CN217932172U - Optical connector and optical connection system - Google Patents

Abstract

The utility model relates to an optical connection technical field specifically discloses an optical connector and optical connection system. The optical connector comprises an end ferrule, a front shell sleeve and a rear shell sleeve; the end socket is sleeved on the optical fiber main body at one end of the optical fiber cable; the front shell sleeve and the rear shell sleeve are spliced, a containing cavity is formed after the front shell sleeve and the rear shell sleeve are spliced, the extending direction of the containing cavity is the same as the length direction of the optical fiber cable, an avoiding hole is formed in the cavity bottom of the containing cavity, a stop sleeve, an elastic piece and an end socket insert are arranged in the containing cavity, and the elastic piece and the stop sleeve are sleeved on the optical fiber cable; the two ends of the elastic piece are fixedly connected with the end inserting core and the stop sleeve respectively, the elastic piece can drive the end inserting core and enable the end inserting core to be abutted against the cavity bottom of the containing cavity, the end inserting core partially penetrates through the avoiding hole, the stop sleeve is fixedly connected to the cavity top of the containing cavity, and the optical fiber cable partially extends out of the cavity top of the containing cavity. The structural improvement of the optical connector ensures the structural stability, improves the assembly efficiency and reduces the manufacturing difficulty.

Description

Optical connector and optical connection system

Technical Field

The utility model relates to an optical connection technical field especially relates to an optical connector and optical connection system.

Background

In the field of optical communications, there are many types of fiber optic connectors that vary in application. Among them, the FC (Ferrule Connector) Connector is a type of Connector used for interconnection between optical devices.

The conventional FC connector is produced and assembled by adopting a mode that metal parts are connected through threads, and the labor and materials are consumed. In order to avoid the influence on the FC connector caused by vibration or manual disassembly, thread glue is added to parts assembled by threads for fastening.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an optical connector and optical connection system to solve optical connector and assemble difficulty, the unstable problem of structure.

To achieve the purpose, the utility model adopts the following technical proposal:

an optical connector comprises an end ferrule, a front shell sleeve and a rear shell sleeve; the end socket is sleeved on the optical fiber main body, and the optical fiber main body is positioned at one end of the optical fiber cable; the front shell sleeve and the rear shell sleeve are spliced, a containing cavity is formed after the front shell sleeve and the rear shell sleeve are spliced, the extending direction of the containing cavity is the same as the length direction of the optical fiber cable, an avoiding hole is formed in the cavity bottom of the containing cavity, a stop sleeve, an elastic piece and the end plug core are arranged in the containing cavity, and the elastic piece and the stop sleeve are both sleeved on the optical fiber cable; the two ends of the elastic piece are fixedly connected with the end inserting core and the stop sleeve respectively, the elastic piece can drive the end inserting core and enable the end inserting core to abut against the cavity bottom of the containing cavity, the end inserting core partially penetrates through the avoiding hole, the stop sleeve is fixedly connected with the cavity top of the containing cavity, and the optical fiber cable partially extends out of the cavity top of the containing cavity.

As optical connector's preferred technical scheme, preceding shell cover is equipped with first shell cover groove, dodge the hole and set up in the tank bottom in first shell cover groove, the back shell cover is equipped with the third holding tank, third holding tank intercommunication has the intercommunicating pore, first shell cover groove with the third holding tank all is located accomodate the intracavity, the chamber top of accomodating the chamber is passed through intercommunicating pore and external environment condition intercommunication.

As the preferred technical scheme of optical connector, the outer peripheral edges of back shell cover are equipped with at least one public fastener, the internal perisporium of preceding shell cover is equipped with female fastener, female fastener with public fastener quantity is the same and one-to-one, public fastener can with female fastener buckle connection.

As a preferable technical solution of the optical connector, at least one guide key is provided on an outer peripheral edge of the rear shell, a guide groove is provided on an inner peripheral wall of the front shell, the guide keys and the guide grooves have the same number and are in one-to-one correspondence, an extending direction of each of the guide keys and the guide grooves is the same as an extending direction of the receiving cavity, and the guide keys can be fitted to the guide keys.

As the preferable technical scheme of the optical connector, the optical connector further comprises a dustproof cap, and the dustproof cap is sleeved on the part of the end socket penetrating through the avoiding hole.

As a preferable technical solution of the optical connector, the stop sleeve partially extends out of the top of the receiving cavity, and the optical connector further includes a tail sleeve, and the tail sleeve is sleeved on the portion of the stop sleeve extending out of the top of the receiving cavity.

An optical connection system includes a connection device and the above optical connector selectively connected to a connection port of the connection device.

As a preferable embodiment of the optical connection system, the connection device includes a positioning ring, an outer side surface of the positioning ring is provided with an external thread, the optical connector includes a nut sleeve, the nut sleeve is fitted over the front shell sleeve and the rear shell sleeve and is slidable in an extending direction of the storage chamber, an inner side surface of the nut sleeve is provided with an internal thread, and the external thread is threadably engaged with the internal thread.

As a preferable technical solution of the optical connection system, a limiting layer is convexly disposed on an outer side surface of the rear shell, a limiting protrusion is disposed on an inner side surface of the nut sleeve, and when the nut sleeve slides along an extending direction of the accommodating cavity, the nut sleeve is stopped by the limiting protrusion to abut against an end surface of the front shell, or the limiting protrusion abuts against an end surface of the limiting layer.

As a preferred technical solution of the optical connection system, the connection device is provided with a positioning groove, the front shell is provided with a positioning key in a protruding manner, and the positioning key can be embedded in the positioning groove.

The utility model has the advantages that:

this optical connector has reduced the degree of difficulty of accomodating the chamber formation through the mode of preceding shell and back shell concatenation, has promoted the efficiency that operating personnel maintained the component of accomodating the intracavity. The optical fiber cable and the two ends of the elastic piece are respectively and fixedly connected with the end plug core and the stop sleeve through the elastic piece and the stop sleeve, so that the space occupied by the elastic piece is reduced, the risk of position deviation of the elastic piece is reduced, and the positioning effect of the end plug core in the accommodating cavity is ensured. The design that the end ferrule is limited in the containing cavity by means of the elastic piece reduces the risk of damage of the end ferrule in the working process, prolongs the service life of the end ferrule and ensures the smooth operation of the optical connector. The improved structure changes the connection mode of the front shell and the rear shell, saves the anti-dismantling design of the optical connector, removes the requirements on bonding materials such as thread glue and the like, reduces the production difficulty, improves the manufacturing efficiency, and greatly reduces the workload of operators.

Drawings

Fig. 1 is a schematic structural diagram of an optical connector according to an embodiment of the present invention;

fig. 2 is an exploded view of an optical connector provided by an embodiment of the present invention;

fig. 3 is a cross-sectional view of an optical connector according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a front shell according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a rear shell cover according to an embodiment of the present invention.

In the figure:

100. a dust cap; 200. a front shell sleeve; 201. avoiding holes; 202. a first mounting groove; 203. a first accommodating groove; 204. a second accommodating groove; 210. a positioning key; 220. a female snap fastener; 230. a guide groove; 300. a nut sleeve; 310. a friction layer; 400. inserting an end socket; 410. a core insertion member; 420. pressing a sleeve; 500. an elastic member; 600. a rear shell sleeve; 601. a communicating hole; 602. a third accommodating groove; 603. a first keyway; 604. a second mounting groove; 605. pressing and connecting the bulges; 610. dispensing through holes; 620. a guide key; 630. a male snap fastener; 700. A stop sleeve; 800. a tail sleeve; 810. a deformation groove; 900. a fiber optic cable; 910. an optical fiber body.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The present embodiment provides an optical connection system including a connection device and an optical connector selectively connected to a connection port of the connection device. The connection mode is simple and reliable, and is easy to disassemble and assemble and convenient to operate.

As shown in fig. 1 to 4, the present embodiment further provides an optical connector, which includes a tip ferrule 400, a front shell 200, and a rear shell 600; the end plug core 400 is sleeved on the optical fiber main body 910, and the optical fiber main body 910 is positioned at one end of the optical fiber cable 900; the front shell sleeve 200 and the rear shell sleeve 600 are spliced, a containing cavity is formed after the front shell sleeve 200 and the rear shell sleeve 600 are spliced, the extending direction of the containing cavity is the same as the length direction of the optical fiber cable 900, an avoiding hole 201 is formed in the cavity bottom of the containing cavity, a stop sleeve 700, an elastic piece 500 and an end plug core 400 are arranged in the containing cavity, and the elastic piece 500 and the stop sleeve 700 are both sleeved on the optical fiber cable 900; the two ends of the elastic member 500 are respectively and fixedly connected to the end plug core 400 and the stop sleeve 700, the elastic member 500 can drive the end plug core 400 to enable the end plug core 400 to abut against the cavity bottom of the accommodating cavity, the end plug core 400 partially penetrates through the avoiding hole 201, the stop sleeve 700 is fixedly connected to the cavity top of the accommodating cavity, and the optical fiber cable 900 partially extends out of the cavity top of the accommodating cavity.

This optical connector has reduced the degree of difficulty of accomodating the chamber formation through the mode of preceding shell 200 and the concatenation of back shell 600, has promoted the efficiency that operating personnel maintained the component of accomodating the intracavity. Through the design that the optical fiber cable 900 is sleeved with the elastic piece 500 and the two ends of the elastic piece 500 are fixedly connected with the end plug core 400 and the stop sleeve 700 respectively, the space occupied by the elastic piece 500 is reduced, the risk of position deviation of the elastic piece 500 is reduced, and the positioning effect of the end plug core 400 in the accommodating cavity is guaranteed. The design of limiting the end ferrule 400 in the accommodating cavity by means of the elastic member 500 reduces the risk of damage to the end ferrule 400 during the working process, prolongs the service life of the end ferrule 400, and ensures the smooth operation of the optical connector. The improved structure changes the connection mode of the front shell sleeve 200 and the rear shell sleeve 600, saves the anti-dismantling design of the optical connector, removes the requirements on bonding materials such as thread glue and the like, reduces the production difficulty, improves the manufacturing efficiency, and greatly reduces the workload of operators.

Specifically, the elastic member 500 is a spring.

In this embodiment, the stub ferrule 400 includes a ferrule piece 410 and a pressing sleeve 420, the ferrule piece 410 is a cylinder, a blind installation hole having the same extending direction as the ferrule piece 410 is formed on an end surface of the ferrule piece 410, the optical fiber main body 910 is inserted into the blind installation hole, the pressing sleeve 420 is sleeved on the optical fiber cable 900, and one end of the ferrule piece 410 having the blind installation hole is engaged with the pressing sleeve 420. The split design of the end ferrule 400 reduces the difficulty of production, ensures the stable connection between the end ferrule 400 and the optical fiber cable 900, ensures the smooth completion of the optical connection between the optical fiber main body 910 and the connecting device, and improves the efficiency of the dismounting connection between the optical fiber cable 900 and the end ferrule 400. Specifically, the material of the pressing sleeve 420 is metal, and the optical fiber main body 910 is fixedly installed in the installation blind hole through glue.

In this embodiment, preceding shell cover 200 is equipped with first shell cover groove, dodges hole 201 and offers the tank bottom in first shell cover groove, and back shell cover 600 is equipped with third holding tank 602, and third holding tank 602 intercommunication has intercommunicating pore 601, and first shell cover groove and third holding tank 602 all are located accomodates the intracavity, accomodate the chamber top in chamber and pass through intercommunicating pore 601 and external environment condition intercommunication. The structure of accomodating the chamber has been optimized in above design for stop sleeve 700 rigid coupling in the chamber top of accomodating the chamber and end lock pin 400 and the design of accomodating the chamber end of chamber and leaning on can realize, can also guarantee that end lock pin 400 can partly pass dodge hole 201, and the optical fiber cable 900 part stretches out the chamber top of accomodating the chamber. The structure is simple and reliable, the risk of position deviation between the stop sleeve 700 and the end plug core 400 is reduced, and the space occupied by the optical connector is reduced.

In this embodiment, the stop sleeve 700 partially extends out of the top of the receiving cavity, and the optical connector further includes a tail sleeve 800, wherein the tail sleeve 800 is sleeved on the portion of the stop sleeve 700 extending out of the top of the receiving cavity. The setting of tail cover 800 can inject the crooked radian that fiber cable 900 stretches out the portion of accomodating the chamber top, has avoided fiber cable 900 to produce great bending loss after the bending, reduces the risk of fiber cable 900 damage by a wide margin. Specifically, the outer circumference of the tail sleeve 800 is provided with a deformation groove 810. The provision of the deformation slots 810 improves the deformability of the boot 800 such that the boot 800 can be bent along with the optical fiber cable 900.

As shown in fig. 3 and 5, the locking sleeve 700 is in contact with the groove bottom of the third receiving groove 602, four first key grooves 603 are circumferentially and uniformly distributed on the inner peripheral wall of the communication hole 601, four first mounting keys are circumferentially and uniformly distributed on the outer peripheral edge of the locking sleeve 700, and when the locking sleeve 700 is mounted in the third receiving groove 602, the four first mounting keys are fitted in the four first key grooves 603 in a one-to-one correspondence manner. Above-mentioned structural design has guaranteed the stable installation of stop sleeve 700 in third holding tank 602, has restricted the upwarp of stop sleeve 700 to rock, has made things convenient for operating personnel to control the compression degree of elastic component 500 through the mode of changing stop sleeve 700, and then makes the thrust of elastic component 500 drive end lock pin 400 control.

In this embodiment, the rear housing 600 is further provided with a second mounting groove 604, the third receiving groove 602 is communicated with the second mounting groove 604 through the communicating hole 601, the tail sleeve 800 is partially penetrated into the second mounting groove 604, the inner peripheral wall of the second mounting groove 604 is convexly provided with a crimping protrusion 605, and the crimping protrusion 605 realizes the positioning effect on the tail sleeve 800 by pressing the outer peripheral edge of the tail sleeve 800. The inner peripheral wall of the second mounting groove 604 is provided with a dispensing through hole 610, the dispensing through hole 610 communicates with the external environment and the second mounting groove 604, and the stop sleeve 700 can be fixedly connected to the rear housing 600 by glue in a dispensing manner in the second mounting groove 604. The second mounting groove 604 is formed to avoid the assembling position of the stop sleeve 700, so that enough operating space is reserved for the dispensing operation, and the dispensing operation can be accurately and properly performed.

Specifically, the end of the rear housing 600 away from the front housing 200 is provided with a grip, and when the optical connection system is assembled, an operator connects the optical connector to the connection port by gripping the grip. The arrangement of the holding part facilitates the assembly operation of operators and improves the assembly efficiency.

With reference to fig. 1 to 3, at least one male snap 630 is disposed on the outer periphery of the rear housing 600, female snaps 220 are disposed on the inner periphery of the front housing 200, the female snaps 220 correspond to the male snaps 630 in the same number, and the male snaps 630 can be connected to the female snaps 220. The male snap 630 is matched with the female snap 220 to realize the snap connection of the rear shell 600 and the front shell 200, and the structure is simple and reliable, the assembly and disassembly are convenient, and the manufacturing cost is low. Specifically, the male snap 630 is a snap protrusion, the female snap 220 is a snap groove, and the snap protrusion and the snap groove are both provided with two.

In this embodiment, at least one guide key 620 is disposed on the outer periphery of the rear housing 600, the guide grooves 230 are disposed on the inner periphery of the front housing 200, the number of the guide keys 620 is the same as that of the guide grooves 230, the guide keys 620 correspond to the guide grooves 230 one by one, the extending directions of the guide keys 620 and the guide grooves 230 are the same as that of the accommodating cavities, and the guide keys 620 can be engaged with the guide keys 620. The arrangement of the guide key 620 and the guide groove 230 is such that the assembly of the rear shell 600 on the front shell 200 plays a guiding role, the difficulty of assembling the male snap 630 in the female snap 220 is reduced, and the manufacturing efficiency of the optical connector is improved.

In this embodiment, the sectional area of the guiding key 620 gradually decreases in the direction toward the front housing 200, and the above design reduces the difficulty of assembling the guiding key 620 into the guiding groove 230, thereby further improving the assembling efficiency of the optical connector.

Specifically, the guide groove 230 has an elastic deformation capability. Due to the design, when the rear shell 600 is assembled, a certain deformation space is provided for the front shell 200, and the situation that the front shell 200 is broken due to the fact that the front shell is expanded is avoided.

Preferably, the optical connector further includes a dust cap 100, and the dust cap 100 is sleeved on a portion of the ferrule 400 passing through the avoiding hole 201. The arrangement of the dust cap 100 ensures the protection effect on the plug element 410, reduces the risk of damage to the optical connector, and prolongs the service life.

As shown in fig. 3 and 4, the front shell 200 is further provided with a first mounting groove 202, an extending direction of the first mounting groove 202 is the same as an extending direction of the first shell groove, and the first mounting groove 202 is communicated with the first shell groove through an avoiding hole 201. When the dust cap 100 is assembled on the tip ferrule 400, the dust cap 100 is inserted into the first mounting groove 202. The arrangement of the first mounting groove 202 ensures the positioning effect of the dust cap 100, and further improves the stability of the optical connector structure.

Further, first shell cover groove includes first holding tank 203 and the second holding tank 204 of coaxial intercommunication, and first holding tank 203 with dodge hole 201 and be linked together, female buckle spare 220 and guide way 230 all set up on the internal perisporium of second holding tank 204.

With continued reference to fig. 1-3, the connection device is provided with a positioning ring, an outer side surface of the positioning ring is provided with an external thread, the optical connector comprises a nut sleeve 300, the nut sleeve 300 is sleeved on the front shell 200 and the rear shell 600, the nut sleeve 300 can slide along the extension direction of the accommodating cavity, an inner side surface of the nut sleeve 300 is provided with an internal thread, and the external thread can be screwed with the internal thread. The thread combination of the external thread and the internal thread ensures the stable connection of the connecting equipment and the optical connector and ensures the smooth operation of the optical connection system. The design that the nut case 300 is sleeved on the front case 200 and the rear case 600 can play a role in protecting the front case 200 and the rear case 600. The design that nut cover 300 can slide has made things convenient for operating personnel to find the equipment position accurately in the assembling process, has promoted the efficiency of equipment.

Specifically, the friction layer 310 is disposed on the outer periphery of the nut sleeve 300, and the friction layer 310 facilitates the screwing action of the nut sleeve 300 by an operator, improves the assembling efficiency of the optical connector on the connection device, and ensures the stable connection of the optical connector on the connection device.

Furthermore, the outer side surface of the rear shell 600 is convexly provided with a limiting layer, the inner side surface of the nut sleeve 300 is provided with a limiting protrusion, and when the nut sleeve 300 slides along the extending direction of the accommodating cavity, the nut sleeve is stopped to abut against the limiting protrusion and the end surface of the front shell 200, or abut against the limiting layer. The stop design of the front shell 200 and the limit layer can avoid the situation that the nut sleeve 300 is separated, and meanwhile, the design that the limit bulge abuts against the end face of the front shell 200 can also ensure that the insertion core piece 410 can be stably connected with a connection port under the pushing of the nut sleeve 300 when the nut sleeve 300 is screwed on a positioning ring, so that the connection effect of the connection device and the optical connector is further improved.

Preferably, the connecting device is provided with a positioning groove, the front shell 200 is provided with a positioning key 210 in a protruding manner, and the positioning key 210 can be embedded in the positioning groove. The jogged design of the positioning key 210 and the positioning groove plays a guiding effect for the assembly of the optical connector on the connecting equipment, reduces the difficulty of stably connecting the optical connector and the connecting port, and improves the assembly efficiency of the optical connection system.

In another embodiment of this embodiment, the optical connector described above can be used as a point adjusting connector, and by rotating the plug member 410 to a predetermined position, good mating performance can be obtained at the time of mating. For example, when the polarization maintaining connector is used as a polarization maintaining connector, the adjustment of the polarization angle can be completed.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An optical connector, comprising:

the end plug core (400) is sleeved on the optical fiber main body (910), and the optical fiber main body (910) is positioned at one end of the optical fiber cable (900);

the front shell sleeve (200) and the rear shell sleeve (600) are spliced, the front shell sleeve (200) and the rear shell sleeve (600) are spliced to form a containing cavity, the extending direction of the containing cavity is the same as the length direction of the optical fiber cable (900), an avoiding hole (201) is formed in the cavity bottom of the containing cavity, a stop sleeve (700), an elastic piece (500) and the end inserting core (400) are arranged in the containing cavity, and the elastic piece (500) and the stop sleeve (700) are sleeved on the optical fiber cable (900);

the both ends of elastic component (500) respectively the rigid coupling in end lock pin (400) with stop sleeve (700), elastic component (500) can drive end lock pin (400) and make end lock pin (400) with the chamber end of accomodating the chamber is held up, end lock pin (400) part is passed dodge hole (201), stop sleeve (700) rigid coupling in the chamber top of accomodating the chamber, optical fiber cable (900) part is stretched out the chamber top of accomodating the chamber.

2. The optical connector according to claim 1, wherein the front shell (200) is provided with a first shell groove, the avoiding hole (201) is opened at a groove bottom of the first shell groove, the rear shell (600) is provided with a third accommodating groove (602), the third accommodating groove (602) is communicated with a communication hole (601), the first shell groove and the third accommodating groove (602) are both located in the accommodating cavity, and a cavity top of the accommodating cavity is communicated with an external environment through the communication hole (601).

3. The optical connector according to claim 1, wherein the rear housing (600) is provided with at least one male snap (630) at an outer periphery thereof, the front housing (200) is provided with a female snap (220) at an inner periphery thereof, the female snap (220) is the same in number and corresponds to the male snap (630), and the male snap (630) can be connected with the female snap (220) in a snap-fit manner.

4. The optical connector according to claim 1, wherein the rear housing (600) is provided with at least one guide key (620) at its outer periphery, the front housing (200) is provided with guide grooves (230) at its inner peripheral wall, the guide keys (620) are in the same number and one-to-one correspondence with the guide grooves (230), the guide keys (620) and the guide grooves (230) both extend in the same direction as the receiving cavity, and the guide keys (620) are capable of being fitted to the guide keys (620).

5. The optical connector according to any one of claims 1 to 4, further comprising a dust cap (100), wherein the dust cap (100) is sleeved on a portion of the end ferrule (400) passing through the avoiding hole (201).

6. The optical connector of any of claims 1-4, wherein the stop sleeve (700) partially extends out of the top of the receiving cavity, and the optical connector further comprises a tail sleeve (800), wherein the tail sleeve (800) is sleeved on the portion of the stop sleeve (700) extending out of the top of the receiving cavity.

7. An optical connection system comprising a connection device and the optical connector of any one of claims 1-6, the optical connector being selectively connectable to a connection port of the connection device.

8. The optical connection system according to claim 7, wherein the connection device is provided with a positioning ring, an outer side surface of the positioning ring is provided with an external thread, the optical connector comprises a nut sleeve (300), the nut sleeve (300) is sleeved on the front shell (200) and the rear shell (600), the nut sleeve (300) can slide along an extension direction of the receiving cavity, an inner side surface of the nut sleeve (300) is provided with an internal thread, and the external thread can be screwed with the internal thread.

9. The optical connection system of claim 8, wherein a stop layer is protruded from an outer surface of the rear housing (600), a stop protrusion is provided on an inner surface of the nut housing (300), and when the nut housing (300) slides in the extending direction of the receiving cavity, the stop protrusion abuts against an end surface of the front housing (200) or the stop protrusion abuts against an end surface of the stop layer.

10. Optical connection system according to claim 7, characterized in that the connection device is provided with a positioning slot, and the front shell (200) is provided with a positioning key (210) protruding therefrom, the positioning key (210) being able to fit into the positioning slot.

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