid-core fiber connector 4 can be connected through the optical path converter 2, so that the optical path of the hollow-core fiber matches the optical path of the solid fiber, thereby reducing the loss of the optical path connection between the two.

[0048] Optionally, in one embodiment, the material of the adapter housing 1 is the same as that of a conventional optical fiber mode field conversion adapter.

[0049] Optionally, in one embodiment, the optical path converter 2 is a convex lens or a lens group. It is worth noting that in this embodiment, a convex lens or a lens group is built into the adapter housing 1 to achieve the connection of the optical path through the conversion of the convex lens or the lens group.

[0050] Optional, see Figure 3 and Figure 4 In one embodiment, a first positioning hole (not shown in the figure) and a second positioning hole (not shown in the figure) are respectively provided at both ends of the optical path converter 2, the first positioning hole is used to install the first core 31 of the hollow fiber connector 3, and the second positioning hole is used to install the second core 41 of the solid fiber connector 4.

[0051] By providing the first positioning hole and the second positioning hole, the present embodiment can perform coupling and limiting when the first ferrule 31 of the hollow-core fiber connector 3 and the second ferrule 41 of the solid-core fiber connector 4 are respectively inserted into the two ends of the optical path converter 2, so that the insertion positions of the first ferrule 31 and the second ferrule 41 can be kept consistent each time they are inserted into the optical path converter 2, thereby ensuring the stability of the optical path connection between the optical path converter 2 and the optical path of the hollow-core fiber of the hollow-core fiber connector 3 and the optical path of the solid-core fiber of the solid-core fiber connector 4.

[0052] Optional, see Figure 1 and Figure 2 In another embodiment, a third positioning hole (not shown in the figure) and a fourth positioning hole (not shown in the figure) are respectively provided at both ends of the optical path converter 2, and the hollow-core fiber mode field conversion adapter also includes a first limiting sleeve 5 and a second limiting sleeve 6, the first limiting sleeve 5 is embedded in the third positioning hole, and is used to install the first ferrule 31 of the hollow-core fiber connector 3, the first limiting sleeve 5 is penetrated by a first through hole 511, and the optical path of the hollow-core fiber of the hollow-core fiber connector 3 is injected into the optical path converter 2 through the first through hole 511 for collimation, the second limiting sleeve 6 is embedded in the fourth positioning hole, and is used to install the second ferrule 41 of the solid-core fiber connector 4, the second limiting sleeve 6 is penetrated by a second through hole 611, and the optical path passing through the optical path converter 2 is connected with the optical path of the solid-core fiber of the solid-core fiber connector 4 through the second through hole 611.

[0053] By providing the first limiting sleeve 5 and the second limiting sleeve 6, the present embodiment can avoid the first ferrule 31 of the hollow-core fiber connector 3 and the second ferrule 41 of the solid-core fiber connector 4 from being directly connected to the optical path converter 2, so as to avoid the connection wear of the hollow-core fiber connector 3 and the solid-core fiber connector 4 on the optical path converter 2. In addition, by providing the first limiting sleeve 5 and the second limiting sleeve 6, the first ferrule 31 of the hollow-core fiber connector 3 and the second ferrule 41 of the solid-core fiber connector 4 can be coupled and limited when they are respectively inserted into the two ends of the first limiting sleeve 5 and the second limiting sleeve 6, so that the insertion positions of the first ferrule 31 and the second ferrule 41 can be kept consistent each time they are inserted into the optical path converter 2 through the first limiting sleeve 5 and the second limiting sleeve 6, thereby ensuring the stability of the optical path connection between the optical path converter 2 and the optical path of the hollow-core fiber of the hollow-core fiber connector 3 and the optical path of the solid-core fiber of the solid-core fiber connector 4.

[0054] Optional, see Figure 1 and Figure 2 In one embodiment, the first limiting sleeve 5 includes a first limiting sleeve shell 51 and a first limiting through-core 52, the first limiting sleeve shell 51 is embedded in the third positioning hole, the first through-hole 511 is opened on one end of the first limiting sleeve shell 51 close to the optical path converter 2, the first limiting through-core 52 is embedded in the first limiting sleeve shell 51, and is used to install the first ferrule 31 of the hollow fiber connector 3.

[0055] By configuring the first limiting sleeve 5 to be a connection between a first limiting sleeve shell 51 and a first limiting through-core 52, compared to the first limiting sleeve 5 made of only one material, the present embodiment can use different materials for the first limiting sleeve shell 51 and the first limiting through-core 52, thereby not only ensuring the connection stability between the first limiting sleeve shell 51 and the optical path converter 2, but also ensuring that the first limiting through-core 52 will not be too rigidly connected to the first ferrule 31 of the hollow-core optical fiber connector 3, thereby damaging the hollow-core optical fiber connector 3.

[0056] The first limiting sleeve 5 can be configured as a metal limiting sleeve, and the first limiting through-core 52 can be configured as a ceramic limiting through-core.

[0057] Optional, see Figure 1 and Figure 2 In one embodiment, the second limiting sleeve 6 includes a second limiting sleeve shell 61 and a second limiting through-core 62. The second limiting sleeve shell 61 is embedded in the fourth positioning hole. The second through-hole 611 is opened on one end of the second limiting sleeve shell 61 close to the optical path converter 2. The second limiting through-core 62 is embedded in the second limiting sleeve shell 61 and is used to install the second ferrule 41 of the solid optical fiber connector 4.

[0058] In this embodiment, by configuring the second limiting sleeve 6 to be a connection between a second limiting sleeve shell 61 and a second limiting through-core 62, compared to a second limiting sleeve 6 made of only one material, this embodiment can use different materials for the second limiting sleeve shell 61 and the second limiting through-core 62, thereby not only ensuring the stability of the connection between the second limiting sleeve shell 61 and the optical path converter 2, but also ensuring that the second limiting through-core 62 will not be too rigidly connected to the second ferrule 41 of the solid optical fiber connector 4, thereby damaging the solid optical fiber connector 4.

[0059] The second limiting sleeve shell 61 can be set as a metal limiting sleeve, and the second limiting through-core 62 can be set as a ceramic limiting through-core.

[0060] Optionally, in one embodiment, the hollow-core fiber mode field conversion adapter further includes a marking portion (not shown in the figure), which can be provided on the end of the adapter housing 1 located at the optical path converter 2 for connecting with the hollow-core fiber connector 3. In this embodiment, by providing a marking portion on the end of the adapter housing 1 located at the optical path converter 2 for connecting with the hollow-core fiber connector 3, it is convenient for users to quickly identify the connection end of the hollow-core fiber connector 3, thereby realizing a quick connection between the hollow-core fiber connector 3 and the hollow-core fiber mode field conversion adapter.

[0061] Optionally, in another embodiment, of course, the marking portion of this embodiment can also be provided on the end of the adapter housing 1 located at the optical path converter 2 for connecting with the solid optical fiber connector 4. This embodiment provides a marking portion on the end of the adapter housing 1 located at the optical path converter 2 for connecting with the solid optical fiber connector 4, so that users can quickly identify the connection end of the solid optical fiber connector 4, thereby realizing the rapid connection between the solid optical fiber connector 4 and the hollow optical fiber mode field conversion adapter.

[0062] Optionally, in yet another embodiment, corresponding marking portions may be provided on one end of the adapter housing 1 where the optical path converter 2 is located and used to connect with the hollow-core fiber connector 3, and on one end of the adapter housing 1 where the optical path converter 2 is located and used to connect with the solid-core fiber connector 4, so as to facilitate users to quickly identify the connection ends of the hollow-core fiber connector 3 and the solid-core fiber connector 4 at the hollow-core fiber mode field conversion adapter, respectively, and thereby achieve quick connection of the hollow-core fiber connector 3 and the solid-core fiber connector 4 with the hollow-core fiber mode field conversion adapter, respectively.

[0063] Optionally, in one embodiment, the marking portion may be configured as an opened marking groove.

[0064] See and Figure 5 The second aspect of the embodiment of the present application provides a method for processing a hollow-core optical fiber mode field conversion adapter, which is applied to the hollow-core optical fiber mode field conversion adapter as described above, and the processing method includes:

[0065] S10, providing an adapter housing, wherein both ends of the adapter housing are provided with inner cavities;

[0066] S10. Provide an optical path converter, and embed the optical path converter into the inner cavity of the adapter housing to obtain a hollow fiber mode field conversion adapter.

[0067] Optionally, in one embodiment, an optical path converter is provided and built into the inner cavity of the adapter housing. In the step of obtaining a hollow fiber mode field conversion adapter, a first positioning hole and a second positioning hole are respectively provided at both ends of the optical path converter, and the first positioning hole is used to install the first core of the hollow fiber connector, and the second positioning hole is used to install the second core of the solid fiber connector.

[0068] Optionally, in one embodiment, an optical path converter is provided and built into the inner cavity of the adapter housing, and in the step of obtaining a hollow fiber mode field conversion adapter, a third positioning hole and a fourth positioning hole are respectively provided at both ends of the optical path converter, and a first limiting sleeve is embedded in the third positioning hole, and the first limiting sleeve is used to install the first ferrule of the hollow fiber connector, and a first through hole is penetrated by the first limiting sleeve; a second limiting sleeve is embedded in the fourth positioning hole, and the second limiting sleeve is used to install the second ferrule of the solid fiber connector, and a second through hole is penetrated by the second limiting sleeve.

[0069] In summary, the present application provides a hollow-core fiber mode field conversion adapter and a processing method thereof, including an adapter housing and an optical path converter, wherein both ends of the adapter housing are provided with inner cavities, the optical path converter is embedded in the inner cavity, one end of the optical path converter is used to connect with a hollow-core fiber connector through the inner cavity, and the other end of the optical path converter is used to connect with a solid-core fiber connector through the inner cavity, and the optical path of the hollow-core fiber in the hollow-core fiber connector is connected with the optical path of the solid-core fiber of the solid-core fiber connector through the optical path converter. In other words, the present application can connect the hollow-core fiber connector and the solid-core fiber connector to the two ends of the optical path converter through the inner cavity respectively by building an optical path converter in the adapter housing, so as to connect the optical path of the hollow-core fiber in the hollow-core fiber connector with the optical path of the solid fiber in the solid-core fiber connector through the optical path converter, so as to match the optical path of the hollow-core fiber with the optical path of the solid fiber, thereby reducing the loss of the optical path connection between the two.

[0070] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hollow-core optical fiber mode field conversion adapter, characterized in that: include: The adapter housing has inner cavities extending through both ends thereof; An optical path converter, which is embedded in the inner cavity, one end of the optical path converter is used to connect with a hollow optical fiber connector through the inner cavity, and the other end of the optical path converter is used to connect with a solid optical fiber connector through the inner cavity; The optical path of the hollow optical fiber in the hollow optical fiber connector is connected to the optical path of the solid optical fiber of the solid optical fiber connector through the optical path converter.

2. The hollow-core optical fiber mode field conversion adapter according to claim 1, characterized in that: The optical path converter is a convex lens or a lens group.

3. The hollow-core optical fiber mode field conversion adapter according to claim 1, characterized in that: The optical path converter has a first positioning hole and a second positioning hole at both ends thereof, wherein the first positioning hole is used to install the first ferrule of the hollow optical fiber connector, and the second positioning hole is used to install the second ferrule of the solid optical fiber connector.

4. The hollow-core optical fiber mode field conversion adapter according to claim 1, characterized in that: The two ends of the optical path converter are respectively provided with a third positioning hole and a fourth positioning hole, and the hollow-core optical fiber mode field conversion adapter further comprises: A first limiting sleeve, which is embedded in the third positioning hole and used to install the first ferrule of the hollow-core optical fiber connector, the first limiting sleeve is penetrated by a first through hole, and the optical path of the hollow-core optical fiber of the hollow-core optical fiber connector is injected into the optical path converter through the first through hole; A second limiting sleeve is embedded in the fourth positioning hole and is used to install the second ferrule of the solid optical fiber connector. The second limiting sleeve is penetrated by a second through hole, and the light path through the optical path converter is connected with the light path of the solid optical fiber of the solid optical fiber connector through the second through hole.

5. The hollow-core optical fiber mode field conversion adapter according to claim 4, characterized in that: The first limiting sleeve comprises: A first limiting sleeve, which is embedded in the third positioning hole, and the first through hole is opened on an end of the first limiting sleeve close to the optical path converter; The first limiting penetrating core is embedded in the first limiting sleeve and is used for installing the first insert core of the hollow optical fiber connector.

6. The hollow-core optical fiber mode field conversion adapter according to claim 4, characterized in that: The second limiting sleeve comprises: A second limiting sleeve is embedded in the fourth positioning hole, and the second through hole is formed on an end of the second limiting sleeve close to the optical path converter; The second position-limiting through-core is embedded in the second position-limiting sleeve and is used for installing the second insert core of the solid optical fiber connector.

7. The hollow-core optical fiber mode field conversion adapter according to claim 1, characterized in that: The hollow core optical fiber mode field conversion adapter also includes: A marking portion, which is arranged on the adapter housing at one end of the optical path converter for connecting with the hollow fiber connector; Or it is arranged on the adapter housing at one end of the optical path converter for connecting with the solid optical fiber connector.

8. A method for processing a hollow-core optical fiber mode field conversion adapter, characterized in that: It is applied to the hollow-core optical fiber mode field conversion adapter according to any one of claims 1 to 7, and the processing method comprises: An adapter housing is provided, wherein two ends of the adapter housing are provided with inner cavities therethrough; An optical path converter is provided and built into the inner cavity of the adapter housing to obtain a hollow optical fiber mode field conversion adapter.

9. The method for processing a hollow-core optical fiber mode field conversion adapter according to claim 8, characterized in that: In the step of providing an optical path converter and placing the optical path converter in the inner cavity of the adapter housing to obtain a hollow fiber mode field conversion adapter, a first positioning hole and a second positioning hole are respectively provided at both ends of the optical path converter, the first positioning hole is used to install the first ferrule of the hollow fiber connector, and the second positioning hole is used to install the second ferrule of the solid fiber connector.

10. The method for processing a hollow-core optical fiber mode field conversion adapter according to claim 8, characterized in that: In the step of providing an optical path converter and placing the optical path converter in the inner cavity of the adapter housing to obtain a hollow fiber mode field conversion adapter, a third positioning hole and a fourth positioning hole are respectively provided at two ends of the optical path converter, a first limiting sleeve is embedded in the third positioning hole, the first limiting sleeve is used to install the first ferrule of the hollow fiber connector, and the first limiting sleeve is penetrated by a first through hole; a second limiting sleeve is embedded in the fourth positioning hole, the second limiting sleeve is used to install the second ferrule of the solid fiber connector, and the second limiting sleeve is penetrated by a second through hole.

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