CN112415670B - Ferrule components, connectors, fiber optic adapters and fiber optic interface structures - Google Patents

Abstract

The embodiment of the present application discloses a ferrule assembly, a connector, an optical fiber adapter and an optical fiber interface structure, including: a connector; the connector includes a shell assembly and a ferrule assembly at least partially placed in the shell assembly; the The ferrule assembly includes a tail handle, a first positioning part and a multi-core optical fiber; the core of the multi-core optical fiber is passed through the tail handle; the first positioning part is arranged on the tail handle; and the optical fiber Adapter; the optical fiber adapter includes a fixing part; the fixing part is locked in rotation with the first positioning part so that the circumferential position of the multi-core optical fiber is relatively fixed. The ferrule assembly, connector, optical fiber adapter, and optical fiber interface structure of the embodiment of the present application have the advantage of good circumferential positioning accuracy.

Description

Ferrule components, connectors, fiber optic adapters and fiber optic interface structures

technical field

The present application relates to the field of optical communication, in particular to a ferrule assembly, a connector, an optical fiber adapter and an optical fiber interface structure.

Background technique

Multi-core fiber (Multi Core Fiber) is an optical fiber with multiple cores in the common cladding region. Because it can increase the integration density per unit area of the transmission line, it has multiple physical channels, low crosstalk between cores, and the With the characteristics of good core attenuation consistency, it is more and more widely used in ultra-large-capacity optical fiber communication systems, new large-capacity multi-service access networks, distributed optical fiber sensing systems, and medical equipment.

Different from the core of the single-core optical fiber in the center, since the multiple cores of the multi-core optical fiber surround the center of the multi-core optical fiber in the circumferential direction, when two sections of multi-core optical fiber are connected, usually a fiber adapter is used at both ends Each is equipped with a connector with a multi-core optical fiber, and the high-precision rotational alignment of the multi-core optical fiber of the connector, that is, around the axial direction of the multi-core optical fiber, the core of the array is set at a predetermined array position, In order to make the cores of the two sections of multi-core optical fiber align with each other to realize the smooth flow of each channel; therefore, the circumferential positioning of the multi-core optical fiber is very important for the signal transmission of each channel of the multi-core optical fiber. In the prior art, the multi-core optical fiber and the tail handle and housing of the connector are fixed in the circumferential direction in sequence, and then the housing and the adapter are used for circumferential fixing. Multiple positioning makes the circumferential positioning accuracy between the two sections of optical fiber poor, affecting transmission effect.

Contents of the invention

In view of this, the embodiment of the present application expects to provide a ferrule assembly, a connector, an optical fiber adapter and an optical fiber interface structure, so as to solve the problem of poor circumferential positioning accuracy in the prior art.

In order to achieve the above-mentioned purpose, the technical scheme of the embodiment of the present application is realized in this way:

An optical fiber interface structure, comprising: a connector; the connector includes a shell assembly and a ferrule assembly at least partially placed in the shell assembly; the ferrule assembly includes a tail handle, a first positioning part, and a multi-core optical fiber ; the core of the multi-core optical fiber is set in the tail handle; the first positioning part is arranged on the tail handle; and an optical fiber adapter; the optical fiber adapter includes a fixing part; The first positioning part is anti-rotationally fitted so that the circumferential position of the multi-core optical fiber is relatively fixed.

Further, the first positioning part is one of a positioning post and a positioning hole; the fixing part is the other of a positioning post and a positioning hole.

Further, when the first positioning part is a positioning column, the end of the first positioning part away from the tail handle is provided with a tapered section; when the first positioning part is a positioning hole, the first positioning part The inlet end is provided with a bell mouth.

Further, the ferrule assembly includes a ferrule, and the ferrule is fixed on one end of the tail handle; the fiber core passes through the tail handle and the ferrule in turn; the optical fiber adapter includes a body , a support portion and a sleeve; an axially penetrating channel is formed in the body; the support portion is supported in the channel and divides the channel into at least two sub-sections for plugging into the shell assembly The installation hole; the sleeve is hollow and arranged along the axial direction of the passage, the sleeve is fixed on the support part and communicates with the two sub-installation holes, and one end of the ferrule is inserted in the The sleeve; the fixing part is arranged on the body or the supporting part.

A ferrule assembly, including a tail handle, a ferrule, a first positioning part and a multi-core optical fiber; the multi-core optical fiber includes a cladding and at least two fiber cores arranged in the cladding; the ferrule is fixed It is arranged on one end of the tail handle; the fiber core passes through the tail handle and the ferrule in turn; the first positioning part is arranged on the tail handle; the first positioning part can be connected with the The fixing part is anti-rotationally fitted so that the circumferential position of the multi-core optical fiber is relatively fixed.

Further, the tail handle includes a handle body and a direction ring sleeved on the handle body; the ferrule is fixed on one end of the handle body, and the fiber core passes through the handle body and the handle body in turn. The ferrule and the first positioning part are fixed on the direction ring; the direction ring is fixed after being rotated to a predetermined position along the circumference of the handle body.

Further, the direction ring protrudes radially outwards to form a protrusion, and the protrusion forms an installation hole along the axial direction of the handle body, and the first positioning part is inserted into the installation hole.

A connector includes a shell assembly and the above-mentioned ferrule assembly; the shell assembly includes an accommodating space passing through front and back, and the tail handle is fixedly arranged in the accommodating space.

Further, the shell assembly includes a shell and a rear sleeve, the shell and the rear sleeve are nested to form the accommodation space through which the front and back pass, and the end of the ferrule away from the tail handle protrudes from the accommodation space .

Further, the first positioning part is a positioning column, and a relief part for avoiding the first positioning part is formed on the wall surface of the accommodating space.

Further, the shell assembly includes a boot and an elastic piece; the elastic piece is arranged in the accommodating space, one end of the elastic piece is against the back sleeve, and the other end is against the tail handle; The tail sleeve is nested on the end of the back sleeve away from the shell.

An optical fiber adapter, comprising a body, a supporting part, a sleeve and a fixing part; an axially penetrating channel is formed in the body; the supporting part is supported in the channel and divides the channel into at least two The sub-installation hole inserted into the shell component; the sleeve is hollow and arranged along the axial direction of the passage, the sleeve is fixed on the support part and communicates with the two sub-installation holes; The fixing part is arranged on the body or the supporting part; the fixing part can be locked in rotation with the first positioning part so that the circumferential positions of the multi-core optical fiber and the sleeve are relatively fixed.

Further, the fixing part is arranged on the supporting part along the axial direction of the channel, and the two ends of the fixing part respectively extend into the two sub-installation holes.

The ferrule assembly, connector, optical fiber adapter and optical fiber interface structure of the embodiment of the present application are provided with a first positioning part on the ferrule assembly and a fixing part on the optical fiber adapter, the first positioning part is arranged on the tail handle, and the first The positioning part can cooperate with the fixed part to prevent rotation, thereby restricting the circumferential movement of the first positioning part, and then restricting the circumferential rotation of the tail handle and the ferrule in the optical fiber adapter, thus directly passing through the tail handle 21 and the optical fiber adapter 8 Circumferential positioning is carried out, which reduces the process of multiple circumferential positioning through the shell in the middle, so that the circumferential positioning accuracy is high.

Description of drawings

FIG. 1 is a schematic diagram of an optical fiber interface structure according to an embodiment of the present application, wherein the connector is separated from the optical fiber adapter;

Fig. 2 is a schematic cross-sectional view of the optical fiber interface structure of the embodiment of the present application, wherein the connector is inserted into the optical fiber adapter;

Fig. 3 is a schematic structural diagram of a ferrule assembly according to an embodiment of the present application;

Fig. 4 is an exploded schematic diagram of a ferrule assembly according to another embodiment of the present application;

Fig. 5 is an exploded schematic diagram of a ferrule assembly according to another embodiment of the present application;

FIG. 6 is a schematic structural diagram of a connector according to an embodiment of the present application;

Fig. 7 is an exploded schematic view of the connector of Fig. 6;

FIG. 8 is a schematic structural diagram of an optical fiber adapter according to an embodiment of the present application;

Fig. 9 is the A-A view of Fig. 8;

FIG. 10 is a view taken along the direction B of FIG. 1 , showing the relative positional relationship between the multi-core optical fiber and the first positioning part, wherein the shell assembly, the direction ring and the tail handle are omitted.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other, and the detailed description in the specific embodiment should be understood as an explanation of the present application, and should not be regarded as an explanation of the present application. Undue Restriction of Application.

In the description of the embodiments of the present application, the orientations or positional relationships of "upper", "lower", "left", "right", "front", and "rear" are based on the orientation or positional relationship shown in Figure 1. It is understood that these orientation terms are only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the scope of the application. limit.

A ferrule assembly, as shown in FIGS. 1 to 7 and 10 , includes a tail handle 21 , a ferrule 22 , a first positioning portion 23 and a multi-core optical fiber 9 . The ferrule assembly 2 is used to cooperate with a fiber optic adapter 8 (mentioned below).

Wherein, the multi-core optical fiber 9 includes a cladding 92 and at least two cores 91 disposed in the cladding 92 . The core 91 may be a glass core. Generally, each fiber core 91 may be arranged in a rectangular arrangement of four cores or in a circular arrangement of seven cores according to different quantities. Taking seven cores as an example, a plurality of fiber cores 91 can be arranged as a pole array, including a central fiber core 91a, and other fiber cores 91b, 91c, 91d, etc. surrounding the center fiber core in a satellite pattern, and other fiber cores 91b The radial distances from , 91c, 91d to the central fiber core 91a can generally be set to be equal for ease of design. In addition, the multi-core optical fiber 9 also includes a plastic sheath 93 wrapped outside the cladding 92 to provide protection.

The ferrule 22 is fixed on one end of the tail handle 21 ; a plurality of fiber cores 91 pass through the tail handle 21 and the ferrule 22 sequentially. As a result, the circumferential positions of the tail handle 21 and the ferrule 22 relative to the fiber core 91 are fixed, and when the tail handle 21 rotates around its own axis 21a, the circumferential positions of the ferrule 22 and the plurality of fiber cores 91 relative to the axis 21a also change. Variety. It can be understood that, usually, the plastic sheath 93 of the multi-core optical fiber 9 does not penetrate into the tail handle 21 and the ferrule 22, and the cladding 92 stripped of the plastic sheath 93 together with the fiber core 91 is inserted into the tail handle 21 and the ferrule 22 , until the fiber core 91 is flush with the end of the ferrule 22 away from the tail handle 21 .

The first positioning part 23 is arranged on the tail handle 21, and the first positioning part 23 can cooperate with the fixed part 84 (mentioned below) in a non-rotating manner, thereby restricting the first positioning part 23 from moving in the circumferential direction, thereby restricting the connection between the tail handle 21 and The ferrule 22 rotates circumferentially in the optical fiber adapter 8, thereby directly performing circumferential positioning with the optical fiber adapter 8 through the tail handle 21, reducing the process of multiple circumferential positioning through the shell in the middle, so that the circumferential positioning accuracy is high .

It should be understood that the transmission between two sections of multi-core optical fiber is achieved by sequentially positioning the ferrule assembly and the optical fiber adapter in the circumferential direction to align each fiber core with each other to ensure smooth transmission channels. Therefore, the multi-core optical fiber and the ferrule assembly itself also need to be positioned in the circumferential direction, so that the multi-core optical fibers of the connectors on both sides of the optical fiber adapter can be at the same circumferential position.

A possible embodiment, as shown in FIGS. 3 to 7 , the tail handle 21 includes a handle body 211 and a direction ring 212 sleeved on the handle body 211 . The handle body 211 can be made of ceramics, plastic or metal; the direction ring 212 can be made of ceramics, plastic or metal.

The ferrule 22 is fixed on one axial end of the handle body 211 , the fiber core 91 passes through the handle body 211 and the ferrule 22 sequentially, and the first positioning portion 23 is fixed on the direction ring 212 . Wherein, the first positioning part 23 can be integrally connected with the direction ring 212, so that the rigidity of the connection between the two is good; considering the cost, processing accuracy and material properties, the first positioning part 23 can also be connected with the direction ring 212 by welding, gluing, Fixed by interference fit and other forms.

The direction ring 212 is fixed after being rotated to a predetermined position along the circumference of the handle body 211 . The fixing method can be glued, welded and so on. A plurality of cores 91 of the multi-core optical fiber 9 are inserted in the ferrule 22, and the direction ring 212 is rotated circumferentially so that the first positioning part 23 is uniformly rotated to an orientation with a fixed angle relative to the core 91, and finally the direction ring is rotated. 212 is fixed to the handle body 211, so that the circumferential relative positions of the different multi-core optical fibers 9 and the corresponding first positioning portion 23 are uniform, thereby realizing the circumferential position fixation of the multi-core optical fiber 9 and the ferrule assembly 2, Then through the first positioning part 23 of the ferrule assembly 2 and the fixing part 84 of the optical fiber adapter 8, the multi-core optical fiber 9-the first positioning part 23-the fixing part 84 completes the circumferential positioning, and the two sections of multi-core optical fiber 9 respectively pass through the above Circumferential positioning is completed in the optical fiber adapter 8 to ensure successful signal transmission of different multi-core optical fibers 9 .

Specifically, as shown in FIG. 10, taking the fiber core 91d as an example, the line connecting the first positioning portion 23 to the center of the multi-core optical fiber 9 forms an angle C with the line connecting the fiber core 91d to the center of the multi-core fiber 9. Control the direction ring 212 to rotate to a predetermined position along the circumference of the handle body 211, C can be any value, at this time, even if the first positioning part 23 and the fixing part 84 complete the circumferential positioning, the core 91d of the two sections of multi-core optical fiber 9 Obviously not necessarily aligned, the channel is disconnected, and the signal transmission cannot be completed. If the first positioning part 23 is driven by the direction ring 212 (not shown in the figure), it is rotated circumferentially along the adjustment path shown by the dotted line until it reaches a predetermined position, and then fixed, thereby ensuring that the multi-core optical fiber 9 and The circumferential relative positions of the corresponding first positioning portions 23 are uniform, thereby ensuring that the circumferential positions of the multi-core optical fiber 9 and the ferrule assembly 2 are fixed.

In actual operation, there are many ways to determine the predetermined position. For example, it is possible to directly measure the angle C between the connecting lines of the fiber core 91d. If it meets the preset value, it means that the direction ring 212 has reached the predetermined position. Otherwise, the first positioning part 23 is driven by the direction ring 212 to perform circumferential rotation along the adjustment path shown by the dotted line and then repeat the detection. In addition, standard connectors can also be directly provided to connect the ferrule assembly 2 with the standard connector in a coupled form, and one end of the standard connector sends signals to the channels represented by each fiber core. When the corresponding signal is received on the fiber core 91, it means that the direction ring 212 has reached the predetermined position. According to the number of cores 91 in the multi-core optical fiber 9 and the arrangement of the cores 91, the number of signal detections of the cores 91 should be greater than or 2 groups.

A possible embodiment, as shown in Figures 3 and 4, the handle body 211 is a cylinder with a through hole (not shown) in the middle, the through hole can allow the fiber core 91 to pass through, and the direction ring 212 is sleeved on the handle The body 211 is on one end close to the ferrule 22 to facilitate the processing of the handle body 211 .

A possible embodiment, as shown in Fig. 3, Fig. 4 and Fig. 7, the handle body 211 is a stepped shaft with a through hole (not marked) in the middle, and the through hole can pass through the fiber core 91; wherein, the ferrule 22 is fixed on one end of the handle body 211 with a larger diameter, and the direction ring 212 is sleeved on one end of the handle body 211 with a larger diameter.

A possible embodiment, as shown in Fig. 3 and Fig. 4 , the direction ring 212 protrudes outward in the radial direction to form a protrusion 2121, and the protrusion 2121 forms a mounting hole 2122 along the axial direction of the handle body 211, the first positioning The first positioning part 23 is a positioning column, and the first positioning part 23 is inserted in the installation hole 2122, which facilitates the processing of the first positioning part 23 and ensures that it has high dimensional accuracy, so as to facilitate the axial fit of the fixed part 84 of the optical fiber adapter 8. .

Another connector is provided here, as shown in FIG. 1 to FIG. 7 and FIG. 10 , comprising a shell assembly 71 and the ferrule assembly 2 of the above-mentioned embodiments. The shell assembly 71 includes a receiving space 711 through which the tail handle 21 is fixed. The housing assembly 71 can be plugged into the sub-installation hole 811 a of the optical fiber adapter 8 . The accommodating space 711 can be closed in the circumferential direction, so as to realize the sealing of the multi-core optical fiber during the contact process and prevent dust.

A possible embodiment, as shown in FIG. 6 and FIG. 7 , the shell assembly 71 includes a shell 712 and a rear cover 713 . The outer shell 712 can be a shell with a through hole, the rear cover 713 can be a cylinder with a through hole, the two are fixed by clipping, the outer shell 712 and the rear cover 713 are nested to form a receiving space 711 through the front and rear, which is convenient Holds ferrule assembly 2.

It can be understood that the design of the structure is various, so the various components in the ferrule assembly 2 are not necessarily all in the accommodation space 711, only need to be fixed in the accommodation space 711 by setting the tail handle 21, and the other components are directly or indirectly connected with the housing space 711. Tail handle 21 is fixed and gets final product.

The end of the ferrule 22 away from the tail handle 21 protrudes from the accommodation space 711 , and the end of the ferrule 22 away from the rear sleeve 713 protrudes from the shell 712 , so that the end of the ferrule 22 away from the tail handle 21 is inserted into the sleeve 83 conveniently. The ferrules 22 of the ferrule assemblies 2 of the two connectors 7 can be respectively inserted from both sides of the sleeve 83 to achieve docking, and the sleeve 83 provides functions such as sealing, protection and guidance.

In a possible embodiment, as shown in FIG. 6 and FIG. 7 , when the first positioning portion 23 is a positioning column, a relief portion 716 for avoiding the first positioning portion 23 is formed on the wall surface of the accommodating space 711 . Specifically, the relief portion 716 may be formed by being recessed in the shell 712 , or may be formed by a hole in the rear cover 713 , as long as it can prevent interference with the first positioning portion 23 .

A possible embodiment, as shown in FIG. 3 to FIG. 7 , the shell assembly 71 includes a boot 714 and an elastic member 715; the elastic member 715 may be a spring. The elastic member 715 is disposed in the accommodation space 711 , one end of the elastic member 715 abuts against the rear sleeve 713 , and the other end abuts against the tail handle 21 ; The elastic member 715 provides force to the ferrule 22 through the tail handle 21. When the ferrule 22 of the ferrule assembly 2 of the two connectors 7 is respectively inserted from both sides of the sleeve 83, the elastic member 715 can change the volume so that both There is no hard contact, and the force of the elastic member 715 makes the two ferrules 22 butt tightly.

An optical fiber adapter is provided here to cooperate with the connector 7; as shown in Figure 1, Figure 2, Figure 8 and Figure 9, the optical fiber adapter 8 includes a body 81, a supporting part 82, a sleeve 83 and a fixing part 84 . The sleeve 83 can be made of ceramics.

A channel 811 axially penetrating is formed in the body 81 . The support portion 82 is supported in the passage 811 and divides the passage 811 into at least two sub-installation holes 811 a for plugging into the shell assembly 71 . The sleeve 83 is hollow and arranged along the axial direction of the channel 811. The sleeve 83 is fixed on the support portion 82 and communicates with the two sub-installation holes 811a; the end of the ferrule 22 away from the tail handle 21 can be inserted into the sleeve 83; The fixing part 84 is disposed on the body 81 or the supporting part 82 .

The fixing part 84 can be locked in cooperation with the first positioning part 23, thereby restricting the circumferential movement of the first positioning part 23, and further restricting the circumferential rotation of the tail handle 21 and the ferrule 22 in the optical fiber adapter 8, thereby directly Circumferential positioning is performed through the tail handle 21 and the optical fiber adapter 8, which reduces the process of performing multiple circumferential positioning through the shell in the middle, so that the circumferential positioning accuracy is high.

In a possible embodiment, as shown in FIG. 9 , the fixing part 84 is arranged on the support part 82 along the axial direction of the passage 811, and the two ends of the fixing part 84 respectively extend into two sub-mounting holes 811a, so that one fixing part 84 It can cooperate with the first positioning parts 23 of the ferrule assemblies 2 of the two connectors 7 respectively, so that the circumferential accuracy of the ferrule assemblies 2 at both ends is good.

An optical fiber interface structure is further provided here. As shown in FIG. 1 to FIG. 10 , the optical fiber interface structure includes the connector 7 in the above-mentioned embodiments and the optical fiber adapter 8 in the above-mentioned embodiments. Specifically, the connector 7 includes a shell assembly 71 and a ferrule assembly 2 at least partially placed in the shell assembly 71; the ferrule assembly 2 includes a tail handle 21, a first positioning portion 23 and a multi-core optical fiber 9; the multi-core optical fiber 9 The fiber core 91 is passed through the tail handle 21 ; the first positioning portion 23 is disposed on the tail handle 21 . The fiber optic adapter 8 includes a body 81 and a fixing portion 84 . A sub-installation hole 811 a is formed in the body 81 . The sub-installation hole 811a is inserted into the shell assembly 71 .

The fixing part 84 is engaged with the first positioning part 23 in anti-rotation, thereby restricting the circumferential movement of the first positioning part 23, and further restricting the circumferential rotation of the tail handle 21 and the ferrule 22 in the optical fiber adapter 8, thereby making the multi-core optical fiber 9 The circumferential position of the multi-core optical fiber is relatively fixed, thereby realizing the circumferential position fixation of the multi-core optical fiber, the tail handle of the connector, and the adapter in turn, reducing the process of multiple circumferential positioning through the shell in the middle, and making the circumferential positioning accuracy high.

In a possible embodiment, the first positioning part 23 is one of the positioning post and the positioning hole; the fixing part 84 is the other one of the positioning post and the positioning hole, and the two holes are axially fitted. Of course, other matching methods can also be used, such as clamping the slot, as long as the tail handle 21 and the ferrule 22 can be prevented from rotating in the optical fiber adapter 8 in the circumferential direction.

The first positioning part 23 and the fixing part 84 can be made of ceramics, plastic or metal. When the first positioning part 23 is a positioning column, the end of the first positioning part 23 away from the tail handle 21 is provided with a tapered section; when the first positioning part 23 is a positioning hole, the inlet end of the first positioning part 23 is provided with a bell mouth.

In a possible embodiment, as shown in Figures 1 to 9, the outside of the housing 712 includes an elastic clip 7121, and the body 81 is formed with an axial limit hole (not marked) that cooperates with the elastic clip 7121 to Axial displacement between the shell 712 and the body 81 is restricted.

In a possible embodiment, the ferrule assembly 2 includes a ferrule 22, and the ferrule 22 is fixed on one end of the tail handle 21; the fiber core 91 passes through the tail handle 21 and the ferrule 22 in turn until it is far away from the ferrule 22. One end of tail handle 21 is flush. The fiber optic adapter 8 includes a support portion 82 and a sleeve 83 ceramics; a channel 811 axially penetrating and circumferentially closed is formed in the body 81; the support portion 82 is supported in the channel 811 and separates the channel 811 into at least two for connecting with the shell The sub-installation hole 811a where the component 71 is inserted. The sleeve 83 is hollow and arranged along the axial direction of the channel 811. The sleeve 83 is fixed on the support portion 82 and communicates with two sub-mounting holes 811a. The end of the ferrule 22 away from the tail handle 21 is inserted into the sleeve 83; The part 84 is arranged on the body 81 or the support part 82; thus the circumferential position of the multi-core optical fiber 9 is relatively fixed, thereby realizing the circumferential position fixation of the multi-core optical fiber, the tail handle of the connector, and the adapter in sequence, reducing intermediate The process of performing multiple circumferential positioning through the shell makes the circumferential positioning accuracy high.

The various embodiments/implementations provided in this application can be combined with each other if no contradiction arises.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (11)

1. A fiber optic interface structure, comprising:

a connector (7); the connector (7) comprises a shell assembly (71) and a ferrule assembly (2) at least partially disposed within the shell assembly (71); the ferrule assembly (2) comprises a tail handle (21), a first positioning part (23) and a multi-core optical fiber (9); a fiber core (91) of the multi-core optical fiber (9) is arranged in the tail handle (21) in a penetrating mode; the first positioning part (23) is arranged on the tail handle (21); the ferrule assembly (2) comprises a ferrule (22), and the ferrule (22) is fixedly arranged at one end of the tail handle (21); the fiber core (91) sequentially penetrates through the tail handle (21) and the inserting core (22);

and a fibre optic adapter (8); the optical fiber adapter (8) comprises a body (81), a support part (82), a sleeve (83) and a fixing part (84); the sleeve (83) is fixedly arranged on the supporting part (82), and one end of the ferrule (22) is inserted into the sleeve (83); the fixing part (84) is arranged on the body (81) or the supporting part (82), and one end of the first positioning part (23) is inserted into the fixing part (84);

wherein the fixing part (84) is in rotation-stop fit with the first positioning part (23) so that the circumferential position of the multi-core optical fiber (9) is relatively fixed; the tail handle (21) comprises a handle body (211) and a direction ring (212) sleeved on the handle body (211); the inserting core (22) is fixedly arranged at one end of the handle body (211), the fiber core (91) sequentially penetrates through the handle body (211) and the inserting core (22), and the first positioning part (23) is fixed on the direction ring (212).

2. The optical fiber interface structure of claim 1, wherein the first positioning portion (23) is one of a positioning post and a positioning hole; the fixing part (84) is the other one of the positioning column and the positioning hole.

3. The optical fiber interface structure according to claim 2, wherein when the first positioning portion (23) is a positioning post, an end of the first positioning portion (23) away from the tail handle (21) is provided with a taper section;

when the first positioning part (23) is a positioning hole, a horn mouth is arranged at the inlet end of the first positioning part (23).

4. A ferrule assembly to be mated with the fiber optic adapter (8) of claim 1, wherein the ferrule assembly (2) comprises a tail handle (21), a ferrule (22), a first positioning portion (23), and a multi-core fiber (9);

the multi-core optical fiber (9) comprises a cladding (92) and at least two cores (91) arranged in the cladding (92);

the inserting core (22) is fixedly arranged at one end of the tail handle (21); the fiber core (91) sequentially penetrates through the tail handle (21) and the insertion core (22); the first positioning part (23) is arranged on the tail handle (21);

the first positioning portion (23) is capable of fitting with the fixing portion (84) in a rotation stop manner so that the circumferential position of the multicore fiber (9) is relatively fixed.

5. The ferrule assembly according to claim 4, wherein the direction ring (212) is formed with a boss (2121) radially outwardly protruded, the boss (2121) is formed with a mounting hole (2122) in an axial direction of the shank body (211), and the first positioning portion (23) is inserted in the mounting hole (2122).

6. A connector characterized by comprising a housing assembly (71) and a ferrule assembly (2) according to any one of claims 4 to 5; the shell assembly (71) comprises an accommodating space (711) which is through from front to back, and the tail handle (21) is fixedly arranged in the accommodating space (711).

7. The connector according to claim 6, wherein the housing assembly (71) comprises a housing (712) and a rear sleeve (713), the housing (712) is nested with the rear sleeve (713) to form the accommodation space (711) penetrating from front to back, and one end of the ferrule (22) away from the tail stem (21) protrudes out of the accommodation space (711).

8. The connector according to claim 6, wherein the first positioning portion (23) is a positioning post, and a relief portion (716) for avoiding the first positioning portion (23) is formed on a wall surface of the accommodating space (711).

9. The connector of claim 7, wherein the shell assembly (71) includes a boot (714) and a spring (715); the elastic piece (715) is arranged in the accommodating space (711), one end of the elastic piece (715) is abutted against the rear sleeve (713), and the other end of the elastic piece (715) is abutted against the tail handle (21); the tail sleeve (714) is nested on an end of the rear sleeve (713) remote from the outer shell (712).

10. A fiber optic adapter to mate with the connector (7) of claim 1, wherein the fiber optic adapter (8) comprises a body (81), a support (82), a sleeve (83), and a securing portion (84);

an axially through channel (811) is formed in the body (81);

the supporting part (82) is supported in the channel (811) and divides the channel (811) into at least two sub-mounting holes (811 a) for plugging with the shell component (71);

the sleeve (83) is hollow and is arranged along the axial direction of the channel (811), and the sleeve (83) is fixedly arranged on the supporting part (82) and communicated with the two sub-mounting holes (811 a);

the fixing portion (84) is provided on the body (81) or the support portion (82);

the fixing portion (84) can be in rotation stop fit with the first positioning portion (23) so that the circumferential positions of the multi-core optical fiber (9) and the sleeve (83) are relatively fixed.

11. The optical fiber adapter according to claim 10, wherein the fixing portion (84) is provided on the supporting portion (82) in an axial direction of the passage (811), and both ends of the fixing portion (84) extend into the two sub-mounting holes (811 a), respectively.

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