CN111367021B

CN111367021B - Waveguide-optical fiber coupling system between boards

Info

Publication number: CN111367021B
Application number: CN202010203038.4A
Authority: CN
Inventors: 韩道森; 王莹; 唐吉
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2022-05-20
Anticipated expiration: 2040-03-20
Also published as: CN111367021A

Abstract

The invention relates to an inter-board waveguide-optical fiber coupling system, which comprises an adapter board, a waveguide back board and a daughter board, wherein the waveguide back board is interconnected with the adapter board through a vertical waveguide connector on the board; the on-board vertical waveguide connector comprises a plug, a socket and a vertical steering contact; the board edge waveguide connector comprises a plug, a socket and a coupling part; an MT contact I and an MT contact II are respectively assembled in the board vertical waveguide connector plug and the board edge waveguide connector plug; the MT contact I and the vertical turning contact are aligned and inserted to realize waveguide-optical fiber coupling between the adapter plate and the waveguide backboard, and the coupling part and the MT contact II are aligned and inserted to realize waveguide-optical fiber coupling between the waveguide backboard and the daughter board, so that transmission of optical signals between the adapter plate and the daughter board is realized. The invention can realize no fiber on the board, has rich and flexible interconnection modes between boards, small installation space and convenient later maintenance.

Description

Waveguide-optical fiber coupling system between boards

Technical Field

The invention belongs to the technical field of optical signal propagation, and particularly relates to an inter-board waveguide-optical fiber coupling system.

Background

Currently, optical signal connection between a back plate and a daughter board or an adapter plate inside a chassis mostly adopts an optical fiber-optical fiber mode. One side of the optical fiber ribbon cable is coupled into the chip or the optical module on the back plate, the tail part of the other side of the optical fiber ribbon cable is connected with an optical fiber connector socket, and correspondingly, the daughter board or the adapter board is provided with a connector plug which is matched with the daughter board or the adapter board. The optical signal transmission between the back plate and the daughter board or the adapter plate is realized through the plug and the socket of the connector. Above this kind of application form, the optical fiber ribbon cable is located the backplate surface more, in case transmission density grade promotes, has that optic fibre distributes in a jumble, density is low, the crooked transmission performance and the reliability of influence of optic fibre, occupation installation space, be unfavorable for shortcoming such as later stage maintenance.

The waveguide connector in the form of waveguide-fiber coupling can solve the above disadvantages and realize the surface non-fibrillation of the optical backplane. At present, methods for realizing vertical coupling of waveguide and optical fiber mainly include an inclined mirror reflection method, a coupling element embedding method, a soft waveguide method, a bent optical fiber method, a waveguide grating method and the like. The methods are in a laboratory research stage, are not yet in commercial use, and generally have the defects of complex preparation process, high processing precision, low assembly efficiency, poor transmission consistency, low reliability and the like.

Disclosure of Invention

The invention provides an inter-board waveguide-optical fiber coupling system which can realize parallel or vertical interconnection between a waveguide back board and a daughter board and vertical interconnection between the waveguide back board and an adapter board on the function, has rich and flexible inter-board interconnection modes and greatly reduces the installation space in a case. The parallel or vertical coupling of optical waveguide signals and optical fiber signals can be realized in performance, no fibrillation on a board is realized, the operation difficulty is reduced, and the later maintenance is convenient.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides an inter-board waveguide-optical fiber coupling system, which comprises an adapter board, a waveguide back board and a daughter board, wherein the waveguide back board is vertically interconnected with the adapter board through a vertical waveguide connector on the board; the on-board vertical waveguide connector comprises an on-board vertical waveguide connector plug fixed on the adapter plate, an on-board vertical waveguide connector socket fixed on the waveguide back plate and a vertical steering contact piece which is assembled in the first waveguide port of the waveguide back plate and wrapped in the on-board vertical waveguide connector socket shell; the board edge waveguide connector comprises a board edge waveguide connector plug fixed on the daughter board, a board edge waveguide connector socket fixed on the waveguide backboard and a coupling part assembled in a second waveguide port of the waveguide backboard; an MT contact I is assembled in the vertical waveguide connector plug on the board, an MT contact II is assembled in the edge waveguide connector plug on the board, and the quantity and the structure of inserting cores of the MT contact I and the MT contact II are the same; the waveguide backboard is provided with a waveguide passage which is pressed on the inner layer of the PCB and is communicated with the first waveguide port and the second waveguide port, and the first waveguide section and the second waveguide section at the two ends of the waveguide passage respectively correspond to the first waveguide port and the second waveguide port; the MT contact I and the vertical turning contact are aligned and plugged together after the vertical waveguide connector headstock on the board is plugged, so that waveguide-optical fiber vertical coupling between the adapter board and the waveguide back board is realized, the coupling part and the MT contact II are aligned and plugged together after the waveguide connector headstock at the edge of the board is plugged, so that waveguide-optical fiber parallel coupling between the waveguide back board and the daughter board is realized, and therefore transmission of optical signals between the adapter board and the daughter board is finally realized.

Further, the vertical steering contact element comprises a bare optical fiber, an FA module and a vertical steering module adhered with the FA module, wherein the vertical steering module is provided with a first array lens, a second array lens, a prism with a light vertical steering function and a guide pin I which is used for matching with a guide pin hole on the MT contact element I, and the prism is positioned between the first array lens and the second array lens.

Furthermore, one end of the bare fiber penetrates into the FA module to be fixed and is in one-to-one correspondence with the first array lens on the vertical turning module, and the other end of the bare fiber is assembled in the V-shaped groove I for embedding the bare fiber and is in one-to-one correspondence with the first waveguide section; the V-shaped grooves I are arranged in the first waveguide port, the number of the V-shaped grooves I is equal to that of the sections of the first waveguides, and the V-shaped grooves I correspond to the sections of the first waveguides one by one; the FA module is further provided with a key groove used for being matched with a convex key at the bottom of the cover plate, and the bottom of the cover plate is further provided with a V-shaped groove II which is correspondingly matched with the V-shaped groove I to protect the embedded bare optical fiber.

Furthermore, a first glue injection hole and a second glue injection hole are formed in the coupling part, and the guide pin II is fixed on the coupling part through injecting epoxy glue into the first glue injection hole and curing; UV glue is injected into the second glue injection hole for curing, so that the coupling part is fixed in the second waveguide port, and epoxy glue is injected into the back glue injection hole of the waveguide back plate for secondary reinforcement, so that the packaging reliability of the coupling part is ensured; the guide pin II is used for being matched with a guide pin hole on the MT contact piece II to play a role in guiding the MT contact piece II and the coupling part to be inserted and combined.

Further, the packaging position of the coupling part in the second waveguide port is determined by an MT parallel debugging tool which comprises an MT fixing clamp, a baffle fixed on the MT fixing clamp and a spring clamped between the baffle and the MT fixing clamp.

Furthermore, one end of the spring is arranged in a round hole on the MT fixing clamp to prevent the spring from deviating, and the other end of the spring is tightly propped against the inner wall of the baffle; the MT contact II is tightly clamped in the MT fixing clamp under the action of the spring, so that the debugging of the packaging position of the coupling part is facilitated.

Further, the waveguide backplane and the daughter boards are interconnected in parallel or in perpendicular by board edge waveguide connectors.

Furthermore, a guide post I is also arranged on the on-board vertical waveguide connector socket and is used for being matched with a guide hole I on the waveguide back plate, the on-board vertical waveguide connector socket is fixed on the waveguide back plate under the guiding of the matching of the guide post I and the guide hole I, the first waveguide port is just covered, and the vertical turning contact piece is wrapped in the inner cavity of the on-board vertical waveguide connector socket shell; the board edge waveguide connector socket is also provided with a guide post II which is used for being matched with a guide hole II on the waveguide backboard, the board edge waveguide connector socket is fixed on the waveguide backboard under the guide of the matching of the guide post II and the guide hole II to just cover the second waveguide port and wrap the coupling part in the inner cavity of the board edge waveguide connector socket shell so as to protect the cleanness of the section of the second waveguide.

Further, according to the series development situation, a plurality of MT contacts I are assembled in parallel in the vertical waveguide connector plug on the board, a plurality of MT contacts II are assembled in parallel in the waveguide connector plug at the edge of the board, a waveguide passage consistent with the total number of the inserting cores of the MT contacts I is arranged on the waveguide back board, and the number of the first array lens, the number of the second array lens, the number of the bare fibers and the number of the V-shaped grooves I are the same as the number of the waveguide passages; the sizes of the vertical steering contact, the coupling part, the first waveguide port, the second waveguide port, the plug housings and the socket housings of all the connectors are correspondingly increased, and the transmission of optical signals between the adapter plate and the daughter board is realized.

The invention has the beneficial effects that:

(1) the invention sets a waveguide channel in a waveguide backboard, two ends of the waveguide channel are communicated with two waveguide ports, a vertical turning contact and a coupling part are respectively assembled in the two waveguide ports, a vertical waveguide connector on a board is used between an adapter board and the waveguide backboard to enable the two to be vertically interconnected, and a board edge waveguide connector is used between the waveguide backboard and a daughter board to enable the two to be parallelly interconnected or vertically interconnected. The MT contact in the plug of the vertical waveguide connector on the board can be plugged with the vertical steering contact to realize the vertical steering of the optical signal, so that the waveguide-optical fiber vertical coupling between the waveguide back board and the adapter board is realized; the MT contact in the board edge waveguide connector plug can be plugged with a coupling part to realize waveguide-optical fiber parallel coupling between the waveguide back board and the daughter board, and finally, transmission of optical signals between the adapter board and the daughter board is realized.

(2) The invention can functionally realize the parallel or vertical interconnection between the waveguide back plate and the daughter board and the vertical interconnection between the waveguide back plate and the adapter plate, the interconnection mode between the boards is rich and flexible, and the installation space in the case can be greatly reduced. The parallel or vertical coupling of optical waveguide signals to optical fiber signals can be realized in performance.

(3) The invention can realize no fibrillation on the plate, has small installation space, is convenient to maintain and greatly reduces the operation difficulty. The internal structures of the plugs of the on-board vertical waveguide connector, the board edge parallel waveguide connector and the board edge vertical waveguide connector are the same, and the connectors are high in universality and standardization degree; the connector can be inserted in a blind mode, and operation is convenient. The floating mechanism is arranged on the plug connector, so that floating connection between the boards can be realized. The packaging mode of the coupling part adopts the mode of actively aligning the coupling part and the waveguide port and is matched with an automatic coupling packaging platform, and the packaging mode is adjusted by means of an MT parallel debugging tool, so that the operation is easy and the assembly efficiency is high.

Drawings

Fig. 1 is a schematic diagram of a first application example of the present invention.

Fig. 2 is a schematic diagram of a second application example of the present invention.

Fig. 3 is an exploded view of fig. 1.

Fig. 4 is an exploded view of fig. 2.

Fig. 5 is an exploded view of an on-board vertical waveguide connector.

Fig. 6 is a cross-sectional view of a vertical waveguide connector on a board, in which (a) is a longitudinal cut view and (b) is a transverse cut view.

Fig. 7 is a cut-away view of a board edge vertical waveguide connector, where (a) is a longitudinal cut and (b) is a transverse cut.

Fig. 8 is a cut-away view of a board edge parallel waveguide connector, where (a) is a longitudinal cut-away view and (b) is a transverse cut-away view.

Fig. 9 is a schematic structural diagram of a waveguide backplane.

FIG. 10 is a schematic view of the structure of a vertical steering contact and V-groove I.

Fig. 11 is a schematic structural view of the cover plate.

FIG. 12 is a cut-away view of the vertical steering module.

Fig. 13 is a schematic diagram of a first waveguide cross-section.

Fig. 14 is a schematic view of a coupling component and a second waveguide port.

Fig. 15 is a schematic structural diagram of an MT parallel debugging tool.

Fig. 16 is an exploded view of fig. 15.

[ reference numerals ]:

1-an interposer, 2-a waveguide backplane, 3-a daughter board, 4-a first screw assembly, 5-an on-board vertical waveguide connector plug, 6-a second screw assembly, 7-an on-board vertical waveguide connector receptacle, 8-a first waveguide port, 9-an outer housing, 10-an inner housing, 11-a snap, 12-a snap, 13-a slider, 14-a spring, 15-a snap hook i, 16-a boss i, 17-a snap hook ii, 18-a boss ii, 19-a floating screw, 20-a kidney, 21-a kidney, 22-a floating screw first step, 23-a board edge parallel waveguide connector, 24-a board edge vertical waveguide connector, 25-a board edge waveguide connector plug, 26-a board edge waveguide connector receptacle, 27-a third screw assembly, 28-a fourth screw assembly, 29-a dust cap, 30-MT contact i, 31-MT contact ii, 32-an on-board vertical waveguide connector, 33-a waveguide channel, 34-a first waveguide cross-section, 35-a second waveguide cross-section, 36-bare fiber, 37-V-groove i, 38-FA module, 39-a vertical turning module, 40-a first array lens, 41-a second array lens, 42-a prism, 43-a key groove, 44-a convex key, 45-a cover plate, 46-V-groove ii, 47-guide pin i, 48-a coupling part, 49-guide pin i, 50-guide hole i, 51-a first glue injection hole, 52-a second glue injection hole, 53-guide pin ii, 54-a second waveguide port, 55-back glue dispensing hole, 56-fifth screw component, 57-MT fixing clamp, 58-pin, 59-baffle, 60-spring, 61-six-dimensional adjusting frame mounting position, 62-round hole, 63-guide post II and 64-guide hole II.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, features and effects of the waveguide-fiber coupling system between boards according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1 and 2, the waveguide backplane comprises an adapter board 1, a waveguide backplane 2 and a daughter board 3, wherein the adapter board and the waveguide backplane are vertically interconnected through an on-board vertical waveguide connector 32, and the waveguide backplane and the daughter board are parallelly interconnected or vertically interconnected through a board edge waveguide connector; the on-board vertical waveguide connector comprises an on-board vertical waveguide connector plug 5 fixed to the interposer by a first screw assembly 4, an on-board vertical waveguide connector receptacle 7 fixed to the waveguide backplane by a second screw assembly 6, and vertical turning contacts fitted within a first waveguide port 8 of the waveguide backplane.

The on-board vertical waveguide connector plug comprises an outer shell 9, an inner shell 10 assembled in the outer shell and an MT contact assembled in the inner shell, as shown in fig. 5, a buckle 11 on the MT contact is clamped in a clamping groove 12 of the inner shell and then fixed in the outer shell together with a sliding block 13 and a spring 14, an elastic hook I15 on the inner shell is matched and locked with bosses I16 on the inner walls of the upper side and the lower side of the outer shell, and finally the plug is fixed on an adapter plate through reverse installation of a first screw component 4. When the head seat is plugged, the elastic hook II 17 on the socket shell is matched with the boss II 18 on the inner shell to realize the locking and the separation of the vertical waveguide connector socket and the plug on the board, namely the locking and the separation of the waveguide back board and the adapter board. The outer shell of the on-board vertical waveguide connector plug is further provided with a floating screw 19, a waist-shaped groove 20 is arranged in the floating screw mounting groove and used for achieving floating of the floating screw in the X direction (namely the radial direction of the floating screw), and the waist-shaped groove step 21 is matched with a first step 22 at one end of the floating screw to achieve floating of the floating screw in the Y direction (namely the axial direction of the floating screw), so that floating in the X, Y direction between the adapter plate and the waveguide back plate is achieved. The other end of the floating screw is provided with a screw hole for being matched with the first screw component 4 to fix the plug of the vertical waveguide connector on the board on the adapter board. When the headstock of the vertical waveguide connector on the board is separated, the elastic hook II 17 is separated from the boss II 18, and the inner shell floats towards one end far away from the socket under the action of the spring 14, so that the floating between the adapter plate and the waveguide back plate in the Z direction (namely the plugging direction of the headstock of the connector) is realized.

The board edge waveguide connector includes two types, namely, a board edge parallel waveguide connector 23 and a board edge vertical waveguide connector 24, and the waveguide backplane and the daughter board are interconnected in parallel through the board edge parallel waveguide connector, as shown in fig. 1, or the waveguide backplane and the daughter board are interconnected vertically through the board edge vertical waveguide connector, as shown in fig. 2. The board edge parallel waveguide connector and the board edge perpendicular waveguide connector each include a plug, a receptacle, and a coupling feature 48 that is encapsulated within the waveguide backplane second waveguide port 54. The internal structures of the plug and the socket are the same, the shapes of the plug outer shell are different, and the shapes of the plug are respectively suitable for the installation of the daughter boards which are interconnected with the waveguide backplane in parallel or the daughter boards which are interconnected with the waveguide backplane vertically, as shown in fig. 7-8. For convenience of description, the plugs of the board-edge parallel waveguide connector and the board-edge vertical waveguide connector are collectively referred to as board-edge waveguide connector plugs 25, and the sockets of the board-edge parallel waveguide connector and the board-edge vertical waveguide connector are collectively referred to as board-edge waveguide connector sockets 26.

The board edge waveguide connector plug is secured to the daughterboard by a third screw assembly 27 and the board edge waveguide connector jack is secured to the waveguide backplane by a fourth screw assembly 28. The internal structure of the board edge waveguide connector plug is the same as that of the board vertical waveguide connector plug, and the board edge waveguide connector plug also comprises an outer shell, an inner shell, an MT contact piece, a buckle, a clamping groove matched with the buckle, a sliding block, a spring, an elastic hook I, a boss II, a floating screw and the like. And the board edge waveguide connector socket is also provided with an elastic hook II which is used for being matched with a boss II in the board edge waveguide connector plug and is used for locking and separating the board edge waveguide connector head seat, so that the locking and the separation between the waveguide back plate and the daughter board are realized. The board edge waveguide connector socket is also provided with a dustproof cap 29, when the head seat is plugged, the dustproof cap is manually rotated to insert the MT contact of the plug, and after the head seat is separated, the dustproof cap automatically rotates and resets under the action of the spring and the transmission piece.

For convenience of description, the MT contact in the vertical waveguide connector plug on the board is defined as MT contact i 30, the MT contact in the edge waveguide connector plug on the board is defined as MT contact ii 31, and the number and the structure of the ferrules of the MT contact i and the MT contact ii are the same. The floating screw 19 with the same function and the floating screw mounting groove with the same structure are also arranged on the outer shell of the board edge waveguide connector plug, so that floating connection between the waveguide back board and the daughter board in the direction of X, Y, Z can be realized.

The first waveguide port for assembling the vertical steering contact and the second waveguide port for packaging the coupling part are respectively arranged at two ends of the waveguide back plate, a waveguide passage 33 on the waveguide back plate is pressed in the inner layer of the polymer PCB and communicated with the first waveguide port and the second waveguide port, and a first waveguide section 34 and a second waveguide section 35 at two ends of the waveguide passage respectively correspond to the first waveguide port and the second waveguide port. A row of waveguide channels are prepared by adopting a photoetching method or a scraper method, the waveguide channels are used for being matched with a standard MT insertion core, the number of the rows of waveguide channels is at most 12 or 16, and the distance is 0.25 um. A row of V-shaped grooves I37 with proper length for embedding bare fibers 36 are engraved on the step in the first waveguide port along one side of the section of the first waveguide, the number of the V-shaped grooves I is consistent with that of the waveguide passages, the V-shaped grooves I correspond to the section of the first waveguide one by one, and the number of the waveguide passages is consistent with that of the bare fibers and that of the insertion cores of the MT contact pieces I.

The vertical turn contact fitted in the first waveguide port includes a bare fiber 36, an FA module 38, and a vertical turn module 39 bonded to the FA module, and the vertical turn module is provided with a first array lens 40, a second array lens 41, and a prism 42 having a 45 ° slope with a 90 ° turn function. One end of the bare fiber penetrates into the FA module to be fixed and corresponds to the first array lenses on the vertical turning module one by one, and the other end of the bare fiber is assembled in the corresponding V-shaped groove I and corresponds to the first waveguide section one by one for optical signal transmission. The FA module is further provided with a semicircular key groove 43 which is used for being matched with a semicircular convex key 44 at the bottom of a cover plate 45, and a V-shaped groove II 46 which is correspondingly matched with the V-shaped groove I and used for protecting pre-buried bare fibers is further arranged at the bottom of the cover plate. Guide pins I47 are also provided on the vertical turning module to cooperate with guide pin holes on the MT contacts I to ensure that the second array lens 41 is aligned with the optical fibers in the MT contacts I. And after the vertical steering contact element is assembled to the first waveguide port and the bare fiber is embedded, the cover plate is covered on the FA module and fixed, and then glue solution is injected into a gap between the vertical steering contact element and the waveguide back plate to ensure that the vertical steering contact element is completely cured in the first waveguide port.

And the vertical waveguide connector socket on the board is also provided with a guide post I49 which is used for being matched with a guide hole I50 on the waveguide back board, and the vertical steering contact piece fixes the vertical waveguide connector socket on the board on the waveguide back board under the guide of the guide post I and the guide hole I after the first waveguide port is assembled, just covers the first waveguide port and wraps the vertical steering contact piece in the inner cavity of the vertical waveguide connector socket shell on the board.

The shape and size of the coupling part are matched with those of the second waveguide port, the coupling part is provided with a first glue injection hole 51 and a second glue injection hole 52, 6 first glue injection holes and 4 second glue injection holes are shown in fig. 14, and after the guide pin II 53 is arranged in the coupling part, epoxy glue is injected into the first glue injection holes and placed on a drying table to be cured at an accelerated speed, so that the guide pin II is fixed on the coupling part and is tightly matched with the coupling part. The guide pin II 53 is used for matching with a guide pin hole on the MT contact II to play a role in guiding the MT contact II and the coupling part to be inserted and combined.

The packaging position of the coupling part in the second waveguide port is determined through an MT parallel debugging tool, an MT contact II is firstly guided to be inserted and combined with the coupling part through a guide pin II, the MT contact II and the coupling part are assembled and fixed on the MT parallel debugging tool after being inserted and combined, an MT fixing clamp on the tool is installed and fixed on a six-dimensional adjusting frame (the six-dimensional adjusting frame is not drawn on figures 15-16), and the position of the coupling part in the waveguide port is indirectly controlled by controlling the displacement and the angle of the six-dimensional adjusting frame in 6 directions through an automatic coupling packaging platform. After the packaging position of the coupling part at the second waveguide port is debugged, the coupling part is packaged, and before packaging, a layer of strippable solder mask is coated on the section of the second waveguide, so that the influence on loss caused by pollution caused by the fact that glue solution flows to the section of the waveguide in the later period is prevented. And injecting UV glue into the second glue injection hole of the coupling part, and curing by using an ultraviolet lamp so as to preliminarily fix the coupling part in the second waveguide port. After the coupling part is cured, the MT contact is taken down, the waveguide back plate is reversed, and epoxy glue is injected into the glue dispensing hole 55 on the back surface of the waveguide back plate for secondary reinforcement, so that the packaging reliability of the coupling part is ensured.

The MT parallel debugging tool comprises an MT fixing clamp 57 fixed on a six-dimensional adjusting frame through a fifth screw assembly 56, a baffle plate 59 fixed on the MT fixing clamp through a pin 58 and a spring 60 clamped between the baffle plate and the MT fixing clamp. The mounting position 61 of the six-dimensional adjusting bracket is shown in fig. 16, one end of the spring is arranged in a round hole 62 on the MT fixing clamp to prevent the spring from deviating, and the other end of the spring is pressed against the inner wall of the baffle. After the baffle is installed, the baffle can rotate around the pin properly under the action of the elastic force of the spring, and when the spring is compressed, the baffle rotates in opposite phases to enable the clamping distance of the MT fixing clamp for clamping the MT contact element II to be increased. The MT contact II can be tightly clamped in the MT fixing clamp through the spring, so that the debugging of the packaging position of the coupling part is facilitated.

After the coupling parts are packaged in the second waveguide port, the board edge waveguide connector socket is assembled and fixed on the waveguide backboard through the fourth screw assembly 28 under the guiding of the guide post II 63 of the board edge waveguide connector socket and the guide hole II 64 on the waveguide backboard, and the second waveguide port is just covered and the coupling parts are wrapped in the inner cavity of the board edge waveguide connector socket shell to protect the cleanness of the section of the second waveguide and prevent the second waveguide from being affected by dirt. The second waveguide section 35 is located at one end of the waveguide backplane as shown in fig. 14. The MT contact ii is fitted into the board edge waveguide connector plug housing, which is then secured to the daughter board by a third screw assembly. And after the board edge waveguide connector headstock is plugged, the MT contact II and the coupling part are plugged under the guidance of the guide pin II and the guide pin hole, so that the optical signal of the second waveguide section is coupled with the optical fiber in the MT contact II in parallel.

The sizes of the grooves of the vertical steering contact element accommodating cavity (the first waveguide port) and the coupling part accommodating cavity (the second waveguide port) are ensured by laminating printed boards layer by layer, and screw mounting holes, guide holes, glue dispensing holes and the like on the boards are drilled by adopting mechanical processing modes such as a later-stage drilling machine and the like.

The following describes the implementation of waveguide-fiber coupling and optical signal transmission between boards in detail by using fig. 1 as an example:

in the example shown in FIG. 1, the interposer is vertically interconnected with the waveguide backplane by an on-board vertical waveguide connector, and the daughterboard is parallel interconnected with the waveguide backplane by an on-board edge parallel waveguide connector; after a vertical waveguide connector plug and a socket on a board are plugged in an opposite mode, an MT contact I in the vertical waveguide connector plug on the board is plugged in an opposite mode with a vertical steering contact, light spots emitted by optical fibers of the MT contact I enter a second array lens, are vertically steered through a prism with a 90-degree steering function, then emit light from the first array lens and are interconnected with bare optical fibers in an FA module, optical signals are transmitted through the bare optical fibers and coupled with a first waveguide section, the optical signals are transmitted through a waveguide passage and coupled with optical fibers of an MT contact II in a parallel waveguide connector plug at the edge of the board through a second waveguide section, and finally the optical signals are transmitted to a daughter board from an adapter plate. Of course, the optical signal may be transferred from the daughter board to the interposer according to the same principle.

In the example shown in FIG. 2, the interposer is vertically interconnected with the waveguide backplane by an on-board vertical waveguide connector, and the daughterboard is vertically interconnected with the waveguide backplane by an on-board edge vertical waveguide connector; since the assembly of the coupling components and the vertical turning contact is not changed, the internal structures of the board edge vertical waveguide connector and the board edge parallel waveguide connector are the same, and the transmission process of the optical signal in this example is the same as that in the example shown in fig. 1, and is not described again.

In the invention, fig. 1 and fig. 2 only take the assembly of one MT contact as an example, according to the series development situation, a plurality of MT contacts i can be assembled in parallel in a vertical waveguide connector plug on a board, a plurality of MT contacts ii can be assembled in parallel in a waveguide connector plug at the edge of the board, and a waveguide path which is consistent with the total number of ferrules of the plurality of MT contacts i is arranged on a waveguide backboard, and the number of first array lenses, second array lenses, bare fibers and V-shaped grooves is the same as the number of waveguide paths. The sizes of the vertical turning contact piece, the coupling part, the first waveguide port, the second waveguide port, the plug shell and the socket shell of all the connectors are correspondingly increased to adapt to a plurality of parallel waveguide channels and MT contact pieces. For example, according to the situation, 2 MT contacts i with 12 cores can be assembled in parallel in the vertical waveguide connector plug on the board, 2 MT contacts ii with 12 cores can be assembled in parallel in the waveguide connector plug at the edge of the board, the number of the waveguide path, the first array lens, the second array lens, the bare fiber, the V-shaped groove i and the V-shaped groove ii is 24, the sizes of the vertical turning contact, the coupling part, the first waveguide port, the second waveguide port, the plug shells and the socket shells of all the connectors are correspondingly increased, and the series of waveguide-fiber coupling between boards and the transmission of optical signals between the adapter board and the sub-board can be completely adapted.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any simple modifications, equivalents and modifications made by the above embodiments according to the technical spirit of the present invention are within the scope of the present invention without departing from the technical spirit of the present invention.

Claims

1. An inter-board waveguide-optical fiber coupling system is characterized by comprising an adapter board (1), a waveguide back board (2) vertically interconnected with the adapter board through an on-board vertical waveguide connector, and a daughter board (3) parallelly or vertically interconnected with the waveguide back board through an on-board edge waveguide connector; the adapter plate (1) and the daughter board (3) are perpendicular to each other, and the waveguide back plate (2) is arranged between the adapter plate (1) and the daughter board (3);

the on-board vertical waveguide connector comprises an on-board vertical waveguide connector plug fixed on the adapter plate (1), an on-board vertical waveguide connector socket fixed on the waveguide back plate and a vertical steering contact piece which is assembled in a first waveguide port (8) of the waveguide back plate and wrapped in a shell of the on-board vertical waveguide connector socket;

the board edge waveguide connector comprises a board edge waveguide connector plug fixed on the daughter board, a board edge waveguide connector socket fixed on the waveguide backplane, and a coupling part (48) assembled in a second waveguide port (54) of the waveguide backplane;

an MT contact I is assembled in the vertical waveguide connector plug on the board, an MT contact II is assembled in the edge waveguide connector plug on the board, and the quantity and the structure of inserting cores of the MT contact I and the MT contact II are the same; the waveguide backboard is provided with a waveguide passage (33), the waveguide passage is pressed on the inner layer of the PCB and is communicated with the first waveguide port (8) and the second waveguide port (54), and a first waveguide section (34) and a second waveguide section (35) at two ends of the waveguide passage respectively correspond to the first waveguide port (8) and the second waveguide port (54);

after the head seat of the vertical waveguide connector on the board is plugged, the MT contact I and the vertical steering contact are aligned and plugged to realize waveguide-optical fiber vertical coupling between the adapter board (1) and the waveguide back board (2), and after the head seat of the waveguide connector on the edge of the board is plugged, the coupling part and the MT contact II are aligned and plugged to realize waveguide-optical fiber parallel coupling between the waveguide back board (2) and the daughter board (3), so that the vertical transmission of optical signals between the adapter board and the daughter board is finally realized;

the on-board vertical waveguide connector plug and the board edge waveguide connector plug respectively comprise an outer shell (9), floating screws (19) are arranged on the outer shell, waist-shaped grooves (20) are formed in the floating screw mounting grooves and used for achieving radial floating of the floating screws (19), the waist-shaped groove steps (21) are matched with first steps (22) at one ends of the floating screws to achieve axial floating of the floating screws, and therefore floating connection between the on-board vertical waveguide connector and the adapter plate and between the board edge waveguide connector and the daughter board is achieved.

2. The interplate waveguide-fiber coupling system according to claim 1, wherein the vertical turn contact member comprises a bare fiber (36), an FA module (38), and a vertical turn module (39) bonded to the FA module, the vertical turn module having a first array lens (40), a second array lens (41), a prism having a light vertical turning function between the first array lens and the second array lens, and guide pins i (47) for fitting into guide pin holes of the MT contact i.

3. The interplate waveguide-fiber coupling system according to claim 2, wherein one end of the bare fiber is inserted into the FA module and fixed in one-to-one correspondence with the first array lens on the vertical turning module, and the other end is assembled in a V-groove i (37) for pre-embedding the bare fiber and in one-to-one correspondence with the first waveguide section (34); the V-shaped grooves I are arranged in the first waveguide port, the number of the V-shaped grooves I is equal to that of the sections of the first waveguides, and the V-shaped grooves I correspond to the sections of the first waveguides one by one; the FA module is further provided with a key groove used for being matched with a convex key at the bottom of the cover plate, and the bottom of the cover plate is further provided with a V-shaped groove II (46) which is correspondingly matched with the V-shaped groove I and used for protecting the pre-buried bare optical fiber.

4. The waveguide-fiber coupling system between boards of claim 1, wherein the coupling part is provided with a first glue injection hole (51) and a second glue injection hole (52), and the guide pin ii (53) is fixed on the coupling part by injecting epoxy glue into the first glue injection hole and curing; UV glue is injected into the second glue injection hole for curing, so that the coupling part is fixed in the second waveguide port, and epoxy glue is injected into the back glue injection hole of the waveguide back plate for secondary reinforcement, so that the packaging reliability of the coupling part is ensured; the guide pin II is used for being matched with a guide pin hole on the MT contact piece II to play a role in guiding the MT contact piece II and the coupling part to be inserted and combined.

5. The interplate waveguide-fiber coupling system according to claim 1, wherein the packaging position of the coupling component in the second waveguide port is determined by an MT parallel commissioning fixture including an MT fixation clamp (57), a stop plate (59) fixed to the MT fixation clamp, and a spring (60) sandwiched between the stop plate and the MT fixation clamp; one end of the spring is arranged in a round hole (62) on the MT fixing clamp to prevent the spring from shifting, and the other end of the spring is tightly propped against the inner wall of the baffle; the MT contact II is tightly clamped in the MT fixing clamp under the action of the spring, so that the debugging of the packaging position of the coupling part is facilitated.

6. The interplate waveguide-fiber coupling system according to claim 1, wherein the on-board vertical waveguide connector receptacle is further provided with a guide post i (49) for mating with a guide hole i (50) of the waveguide backplane, and the on-board vertical waveguide connector receptacle is fixed to the waveguide backplane under the guiding of the mating of the guide post i and the guide hole i to just cover the first waveguide port and wrap the vertical turning contact in the inner cavity of the on-board vertical waveguide connector receptacle housing; and the board edge waveguide connector socket is also provided with a guide post II (63) which is used for being matched with a guide hole II (64) on the waveguide backboard, is fixed on the waveguide backboard under the guide of the matching of the guide post II and the guide hole II and just covers the second waveguide port, and wraps the coupling part in the inner cavity of the board edge waveguide connector socket shell so as to protect the cleanness of the section of the second waveguide.

7. The interplate waveguide-fiber coupling system according to claim 1, wherein according to series development, a plurality of MT contacts i are assembled in parallel in a vertical waveguide connector plug on a board, a plurality of MT contacts ii are assembled in parallel in a waveguide connector plug at an edge of the board, a waveguide backplane is provided with waveguide paths in accordance with the total number of ferrules of the MT contacts i, and the number of the first array lenses, the second array lenses, the bare fibers and the V-shaped grooves i is the same as the number of the waveguide paths; the sizes of the vertical steering contact, the coupling part, the first waveguide port, the second waveguide port, the plug housings and the socket housings of all the connectors are correspondingly increased, and the transmission of optical signals between the adapter plate and the daughter board is realized.