Multi-mode optical fiber connector device based on thermal expansion core

Abstract

The invention provides a multimode optical fiber connector device based on a thermal expansion core, and relates to the technical field of optical fibers. The multi-mode optical fiber connector comprises a non-core-expanded multi-mode optical fiber core module, a thermal core-expanded multi-mode optical fiber core module, a cladding module and an outer sleeve module, and by introducing the thermal core-expanded multi-mode optical fiber core module, the mode field matching condition of the multi-mode optical fiber connector under the condition of lateral deviation is remarkably improved, the connection loss is effectively reduced, and the service life of the multi-mode optical fiber connector is prolonged. The thermal core expansion multimode optical fiber core module is the core of the optical fiber module, the module uses a thermal core expansion processing technology and a standard TEC technology to expand the diameter of the multimode optical fiber core at the connecting end, and mode field distribution is optimized; and the outer sleeve module is sleeved outside the cladding module, and a standard optical fiber connector packaging process is adopted, so that the stability is high, the durability is strong, and the economical efficiency is excellent.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber technology, and in particular to a multimode optical fiber connector device based on thermal core expansion. Background Art

[0002] With the development of autonomous driving technology, the number and resolution of in-vehicle cameras are increasing. Traditional copper cables in vehicle network backbones, due to bandwidth, transmission loss, electromagnetic interference, and cable weight, have become bottlenecks that hinder the advancement of autonomous driving technology. In recent years, research and testing of in-vehicle networks based on multimode optical fiber as the transmission medium has accelerated. Compared to copper cables, optical fiber offers advantages such as ultra-high bandwidth, ultra-low transmission loss, no electromagnetic interference, and light weight. Although optical fiber communication technology has achieved great success in applications such as data center optical interconnection, it cannot be directly applied to in-vehicle communication networks. This is because vibration is inevitable in the vehicle environment. While engine idling can cause minor vibrations, complex road conditions (such as gravel roads, bumpy roads, and potholes) and driving over speed bumps can cause significant vibrations. For in-vehicle optical fiber links, vibration can cause random coupling losses in optical connectors, resulting in random fluctuations in the optical power received by the optical receiver. Therefore, it is necessary to design a vibration-resistant multimode optical fiber connector to mitigate vibration-induced link losses. Summary of the Invention

[0003] In order to solve the problems in the above-mentioned prior art, the present invention provides a multimode optical fiber connector device based on thermal core expansion. The invention consists of an unexpanded multimode optical fiber core module, a thermal core expansion multimode optical fiber core module, a cladding module and an outer sleeve module, and clarifies that the core of the device is the thermal core expansion multimode optical fiber core module. By introducing the thermal core expansion multimode optical fiber core module, the mode field matching condition of the multimode optical fiber connector under the existence of lateral offset is significantly improved, the connection loss is effectively reduced, and the optical signal transmission performance is improved; then, a thermal core expansion processing process for the preparation of thermal core expansion multimode optical fiber core is proposed. This process uses standard TEC (Thermal Expansion Core) technology to achieve core expansion and optimize the mode field distribution; finally, the outer sleeve module is designed and packaged using a standard optical fiber connector process to ensure the stability, durability and economy of the multimode optical fiber connector. To achieve the above-mentioned purpose, the technical solution is as follows:

[0004] The present invention provides a multimode optical fiber connector device based on thermal core expansion, the device comprising:

[0005] A first unexpanded multimode optical fiber core module is used to receive an incident light beam and match the mode field diameter of the incident light beam;

[0006] a first thermally expanded multimode optical fiber core module, configured to receive the light beam transmitted by the first unexpanded multimode optical fiber core module and increase the mode field diameter of the light beam transmitted by the first unexpanded multimode optical fiber core module;

[0007] a second thermally expanded core multimode optical fiber core module, configured to receive the light beam emitted by the first thermally expanded core multimode optical fiber core module and reduce the mode field diameter of the light beam emitted by the first thermally expanded core multimode optical fiber core module;

[0008] A second unexpanded multimode optical fiber core module is used to receive the light beam transmitted by the second thermally expanded multimode optical fiber core module and match the mode field diameter of the light beam transmitted by the second thermally expanded multimode optical fiber core module;

[0009] a first cladding module, configured to confine the incident light beam within the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module, and serve as an outer cladding of the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module;

[0010] a second cladding module, configured to confine the incident light beam within the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module, and serve as an outer cladding of the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module;

[0011] a first outer sleeve module, configured to position and fix the multimode optical fiber connector device and protect the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module from stress;

[0012] The second outer sleeve module is used to position and fix the multimode optical fiber connector device and protect the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module from stress.

[0013] Optionally, the first unexpanded multimode optical fiber core module and the second unexpanded multimode optical fiber core module are multimode optical fibers with a graded refractive index profile.

[0014] Optionally, the first end of the first thermally expanded multimode optical fiber core module is connected to the second end of the first unexpanded multimode optical fiber core module; the second end of the second thermally expanded multimode optical fiber core module is connected to the first end of the second unexpanded multimode optical fiber core module; and the second end of the first thermally expanded multimode optical fiber core module is docked with the first end of the second thermally expanded multimode optical fiber core module.

[0015] Optionally, the first end diameter of the first thermally expanded core multimode fiber core module is not equal to the second end diameter of the first thermally expanded core multimode fiber core module, and the first end diameter of the second thermally expanded core multimode fiber core module is not equal to the second end diameter of the second thermally expanded core multimode fiber core module; the first end diameter of the first thermally expanded core multimode fiber core module is equal to the diameter of the first unexpanded multimode fiber core module, and the second end diameter of the first thermally expanded core multimode fiber core module is larger than the first end diameter of the first thermally expanded core multimode fiber core module; the second end diameter of the second thermally expanded core multimode fiber core module is equal to the diameter of the second unexpanded multimode fiber core module, and the first end diameter of the second thermally expanded core multimode fiber core module is larger than the second end diameter of the second thermally expanded core multimode fiber core module.

[0016] Optionally, the expansion structure from the first end of the first thermally expanded core multimode optical fiber core module to the second end of the first thermally expanded core multimode optical fiber core module includes: a linear beam expansion structure, a convex curved beam expansion structure, and a concave curved beam expansion structure;

[0017] The expansion structure from the first end of the second thermally expanded core multimode optical fiber core module to the second end of the second thermally expanded core multimode optical fiber core module includes: a linear beam expansion structure, a convex curve beam expansion structure and a concave curve beam expansion structure.

[0018] Optionally, the first thermally expanded multimode optical fiber core module is obtained by subjecting the first unexpanded multimode optical fiber core module to a thermal expansion treatment process; the second thermally expanded multimode optical fiber core module is obtained by subjecting the second unexpanded multimode optical fiber core module to a thermal expansion treatment process.

[0019] Optionally, the process of the thermal core expansion process includes:

[0020] By stripping off the coating layers of the portions requiring heating of the first unexpanded multimode optical fiber core module and the second unexpanded multimode optical fiber core module, a bare fiber having a core and cladding structure is obtained;

[0021] According to the bare fiber with a core and cladding structure, a measuring light source and an optical power meter are connected to obtain a bare fiber with a measuring device;

[0022] According to the optical power meter, the measuring light source is turned on, and the heating temperature of the bare fiber with the measuring device is adjusted to obtain a heated bare fiber;

[0023] According to the heated bare fiber, when the optical power meter reaches the design threshold, the heating is stopped and the heated bare fiber is cut at the maximum diameter to obtain the first thermally expanded core multimode optical fiber core module and the second thermally expanded core multimode optical fiber core module.

[0024] Optionally, the first outer sleeve module is coaxial with the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module;

[0025] The second outer sleeve module is coaxial with the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module;

[0026] The first outer sleeve module and the second outer sleeve module are packaged using a standard optical fiber connector process.

[0027] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0028] On the one hand, the above solution significantly improves the mode field matching of multimode optical fiber connections by using thermally expanded multimode optical fiber core modules, effectively reduces connection losses, and improves optical signal transmission performance; on the other hand, based on the thermally expanded multimode optical fiber core modules, it can better suppress the connection losses caused by fiber core misalignment caused by vibration; on the third hand, with the help of standard TEC technology, the stability, durability and economy of the connector are guaranteed, and it has the potential for large-scale promotion and application, providing strong support for the expansion and upgrading of optical communication systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a device block diagram of an embodiment of a multimode optical fiber connector device based on thermal core expansion of the present invention;

[0031] Figure 2 1 is a schematic structural diagram of an embodiment of a multimode optical fiber connector device based on thermal core expansion according to the present invention;

[0032] Figure 3 1 is a schematic diagram of an expanded structure of a thermal core expansion multimode optical fiber core module of an embodiment of a thermal core expansion multimode optical fiber connector device according to the present invention;

[0033] Figure 4 The present invention is a flowchart of a thermal core expansion process for a multimode optical fiber connector device based on thermal core expansion according to an embodiment of the present invention.

[0034] Explanation of the numbers in the figure: first unexpanded multimode optical fiber core module 1, first thermally expanded multimode optical fiber core module 2, second thermally expanded multimode optical fiber core module 3, second unexpanded multimode optical fiber core module 4, first cladding module 5, second cladding module 6, first outer sleeve module 7, second outer sleeve module 8. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0036] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as an "exemplary" in the present invention should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner. Furthermore, in the embodiments of the present invention, "and / or" can mean both or either of the two.

[0037] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 The device block diagram of the embodiment of the multimode optical fiber connector device based on thermal core expansion of the present invention is shown in FIG. Figure 2 The structure diagram of an embodiment of a multimode optical fiber connector device based on thermal core expansion of the present invention is shown. The present invention provides a multimode optical fiber connector device based on thermal core expansion, which includes: a first unexpanded multimode optical fiber core module 1, a first thermally expanded multimode optical fiber core module 2, a second thermally expanded multimode optical fiber core module 3, a second unexpanded multimode optical fiber core module 4, a first cladding module 5, a second cladding module 6, a first outer sleeve module 7, and a second outer sleeve module 8;

[0039] A first unexpanded multimode optical fiber core module 1 is used to receive an incident light beam and match the mode field diameter of the incident light beam;

[0040] a first thermally expanded multimode optical fiber core module 2, configured to receive the light beam transmitted by the first unexpanded multimode optical fiber core module 1 and increase the mode field diameter of the light beam transmitted by the first unexpanded multimode optical fiber core module 1;

[0041] The second thermally expanded multimode optical fiber core module 3 is configured to receive the light beam emitted by the first thermally expanded multimode optical fiber core module 2 and reduce the mode field diameter of the light beam emitted by the first thermally expanded multimode optical fiber core module 2;

[0042] The second unexpanded multimode optical fiber core module 4 is used to receive the light beam transmitted by the second thermally expanded multimode optical fiber core module 3 and match the mode field diameter of the light beam transmitted by the second thermally expanded multimode optical fiber core module 3;

[0043] Specifically, the first unexpanded multimode optical fiber core module 1 and the second unexpanded multimode optical fiber core module 4 are multimode optical fibers with a graded refractive index distribution.

[0044] Furthermore, the core diameters of the first unexpanded multimode optical fiber core module 1 and the second unexpanded multimode optical fiber core module 4 are 17 , the relative refractive index difference between the core axis and the cladding is 1%. The multimode fiber with graded refractive index profile supports LP 01 , LP 11a , LP 11b ,LP 21a , LP 21b and LP 02 Six LP modes.

[0045] Specifically, the first end of the first thermally expanded multimode optical fiber core module 2 is connected to the second end of the first unexpanded multimode optical fiber core module 1; the second end of the second thermally expanded multimode optical fiber core module 3 is connected to the first end of the second unexpanded multimode optical fiber core module 4; the second end of the first thermally expanded multimode optical fiber core module 2 is connected to the first end of the second thermally expanded multimode optical fiber core module 3.

[0046] Specifically, the first end diameter of the first thermally expanded core multimode optical fiber core module 2 is not equal to the second end diameter of the first thermally expanded core multimode optical fiber core module 2, and the first end diameter of the second thermally expanded core multimode optical fiber core module 3 is not equal to the second end diameter of the second thermally expanded core multimode optical fiber core module 3; the first end diameter of the first thermally expanded core multimode optical fiber core module 2 is equal to the diameter of the first unexpanded multimode optical fiber core module 1, and the second end diameter of the first thermally expanded core multimode optical fiber core module 2 is 2 to 3 times the first end diameter of the first thermally expanded core multimode optical fiber core module 2; the second end diameter of the second thermally expanded core multimode optical fiber core module 3 is equal to the diameter of the second unexpanded multimode optical fiber core module 4, and the first end diameter of the second thermally expanded core multimode optical fiber core module 3 is 2 to 3 times the second end diameter of the second thermally expanded core multimode optical fiber core module 3.

[0047] Furthermore, the lengths of the first thermally expanded core multimode optical fiber core module 2 and the second thermally expanded core multimode optical fiber core module 3 are both between 1000 and 2000 μm, the lengths of the first thermally expanded core multimode optical fiber core module 2 and the second thermally expanded core multimode optical fiber core module 3 are 1000 μm, and the second end diameter of the first thermally expanded core multimode optical fiber core module 2 and the first end diameter of the second thermally expanded core multimode optical fiber core module 3 are 50 μm.

[0048] Specifically, if Figure 3 The schematic diagram of the expansion structure of the thermal expansion multimode optical fiber core module of the embodiment of the multimode optical fiber connector device based on thermal expansion of the present invention is shown. The expansion structure from the first end of the first thermal expansion multimode optical fiber core module 2 to the second end of the first thermal expansion multimode optical fiber core module 2 includes: a linear beam expansion structure, a convex curved beam expansion structure, and a concave curved beam expansion structure;

[0049] The expansion structure from the first end of the second thermally expanded core multimode optical fiber core module 3 to the second end of the second thermally expanded core multimode optical fiber core module 3 includes: a linear beam expansion structure, a convex curved beam expansion structure and a concave curved beam expansion structure.

[0050] Specifically, the first thermally expanded multimode optical fiber core module 2 is obtained by subjecting the first unexpanded multimode optical fiber core module 1 to a thermal expansion treatment process; the second thermally expanded multimode optical fiber core module 3 is obtained by subjecting the second unexpanded multimode optical fiber core module 4 to a thermal expansion treatment process.

[0051] Further, if Figure 4 The flowchart of the thermal core expansion process of the embodiment of the multimode optical fiber connector device based on thermal core expansion of the present invention is shown. The process of the thermal core expansion process includes:

[0052] By stripping off the coating layers of the portions that need to be heated of the first unexpanded multimode optical fiber core module 1 and the second unexpanded multimode optical fiber core module 4, a bare fiber having a core and cladding structure is obtained;

[0053] According to the bare fiber with a core and cladding structure, a measuring light source and an optical power meter are connected to obtain a bare fiber with a measuring device;

[0054] According to the optical power meter, the measuring light source is turned on, and the heating temperature of the bare fiber with the measuring device is adjusted to obtain a heated bare fiber;

[0055] According to the heated bare fiber, when the optical power meter reaches the design threshold, the heating is stopped and the heated bare fiber is cut at the maximum diameter to obtain the first thermally expanded core multimode optical fiber core module 2 and the second thermally expanded core multimode optical fiber core module 3.

[0056] Furthermore, the specific process of the thermal core expansion process is as follows:

[0057] Strip off the protective coating layer of the multimode optical fiber that needs to be heated to expose the bare fiber containing only the core and cladding structure;

[0058] Keep the bare fiber straight and connect a light source and an optical power meter to both ends of the multimode fiber. Place the CO2 laser directly below the bare fiber and adjust the CO2 laser so that the laser beam it emits is directed directly at the bare fiber.

[0059] The CO2 laser is turned on to heat the bare fiber. The output power of the CO2 laser is continuously adjusted according to the optical power meter to ensure that the heating temperature is within the range of 1200-1700 degrees Celsius. The output optical power is measured by the optical power meter. When the required output power is reached, the heating is stopped.

[0060] The bare fiber is cut along the portion where the core diameter of the bare fiber is the largest after heating to obtain the first thermally expanded core multimode optical fiber core module 2 and the second thermally expanded core multimode optical fiber core module 3 with large flat ends.

[0061] A first cladding module 5 is used to confine the incident light beam within the first unexpanded multimode optical fiber core module 1 and the first thermally expanded multimode optical fiber core module 2, and serve as an outer cladding of the first unexpanded multimode optical fiber core module 1 and the first thermally expanded multimode optical fiber core module 2;

[0062] A second cladding module 6 is used to confine the incident light beam within the second unexpanded multimode optical fiber core module 4 and the second thermally expanded multimode optical fiber core module 3, and serve as an outer cladding of the second unexpanded multimode optical fiber core module 4 and the second thermally expanded multimode optical fiber core module 3;

[0063] A first outer sleeve module 7 is used to position and fix the multimode optical fiber connector device and protect the first unexpanded multimode optical fiber core module 1 and the first thermally expanded multimode optical fiber core module 2 from stress;

[0064] The second outer sleeve module 8 is used to position and fix the multimode optical fiber connector device and protect the second unexpanded multimode optical fiber core module 4 and the second thermally expanded multimode optical fiber core module 3 from stress.

[0065] Specifically, the first outer sleeve module 7 is coaxial with the first unexpanded multimode optical fiber core module 1 and the first thermally expanded multimode optical fiber core module 2;

[0066] The second outer sleeve module 8 is coaxial with the second unexpanded multimode optical fiber core module 4 and the second thermally expanded multimode optical fiber core module 3;

[0067] The first outer sleeve module 7 and the second outer sleeve module 8 are packaged using a standard optical fiber connector process.

[0068] A comparison experiment was conducted on the incident light beams passing through the multimode optical fiber connector device and those not passing through the multimode optical fiber connector device, and the following results were obtained:

[0069] The horizontal offset is 8 At 1550 LP 01 When the mode light beam enters the optical fiber core, the loss of the multimode optical fiber connector structure based on thermal core expansion proposed in this embodiment is reduced by 49.3% compared with the case where the multimode optical fiber connector device is not used.

[0070] The horizontal offset is 8 At 1550 LP 11b When the mode light beam enters the optical fiber core, the loss of the multimode optical fiber connector structure based on thermal core expansion proposed in this embodiment is reduced by 55.6% compared with the case where the light beam does not pass through the multimode optical fiber connector device.

[0071] The present invention provides a multimode optical fiber connector device based on thermal core expansion. The invention first introduces the overall structure of the device: an unexpanded multimode optical fiber core module, a thermal core expansion multimode optical fiber core module, a cladding module and an outer sleeve module, and clarifies that the core of the device is the thermal core expansion multimode optical fiber core module. By introducing this module, the mode field matching condition of the multimode optical fiber connector is significantly improved, the connection loss is effectively reduced, and the optical signal transmission performance is improved; then, a thermal core expansion processing process for preparing the thermal core expansion multimode optical fiber core is proposed. This process uses standard TEC technology to achieve core expansion and optimize the mode field distribution; finally, the outer sleeve module is designed and packaged using a standard optical fiber connector process to ensure the stability, durability and economy of the multimode optical fiber connector.

[0072] It will be appreciated that the present invention is described by way of the above embodiments and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. It will be appreciated by those skilled in the art that various changes or equivalent replacements may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application fall within the scope protected by the present invention.

Claims

1. A multimode optical fiber connector device based on thermal core expansion, characterized in that: The device comprises: A first unexpanded multimode optical fiber core module is used to receive an incident light beam and match the mode field diameter of the incident light beam; a first thermally expanded multimode optical fiber core module, configured to receive the light beam transmitted by the first unexpanded multimode optical fiber core module and increase the mode field diameter of the light beam transmitted by the first unexpanded multimode optical fiber core module; a second thermally expanded multimode optical fiber core module, configured to receive the light beam emitted by the first thermally expanded multimode optical fiber core module and reduce the mode field diameter of the light beam emitted by the first thermally expanded multimode optical fiber core module; a second unexpanded multimode optical fiber core module, configured to receive the light beam transmitted by the second thermally expanded multimode optical fiber core module and match the mode field diameter of the light beam transmitted by the second thermally expanded multimode optical fiber core module; a first cladding module, configured to confine the incident light beam within the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module, and serve as an outer cladding of the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module; a second cladding module, configured to confine the incident light beam within the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module, and serve as an outer cladding of the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module; a first outer sleeve module, configured to position and fix the multimode optical fiber connector device and protect the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module from stress; The second outer sleeve module is used to position and fix the multimode optical fiber connector device and protect the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module from stress.

2. The multimode optical fiber connector device based on thermal core expansion according to claim 1, characterized in that: The first unexpanded multimode optical fiber core module and the second unexpanded multimode optical fiber core module are multimode optical fibers with a graded refractive index profile.

3. The multimode optical fiber connector device based on thermal core expansion according to claim 1, characterized in that: The first end of the first thermally expanded multimode optical fiber core module is connected to the second end of the first unexpanded multimode optical fiber core module; the second end of the second thermally expanded multimode optical fiber core module is connected to the first end of the second unexpanded multimode optical fiber core module; the second end of the first thermally expanded multimode optical fiber core module is butt-jointed to the first end of the second thermally expanded multimode optical fiber core module.

4. The multimode optical fiber connector device based on thermal core expansion according to claim 3, characterized in that: The first end diameter of the first thermally expanded core multimode optical fiber core module is not equal to the second end diameter of the first thermally expanded core multimode optical fiber core module, and the first end diameter of the second thermally expanded core multimode optical fiber core module is not equal to the second end diameter of the second thermally expanded core multimode optical fiber core module; the first end diameter of the first thermally expanded core multimode optical fiber core module is equal to the diameter of the first unexpanded multimode optical fiber core module, and the second end diameter of the first thermally expanded core multimode optical fiber core module is larger than the first end diameter of the first thermally expanded core multimode optical fiber core module; the second end diameter of the second thermally expanded core multimode optical fiber core module is equal to the diameter of the second unexpanded multimode optical fiber core module, and the first end diameter of the second thermally expanded core multimode optical fiber core module is larger than the second end diameter of the second thermally expanded core multimode optical fiber core module.

5. The multimode optical fiber connector device based on thermal core expansion according to claim 3, characterized in that: The expansion structure from the first end of the first thermally expanded core multimode optical fiber core module to the second end of the first thermally expanded core multimode optical fiber core module includes: a linear beam expansion structure, a convex curved beam expansion structure, and a concave curved beam expansion structure; The expansion structure from the first end of the second thermally expanded core multimode optical fiber core module to the second end of the second thermally expanded core multimode optical fiber core module includes: a linear beam expansion structure, a convex curved beam expansion structure and a concave curved beam expansion structure.

6. The multimode optical fiber connector device based on thermal core expansion according to claim 1, characterized in that: The first thermally expanded multimode optical fiber core module is obtained by subjecting the first unexpanded multimode optical fiber core module to a thermal expansion process; The second thermally expanded multimode optical fiber core module is obtained by subjecting the second unexpanded multimode optical fiber core module to a thermal expansion process.

7. The multimode optical fiber connector device based on thermal core expansion according to claim 6, characterized in that: The process of the thermal core expansion process includes: obtaining a bare fiber having a core and cladding structure by stripping off the coating layers of the first unexpanded multimode optical fiber core module and the second unexpanded multimode optical fiber core module at the portion requiring heating; According to the bare fiber with a core and cladding structure, a measuring light source and an optical power meter are connected to obtain a bare fiber with a measuring device; According to the optical power meter, turning on the measuring light source, adjusting the heating temperature of the bare fiber with the measuring device, and obtaining a heated bare fiber; According to the heated bare fiber, when the optical power meter reaches a design threshold, heating is stopped and the heated bare fiber is cut at the maximum diameter to obtain the first thermally expanded core multimode optical fiber core module and the second thermally expanded core multimode optical fiber core module.

8. The multimode optical fiber connector device based on thermal core expansion according to claim 1, characterized in that: The first outer sleeve module is coaxial with the first unexpanded multimode optical fiber core module and the first thermally expanded multimode optical fiber core module; The second outer sleeve module is coaxial with the second unexpanded multimode optical fiber core module and the second thermally expanded multimode optical fiber core module; The first outer sleeve module and the second outer sleeve module are packaged using a standard optical fiber connector process.

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