CN115903147A - Polarization maintaining optical fiber connector and pin component thereof - Google Patents

Abstract

The invention relates to a polarization maintaining optical fiber connector and a pin component thereof, wherein the pin component comprises a ceramic pin, a front sleeve, a rear sleeve and a spring, the front sleeve and the rear sleeve are in threaded connection to form a cavity for assembling the ceramic pin, the rear end of the ceramic pin is sleeved with a tail handle, and the spring is sleeved on the tail handle; the outer wall of the front sleeve is provided with a key, the front end of the rear sleeve is provided with a clamping jaw, the tail handle is provided with a clamping jaw groove, the clamping jaw is matched with the clamping jaw groove so that the ceramic contact pin can be driven to synchronously rotate when the rear sleeve rotates, the front sleeve is provided with a glue injection groove, and the glue injection groove is positioned at the threaded connection part of the front sleeve and the rear sleeve; when the rear sleeve rotates to a required position, curing glue is injected into the threaded connection part of the front sleeve and the rear sleeve through the glue injection groove, so that circumferential relative positioning of the front sleeve and the rear sleeve is realized. The contact pin component can realize rapid and accurate fixed-axis debugging of the polarization maintaining optical fiber and has stronger maintainability; the pin component can be conveniently assembled and disassembled in the plug or the socket by matching with the positioning spring and the pressing plate, and the requirement of high extinction ratio can be met after the head seat is plugged.

Description

Polarization maintaining optical fiber connector and pin component thereof

Technical Field

The invention belongs to the field of polarization maintaining optical fiber connectors, and particularly relates to a polarization maintaining optical fiber connector and a contact pin component thereof.

Background

The polarization maintaining optical fiber connector is used as a connector for special application, and is widely applied to optical fiber sensing, interference measurement, planar waveguide, coherent light transmission and long-distance bidirectional light transmission systems; the optical fiber inside the polarization maintaining optical fiber connector is a polarization maintaining optical fiber. The existing polarization-maintaining optical fiber connector on the market has the following problems in the use process: 1. the outer diameter of a polarization maintaining cable connected to the rear end of the connector is limited, and the polarization maintaining cable cannot be compatible with tail accessories of cables with various sizes; 2. the polarization maintaining optical fiber contact element in the connector cannot be easily taken out and disassembled, the connector may need to be integrally replaced when a product is damaged, and the maintenance cost is high; 3. when the two polarization maintaining optical fiber connectors are connected, the two polarization maintaining optical fiber connectors need to be connected through an adapter, and the slow axis alignment error of the polarization maintaining optical fiber is large; in addition, the alignment debugging efficiency of the optical fiber slow axis in the optical fiber connector is low.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a polarization maintaining optical fiber connector and a pin component thereof, which can realize quick removal of the pin component and high-precision quick alignment of a slow axis of an optical fiber.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The pin component comprises a ceramic pin, a front sleeve, a rear sleeve and a spring, wherein the front sleeve and the rear sleeve are in threaded connection to form a cavity for assembling the ceramic pin; the outer wall of the front sleeve is provided with a key for realizing dead axle debugging of the polarization maintaining optical fiber, the front end of the rear sleeve is provided with a clamping jaw, the tail handle is provided with a clamping jaw groove, the clamping jaw is matched with the corresponding clamping jaw groove so that the ceramic contact pin can be driven to synchronously rotate when the rear sleeve rotates, the front sleeve is provided with a glue injection groove, and the glue injection groove is positioned at the threaded connection part of the front sleeve and the rear sleeve; when the rear sleeve rotates to a required position, curing glue is injected into the threaded connection part of the front sleeve and the rear sleeve through the glue injection groove, so that circumferential relative positioning of the front sleeve and the rear sleeve is realized.

Furthermore, the peripheral surface of the rear sleeve is provided with a plane which is convenient to clamp when rotating.

Furthermore, the claws are circumferentially distributed at the front end of the rear sleeve.

The invention also provides a polarization maintaining optical fiber connector which is a socket, wherein the socket comprises a socket shell, a pin component, a positioning spring and a pressing plate, and the pin component is any one of the pin components; the pin component is inserted into the containing hole of the socket shell along the front-back direction, a socket end key groove which is matched with a key on the pin component in a circumferential rotation stopping way is arranged in the socket shell, the positioning spring is arranged in a ring groove arranged in the socket shell, the pressing plate is sleeved on the rear sleeve, and a spring claw of the positioning spring is matched with a step surface on the pressing plate in an axial stopping way so that the pin component is axially positioned between the limiting end surface of the socket shell and the pressing plate; a radial clearance for inserting a removal tool to release the axial blocking relationship between the positioning spring and the pressure plate is arranged between the socket shell and the pressure plate.

Furthermore, the rear sleeve is provided with a flange part which protrudes out of the outer peripheral surface of the front sleeve in the radial direction, and the rear sleeve is in axial stop fit with the limiting end face through the flange part.

Furthermore, the pressing plate is of a sleeve-shaped structure, and an opening which is axially arranged in a penetrating manner and used for avoiding the polarization-maintaining cable is formed in the pressing plate; the front end of the pressure plate is provided with a flange, the front end surface of the flange is used for being in axial stop fit with the rear end surface of the rear sleeve flange, and the rear end surface of the flange is the step surface matched with the positioning spring.

Furthermore, the outer peripheral surface of the front end of the socket shell is provided with a first external thread matched with a connecting nut of the plug, and the outer peripheral surface of the rear end of the socket shell is provided with a second external thread connected with an accessory at the tail of the socket.

The invention also provides another polarization maintaining optical fiber connector, which is a plug, wherein the plug comprises a connecting nut, a plug shell, a threaded sleeve, a ceramic sleeve, a pin component, a positioning spring and a pressing plate, and the pin component is the pin component in the claim 1 or 2; the pin component is inserted into the containing hole of the plug shell along the front-back direction, a plug end key groove which is matched with a key on the pin component in a circumferential rotation stopping way is arranged in the plug shell, the positioning spring is arranged in a ring groove arranged in the plug shell, the pressing plate is sleeved on the rear sleeve, and a spring claw of the positioning spring is matched with a step surface on the pressing plate in an axial stopping way so that the pin component is axially positioned between a limiting end surface arranged in the plug shell and the pressing plate; a radial clearance for inserting a removal tool to release the axial blocking relationship between the positioning spring and the pressure plate is arranged between the plug shell and the pressure plate; the ceramic sleeve is arranged in the threaded sleeve, the threaded sleeve is connected in the plug shell in a threaded mode, and the front end of the ceramic contact pin extends into the ceramic sleeve.

Furthermore, the front end of the threaded sleeve is provided with an end face groove, and the outer wall of the threaded sleeve is provided with a limit table extending in the circumferential direction.

Furthermore, the pressing plate is of a sleeve-shaped structure, and an opening which is axially arranged in a penetrating manner and used for avoiding the polarization-maintaining cable is formed in the pressing plate; the front end of the pressing plate is provided with a flange, the rear end face of the flange is the step face matched with the positioning spring, and a boss matched with the rear sleeve in an axial stop manner is arranged in the pressing plate.

Furthermore, the outer peripheral surface of the rear end of the plug shell is provided with plug tail external threads for connecting plug tail accessories.

The pin component designed by the invention can realize rapid and accurate fixed-axis debugging of the polarization maintaining optical fiber and has stronger maintainability. The contact pin component can be used as a contact element in a plug or a socket, the contact pin component is directly pushed into a connector shell body relative to the contact pin component during installation, the contact pin component is fixed in the plug or the socket through the positioning spring, and a standard taking and installing tool can be used for taking out the contact pin component, so that the connector is convenient to detect and maintain, and the use, installation and maintenance of a user are convenient. In the plug designed by the invention, the plug shell is of an integrated structure, the ceramic pins at the two ends of the head seat are butted in the inner cavity of the plug shell, and the ceramic pin contact element is matched with the high-precision key groove in the inner cavity of the connector shell to realize circumferential positioning, so that the requirement of high extinction ratio is met. In addition, the tail parts of the plug and the socket shell are provided with external threads, so that various tail-attached component forms can be connected, and the connection of a polarization-maintaining cable with the diameter of phi 3 can be realized.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic cross-sectional view of a polarization maintaining fiber connector according to a first embodiment of the invention.

Fig. 2 is a schematic structural view of a pin member of the present invention.

Fig. 3 is a cross-sectional view of the pin assembly of the present invention.

Fig. 4 is a schematic cross-sectional view of a polarization maintaining optical fiber connector according to a second embodiment of the invention.

FIG. 5 is a schematic view of the engagement of the tail handle at the rear end of the ceramic ferrule with the rear sleeve of the present invention.

Fig. 6 is a perspective view of a platen in the present invention.

Detailed Description

The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments.

It should be understood that the terms "first," "second," and the like, as used in the description and in the claims of the present invention, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "front", "back", "up", "down", and the like in the present invention are used for convenience of description, and are not limited to a specific direction or a specific position.

The first embodiment of the polarization maintaining optical fiber connector:

referring to fig. 1 to 3 and 5 to 6, in the present embodiment, the polarization maintaining fiber connector is a socket, and the opposite insertion end of the socket is defined as the front end of the socket, the socket 100 includes a socket housing 1, a pin member 2, a positioning spring 3 and a pressing plate 4, the pin member 2 is inserted into an accommodating hole 11 of the socket housing 1 along the front-back direction, and a socket end key slot 12 extending in the front-back direction is disposed in the accommodating hole. The inner wall of the socket shell 1 is provided with a ring groove for accommodating the positioning spring 3, the positioning spring is annular and is provided with a spring claw bent inwards, and the socket shell 1 is internally provided with a limiting end face 13 for limiting the forward separation of the contact pin component 2. During installation, the pin inserting component is pushed into the socket shell from back to front, the pressing plate 4 is installed at the rear end of the pin inserting component, and the spring claw of the positioning spring is in stop fit with the pressing plate backwards so that the pin inserting component is axially positioned between the limiting end face 13 and the pressing plate 4. A radial gap 5 is formed between the socket shell 1 and the pressure plate 4; when the pin is taken out, the taking-out tool is inserted into the radial gap 5 between the socket shell and the pressing plate, the spring claw of the positioning spring is jacked up, the spring claw is higher than the step surface 41 of the pressing plate 4 in the radial direction, the axial blocking relation between the step surface and the spring claw is removed, and the pin component can be smoothly taken out.

The pin component 2 comprises a ceramic pin 6, a front sleeve 7, a rear sleeve 8 and a spring 9, the front sleeve 7 and the rear sleeve 8 are connected end to form a cavity for assembling the ceramic pin, the rear end of the ceramic pin 6 is sleeved with a tail handle 61, the tail handle 61 and the ceramic pin 6 can be in strong assembly fit, the spring 9 is sleeved outside the tail handle 61, the spring 9 abuts against between an inner end face 81 of the rear sleeve and the rear end face of the tail handle 61, and the spring is used for providing elastic force for pressing the tail handle 61 on the rear end face of an inner boss 71 of the front sleeve 7. When the head base is inserted, the floating butt joint of the ceramic pins in the two ends of the head base is realized through the compression of the spring. The front end of the ceramic contact pin 6 extends forwards out of the front sleeve and is suspended in the insertion cavity at the front end of the socket shell, and the polarization-maintaining optical fiber in the polarization-maintaining cable passes through the inner hole of the tail handle 61 and then penetrates into the ceramic contact pin 6. In this embodiment, the front sleeve 7 and the rear sleeve 8 are connected by a screw thread, that is, the outer circumferential surface of the rear sleeve 8 and the inner circumferential surface of the front sleeve are provided with a matching screw thread. The outer wall of the front sleeve 7 is provided with a key 72 extending in the front-back direction, and the key 72 is matched with the socket end key groove 12 to realize the circumferential limiting of the pin insertion part, so that the assembling guiding and radial rotation stopping functions of the pin insertion part are realized. The front end of the rear sleeve 8 is provided with a claw 82 extending forwards, and correspondingly, the tail handle 61 is provided with a claw groove 611 for inserting the corresponding claw. The claws 82 may be provided in plural and circumferentially distributed at the front end of the rear cover. Through the cooperation of jack catch and jack catch groove, drive the synchronous circumferential direction of ceramic contact pin when making back cover 8 rotatory. Be equipped with injecting glue groove 73 on the front cover 7, injecting glue groove 73 can be U type groove, and injecting glue groove 73 radially runs through in the front cover setting, and injecting glue groove 73 locates the threaded connection department of front cover and back cover. The peripheral surface of the rear sleeve 8 is provided with a plane 83 which is used for facilitating clamping in the process of realizing dead axle debugging at a rotating angle; the rear sleeve and the ceramic contact pin are coaxially arranged.

Taking the polarization maintaining fiber as a panda-type fiber as an example, the panda eye of the panda-type fiber needs to be aligned with the key 72 in the manufacturing process. Specifically, in the debugging process, the front sleeve is fixed on debugging equipment, then the key on the front sleeve is positioned in the circumferential direction, the rear sleeve 8 is rotated to further drive the tail handle and the ceramic contact pin to rotate in the circumferential direction, so that the angle of the polarization maintaining optical fiber inside the ceramic contact pin is adjusted, the position relation between the slow axis of the optical fiber and the key is observed through image detection equipment, when the included angle between the slow axis of the polarization maintaining optical fiber and the key meets the production design requirement, the ceramic contact pin does not need to be taken down on the debugging equipment, curing glue is directly injected through the glue injection groove 73 of the front sleeve, the threaded connection part of the front sleeve and the rear sleeve is bonded, and the curing glue can permeate into the gap of the threaded connection part to play a circumferential anti-loosening effect between the front sleeve and the rear sleeve. As an extension, if the included angle between the slow shaft and the key exceeds the design range after the fixed shaft is debugged, or the included angle between the slow shaft and the key exceeds the design range due to the fact that the front sleeve and the rear sleeve rotate circumferentially relatively in the using process, the threaded connection part of the front sleeve and the rear sleeve can be heated to soften glue, so that the circumferential angle of the rear sleeve can be adjusted again, and the maintenance or the maintenance of the pin inserting component is facilitated.

In this embodiment, the flange portion 84 of the rear sleeve 8 is axially in stop fit with the limiting end face 13, so as to prevent the pin inserting component from being pulled out forwards; namely, the flange part of the rear sleeve slightly protrudes out of the peripheral surface of the front sleeve in the radial direction, so that the axial limit matching with the limit end surface can be realized. The peripheral surface of front cover and socket shell are in the spacing cooperation of footpath, prevent that the contact pin part is radial drunkenness. The pressing plate 4 is of a sleeve-shaped structure, and is provided with an opening 42 which is axially arranged in a penetrating way and is used for avoiding a polarization-maintaining cable connected with the tail part of the connector when the pressing plate is installed; if the opening 42 is not arranged, the pressing plate is required to be sleeved on the cable in advance; the front end of the pressure plate is provided with a flange 43, the front end surface of the flange is used for being in axial stop fit with the rear end surface of the rear sleeve flange, and the rear end surface of the flange is the step surface 41 matched with the positioning spring. The flange is in limited fit with the inner wall of the accommodating hole of the socket in the radial direction, and the radial position of the pin component can also be positioned.

The front end outer peripheral face of socket casing 1 is equipped with the first external screw thread 14 of connecting nut complex with the plug end, and the rear end outer peripheral face of socket casing is equipped with the second external screw thread 15 of being connected with socket afterbody annex, and socket afterbody annex include the polarization maintaining cable and with second external screw thread complex nut, owing to adopt screw-thread fit, then socket afterbody annex can carry the great polarization maintaining cable of diameter range, if realize the connection of diameter polarization maintaining cable more than phi 3.

Second embodiment of polarization-maintaining fiber connector:

referring to fig. 2 to 6, in the present embodiment, the polarization maintaining optical fiber connector is a plug 200, and the opposite insertion end of the plug is defined as the front end thereof, the plug includes a connection nut 201, a plug housing 202, a threaded sleeve 203, a ceramic sleeve 204, a pin member 2, a positioning spring 3, and a pressing plate 4, and the connection nut is rotatably assembled at the outer side of the plug housing and is used for cooperating with the first external thread 14 of the socket to achieve the insertion and locking of the header. The ferrule member 2 has the same structure as the ferrule member described in the first embodiment of the polarization maintaining optical fiber connector, and also includes a ceramic ferrule 6, a front sleeve 7, a rear sleeve 8, a spring 9, and a tail 61, which are not described herein again. Of course, the fixed axis debugging process of the polarization maintaining optical fiber in the plug is also the same as that of the socket end.

At the plug end, the pin member 2 is inserted into the receiving hole of the plug housing along the front-rear direction, a plug end key groove 2021 extending in the front-rear direction is provided in the plug housing 202, and the plug end key groove is used for being matched with the key of the pin member to realize circumferential limitation of the pin member. The inner wall of the plug shell is also provided with a ring groove for accommodating the positioning spring 3; the plug housing 202 is provided with a limiting surface 2022 for limiting the pin members therein to be separated forwards. During installation, the pin component is pushed into the plug shell from back to front, the pressing plate 4 is sleeved on the rear sleeve at the tail of the pin component, and the spring claw of the positioning spring 3 is matched with the step surface 41 of the pressing plate so that the pin component is axially positioned between the limiting surface 2022 and the pressing plate 4. A radial gap 5 is formed between the plug shell and the pressure plate; when the pin is taken out, the taking-out tool is inserted into the radial gap and jacks up the spring claw, so that the axial blocking relation between the step surface and the spring claw is released, and the pin inserting component can be taken out smoothly.

The ceramic bushing 204 is installed in the threaded bushing 203, the threaded bushing can prevent the ceramic bushing from being separated forwards, the threaded bushing 203 is in threaded connection with the plug shell 20, the front end of the ceramic pin 6 in the plug is located in the ceramic bushing, the ceramic pins of the opposite plug ends are located in the ceramic bushing in the socket plugging state, and the ceramic bushing is used for improving the coaxiality and the butt joint strength of the ceramic pins of the opposite plug ends. The front end of the threaded sleeve 203 is provided with an end face groove 2031, and during installation, a tool goes deep into the end face groove to drive the threaded sleeve to rotate, so that the external thread of the threaded sleeve is matched with the internal thread of the plug shell, and the threaded sleeve and the ceramic sleeve are inserted into the plug shell from front to back. The outer wall of the threaded sleeve is provided with a circumferentially extending limiting table 2032 for being matched with the plug shell in a backward stop manner to realize the assembly limiting of the threaded sleeve.

The rear end of the plug shell is provided with plug tail external threads 2023 for connecting plug tail accessories, the diameter of the polarization-maintaining cable in the plug tail accessories can be selected in a wide range, and the connection of the polarization-maintaining cable with the diameter of over phi 3 can be realized. Furthermore, at the plug end, the form of the pressure plate 4 may be changed, and referring to fig. 4, the rear end surface of the rear sleeve is engaged with the boss 44 inside the pressure plate 4, and the opening 42 axially opened through the pressure plate may be used to avoid the key 72, which is advantageous for shortening the overall length of the plug.

Pin member embodiment:

in this embodiment, the pin component is the pin component described in the first embodiment or the second embodiment of the polarization maintaining fiber connector, and details are not described here.

The pin member described in this embodiment may be mounted in a connector housing to form a polarization maintaining optical connector, and the connector housing is not limited to the structure shown in the above plug or socket embodiments.

Examples of polarization maintaining fiber connector assemblies:

the polarization maintaining optical fiber connector assembly comprises a plug and a socket, wherein the plug and the socket are connected in a matched and inserted mode at the front end, the plug is the plug in the first embodiment of the polarization maintaining optical fiber connector, and the socket is the socket in the second embodiment of the polarization maintaining optical fiber connector, and the details are not repeated here.

As an expansion, the structure for realizing the insertion locking of the headstock is not limited to the threaded connection, and in other embodiments, the headstock can adopt other locking structures such as a bayonet structure and a steel ball locking structure.

The foregoing is only a preferred embodiment of the present invention and is not detailed in the prior art; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made within the technical scope of the present invention.

Claims (10)

1. A pin member, characterized in that: the rear end of the ceramic contact pin is sleeved with a tail handle, the spring is sleeved on the tail handle, the spring is abutted between the inner end face of the rear sleeve and the rear end face of the tail handle, and the spring is used for providing elastic force for pressing the tail handle on the rear end face of an inner boss of the front sleeve; the outer wall of the front sleeve is provided with a key for realizing fixed-axis debugging of the polarization maintaining optical fiber, the front end of the rear sleeve is provided with a clamping jaw, the tail handle is provided with a clamping jaw groove, the clamping jaw is matched with the corresponding clamping jaw groove so that the ceramic contact pin can be driven to synchronously rotate when the rear sleeve rotates, the front sleeve is provided with a glue injection groove, and the glue injection groove is positioned at the threaded connection part of the front sleeve and the rear sleeve; when the rear sleeve rotates to a required position, curing glue is injected into the threaded connection part of the front sleeve and the rear sleeve through the glue injection groove, so that circumferential relative positioning of the front sleeve and the rear sleeve is realized.

2. A pin member as recited in claim 1, wherein: the outer peripheral surface of the rear sleeve is provided with a plane which is convenient to clamp when rotating.

3. The polarization maintaining optical fiber connector is characterized in that: the socket comprises a socket shell, a pin component, a positioning spring and a pressure plate, wherein the pin component is the pin component in claim 1 or 2; the pin component is inserted into the containing hole of the socket shell along the front-back direction, a socket end key groove which is matched with a key on the pin component in a circumferential rotation stopping way is arranged in the socket shell, the positioning spring is arranged in a ring groove arranged in the socket shell, the pressing plate is sleeved on the rear sleeve, and a spring claw of the positioning spring is matched with a step surface on the pressing plate in an axial stopping way so that the pin component is axially positioned between the limiting end surface of the socket shell and the pressing plate; a radial clearance for inserting a removal tool to release the axial blocking relationship between the positioning spring and the pressure plate is arranged between the socket shell and the pressure plate.

4. The polarization maintaining fiber connector of claim 3, wherein: the rear sleeve is provided with a flange part which protrudes out of the peripheral surface of the front sleeve in the radial direction, and the rear sleeve is in axial stop fit with the limiting end surface through the flange part.

5. The polarization maintaining fiber connector of claim 3, wherein: the pressing plate is of a sleeve-shaped structure and is provided with an opening which is axially arranged in a penetrating manner and used for avoiding the polarization-maintaining cable; the front end of the pressure plate is provided with a flange, the front end surface of the flange is used for being in axial stop fit with the rear end surface of the rear sleeve flange, and the rear end surface of the flange is the step surface matched with the positioning spring.

6. The polarization maintaining fiber connector of claim 3, wherein: the outer peripheral surface of the front end of the socket shell is provided with a first external thread matched with a connecting nut of the plug, and the outer peripheral surface of the rear end of the socket shell is provided with a second external thread connected with an accessory at the tail part of the socket.

7. The polarization maintaining optical fiber connector is characterized in that: the plug comprises a connecting nut, a plug shell, a threaded sleeve, a ceramic sleeve, a pin component, a positioning spring and a pressing plate, wherein the pin component is the pin component in claim 1 or 2; the pin component is inserted into the accommodating hole of the plug shell along the front-back direction, a plug end key groove which is in circumferential rotation-stopping fit with a key on the pin component is arranged in the plug shell, the positioning spring is arranged in a ring groove arranged in the plug shell, the pressing plate is sleeved on the rear sleeve, and a spring claw of the positioning spring is in axial stop fit with a step surface on the pressing plate so that the pin component is axially positioned between a limiting end surface arranged in the plug shell and the pressing plate; a radial clearance for inserting a removal tool to release the axial blocking relationship between the positioning spring and the pressure plate is arranged between the plug shell and the pressure plate; the ceramic sleeve is arranged in the threaded sleeve, the threaded sleeve is connected in the plug shell in a threaded mode, and the front end of the ceramic contact pin extends into the ceramic sleeve.

8. The polarization maintaining fiber connector of claim 7, wherein: the front end of the threaded sleeve is provided with an end face groove, and the outer wall of the threaded sleeve is provided with a limit table extending in the circumferential direction.

9. The polarization maintaining fiber connector of claim 7, wherein: the pressing plate is of a sleeve-shaped structure and is provided with an opening which is axially arranged in a penetrating manner and used for avoiding the polarization-maintaining cable; the front end of the pressing plate is provided with a flange, the rear end face of the flange is the step face matched with the positioning spring, and a boss matched with the rear sleeve in an axial stop manner is arranged in the pressing plate.

10. The polarization maintaining fiber connector of claim 7, wherein: the outer peripheral surface of the rear end of the plug shell is provided with plug tail external threads for connecting plug tail accessories.

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