Adapter for MT-MT optical fiber jumper connection and MT-MT optical fiber jumper connection method

Abstract

The present invention relates to the technical field of optical fiber jumper connectors, and in particular to an adapter for MT-MT optical fiber jumper connection, comprising an optical fiber jumper assembly and three structural members, namely, an adapter base, an adapter cover plate, and an adapter front cover. The adapter base and the adapter cover plate can constitute a fixed part of the adapter, and are used to fix one of the MT optical contacts, so that the other MT optical contact can be freely plugged with the fixed MT optical contact. After the plugging, the adapter front cover is installed along the plugging direction for fixing. The whole device is formed by high-precision CNC processing, has a simple structure and a small size, can effectively fix the MT optical contact, ensure the connection performance of the MT-MT optical fiber jumper, and is convenient for disassembly and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber jumper connectors, and in particular to an adapter for MT-MT optical fiber jumper connection and an MT-MT optical fiber jumper connection method. Background Art

[0002] Fiber optic patch cords refer to optical cables with connector plugs installed on both ends to achieve active connection of optical paths. Among them, MT fiber optic cables are multi-core ribbon optical cables with high optical signal density, compact size, reliable connection, good consistency of optical performance, strong interchangeability, etc. They are widely used in various usage scenarios such as vehicle-mounted, airborne, and shipborne.

[0003] Since MT-MT fiber optic patch cords often need to be plugged in and interconnected during use, and there are no adapters for MT-MT connector interconnection on the market, different manufacturers use different methods to fix them. Some manufacturers use glue fixation, some manufacturers use structural parts fixation, and even use cable ties or tapes to fix them.

[0004] The above fixing methods are not accurate enough when fixing the plug, and are not completely fixed, which will affect the connection performance of the connector. In addition, some fixing methods are too large in size, wasting the PCB board area. For example, the MT optical fiber connector with publication number CN216411647U requires two connectors to be pre-installed in a limit seat respectively, and then the two limit seats are docked, and then the docked limit seats are mutually limited by a U-shaped card. In this way, the number of structural parts of the connector is large, the matching accuracy cannot reach a high level, and the accuracy after installation cannot be guaranteed;

[0005] Some fixing methods are inconvenient for actual use, disassembly, maintenance, and easy to damage the connector. For example, an MT-MT optical fiber connector with publication number CN215867231U requires the two plugs to be pre-plugged during installation, and then a cover plate is installed on the plug-in channel. In this way, the two plugs lack limit during the disassembly and assembly of the cover plate, and the amount of movement between the plugs will lead to reduced accuracy and increased optical loss. At the same time, it is also inconvenient for disassembly and assembly. Summary of the invention

[0006] According to a first aspect of the present invention, an adapter for MT-MT optical fiber jumper connection is provided, comprising:

[0007] An optical fiber jumper assembly, the optical fiber jumper assembly comprising two groups of optical fiber jumpers and first MT optical contacts and second MT optical contacts respectively arranged at the ends of the two groups of optical fiber jumpers and capable of being plugged into each other to realize optical coupling, the first MT optical contacts and the second MT optical contacts being arranged in the form of a cuboid with a rectangular cross section, the tail ends of the first MT optical contacts and the second MT optical contacts both having a convex step seat protruding outward in a circumferential direction, and a step is formed at the convex step seat;

[0008] The adapter base is fixed on the PCB board by a first screw, and the top surface is provided with a through slot with an upper side open and capable of accommodating the second MT optical contact piece;

[0009] An adapter cover plate is arranged to cover the top of the adapter base, so that the through groove forms a first positioning through groove with a closed periphery, and can limit and fix the second MT optical contact member in the first positioning through groove;

[0010] The adapter front cover is detachably mounted on the front end of the adapter base along the socket direction by a second screw, has a second positioning through groove for accommodating the first MT optical contact, and can elastically press the first MT optical contact along the socket direction to tightly plug the first MT optical contact and the second MT optical contact;

[0011] The butt joint end of the adapter base, the adapter cover plate and the adapter front cover is defined as the head end, and the other end is defined as the tail end. The first positioning through groove includes a socket channel, a second joint limiting cavity and a second optical fiber channel which are sequentially distributed from the head end to the tail end along the socket direction and are interconnected. The optical fiber jumper passes through the second optical fiber channel of the tail end. The convex step seat on the outer wall of the second MT optical contact is clamped in the second joint limiting cavity to limit the movement of the second MT optical contact in the socket direction, so that the second MT optical contact is limited and fixed between the adapter cover plate and the adapter base. After being socketed, the second MT optical contact and the first MT optical contact are both located in the socket channel, and the peripheral outer walls are both in contact with the inner wall of the socket channel, so that the first MT optical contact and the second MT optical contact can only slide along the socket direction in the socket channel, and the convex step seat of the first MT optical contact is located outside the socket channel.

[0012] Preferably, the limiting surfaces around the socket channel respectively include a first guide surface located on the adapter base, second guide surfaces symmetrically distributed on both sides of the first guide surface, and a third guide surface arranged on the bottom surface of the adapter cover; after the adapter cover is covered on the top surface of the adapter base, the first guide surface, the second guide surface and the third guide surface form the socket channel which is through at both ends and closed on all sides; the socket channel is processed into a channel which fits with the outer walls of the peripheral sides of the first MT optical contact and the second MT optical contact.

[0013] Preferably, the top surface of the adapter base has two symmetrically distributed first fitting surfaces, the third guide surface protrudes from the bottom surface of the adapter cover, and both sides of the third guide surface have second fitting surfaces opposite to the first fitting surfaces, and a boss surface is formed between the third guide surface and the second fitting surface, and when the adapter cover is covered with the adapter base, the second fitting surface is in contact with the first fitting surface, the third guide surface is located above the first guide surface, and the boss surface is in contact with the second guide surface.

[0014] Preferably, a groove is provided on the adapter base corresponding to the tail end of the socket channel, the depth and width of the groove are both greater than the socket channel, and the width of the groove is equal to the width of the convex step seat, so that a first step surface is formed at the connection between the groove and the socket channel, the length of the groove is equal to the length of the convex step seat, and the bottom surface of the adapter cover plate is provided with a first limiting surface connected to the third guide surface, the first limiting surface is lower than the third guide surface and forms a second step surface;

[0015] After the adapter cover is covered on the top surface of the adapter base, the first limiting surface is located above the groove, and the height between the first limiting surface and the groove is equal to the height of the convex step seat, and the step formed between the second MT optical contact and the convex step seat is in contact with the first step surface and the second step surface, and is used to limit the front of the convex step seat, so that the second joint limiting cavity for accommodating and limiting the circumferential side of the convex step seat is formed between the groove and the first limiting surface, and the length of the second joint limiting cavity is equal to the length of the convex step seat.

[0016] Preferably, a window is provided on the adapter base at the tail end corresponding to the second joint limiting cavity, the window is higher than the groove and smaller in width than the groove, forming a third step surface for limiting the rear part of the convex step seat, a second limiting surface is provided at the tail end of the first limiting surface, and both sides of the second limiting surface have recesses, so that the width of the second limiting surface is equal to the width of the window;

[0017] After the adapter cover is covered on the top surface of the adapter base, the second limiting surface is located above the window to form the second optical fiber channel for the optical fiber jumper to pass through.

[0018] Preferably, two first positioning screw holes are symmetrically distributed on both sides of the adapter base corresponding to the socket channel, and a first through hole is opened on the adapter cover plate corresponding to the first positioning screw holes. A first screw is installed in the first through hole and the first positioning screw hole for screwing the adapter base and the adapter cover plate together.

[0019] Preferably, the length of the adapter cover is smaller than the length of the adapter base, and after the adapter cover is covered on the top surface of the adapter base, the rear end of the adapter base is flush with the rear end of the adapter cover, so that the front ends of the adapter base and the adapter cover form a step groove, and the step groove is located at the head end of the socket channel, and is used to limit the position of the socket direction of the first MT optical contact and the installation position of the adapter front cover.

[0020] Preferably, the head end of the adapter front cover is provided with a step platform that cooperates with the step groove, and the step platform includes a second step surface that fits with the head end of the adapter cover plate, a first step surface that fits with the upper end surface of the adapter base, and a third fitting surface that fits with the head end of the adapter base.

[0021] Preferably, the second positioning through groove includes a first connector limiting cavity, a spring accommodating cavity and a first optical fiber channel which are distributed in sequence from the head end to the tail end along the socket direction and are interconnected, the convex step seat on the outer wall of the first MT optical contact is located in the first connector limiting cavity, and a spring is installed in the spring accommodating cavity for elastically pressing the first MT optical contact toward the second MT optical contact, and the optical fiber jumper passes through the first optical fiber channel at the tail end.

[0022] Preferably, the mating surfaces of the adapter base and the adapter front cover are provided with symmetrically distributed second positioning screw holes on both sides corresponding to the socket channel, and the adapter front cover is provided with spring accommodating cavities parallel to the socket direction corresponding to the second positioning screw holes, and second screws are installed in the spring accommodating cavity and the second positioning screw holes to mate and fix the adapter front cover, the adapter base and the adapter cover plate.

[0023] Preferably, the cross-section of the first optical fiber channel is the same as the cross-section of the second optical fiber channel, the cross-section of the first connector limiting cavity is the same as the cross-section of the second connector limiting cavity, and the length of the first connector limiting cavity is greater than the length of the convex step seat, so that after the first MT optical contact and the second MT optical contact are socketed, there is a certain gap between the convex step seat and the head end of the adapter base.

[0024] Preferably, a notch is provided on the peripheral outer wall of the adapter front cover, the notch passes through the first connector limiting cavity, the spring accommodating cavity and the first optical fiber channel, and enables the optical fiber jumper to enter the first optical fiber channel through the notch from the outside of the adapter front cover.

[0025] Preferably, a step surface is provided on the inner wall of the second positioning groove corresponding to the spring accommodating cavity, and the step surface is distributed in the width direction of the spring accommodating cavity, and is used to abut the rear end of the convex step seat, so that when the adapter front cover is matched with the adapter base and the adapter cover plate, the second MT optical contact and the first MT optical contact are plugged into place.

[0026] Preferably, more than four symmetrically distributed first positioning screw holes are opened on the side of the adapter base away from the adapter cover plate, and first screws are screwed and installed in the first positioning screw holes, and the adapter cover plate and the PCB board are screwed and fixed by the first screws.

[0027] According to a second aspect of the present invention, a method for connecting an MT-MT optical fiber jumper is provided, comprising the following steps:

[0028] Step 1: Install the fixed part of the adapter:

[0029] 1.1) Install the adapter base: fix the adapter base to the PCB board;

[0030] 1.2) Install the second MT optical contact: Install the second MT optical contact with the guide pin into the socket channel, and make the convex step seat part clamped in the second connector limit cavity to reach the limit state in the socket direction, and the optical fiber jumper part passes through the second optical fiber channel at the rear;

[0031] 1.3) Install the transfer cover: Install the transfer cover on the top of the transfer base and fix it so that the second MT optical contact is completely restricted and fixed between the transfer base and the transfer cover without any movement margin;

[0032] Step 2, socket joint: a spring is installed on the outer side of the optical fiber jumper connected to the first MT optical contact, and the second MT optical contact with the socket is moved along the socket channel toward the second MT optical contact, until the second MT optical contact contacts the end surface of the first MT optical contact;

[0033] Step 3, install the adapter front cover: insert the optical fiber jumper into the first optical fiber channel through the gap, and screw the adapter front cover to the adapter base through the second screw, and the spring located in the adapter front cover elastically presses the first MT optical contact, so that the first MT optical contact and the second MT optical contact always have elastic pressure between them in the direction of mutual insertion.

[0034] According to a third aspect of the present invention, an adapter for MT-MT optical fiber jumper connection is provided, comprising:

[0035] An optical fiber jumper assembly, the optical fiber jumper assembly comprising two groups of optical fiber jumpers, and a first MT optical contact and a second MT optical contact respectively arranged at the ends of the two groups of optical fiber jumpers and capable of being plugged into each other to realize optical coupling, the first MT optical contact and the second MT optical contact being arranged in a rectangular parallelepiped with a rectangular cross section, the tail ends of the first MT optical contact and the second MT optical contact both having a convex step seat protruding outward in a circumferential direction, and a step is formed at the convex step seat;

[0036] The adapter base is arranged and fixed on the PCB board, and a through groove for limiting the second MT optical contact piece and the convex step seat is opened on the top surface;

[0037] The adapter cover is arranged to cover the top of the adapter base, and clamps and fixes the second MT optical contact in the through groove, and forms a first positioning through groove for the first MT optical contact to be plugged in at the front end of the receiving groove;

[0038] The adapter front cover is detachably mounted on the front end of the adapter base along the socket direction by a second screw, and can elastically press the first MT optical contact piece along the plug-in direction;

[0039] Wherein, the length of the first MT optical contact inserted into the first positioning through groove is less than the total length of the first MT optical contact.

[0040] Preferably, when the first MT optical contact and the second MT optical contact are inserted into each other and into a mutually fitting position, the convex step seat is located outside the insertion channel.

[0041] Preferably, the outer wall of the first MT optical contact is in contact with the inner wall of the first positioning groove.

[0042] Preferably, a spring is installed in the adapter front cover and has a second positioning groove for accommodating the convex step seat, so that after the adapter front cover is installed and fixed, the convex step seat is located in the second positioning groove, and the spring can elastically press the first MT optical contact along the plugging direction.

[0043] Compared with the prior art, the MT-MT optical fiber jumper adapter of the present invention and the MT-MT optical fiber jumper connection method based thereon have the following significant beneficial effects:

[0044] 1. The present invention uses three CNC-processed aluminum alloy structural parts to complete the assembly, making the overall structure simple and compact, and convenient for disassembly, ensuring good product consistency, satisfying interchangeability, and having good maintainability. All structural parts are surface anodized or nickel-plated, and have good environmental adaptability.

[0045] 2. The present invention utilizes the adapter base and the adapter cover to form the fixed part of the adapter, which is used to fix one of the MT optical contacts and form a guide channel for insertion, so that the other MT optical contact can be inserted with the fixed MT optical contact with high precision to reduce light loss.

[0046] 3. After the connectors are butt-jointed, the present invention can fix the connector part by installing the adapter front cover, which can effectively fix the MT optical contact and ensure the connection performance of the MT-MT optical fiber jumper. At the same time, it is convenient to disassemble and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0048] Figure 1 It is a schematic diagram of the three-dimensional structure of the optical fiber jumper assembly in the adapter for MT-MT optical fiber jumper connection shown in an embodiment of the present invention;

[0049] Figure 2 It is an isometric schematic diagram of an adapter for MT-MT optical fiber jumper connection shown in an embodiment of the present invention in an installed state from an upper side perspective;

[0050] Figure 3 It is an isometric schematic diagram of an adapter for MT-MT optical fiber jumper connection shown in an embodiment of the present invention in an installed state from a side perspective;

[0051] Figure 4 It is a schematic diagram of a vertical cross-sectional structure of the central axis of an adapter for connecting MT-MT optical fiber jumpers shown in an embodiment of the present invention;

[0052] Figure 5 yes Figure 4 A schematic diagram of a cross-sectional structure after removing the optical fiber jumper assembly;

[0053] Figure 6 It is a schematic diagram of a horizontal cross-sectional structure of the central axis of an adapter for connecting MT-MT optical fiber jumpers shown in an embodiment of the present invention;

[0054] Figure 7 yes Figure 6 A schematic diagram of a cross-sectional structure after removing the optical fiber jumper assembly;

[0055] Figure 8 It is a schematic diagram of the three-dimensional structure of the adapter base in the adapter for connecting MT-MT optical fiber jumpers shown in an embodiment of the present invention;

[0056] Fig. 9 yes Figure 8 A schematic diagram of the three-dimensional structure of the optical fiber jumper assembly installed in the transfer base;

[0057] Fig.10 yes Fig. 9 A schematic diagram of a three-dimensional structure in which a transfer cover is installed above the transfer base;

[0058] Fig.11 It is a schematic diagram of the three-dimensional structure of the bottom perspective of the adapter cover plate in the adapter for MT-MT optical fiber jumper connection shown in an embodiment of the present invention;

[0059] Fig.12 It is a schematic diagram of the three-dimensional structure from the top perspective of the adapter cover plate in the adapter for MT-MT optical fiber jumper connection shown in an embodiment of the present invention;

[0060] Fig.13 It is a schematic diagram of the three-dimensional structure of the adapter front cover in the adapter for MT-MT optical fiber jumper connection shown in an embodiment of the present invention;

[0061] Fig.14 yes Fig.13 Schematic diagram of the structure of installing the second MT optical contact in the front cover of the intermediate adapter. DETAILED DESCRIPTION

[0062] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0063] Since the existing MT-MT fiber optic patch cord adapter has many structural parts and low matching accuracy, which leads to the problem of increased optical loss when the fiber optic patch cord is connected, the present invention proposes an adapter for MT-MT fiber optic patch cord connection with simple structure and high matching accuracy, aiming to improve the connection accuracy of MT-MT fiber optic patch cords, reduce optical loss, and has a simple structure and is easy to disassemble and assemble.

[0064]

Adapter for MT-MT fiber optic patch cord connection

[0065] A first aspect of the present invention provides a technical solution, an adapter for MT-MT fiber optic patch cord connection includes a fiber optic patch cord assembly 10, an adapter base 30, an adapter cover plate 40 and an adapter front cover 50.

[0066] like Figure 2 and Figure 3 As shown, the new adapter shown in the present invention is installed on a PCB board 01 and fixed by four first screws 02 at the bottom. The PCB board 01 is a circuit board applied to optical fiber data transmission. In order to ensure the high precision of the plug connector connection, a group of MT-MT optical fiber jumpers can be connected. The width of the new adapter is 20 mm. According to the use requirements, multiple ones can be installed in the width direction of the PCB board 01 to connect multiple groups of MT-MT optical fiber jumpers, so that the plug connectors are guaranteed not to affect each other.

[0067] Fiber Optic Patch Cable Assemblies

[0068] like Figure 1 As shown, the fiber jumper assembly 10 includes two groups of fiber jumpers 11 and a first MT optical contact 12 (with guide pins) and a second MT optical contact 13 (with sockets) respectively arranged at the ends of the two groups of fiber jumpers 11 and can be plugged into each other to achieve optical coupling.

[0069] Among them, the first MT optical contact 12 and the second MT optical contact 13 both adopt the existing standard MT connector and are configured as a cuboid with a rectangular cross-section. The tail ends of the first MT optical contact 12 and the second MT optical contact 13 both have a convex step seat 14 protruding outward in the circumferential direction, and a step is formed at the convex step seat 14, which can play a limiting role in the socket direction.

[0070] Adapter Base

[0071] like Figure 8-Figure 9 As shown, the adapter base 30 is fixed on the PCB board 01 by the first screw 02, and the top surface is provided with a through groove with an open upper side capable of accommodating the second MT optical contact 13, wherein the through groove includes a channel portion, a groove and a window.

[0072] Among them, the channel part is composed of a first guide surface 31 located on the adapter base 30 and a second guide surface 32 symmetrically distributed on both sides of the first guide surface 31. The upper part is an open end. A groove is set at the tail end of the adapter base 30 corresponding to the channel part. The depth and width of the groove are greater than the channel part, so that a first step surface is formed at the connection between the groove and the channel part, and the length of the groove is equal to the length of the convex step seat 14. A window is set at the tail end of the corresponding groove on the adapter base 30. The window is higher than the groove and has a width smaller than the groove, forming a third step surface for limiting the rear part of the convex step seat 14.

[0073] In this way, the second MT optical contact 13 is installed in the through groove and is limited in both the socket direction and the horizontal direction, and can only move vertically up and down along the direction in which it is inserted during installation.

[0074] like Fig. 9 As shown, in some embodiments, the length of the groove can be processed longer, and accordingly, a limiter 60 is installed inside the groove. The limiter 60 is generally a rectangular block made of aluminum alloy and is used to limit the movement of the second MT optical contact 13 in the through groove along the socket direction.

[0075] Furthermore, the top surface of the adapter base 30 has two symmetrically distributed first fitting surfaces 33, and two symmetrically distributed first positioning screw holes 304 are opened on both sides of the corresponding through grooves on the first fitting surfaces 33, wherein the first fitting surfaces 33 are set to be a smooth plane, and the first positioning screw holes 304 are standard screw holes.

[0076] The entire adapter base 30 is made of aluminum alloy and is integrally formed by CNC precision machining. The overall structure is simple and the precision is high.

[0077] Adapter cover

[0078] like Fig.11 and Fig.12As shown, the third guide surface 41 of the bottom surface of the adapter cover plate 40 protrudes from the bottom surface of the adapter cover plate 40 , and both sides of the third guide surface 41 have second fitting surfaces 43 opposite to the first fitting surface 33 .

[0079] Furthermore, the bottom surface of the adapter cover 40 is provided with a first limiting surface 42 connected to the third guide surface 41. The first limiting surface 42 is lower than the third guide surface 41 and forms a second step surface. The first limiting surface 42 is located directly above the groove and is used to limit the upper part of the convex step seat 14, so that after the adapter cover 40 is installed, the second MT optical contact 13 cannot move upward and is firmly restricted without any room for movement.

[0080] Specifically, a second limiting surface 44 is set at the tail end of the first limiting surface 42, and two sides of the second limiting surface 44 have yielding grooves 402, so that the width of the second limiting surface 44 is equal to the width of the window, so that after the adapter cover 40 is covered on the top surface of the adapter base 30, the second limiting surface 44 is located above the window, forming a second optical fiber channel 303 for the optical fiber jumper 11 to pass through.

[0081] The entire adapter cover 40 is made of aluminum alloy and is formed in one piece by CNC precision machining. The overall structure is simple and the precision is high.

[0082] Coordination and installation of the adapter base and adapter cover

[0083] like Fig.10 As shown, the fixing part of the adapter is formed by the high-precision cooperation between the adapter base 30 and the adapter cover 40 .

[0084] Specifically, when the adapter cover 40 is disposed and covered on the top of the adapter base 30 , the through groove forms a first positioning through groove with a closed circumference, and the second MT optical contact 13 in the first positioning through groove can be limited and fixed.

[0085] Among them, Figure 8 As shown, the first positioning through groove includes a socket channel 301, a second joint limiting cavity 302 and a second optical fiber channel 303 which are distributed in sequence from the head end to the tail end along the socket direction and are interconnected.

[0086] Specifically, Figure 5 , Figure 7 , Figure 8 and Fig.11As shown, the limiting surfaces around the socket channel 301 include a first guide surface 31 located on the adapter base 30, second guide surfaces 32 symmetrically distributed on both sides of the first guide surface 31, and a third guide surface 41 arranged on the bottom surface of the adapter cover 40. After the adapter cover 40 is covered on the top surface of the adapter base 30, the first guide surface 31, the second guide surface 32 and the third guide surface 41 form a socket channel 301 that is through at both ends and closed on all sides. The socket channel 301 is processed into a channel that fits with the outer walls of the first MT optical contact 12 and the second MT optical contact 13.

[0087] So, like Figure 4 , Figure 6 and Fig. 9 As shown, the second MT optical contact 13 and the first MT optical contact 12 are both located in the socket channel 301 after being socketed, and the peripheral outer walls are both in contact with the inner wall of the socket channel 301, so that the first MT optical contact 12 and the second MT optical contact 13 can only slide along the socket direction in the socket channel 301.

[0088] Specifically, the second joint limiting cavity 302 is formed as follows: Figure 5 , Figure 7 , Figure 8 and Fig.11 As shown, a groove is provided on the adapter base 30 corresponding to the tail end of the socket channel 301, the depth and width of the groove are greater than the socket channel 301, and the width of the groove is equal to the width of the convex step seat 14, so that a first step surface is formed at the connection between the groove and the socket channel 301, and the length of the groove is equal to the length of the convex step seat 14, and a first limiting surface 42 connected to the third guide surface 41 is provided on the bottom surface of the adapter cover plate 40, and the first limiting surface 42 is lower than the third guide surface 41 and forms a second step surface;

[0089] After the adapter cover 40 is covered on the top surface of the adapter base 30, the first limiting surface 42 is located above the groove, and the height between the first limiting surface 42 and the groove is equal to the height of the convex step seat 14, and the step formed between the second MT optical contact 13 and the convex step seat 14 is in contact with the first step surface and the second step surface, which is used to limit the front of the convex step seat 14, so that a second joint limiting cavity 302 for accommodating and limiting the circumferential side of the convex step seat 14 is formed between the groove and the first limiting surface 42, and the length of the second joint limiting cavity 302 is equal to the length of the convex step seat 14, which can limit the socket direction of the convex step seat 14.

[0090] So, like Figure 4 , Figure 6 and Fig. 9As shown, the convex step seat 14 on the outer wall of the second MT optical contact 13 is clamped in the second joint limiting cavity 302 to limit the movement of the second MT optical contact 13 in the socket direction, so that the second MT optical contact 13 is limited and fixed between the adapter cover 40 and the adapter base 30.

[0091] Specifically, the second optical fiber channel 303 is formed as follows: Figure 5 , Figure 7 , Figure 8 and Fig.11 As shown, a window is provided at the tail end of the second connector limiting cavity 302 on the adapter base 30, and the window is higher than the groove and has a width smaller than the groove, forming a third step surface for limiting the rear part of the convex step seat 14. A second limiting surface 44 is provided at the tail end of the first limiting surface 42 on the adapter cover 40, and both sides of the second limiting surface 44 have yielding grooves 402, so that the width of the second limiting surface 44 is equal to the width of the window, so that the adapter cover 40 and the adapter base 30 are covered together to form a second optical fiber channel 303 for the optical fiber jumper 11 to pass through.

[0092] Further, such as Figure 9-11 As shown, the mating surfaces of the adapter base 30 and the adapter cover plate 40, wherein the top surface of the adapter base 30 has two symmetrically distributed first fitting surfaces 33, the third guide surface 41 protrudes from the bottom surface of the adapter cover plate 40, and the two sides of the third guide surface 41 have second fitting surfaces 43 opposite to the first fitting surface 33, and a boss surface is formed between the third guide surface 41 and the second fitting surface 43. When the adapter cover plate 40 and the adapter base 30 are covered, the second fitting surface 43 is fitted with the first fitting surface 33, the third guide surface 41 is located above the first guide surface 31, and the boss surface is fitted with the second guide surface 32.

[0093] Correspondingly, two symmetrically distributed first positioning screw holes 304 are opened on both sides of the adapter base 30 corresponding to the socket channel 301, and a first through hole 401 is opened on the adapter cover plate 40 corresponding to the first positioning screw hole 304. The first screw 02 is installed in the first through hole 401 and the first positioning screw hole 304, so as to screw and fix the adapter base 30 and the adapter cover plate 40.

[0094] In this way, a precisely covered adapter fixing part is formed, which can accurately limit the position of the internal second MT optical contact 13, ensuring that the second MT optical contact 13 has no movement margin, thereby ensuring that there is no light loss caused by movement during insertion.

[0095] The adapter fixing part can limit the second MT optical contact 13 with only two structural parts, and is small in size, easy to install and does not take up space. Fewer matching structures can greatly improve the accuracy of the processing and installation processes.

[0096] Adapter front cover

[0097] like Figure 4-Figure 7 As shown, the adapter front cover 50 is arranged to be detachably installed on the front end of the adapter base 30 along the socket direction by the second screw 03, and has a second positioning groove for accommodating the first MT optical contact 12 inside, and can elastically press the first MT optical contact 12 along the socket direction to make the first MT optical contact 12 and the second MT optical contact 13 tightly plugged.

[0098] like Fig.13 and Fig.14 As shown, the second positioning groove includes a first connector limiting cavity 501, a spring accommodating cavity 502 and a first optical fiber channel 503 which are sequentially distributed from the head end to the tail end along the socket direction and are interconnected. The convex step seat 14 on the outer wall of the first MT optical contact 12 is located in the first connector limiting cavity 501, and a spring 20 is installed in the spring accommodating cavity 502 for elastically pressing the first MT optical contact 12 toward the second MT optical contact 13. The optical fiber jumper 11 passes through the first optical fiber channel 503 at the tail end.

[0099] Specifically, a notch 505 is provided on the peripheral outer wall of the adapter front cover 50, and the notch 505 passes through the first connector limiting cavity 501, the spring accommodating cavity 502 and the first optical fiber channel 503, and enables the optical fiber jumper 11 to enter the first optical fiber channel 503 through the notch 505 from the outside of the adapter front cover 50.

[0100] Furthermore, a step surface 54 is provided on the inner wall of the second positioning groove corresponding to the spring accommodating cavity 502. The step surface 54 is distributed in the width direction of the spring accommodating cavity 502 and is used to abut the rear end of the convex step seat 14, so that when the adapter front cover 50 is matched with the adapter base 30 and the adapter cover plate 40, the step surface 54 can abut against the convex step seat 14 of the first MT optical contact 12, so that the second MT optical contact 13 and the first MT optical contact 12 are plugged into place.

[0101] Specifically, the cross-section of the first optical fiber channel 503 is the same as that of the second optical fiber channel 303, and the cross-section of the first joint limiting cavity 501 is the same as that of the second joint limiting cavity 302, both of which are used to accommodate the convex step seat 14, and the length of the first joint limiting cavity 501 is greater than the length of the convex step seat 14, so that after the first MT optical contact 12 and the second MT optical contact 13 are plugged together, there is a certain gap between the convex step seat 14 and the head end of the adapter base 30, and the elastic deformation space of the spring 20 is reserved. When the adapter front cover 50 is loose due to frequent vibrations, the first MT optical contact 12 can still be tightly attached to the second MT optical contact 13 under the action of the spring 20.

[0102] The adapter front cover 50 is made of aluminum alloy and is integrally formed by CNC precision machining. The overall structure is simple and the precision is high.

[0103] Installation of the adapter front cover

[0104] like Fig.10 As shown, the length of the adapter cover 40 is smaller than the length of the adapter base 30, and after the adapter cover 40 is covered on the top surface of the adapter base 30, the rear end of the adapter base 30 is flush with the rear end of the adapter cover 40, so that the front ends of the adapter base 30 and the adapter cover 40 form a step groove, and the head end of the adapter front cover 50 is provided with a step platform that cooperates with the step groove, and the step platform includes a second step surface 52 that is bonded to the head end of the adapter cover 40, a first step surface 51 that is bonded to the upper end surface of the adapter base 30, and a third bonding surface 53 that is bonded to the head end of the adapter base 30.

[0105] Furthermore, symmetrically distributed second positioning screw holes 305 are provided on both sides of the socket channel 301 corresponding to the mating surfaces of the adapter base 30 and the adapter front cover 50, and spring accommodating cavities 502 parallel to the socket direction are provided on the adapter front cover 50 corresponding to the second positioning screw holes 305, and second screws 03 are installed in the spring accommodating cavity 502 and the second positioning screw holes 305, so as to mate and fix the adapter front cover 50, the adapter base 30 and the adapter cover plate 40.

[0106] Correspondingly, more than four symmetrically distributed first positioning screw holes 304 are opened on the side of the adapter base 30 away from the adapter cover 40, and the first screws 02 are screwed and installed in the first positioning screw holes 304, and the adapter cover 40 and the PCB board 01 are screwed and fixed by the first screws 02.

[0107] In this way, during installation, the spring 20 is first installed to the outside of the optical fiber jumper 11 with the first MT optical contact 12, and then the first MT optical contact 12 is moved toward the first MT optical contact 12 along the socket channel 301 and socketed into place, and then the optical fiber jumper 11 enters the first optical fiber channel 503 through the notch 505, so that the adapter front cover 50 is approached to the adapter base 30 and the adapter cover plate 40 along the socket direction until the end face of the adapter front cover 50 is in contact with the end faces of the adapter base 30 and the adapter cover plate 40, and then the second screw 03 installed in the second through hole 504 is tightened to screw the adapter front cover 50 to the adapter base 30.

[0108] The entire installation process will not affect the position of the first MT optical contact 12, and after installation, elastic pressure is applied to the first MT optical contact 12 in the socket direction, which can prevent the first MT optical contact 12 from loosening and achieve a stable socket state. Correspondingly, during the disassembly process, the stability of the connection between the first MT optical contact 12 and the second MT optical contact 13 will not be affected.

[0109] [Connection method of the adapter used for MT-MT fiber optic patch cord connection]

[0110] The second aspect of the present invention proposes a technical solution, a method for connecting an adapter for MT-MT optical fiber jumper connection, using the above-mentioned adapter for MT-MT optical fiber jumper connection, comprising the following steps:

[0111] Step 1: Install the fixed part of the adapter:

[0112] 1.1. Install the adapter base 30: fit the bottom surface of the adapter base 30 with the surface of the PCB board 01, and install the first screws 02 into the four first positioning screw holes 304 at the bottom of the adapter base 30 to fix the adapter base 30 to the PCB board 01. The first screws 02 are standard cross screws or hexagon socket screws (the figure shows a cross screw), which can stably fix the adapter base 30 on the PCB board 01. The number of adapter bases 30 can also be adaptively increased according to needs.

[0113] In this way, the independently arranged adapter fixes a group of jumper connectors separately, and when the connectors are installed and removed, the surrounding jumper connectors will not be affected.

[0114] 1.2) Install the second MT optical contact 13: Install the second MT optical contact 13 with the guide pin into the socket channel 301, and make the convex step seat 14 partially clamped in the second joint limiting cavity 302 to reach the limiting state in the socket direction, and the optical fiber jumper 11 partially passes through the second optical fiber channel 303 at the rear.

[0115] 1.3) Install the adapter cover 40: Install the adapter cover 40 on the top of the adapter base 30, and make the third guide surface 41 at the bottom of the adapter cover 40 fit with the upper part of the second MT optical contact 13, and the bottom surface of the first limiting surface 42 fits with the upper part of the convex step seat 14, and then install the first screw 02 to screw the adapter cover 40 and the adapter base 30 to fix them, so that the second MT optical contact 13 is completely restricted and fixed between the adapter base 30 and the adapter cover 40, and there is no room for movement.

[0116] In this way, the installation of the fixed part of the adapter is completed, and the position of the internal second MT optical contact 13 can be accurately limited to ensure that the second MT optical contact 13 has no movable margin, thereby ensuring that there is no light loss due to movement during insertion, and fewer matching structures can greatly improve the accuracy of the processing and installation processes.

[0117] Step 2, socket joint: install the spring 20 on the outer side of the optical fiber jumper 11 connected to the first MT optical contact 12, and move the first MT optical contact 12 with the socket along the socket channel 301 toward the second MT optical contact 13 until it is socketed into place with the second MT optical contact 13.

[0118] In this process, since the socket channel 301 is processed with high precision, the socket process precision of the first MT optical contact 12 and the second MT optical contact 13 is higher, so the matching precision is also high and the optical loss is small.

[0119] Step 3, installing the adapter front cover 50: insert the optical fiber jumper 11 into the first optical fiber channel 503 through the notch 505, and then move the adapter front cover 50 toward the adapter base 30 and the adapter cover plate 40 along the socket direction until the end surface of the adapter front cover 50 fits with the end surface of the adapter base 30 and the adapter cover plate 40, and then tighten the second screw 03 installed in the second through hole 504 to screw the adapter front cover 50 to the adapter base 30. At this time, the spring 20 is located inside the spring accommodating cavity 502 and elastically presses the first MT optical contact 12, so that the second MT optical contact 13 and the first MT optical contact 12 always have elastic pressure between them in the socket direction.

[0120] Example 1

[0121] Test Data

[0122] The optical fiber model used in this embodiment is: 12-core single-mode optical fiber patch cord MT12-12FC / UPC-B1-L1.

[0123] The test equipment used in this embodiment is: Insertion-Return Loss Tester JW3327C.

[0124] During the test, the connector part of the optical jumper is connected using the above connection method, and then the two jumpers are respectively plugged into the input port and output port of the insertion return loss tester to obtain test data. The test is performed three times.

[0125] Among them, the standard stipulates that the typical value of single-mode optical fiber insertion loss is 0.35dB, the maximum value is 1.0dB, and the return loss is ≥30dB.

[0126] The general measured values ​​are: insertion loss is between 0.26dB-0.32dB, and return loss is between 32dB-35dB.

[0127] The three sets of data of the measured values ​​of this application are: insertion loss 0.2dB, 0.22dB, 0.23dB, return loss 38dB, 38dB, 39dB.

[0128] It can be concluded from the test data that the adapter of the present application reduces the difficulty of the jumper installation process with its simple design structure and high processing accuracy, and has high installation accuracy, so that the test value of optical fiber transmission is not only better than the standard, but also better than the test value of conventional adapter structure.

[0129] In combination with the above embodiments, the adapter proposed by the present invention includes an optical fiber jumper assembly 10 and three structural parts: an adapter base 30, an adapter cover 40, and an adapter front cover 50. The adapter base 30 and the adapter cover 40 can constitute a fixed part of the adapter, which is used to fix one of the second MT optical contacts 13, so that the first MT optical contact 12 can be freely plugged with the second MT optical contact 13, and the adapter front cover 50 is installed along the plugging direction after the plugging. The whole device is formed by high-precision CNC processing, has a simple structure and a small size, and can effectively fix the MT optical contact, ensure the connection performance of the MT-MT optical fiber jumper, and is convenient for disassembly and maintenance.

[0130] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An adapter for MT-MT optical fiber jumper connection, characterized in that: include: An optical fiber jumper assembly (10), the optical fiber jumper assembly (10) comprising two groups of optical fiber jumpers (11) and a first MT optical contact (12) and a second MT optical contact (13) respectively arranged at the ends of the two groups of optical fiber jumpers (11) and capable of being plugged into each other to achieve optical coupling, the first MT optical contact (12) and the second MT optical contact (13) being arranged in the form of a cuboid with a rectangular cross-section, the tail ends of the first MT optical contact (12) and the second MT optical contact (13) both having a convex step seat (14) protruding outward in a circumferential direction, and a step is formed at the convex step seat (14); An adapter base (30) is fixed on the PCB board (01) by means of a first screw (02), and a through slot with an open upper side capable of accommodating the second MT optical contact member (13) is provided on the top surface; An adapter cover plate (40) is arranged to cover the top of the adapter base (30), so that the through groove forms a first positioning through groove with a closed circumference, and can limit and fix the second MT optical contact member (13) in the first positioning through groove; The adapter front cover (50) is detachably mounted on the front end of the adapter base (30) along the socket-insertion direction by means of a second screw (03), has a second positioning through slot for accommodating the first MT optical contact (12) inside, and can elastically press the first MT optical contact (12) along the socket-insertion direction so that the first MT optical contact (12) and the second MT optical contact (13) are tightly plugged together; The butt joint end of the adapter base (30), the adapter cover plate (40) and the adapter front cover (50) is defined as the head end, and the other end is defined as the tail end. The first positioning through groove comprises a socket channel (301), a second connector limiting cavity (302) and a second optical fiber channel (303) which are sequentially distributed from the head end to the tail end along the socket direction and are interconnected. The optical fiber jumper (11) passes through the second optical fiber channel (303) at the tail end. The convex step seat (14) on the outer wall of the second MT optical contact (13) is clamped in the second connector limiting cavity (302) to limit the second MT optical contact (13) in the socket direction. The second MT optical contact (13) is fixed between the adapter cover (40) and the adapter base (30) so that the second MT optical contact (13) and the first MT optical contact (12) are both located in the socket channel (301) after being socketed, and the peripheral outer walls are both in contact with the inner wall of the socket channel (301), so that the first MT optical contact (12) and the second MT optical contact (13) can only slide along the socket direction in the socket channel (301), and the convex step seat (14) of the first MT optical contact (12) is located outside the socket channel (301); The second positioning through groove comprises a first joint limiting cavity (501) and a spring accommodating cavity (502) which are sequentially distributed from the head end to the tail end along the socket-insertion direction and are interconnected. The convex step seat (14) on the outer wall of the first MT optical contact (12) is located in the first joint limiting cavity (501), and a spring (20) is installed in the spring accommodating cavity (502) for elastically pressing the first MT optical contact (12) in the direction of the second MT optical contact (13). The cross section of the first joint limiting cavity (501) is the same as that of the second joint limiting cavity (302), and the length of the first joint limiting cavity (501) is greater than that of the convex step seat (14), so that after the first MT optical contact (12) and the second MT optical contact (13) are socket-inserted, there is a gap between the convex step seat (14) and the head end of the adapter base (30).

2. The adapter for MT-MT optical fiber jumper connection according to claim 1, characterized in that: The limiting surfaces around the socket channel (301) respectively include a first guide surface (31) located on the adapter base (30), second guide surfaces (32) symmetrically distributed on both sides of the first guide surface (31), and a third guide surface (41) arranged on the bottom surface of the adapter cover plate (40); after the adapter cover plate (40) covers the top surface of the adapter base (30), the first guide surface (31), the second guide surface (32) and the third guide surface (41) enclose the socket channel (301) which is through-connected at both ends and closed on all sides; the socket channel (301) is processed into a channel that fits with the outer walls of the first MT optical contact piece (12) and the second MT optical contact piece (13).

3. The adapter for MT-MT optical fiber jumper connection according to claim 2, characterized in that: The top surface of the adapter base (30) has two symmetrically distributed first fitting surfaces (33); the third guide surface (41) protrudes from the bottom surface of the adapter cover plate (40); the third guide surface (41) has second fitting surfaces (43) on both sides thereof that are opposite to the first fitting surfaces (33); a convex table surface is formed between the third guide surface (41) and the second fitting surface (43); when the adapter cover plate (40) and the adapter base (30) are covered, the second fitting surface (43) is in contact with the first fitting surface (33); the third guide surface (41) is located above the first guide surface (31); and the convex table surface is in contact with the second guide surface (32).

4. The adapter for MT-MT optical fiber jumper connection according to claim 2, characterized in that: A groove is provided on the adapter base (30) corresponding to the tail end of the socket channel (301), the depth and width of the groove are both greater than the socket channel (301), and the width of the groove is equal to the width of the convex step seat (14), so that a first step surface is formed at the connection between the groove and the socket channel (301), the length of the groove is equal to the length of the convex step seat (14), and the bottom surface of the adapter cover plate (40) is provided with a first limiting surface (42) connected to the third guide surface (41), the first limiting surface (42) is lower than the third guide surface (41) and forms a second step surface; After the adapter cover plate (40) is covered on the top surface of the adapter base (30), the first limiting surface (42) is located above the groove, and the height between the first limiting surface (42) and the groove is equal to the height of the convex step seat (14); the step formed between the second MT optical contact piece (13) and the convex step seat (14) is in contact with the first step surface and the second step surface, and is used to limit the front of the convex step seat (14), so that the second joint limiting cavity (302) for accommodating and limiting the circumferential side of the convex step seat (14) is formed between the groove and the first limiting surface (42), and the length of the second joint limiting cavity (302) is equal to the length of the convex step seat (14).

5. The adapter for MT-MT optical fiber jumper connection according to claim 4, characterized in that: A window is provided on the adapter base (30) at the rear end corresponding to the second joint limiting cavity (302), the window being higher than the groove and smaller in width than the groove, forming a third step surface for limiting the rear portion of the convex step seat (14), a second limiting surface (44) being provided at the rear end of the first limiting surface (42), and both sides of the second limiting surface (44) having a clearance groove (402), so that the width of the second limiting surface (44) is equal to the width of the window; After the adapter cover plate (40) is covered on the top surface of the adapter base (30), the second limiting surface (44) is located above the window, forming the second optical fiber channel (303) for the optical fiber jumper (11) to pass through.

6. The adapter for MT-MT optical fiber jumper connection according to any one of claims 2 to 5, characterized in that: The adapter base (30) is provided with two symmetrically distributed first positioning screw holes (304) on both sides corresponding to the socket channel (301), and the adapter cover plate (40) is provided with a first through hole (401) corresponding to the first positioning screw hole (304). A first screw (02) is installed in the first through hole (401) and the first positioning screw hole (304) for screwing the adapter base (30) and the adapter cover plate (40) together.

7. The adapter for MT-MT optical fiber jumper connection according to claim 6, characterized in that: The length of the adapter cover plate (40) is smaller than the length of the adapter base (30), and after the adapter cover plate (40) covers the top surface of the adapter base (30), the rear end of the adapter base (30) is flush with the rear end of the adapter cover plate (40), so that the front ends of the adapter base (30) and the adapter cover plate (40) form a stepped groove, the stepped groove is located at the head end of the socket channel (301), and is used to limit the position of the socket direction of the first MT optical contact (12) and the installation position of the adapter front cover (50).

8. The adapter for MT-MT optical fiber jumper connection according to claim 7, characterized in that: The head end of the adapter front cover (50) is provided with a stepped platform that cooperates with the stepped groove, and the stepped platform includes a second step surface (52) that fits with the head end of the adapter cover plate (40), a first step surface (51) that fits with the upper end surface of the adapter base (30), and a third fitting surface (53) that fits with the head end of the adapter base (30).

9. The adapter for MT-MT optical fiber jumper connection according to claim 1, characterized in that: The second positioning through groove further comprises a first optical fiber channel (503) arranged on the front side of the spring accommodating cavity (502) from the head end to the tail end along the socket direction, and the optical fiber jumper (11) passes through the first optical fiber channel (503) at the tail end.

10. The adapter for MT-MT optical fiber jumper connection according to claim 9, characterized in that: The mating surfaces of the adapter base (30) and the adapter front cover (50) are provided with symmetrically distributed second positioning screw holes (305) on both sides corresponding to the socket channel (301); the adapter front cover (50) is provided with spring accommodating cavities (502) parallel to the socket direction corresponding to the second positioning screw holes (305); second screws (03) are installed in the spring accommodating cavities (502) and the second positioning screw holes (305) for mating and fixing the adapter front cover (50), the adapter base (30) and the adapter cover plate (40).

11. The adapter for MT-MT optical fiber jumper connection according to claim 9, characterized in that: The cross section of the first optical fiber channel (503) is the same as the cross section of the second optical fiber channel (303).

12. The adapter for MT-MT optical fiber jumper connection according to claim 9, characterized in that: A notch (505) is provided on the peripheral outer wall of the adapter front cover (50), the notch (505) passing through the first connector limiting cavity (501), the spring accommodating cavity (502) and the first optical fiber channel (503), and enabling the optical fiber jumper (11) to enter the first optical fiber channel (503) from the outside of the adapter front cover (50) through the notch (505).

13. The adapter for MT-MT optical fiber jumper connection according to claim 9, characterized in that: A step surface (54) is provided on the inner wall of the second positioning through groove at a position corresponding to the spring accommodating cavity (502); the step surface (54) is distributed in the width direction of the spring accommodating cavity (502) and is used to abut against the rear end of the convex step seat (14), so that when the adapter front cover (50) is matched with the adapter base (30) and the adapter cover plate (40), the second MT optical contact piece (13) and the first MT optical contact piece (12) are plugged into place.

14. The adapter for MT-MT optical fiber jumper connection according to claim 1, characterized in that: The adapter base (30) is provided with more than four symmetrically distributed first positioning screw holes (304) on a side away from the adapter cover (40), and first screws (02) are screwed into the first positioning screw holes (304). The adapter cover (40) and the PCB board (01) are screwed and fixed via the first screws (02).

15. A method for connecting MT-MT optical fiber jumpers using the adapter for connecting MT-MT optical fiber jumpers according to claim 1, comprising the following steps: Step 1: Install the fixed part of the adapter: 1.1) Install the adapter base (30): fix the adapter base (30) to the PCB board (01); 1.2) Installing the second MT optical contact (13): installing the second MT optical contact (13) with the guide pin into the socket channel (301), and making the convex step seat (14) partly clamped in the second joint limiting cavity (302) to reach the limiting state in the socket direction, and the optical fiber jumper (11) partly passes through the second optical fiber channel (303) at the rear; 1.3) Installing the transfer cover (40): Installing the transfer cover (40) on the top of the transfer base (30) and fixing it so that the second MT optical contact (13) is completely restrained and fixed between the transfer base (30) and the transfer cover (40) without any movable margin; Step 2, socket joint: a spring (20) is mounted on the outer side of the optical fiber jumper (11) connected to the first MT optical contact (12), and the first MT optical contact (12) with the socket is moved along the socket channel (301) toward the second MT optical contact (13), and moved until the second MT optical contact (13) and the end faces of the first MT optical contact (12) are in contact; Step 3, installing the adapter front cover (50): insert the optical fiber jumper (11) into the first optical fiber channel (503) through the notch (505), and fix the adapter front cover (50) to the adapter base (30) by means of a second screw (03), wherein the spring (20) located in the adapter front cover (50) elastically presses the first MT optical contact (12), so that there is always elastic pressure between the first MT optical contact (12) and the second MT optical contact (13) in the direction of mutual insertion.

16. An adapter for MT-MT optical fiber jumper connection, characterized in that: include: An optical fiber jumper assembly (10), the optical fiber jumper assembly (10) comprising two groups of optical fiber jumpers (11) and a first MT optical contact (12) and a second MT optical contact (13) respectively arranged at the ends of the two groups of optical fiber jumpers (11) and capable of being plugged into each other to achieve optical coupling, the first MT optical contact (12) and the second MT optical contact (13) being arranged in the form of a cuboid with a rectangular cross-section, the tail ends of the first MT optical contact (12) and the second MT optical contact (13) both having a convex step seat (14) protruding outward in a circumferential direction, and a step is formed at the convex step seat (14); An adapter base (30) is arranged and fixed on the PCB board (01), and a through groove for limiting the second MT optical contact piece (13) and the convex step seat (14) is provided on the top surface; An adapter cover plate (40) is arranged to cover the top of the adapter base (30), clamp and fix the second MT optical contact (13) in the through groove, and form a first positioning through groove at the front end of the receiving groove for the first MT optical contact (12) to be plugged in; An adapter front cover (50) is detachably mounted on the front end of the adapter base (30) along the plug-in direction by means of a second screw (03), and can elastically press against the first MT optical contact piece (12) along the plug-in direction; Wherein, the length of the first MT optical contact (12) inserted into the first positioning through groove is less than the total length of the first MT optical contact (12).

17. The adapter for MT-MT optical fiber jumper connection according to claim 16, characterized in that: When the first MT optical contact piece (12) and the second MT optical contact piece (13) are inserted into each other to a mutually fitting position, the convex step seat (14) is located outside the insertion channel.

18. The adapter for MT-MT optical fiber jumper connection according to claim 16, characterized in that: The outer wall of the first MT optical contact (12) is fitted with the inner wall of the first positioning through groove.

19. The adapter for MT-MT optical fiber jumper connection according to claim 16, characterized in that: The adapter front cover (50) has a spring (20) installed in it and has a second positioning slot for accommodating the convex step seat (14), so that after the adapter front cover (50) is installed and fixed, the convex step seat (14) is located in the second positioning slot, and the spring (20) can elastically press the first MT optical contact (12) along the plugging direction.

20. The adapter for MT-MT optical fiber jumper connection according to claim 19, characterized in that: A notch (505) communicating with the second positioning through slot is provided on the peripheral side of the adapter front cover (50).

21. The adapter for MT-MT optical fiber jumper connection according to claim 16, characterized in that: The length of the adapter cover plate (40) is smaller than the length of the adapter base (30), so that a stepped groove is formed at the front end of the adapter base (30) and the adapter cover plate (40) after they are covered, and a stepped platform matching the stepped groove is provided at the head end of the adapter front cover (50).

22. The adapter for MT-MT optical fiber jumper connection according to claim 16, characterized in that: The invention comprises a plurality of adapter bases (30) uniformly arranged on the PCB board (01) along the width direction, and each of the adapter bases (30) is fixedly mounted with the adapter cover plate (40) for fixing the second MT optical contact piece (13), and the adapter front cover (50) for elastically pressing the first MT optical contact piece (12) is detachably mounted on the front side.

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