WO2020168794A1

WO2020168794A1 - Optical fiber connector and fabrication method therefor

Info

Publication number: WO2020168794A1
Application number: PCT/CN2019/125261
Authority: WO
Inventors: 陈辉; 刘文俊; 梁凉; 闵玉岚; 叶阳; 汤风帆; 吴晓平; 刘成露
Original assignee: 武汉光迅科技股份有限公司
Priority date: 2019-02-21
Filing date: 2019-12-13
Publication date: 2020-08-27
Also published as: CN109633824B; CN109633824A

Abstract

An optical fiber connector, comprising a transmission optical fiber (1). A coating layer (2) is arranged on the coupling end face of the optical fiber connector, and a slot (3) is formed in the first side and/or the second side of the coating layer (2); the projection of the transmission optical fiber (1) on the coupling end face of the optical fiber connector falls into the coating layer (2). The slot (3) is formed in the coupling end face of the optical fiber connector; an optical signal which is incident on a light-passing face enters into the transmission optical fiber (1), and the optical signal which is directed to the slot (3) is dissipated into the air by means of the slot (3), which reduces the reflection of the endface. Therefore, the optical fiber connector may withstand higher optical power and temperature, thereby improving the performance thereof. Meanwhile, the optical fiber connector has the advantages of low cost and miniaturization.

Description

Optical fiber connector and manufacturing method thereof

Technical field

The present invention belongs to the field of optical communication, and more specifically, relates to an optical fiber connector and a manufacturing method thereof.

Background technique

In the field of optical communications, optical chips mainly output optical signals through optical fiber connectors, which include single-channel, multi-channel, and array forms. Various functions such as fiber connection, waveguide and fiber connection, and fiber extension can be realized through fiber optic connectors. The length of the fiber ranges from a few centimeters to tens of meters. Inside the optical device module, it needs to be packaged with the fiber connector.

At present, single-channel optical fiber connectors are mainly used for the common end of optical module devices. After the optical waveguide is coupled, when the power (energy) of the optical signal passing through the common end is too large, the single-channel optical fiber connector will suffer from end-face burn damage and high power. Conditions such as performance degradation have caused the performance of the optical fiber connector to fail to meet the requirements.

There is a solution to solve the aforementioned problems caused by excessive optical signal power by increasing the size of the contact surface and the diameter of the optical fiber. However, this solution will cause the overall size of the optical fiber connector and the optical device module to be too large, which cannot meet the product size. The demand for globalization limits the applicable scenarios of the product, and the customized fiber diameter will greatly increase the cost.

In view of this, overcoming the defects of the prior art is a problem to be solved in the technical field.

Summary of the invention

In view of the above defects or improvement needs of the prior art, the present invention provides an optical fiber connector and a manufacturing method thereof. The purpose of the present invention is that the coupling end surface of the optical fiber connector of the present invention is provided with a slot, and the light directed to the light passing surface is provided with a slot. The signal enters the transmission fiber, and the optical signal directed to the slot is dissipated into the air through the slot, which reduces the end surface reflection, so that the optical fiber connector can withstand higher optical power and temperature, and improves the performance of the optical fiber connector. This solves the technical problems of end face burnout and high-power performance degradation of the optical fiber connector caused by excessive power.

To achieve the above objective, according to one aspect of the present invention, an optical fiber connector is provided, the optical fiber connector includes a transmission optical fiber 1;

A coating layer 2 is provided on the coupling end surface of the optical fiber connector, and a slot 3 is provided on the first side and/or the second side of the coating layer 2;

The projection of the transmission optical fiber 1 on the coupling end surface of the optical fiber connector falls into the coating layer 2.

Preferably, the optical fiber connector includes a first substrate 41 and a second substrate 42, and the transmission optical fiber 1 is arranged between the first substrate 41 and the second substrate 42;

The coating layer 2 is arranged on the side surfaces of the first substrate 41 and the second substrate 42;

The slot 3 penetrates the first substrate 41 and/or the second substrate 42.

Preferably, the optical fiber connector further includes at least one auxiliary optical fiber 5, the auxiliary optical fiber 5 is arranged on the first substrate 41, and the auxiliary optical fiber 5 is arranged in other areas except the coating layer 2;

The auxiliary optical fiber 5 and the transmission optical fiber 1 cooperate with each other so that the gap between the first substrate 41 and the second substrate 42 is kept consistent.

Preferably, a plurality of optical fiber receiving grooves 6 are provided on the first substrate 41, and the optical fiber receiving grooves 6 are used for receiving the transmission optical fiber 1 and the auxiliary optical fiber 5 respectively.

Preferably, the shape of the slot 3 is at least one of a rectangular groove, a square groove, a V-shaped groove or a U-shaped groove.

Preferably, the width of the coating layer 2 is 195 μm±10 μm, the width of the groove 3 is 200 μm to 800 μm, and the depth of the groove 3 is 300 μm to 900 μm.

Preferably, an anti-reflection film is provided on the coating layer 2, and the remaining reflectivity of the anti-reflection film is less than 0.2%.

According to another aspect of the present invention, there is provided a manufacturing method of an optical fiber connector, the manufacturing method comprising:

Prepare the transmission optical fiber 1, which is arranged between the first substrate 41 and the second substrate 42;

Cutting the first substrate 41 and the second substrate 42 on the first side and/or the second side of the transmission optical fiber 1 to form a slot 3;

Coating the side surfaces of the first substrate 41 and the second substrate 42 to form a coating layer 2, wherein the projection of the transmission fiber 1 on the coupling end surface of the optical fiber connector falls into the coating layer 2.

Preferably, the preparation of the transmission optical fiber 1 and arranging the transmission optical fiber 1 on the first substrate 41 and the second substrate 42 include:

Prepare the transmission optical fiber 1 and the auxiliary optical fiber 5, and arrange the transmission optical fiber 1 and the auxiliary optical fiber 5 on the first substrate 41 and the second substrate 42;

The relative positions of the first substrate 41 and the second substrate 42 are adjusted so that the staggered distance between the first substrate 41 and the second substrate 42 is smaller than a preset value.

Preferably, coating the side surfaces of the first substrate 41 and the second substrate 42 to form the coating layer 2 includes:

Shield the side surfaces of the first substrate 41 and the second substrate 42 corresponding to the auxiliary optical fiber 5;

The side surfaces of the first substrate 41 and the second substrate 42 corresponding to the transmission optical fiber 1 are coated to form a coating layer 2.

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention have the following beneficial effects: the optical fiber connector of the present invention includes a transmission optical fiber, and the coupling end surface of the optical fiber connector is provided with a coating layer. The first side and/or the second side are provided with slots, and the projection of the end face of the transmission fiber on the coupling end face of the optical fiber connector falls into the coating layer. The coupling end surface of the optical fiber connector of the present invention is provided with a slot, the optical signal directed to the light-passing surface enters the transmission fiber, and the optical signal directed to the slot is mainly radiated into the air through the slot, which reduces the end surface reflection , So that the optical fiber connector can withstand higher optical power and temperature, and improve the performance of the optical fiber connector. At the same time, compared with the prior art, the optical fiber connector of the present invention does not change the packaging size of the optical fiber connector, and does not need to customize an optical fiber with a special diameter, has the advantages of low cost and miniaturization, and broadens the application scenarios of the product.

Furthermore, an anti-reflection coating is provided on the coating layer, which not only transmits the optical signal through the transmission fiber to a large extent, but also can further reduce the end surface reflection.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following will briefly introduce the drawings that need to be used in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a first optical fiber connector provided by an embodiment of the present invention;

2 is a schematic structural diagram of a second optical fiber connector provided by an embodiment of the present invention;

3 is a schematic structural diagram of a third optical fiber connector provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of an optical fiber connector provided by an embodiment of the present invention;

5 is a schematic structural diagram of a fourth optical fiber connector provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a fifth optical fiber connector provided by an embodiment of the present invention;

Figure 7 is a schematic structural diagram of another optical fiber connector provided by an embodiment of the present invention;

8 is a schematic side view of the structure of an optical fiber connector provided by an embodiment of the present invention;

9 is a schematic structural diagram of an optical fiber connector provided by an embodiment of the present invention from multiple perspectives;

10 is a schematic flowchart of a method for manufacturing an optical fiber connector according to an embodiment of the present invention;

11 is a schematic structural diagram of a relative position of a first substrate and a second substrate provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of another relative position structure of the first substrate and the second substrate provided by an embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

In the description of the present invention, the terms "inner", "outer", "longitudinal", "horizontal", "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship based on the accompanying drawings. The orientation or positional relationship shown is only for the convenience of describing the present invention and does not require that the present invention must be constructed and operated in a specific orientation, so it should not be understood as a limitation to the present invention.

In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

At present, single-channel optical fiber connectors are mainly used for the common end of optical module devices. After the optical waveguide is coupled, when the power (energy) of the optical signal passing through the common end is too large, the single-channel optical fiber connector will suffer from end-face burn damage and high power. Conditions such as performance degradation have caused the performance of the optical fiber connector to fail to meet the requirements. In order to solve the aforementioned problems, the present invention provides an optical fiber connector that can avoid the problems of end face burnout and high-power performance degradation caused by excessive power, and is especially suitable for single-channel and high-power application scenarios .

Example 1:

1 to 3, this embodiment provides an optical fiber connector, the optical fiber connector includes a transmission fiber 1; the coupling end surface of the optical fiber connector is provided with a coating layer 2, the first of the coating layer 2 The side and/or the second side are provided with a slot 3, wherein the projection of the transmission fiber 1 on the coupling end surface of the optical fiber connector falls into the coating layer 2.

Wherein, the number of slots 3 can be one or two, and the number of slots 3 can be determined according to specific conditions. For example, when the transmission optical fiber 1 is arranged at the edge of the optical fiber connector, only one slot 3 may be provided; when the transmission optical fiber 1 is arranged in the middle area of the optical fiber connector, two grooves 3 may be provided.

As shown in Figure 1 and Figure 2, the coupling end surface of the optical fiber connector is provided with a slot 3, which is explained from the perspective shown in Figure 1. A slot is provided on the first side (left side) of the coating layer 2 3; To illustrate from the perspective shown in FIG. 2, a slot 3 is provided on the second side (right side) of the coating layer 2. As shown in Figure 3, the coupling end surface of the optical fiber connector is provided with two slots 3, which are explained from the perspective shown in Figure 3. On the first side (left side) and the second side (right side) of the coating layer 2 ) Are provided with a slot 3 correspondingly.

In practical application scenarios, in order to better reduce the end surface reflection, the number of slots 3 is two, and the two slots 3 are arranged symmetrically with respect to the coating layer 2, which can not only reduce the end surface to a large extent Reflection, and can ensure the uniformity of the optical signal transmission in the transmission fiber 1.

The coupling end surface of the optical fiber connector of this embodiment is provided with a slot 3, the optical signal directed to the light-passing surface enters the transmission fiber 1, and the optical signal directed to the slot 3 is mainly radiated into the air through the slot 3. The end face reflection is reduced, so that the optical fiber connector can withstand higher optical power and temperature, and the performance of the optical fiber connector is improved. At the same time, compared with the prior art, the optical fiber connector of the present invention does not change the packaging size of the optical fiber connector, does not need to customize an optical fiber with a special diameter, has the advantages of low cost and miniaturization, and broadens the application scenarios of the product.

4, the optical fiber connector of this embodiment includes a first substrate 41 and a second substrate 42, wherein the material of the first substrate 41 and the second substrate 42 can be glass, optionally, the first substrate 41 and the second substrate 41 The material of the second substrate 42 can also be other silicon doped synthetic materials such as silicon dioxide, which can be specifically selected according to actual conditions, and there is no specific limitation here.

In this embodiment, the transmission fiber 1 is arranged between the first substrate 41 and the second substrate 42, and transmits optical signals through the transmission fiber 1, where the transmission fiber 1 is generally a single-core fiber. As shown in Figures 1 to 4, the coating layer 2 is provided on the side surfaces of the first substrate 41 and the second substrate 42, wherein the location and specific size of the coating layer 2 generally depend on the location of the transmission fiber 1 The position and diameter ensure that the projection of the transmission optical fiber 1 on the coupling end surface of the optical fiber connector falls into the coating layer 2.

In this embodiment, in order to ensure that the optical signal directed to the slot 3 can be emitted through the air and reduce the reflection of the optical signal, there are at least three alternatives for the cut-off position of the slot 3 in the longitudinal direction. : (1) As shown in Figure 5, the slot 3 penetrates the first substrate 41 in the longitudinal direction, and part of the second substrate 42 is penetrated; (2) As shown in Figure 6, the slot 3 penetrates the second substrate 42 in the longitudinal direction. , A portion of the first substrate 41 is penetrated; (3) As shown in FIG. 4, the slot 3 penetrates the first substrate 41 and the second substrate 42 at the same time in the longitudinal direction.

For mode (1) and mode (2), in the longitudinal direction, there is only one opening in the slot 3 to communicate with the air, and the area where the light signal radiates through the air is small; for mode (3), in the longitudinal direction, the slot 3 exists The two openings are in communication with the air, and the light signal radiates through the air in a larger area. Therefore, in a preferred solution, in order to better reduce the end surface reflection, the first substrate 41 and the second substrate 42 may be cut in the longitudinal direction, so that the slot 3 penetrates the first substrate 41 and the second substrate at the same time. The second substrate 42.

Of course, if there are objective factors that cause the slot 3 to be arranged according to the method (1) or method (2), an anti-reflection film can be provided on the substrate where the slot 3 does not penetrate, so that the light signal can be reflected into the air. Reduce end-face reflection.

In a specific application scenario, the shape of the slot 3 is not specifically limited, and may be any one of a square groove, a rectangular groove, a V-shaped groove, or a U-shaped groove, depending on the shape of the cutting blade.

In a specific application scenario, since the transmission fiber 1 is cylindrical, if only one transmission fiber 1 is provided on the first substrate 41, it is easy to appear that the second substrate 42 uses the transmission fiber 1 as a fulcrum relative to the first substrate 41. Shake (similar to a seesaw movement) until equilibrium is reached. At this time, the gap between the first substrate 41 and the second substrate 42 is not equal, and the force received by the transmission fiber 1 is uneven, which not only increases the difficulty of the manufacturing process of the optical fiber connector, but also It also reduces the performance of the optical fiber connector.

In order to solve the foregoing problem, in a preferred embodiment, the optical fiber connector further includes at least one auxiliary optical fiber 5, wherein the number of auxiliary optical fibers 5 is not specifically limited, and may be one, two or more. In this embodiment, the pigtail of the auxiliary fiber 5 is removed. In actual use, the auxiliary fiber 5 does not transmit optical signals.

Here, as shown in FIG. 4, the description is made by taking the number of auxiliary optical fibers 5 as two as an example. In this embodiment, the auxiliary optical fiber 5 is arranged on the first substrate 41, the auxiliary optical fiber 5 is arranged on both sides of the transmission optical fiber 1, and the distance between the auxiliary optical fiber 5 and the transmission optical fiber 1 is not determined. For specific restrictions, it is sufficient to reserve a space for opening the slot 3. In a preferred embodiment, in order not to affect the optical signal transmission, the auxiliary optical fiber 5 is arranged in other areas except the coating layer 2.

In this embodiment, the auxiliary fiber 5 and the transmission fiber 1 cooperate with each other, and the auxiliary fiber 5 and the transmission fiber 1 have the same height or substantially the same height relative to the first substrate 41, so that the first substrate The gap between 41 and the second substrate 42 is kept consistent to avoid the inconsistency of left and right heights, to ensure that the force of the transmission optical fiber 1 is uniform, and to improve the performance of the optical fiber connector.

In a specific application scenario, as shown in FIG. 7, a plurality of optical fiber receiving grooves 6 are provided on the first substrate 41, and the optical fiber receiving grooves 6 are used to receive the transmission optical fiber 1 and the auxiliary optical fiber 5, respectively. To fix the transmission fiber 1 and the auxiliary fiber 5.

In order to improve the optical fiber transmittance, in a preferred embodiment, an anti-reflection coating is provided on the coating layer 2, and the remaining reflectivity of the anti-reflection coating is less than 0.2%, so that more optical signals enter the transmission optical fiber 1. In, the end reflection is further reduced. In an optional embodiment, the anti-reflection coating is a broadband anti-reflection coating of 1310 nm to 1550 nm, and the spectrum requirement is 1260 nm to 1600 nm. The specification requirements of the anti-reflection coating may be determined according to the scene of the optical fiber connector.

In this embodiment, in order to achieve a better light transmission effect and better reduce end surface reflection, as shown in FIG. 7, the width D2 of the groove 3 is 200 μm to 800 μm, and the depth L of the groove 3 is 300 μm to 900 μm. . Correspondingly, as shown in Figure 8, the width D1 of the coating layer 2 is 195μm±10μm. The entire coating layer 2 can be coated, or a part of the coating layer 2 can be coated, which can be selected according to the actual situation. Here, No specific restrictions.

In the optical fiber connector of this embodiment, the coating layer 2 is provided with an antireflection coating to increase the light transmittance and reduce the reflectance of the optical fiber; a slot 3 is provided on the end surface, and the optical signal directed to the slot 3 is emitted through the slot 3 In the air, the end surface reflection (diffuse emission and echo reflection) can be reduced. After the optical fiber connector is subsequently coupled with other modules, it can withstand higher power and temperature even if there is glue. On the other hand, the package size of the connector is not changed through cutting and coating, and the packaged optical module product has the advantage of low cost and realizes the miniaturization of the module.

Example 2:

Compared with the description of the structure in Embodiment 1, the embodiment of the present invention also provides a feasible parameter configuration.

As shown in Fig. 9, the coupling end face of the optical fiber connector of this embodiment is inclined at an angle a relative to the horizontal plane, where the value range of the angle a is 82°±0.3°, and the value range of the height h1 of the first substrate 41 is 1.5mm±0.05mm, the height h2 of the second substrate 42 ranges from 1mm±0.05mm, the width w of the first substrate 41 and the second substrate 42 ranges from 3mm±0.05mm, and the length of the first substrate 41 The value range of L1 is 10mm±0.75mm, and the length L2 of the transmission fiber 1 beyond the first substrate 41 is greater than 1500mm.

With reference to FIGS. 7 and 8, the width D2 of the groove 3 is 200 μm to 800 μm, and the depth L of the groove 3 is 300 μm to 900 μm. Correspondingly, the width D1 of the coating layer 2 is 195 μm±10 μm.

Example 3:

This embodiment also provides a method for manufacturing an optical fiber connector, and the method for manufacturing an optical fiber connector in this embodiment is applicable to the optical fiber connector of Embodiment 1 or Embodiment 2 above. 10, the manufacturing method of the optical fiber connector of this embodiment will be described in detail.

In step 101, a transmission optical fiber is prepared, and the transmission optical fiber is arranged between the first substrate and the second substrate.

Prepare a qualified transmission optical fiber, arrange the transmission optical fiber between the first substrate and the second substrate, and first accommodate the transmission optical fiber in the corresponding optical fiber receiving groove, and then the first substrate and the second substrate are relatively attached and arranged .

In step 102, the first substrate and the second substrate are cut on the first side and/or the second side of the transmission fiber to form a slot.

In this embodiment, the optical fiber connector (the semi-finished product in the step) is clamped on the fixing fixture, and the fixing screw is checked to ensure that the optical fiber connector does not slide.

On the first side and/or the second side of the transmission fiber, the first substrate and the second substrate are cut to form a slot. In combination with Embodiment 1, the number of slots can be one (as shown in FIG. 1 and FIG. 2) or two (as shown in FIG. 3). For details, refer to Embodiment 1, which will not be repeated here. When the number of slots is two, the two slots are symmetrically distributed with respect to the transmission fiber.

Wherein, the slot penetrates the first substrate and/or the second substrate, which can be seen in detail in FIGS. 4 to 6 and related text descriptions in Embodiment 1, which will not be repeated here.

After setting the slot, check the end face of the transmission fiber to ensure that the end face of the transmission fiber is intact, and at the same time perform light-pass detection to ensure that the transmission fiber can normally transmit optical signals. In addition, in order to improve the performance of the optical fiber connector, it is necessary to detect the end face of the optical fiber connector to ensure that there is no chipping.

In step 103, a film is coated on the side surfaces of the first substrate and the second substrate to form a coating layer, wherein the projection of the transmission fiber on the coupling end surface of the optical fiber connector falls into the coating layer.

After the slotting and coating are completed, the quality of the end surface coating and slitting is checked with a microscope, and the qualified optical fiber connectors are packed into the warehouse and transferred to the next process as the general raw material for optical device modules.

In a preferred embodiment, in step 101, a transmission optical fiber is prepared, and the transmission optical fiber is arranged between the first substrate and the second substrate, which specifically includes: preparing transmission optical fibers and auxiliary optical fibers, wherein the number of auxiliary optical fibers can be It is one, two or more, which is not specifically limited here. Set the transmission fiber and the auxiliary fiber on the first substrate and the second substrate; adjust the relative positions of the first substrate and the second substrate so that the first substrate and the second substrate are The interleaving distance between the two is smaller than a preset value, where the preset value may be determined according to actual conditions, for example, the preset value may be 0.5 mm.

As shown in FIG. 11, the staggered distance between the first substrate and the second substrate is less than a preset value, and the relative position of the first substrate and the second substrate can meet the requirements; as shown in FIG. 12, the first substrate The staggered distance between a substrate and the second substrate is greater than a preset value, the relative position of the first substrate and the second substrate cannot meet the demand, and needs to be re-adjusted to make the first substrate and the second substrate The staggered distance between the second substrates is less than a preset value.

In this embodiment, the auxiliary optical fiber and the transmission optical fiber cooperate with each other, and the auxiliary optical fiber and the transmission optical fiber have the same height or substantially the same height relative to the first substrate, so that the first substrate and the second substrate The gap between the substrates is kept consistent to avoid the inconsistency of left and right heights, to ensure uniform force on the transmission fiber, and to improve the performance of the optical fiber connector.

In a preferred embodiment, in step 103, coating the side surfaces of the first substrate and the second substrate to form a coating layer specifically includes: shielding the side surfaces of the first substrate and the second substrate corresponding to the auxiliary fiber; Adhesive tape can be used to affix the side surfaces of the first substrate and the second substrate corresponding to the auxiliary optical fiber (as shown in Figure 7, the grooves and other areas of the coating layer are removed). The size of the tape paper depends on the size of the area to be blocked, for example, 1.3mm*20mm tape paper can be used. Then, the end face inspection is performed again to ensure that the end face of the optical fiber connector is qualified. Finally, the side surfaces of the first substrate and the second substrate corresponding to the transmission fiber are coated to form a coating layer. Among them, the coating requirements are based on actual conditions. Antireflection coatings can be coated. The specifications of the antireflection coatings are 1310nm-1550nm broadband antireflection coatings, the spectrum requirements are 1260nm ~ 1600nm, and the remaining reflectance is less than 0.2%.

The optical fiber connector manufactured by the method of manufacturing the optical fiber connector of this embodiment has at least the following advantages: the coupling end surface of the optical fiber connector is provided with a slot, and the optical signal directed to the light-passing surface enters the transmission fiber, and the direction is open. The optical signal of the slot is dissipated into the air through the slot, which reduces the end face reflection, so that the optical fiber connector can withstand higher optical power and temperature, and the performance of the optical fiber connector is improved. At the same time, compared with the prior art, the optical fiber connector of the present invention does not change the packaging size of the optical fiber connector, does not need to customize an optical fiber with a special diameter, has the advantages of low cost and miniaturization, and broadens the application scenarios of the product.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.

Claims

An optical fiber connector, characterized in that the optical fiber connector includes a transmission optical fiber (1);

A coating layer (2) is provided on the coupling end surface of the optical fiber connector, and a slot (3) is provided on the first side and/or the second side of the coating layer (2);

The projection of the transmission optical fiber (1) on the coupling end surface of the optical fiber connector falls into the coating layer (2).
The optical fiber connector according to claim 1, wherein the optical fiber connector comprises a first substrate (41) and a second substrate (42), and the transmission optical fiber (1) is arranged on the first substrate ( 41) and the second substrate (42);

The coating layer (2) is arranged on the side surfaces of the first substrate (41) and the second substrate (42);

The slot (3) penetrates the first substrate (41) and/or the second substrate (42).
The optical fiber connector according to claim 2, wherein the optical fiber connector further comprises at least one auxiliary optical fiber (5), and the auxiliary optical fiber (5) is arranged on the first substrate (41), and The auxiliary optical fiber (5) is arranged in other areas except the coating layer (2);

The auxiliary optical fiber (5) and the transmission optical fiber (1) cooperate with each other, so that the gap between the first substrate (41) and the second substrate (42) remains consistent.
The optical fiber connector according to claim 3, wherein a plurality of optical fiber receiving grooves (6) are provided on the first substrate (41), and the optical fiber receiving grooves (6) are respectively used for receiving the transmission Optical fiber (1) and said auxiliary optical fiber (5).
The optical fiber connector according to any one of claims 1 to 4, wherein the shape of the slot (3) is any one of a rectangular groove, a square groove, a V-shaped groove or a U-shaped groove.
The optical fiber connector according to any one of claims 1 to 4, wherein the width of the coating layer (2) is 195 μm ± 10 μm, the width of the slot (3) is 200 μm to 800 μm, and the The depth of the groove (3) is 300 μm to 900 μm.
The optical fiber connector according to any one of claims 1 to 4, wherein an anti-reflection coating is provided on the coating layer (2), and the remaining reflectivity of the anti-reflection coating is less than 0.2%.
A manufacturing method of an optical fiber connector, characterized in that the manufacturing method includes:

Preparing a transmission optical fiber, and placing the transmission optical fiber between the first substrate and the second substrate;

Cutting the first substrate and the second substrate on the first side and/or the second side of the transmission fiber to form a slot;

Coating the side surfaces of the first substrate and the second substrate to form a coating layer, wherein the projection of the transmission fiber on the coupling end surface of the optical fiber connector falls into the coating layer.
The manufacturing method according to claim 8, wherein the preparing the transmission fiber and arranging the transmission fiber on the first substrate and the second substrate comprises:

Preparing a transmission fiber and an auxiliary fiber, and arranging the transmission fiber and the auxiliary fiber on the first substrate and the second substrate;

The relative positions of the first substrate and the second substrate are adjusted so that the staggered distance between the first substrate and the second substrate is smaller than a preset value.
The manufacturing method according to claim 9, wherein coating a film on the side surfaces of the first substrate and the second substrate to form a coating layer comprises:

Shielding the side surfaces of the first substrate and the second substrate corresponding to the auxiliary fiber;

Coating the side surfaces of the first substrate and the second substrate corresponding to the transmission optical fiber to form a coating layer.