CN106199832B - Optical waveguide plate and optical fiber coupling connection method, optical waveguide plate and communication transmission system - Google Patents
Optical waveguide plate and optical fiber coupling connection method, optical waveguide plate and communication transmission system Download PDFInfo
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- CN106199832B CN106199832B CN201510233217.1A CN201510233217A CN106199832B CN 106199832 B CN106199832 B CN 106199832B CN 201510233217 A CN201510233217 A CN 201510233217A CN 106199832 B CN106199832 B CN 106199832B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/13—Integrated optical circuits characterised by the manufacturing method
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/30—Optical coupling means for use between fibre and thin-film device
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Abstract
The invention provides a coupling connection method of an optical waveguide plate and an optical fiber, the optical waveguide plate and a communication transmission system, and belongs to communication systems. And processing a connecting groove on the optical waveguide plate, wherein the bottom of the groove comprises a core layer of the optical waveguide, and the optical fiber connecting end is embedded into the connecting groove to ensure that the core layer of the optical fiber is in butt joint with the core layer of the optical waveguide. Compared with the prior art, the butt joint of the core layer of optic fibre and the core layer of optical waveguide is carried out to the recess that inserts optical waveguide board core layer both sides through the guide pin, but processing forms connecting groove on the optical waveguide board, the optical fiber link is directly acceptd to this recess, let the core layer of optic fibre and the direct butt joint of the core layer of optical waveguide board, alignment that can be accurate is connected, be difficult to receive vibrations, the influence of environmental external force such as collision, can improve the core layer of optic fibre and the alignment precision of optical waveguide board core layer, and then transmission stability when carrying out communication transmission improves. And, need not to take the optical fiber link to have the guide pin, can make optical fiber link processing simple, improve the core competitiveness of product.
Description
Technical Field
The invention relates to the field of communication, in particular to a coupling connection method of an optical waveguide plate and an optical fiber, the optical waveguide plate and a communication transmission system.
Background
The rapid development of broadband communication, supercomputers and large data centers continuously pushes the high-speed increase of information transmission bandwidth, the traditional electric interconnection technology has more and more prominent limitations in the aspects of bandwidth, distance, energy consumption and the like, the electric interconnection technology with the transmission bandwidth of 10Gbps can only realize the information transmission with the distance of 0.3-1 m approximately, and the technology has no capacity for the high-speed interconnection of 25Gbps, 40Gbps and the like. In recent years, the interconnection technology of the optical printing backboard based on the optical waveguide theory is gradually developed, and is increasingly widely researched at home and abroad, and is expected to be comprehensively applied and popularized in the next years. Compared with the electrical interconnection technology, the optical printing backboard interconnection technology has outstanding advantages in the aspects of data transmission, green energy conservation, manufacturing cost, interconnection density and the like, has great potential in the application between a daughter board and a backboard, between high-speed chips and between a high-speed chip and a high-capacity memory, and can powerfully promote the technical popularization in emerging fields such as three-network integration, mobile internet, internet of things, cloud computing and the like. At present, the research focus of the optical interconnection technology is to improve the transmission performance of the light guide plate preparation and to realize the optical waveguide-optical fiber coupling connection technology.
In an optical printing backboard transmission system, the coupling connection performance of an optical waveguide-optical fiber plays a very critical role in the stable operation of the transmission system, and factors influencing the coupling connection performance of the optical waveguide-optical fiber mainly include the smoothness degree of the optical fiber and the end face of the optical waveguide, the longitudinal deviation, the axial deviation and the angular deviation of the butt coupling of the optical waveguide-optical fiber, the optical fiber and the end face of the optical waveguide are easily polluted when the system operates for a long time, the alignment deviation of the optical waveguide-optical fiber connection of the system caused by external environmental forces such as vibration, collision and the like can increase the transmission loss of the optical waveguide to a certain extent, so the stability of the transmission system is reduced to a certain extent.
Currently, coupling technology is widely used. Coupling techniques are generally implemented by means of fiber optic connection techniques that are well-established in the field of communications, and fiber optic jumpers, which are commonly used for optical waveguide-fiber connection coupling, are generally provided with MPO interfaces and MT-RJ interfaces. The coupling connection packaging method mainly comprises the steps of firstly, etching square grooves on two sides of a group of 12 channels of an optical waveguide back plate for packaging by using a laser, enabling the space between the square grooves to be just inserted into a guide pin inserted on an optical fiber jumper wire connector, accurately adjusting the alignment precision of an optical fiber and the optical waveguide by using a 6-dimensional adjusting frame, then solidifying the guide pin in the groove by using ultraviolet glue, and simultaneously needing a glue solidification adapter so as to be convenient for the optical fiber connector to be clamped and fixed with the guide pin. Because the guide pin is used for fixing, the optical waveguide-optical fiber alignment device is easily influenced by external environmental forces such as vibration, collision and the like, and the optical waveguide-optical fiber alignment deviation can be caused, so that the stable operation of an optical interconnection backboard transmission system is influenced.
Disclosure of Invention
The invention aims to solve the main technical problem of providing a coupling connection method of an optical waveguide plate and an optical fiber, the optical waveguide plate and a communication transmission system, and solving the problem of poor alignment between the optical waveguide plate and the optical fiber and further poor transmission stability during communication transmission in the prior art.
In order to solve the above problems, the present invention provides a method for coupling and connecting an optical waveguide plate and an optical fiber, comprising:
processing and forming a connecting groove on an optical waveguide plate, wherein the bottom of the groove comprises a core layer of the optical waveguide;
and embedding the optical fiber connecting end into the connecting groove to enable the core layer of the optical fiber to be in butt joint with the core layer of the optical waveguide.
In one embodiment of the present invention, the processing and forming the coupling groove on the optical waveguide plate includes: defining a processing region on an optical waveguide plate, the processing region including a core layer of the optical waveguide; determining groove parameters of a connecting groove to be processed in the processing area; the groove parameters include groove shape; and processing the processing area according to the determined groove parameters of the connecting groove to form a corresponding connecting groove.
In an embodiment of the present invention, the processing the corresponding connection groove in the processing region according to the determined groove parameter of the connection groove includes: the laser beam is firstly incident to a quartz lens, a light spot with the shape matched with the shape of the groove of the connecting groove is obtained through the quartz lens, an etching light spot with the shape consistent with the shape of the groove of the connecting groove is obtained through a diaphragm, and the corresponding connecting groove is formed in the processing area through etching of the etching light spot.
In one embodiment of the present invention, after forming the coupling groove on the optical waveguide plate and before inserting the optical fiber coupling end into the coupling groove, the method further includes: the bottom surface of the formed connecting groove is subjected to a sweeping process by a laser beam.
In one embodiment of the present invention, said embedding the optical fiber connection end into the connection groove to butt the core layer of the optical fiber to the core layer of the optical waveguide includes: and immediately embedding the optical fiber connecting end into the connecting groove after the connecting groove is processed and formed on the optical waveguide plate so as to enable the core layer of the optical fiber to be butted with the core layer of the optical waveguide.
In an embodiment of the present invention, after embedding the optical fiber connection end into the connection groove to make the core layer of the optical fiber butt-joint with the core layer of the optical waveguide, the method further includes: and dripping core layer glue into a butt joint gap between the core layer of the optical waveguide and the core layer of the optical fiber, and performing thermosetting.
In an embodiment of the present invention, dropping a core glue into the gap between the optical waveguide and the optical fiber, and after performing thermal curing, the method further includes: and dripping cladding glue to cover the connecting groove, and performing thermosetting.
To solve the above problems, the present invention also provides an optical waveguide plate comprising:
the optical waveguide plate is provided with a connecting groove, the bottom of the connecting groove comprises a core layer of the optical waveguide plate, and the connecting groove is used for accommodating the optical fiber connecting end.
To solve the above problems, the present invention further provides a communication transmission system including an optical waveguide plate and an optical fiber:
the optical waveguide plate is provided with a connecting groove, and the bottom of the groove comprises a core layer of the optical waveguide;
the connecting groove accommodates the optical fiber connecting end, and a core layer of the optical fiber is butted with a core layer of the optical waveguide.
In an embodiment of the present invention, the method further comprises: and a solidified core glue is arranged in a butt joint gap between the core layer of the optical waveguide and the core layer of the optical fiber and used for tightly connecting the core layer of the optical waveguide and the core layer of the optical fiber.
In an embodiment of the present invention, the method further comprises: and the groove cavity also comprises solidified cladding glue which is used for fixing the optical fiber and the optical waveguide.
The invention has the beneficial effects that:
according to the optical waveguide plate and optical fiber coupling connection method, the optical waveguide plate and the communication transmission system, the connection groove is formed in the optical waveguide plate in a processing mode, the bottom of the groove comprises the core layer of the optical waveguide, and the optical fiber connection end is embedded into the connection groove to enable the core layer of the optical fiber to be in butt joint with the core layer of the optical waveguide. Compared with the prior art, the butt joint of the core layer of optic fibre and the core layer of optical waveguide is carried out to the recess that inserts optical waveguide board core layer both sides through the guide pin, but processing forms connecting groove on the optical waveguide board, the optical fiber link is directly acceptd to this recess, let the core layer of optic fibre and the direct butt joint of the core layer of optical waveguide board, alignment that can be accurate is connected, be difficult to receive vibrations, the influence of environmental external force such as collision, can improve the core layer of optic fibre and the alignment precision of optical waveguide board core layer, and then transmission stability when carrying out communication transmission improves. And, need not to take the optical fiber link to have the guide pin, can make the processing of optical fiber link simple, reduce cost improves the core competitiveness of product.
Drawings
Fig. 1 is a schematic flow chart illustrating a coupling method of an optical waveguide plate and an optical fiber according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a coupling connection method between an optical waveguide plate and an optical fiber according to a second embodiment of the present invention;
fig. 3 is a schematic flow chart of a coupling connection method between an optical waveguide plate and an optical fiber according to a third embodiment of the present invention;
FIG. 3-1 is a schematic diagram of a prepared PCB including an optical waveguide transmission layer according to a third embodiment of the present invention;
FIG. 3-2 is a schematic diagram of an excimer laser processing a square groove on an end face of an optical waveguide according to a third embodiment of the present invention;
3-3 are schematic diagrams of laser beam transformation devices provided by a third embodiment of the present invention;
3-4 are schematic diagrams of further processing of the processed square groove provided by the third embodiment of the invention;
FIGS. 3-5 are schematic diagrams illustrating the operation of a third embodiment of the present invention for accurately aligning optical fibers of an optical waveguide plate using a 6-dimensional alignment jig;
3-6 are schematic diagrams of core layer glue dropping on the gap of the fiber end face of the precisely aligned optical waveguide plate according to the third embodiment of the present invention;
3-7 are schematic diagrams of curing and packaging by dropping a coating adhesive into the square groove by using a capillary tube according to a third embodiment of the present invention;
FIGS. 3-8 are schematic illustrations of the structure of a coupling groove provided in a third embodiment of the present invention in an in-plane region of an optical waveguide plate;
FIGS. 3-9 are schematic illustrations of connectorized grooves in the in-plate regions of an optical waveguide plate according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of an optical waveguide plate according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a communication transmission system according to a third embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
The method for coupling and connecting an optical waveguide plate and an optical fiber according to the present embodiment, as shown in fig. 1, includes the following steps:
step S101: processing and forming a connecting groove on the optical waveguide plate, wherein the bottom of the groove comprises a core layer of an optical waveguide;
in this step, the optical waveguide plate refers to a printed circuit board that also includes an optical waveguide transmission layer, and it should be understood that various existing circuit boards that include an optical waveguide transmission layer are included. The optical fiber is processed on the existing optical waveguide plate, namely, a connecting groove is processed and formed on the core layer and the periphery of the core layer of the optical waveguide plate, the bottom of the connecting groove comprises the core layer of the optical waveguide, and the core layer of the optical fiber is convenient to butt joint with the core layer of the optical waveguide when the optical fiber is embedded into the connecting groove. Further, in order to facilitate the accuracy of the butt joint of the core layer of the optical fiber and the core layer of the optical waveguide, preferably, the connection groove is larger than the connection end of the optical fiber, so that the accuracy of the butt joint can be adjusted conveniently.
Step S102: and embedding the optical fiber connecting end into the connecting groove to enable the core layer of the optical fiber to be in butt joint with the core layer of the optical waveguide.
In this step, since the bottom of the connection groove includes the core layer of the optical waveguide, when the optical fiber is inserted, the connection end of the optical fiber should be butted against the bottom of the connection groove, and further, the core layer of the optical fiber may be butted against the core layer of the optical waveguide. In order to better butt joint of the core layer of the optical fiber and the core layer of the optical waveguide, the connecting part of the optical fiber can be further adjusted, so that the butt joint of the core layer of the optical fiber and the core layer of the optical waveguide is accurate. Because not fixed through guide pin both ends, directly imbed the connector embedding connecting groove with the connector of optic fibre, the flexibility is strong like this, and the adjustment of being convenient for makes the sandwich layer of optic fibre and the sandwich layer butt joint precision of optical waveguide high.
Specifically, in step S101, the processing of the connecting groove on the optical waveguide plate may be to determine a processing region on the optical waveguide plate, where the processing region includes a core layer of the optical waveguide; determining groove parameters of a connecting groove to be processed in a processing area; the groove parameters include groove shape; and processing the corresponding connecting groove in the processing area according to the determined groove parameter of the connecting groove. It is noted that the groove parameters are related to how the connecting grooves are specifically formed. Such as the shape of the groove, which is particularly shaped to receive the connecting end of the optical fiber, it is preferable that the groove is formed to be slightly larger in conformity with the connecting end of the optical fiber. Of course, the groove parameters may also include the thickness of the particular groove, etc.
Specifically, in order to obtain the desired connecting groove, a laser beam may be firstly incident on the quartz lens to obtain a light spot with a shape matched with the shape of the groove of the connecting groove through the quartz lens, then an etching light spot with a shape consistent with the shape of the groove of the connecting groove is obtained through the diaphragm, and the corresponding connecting groove is formed in the processing region through etching of the etching light spot. It should be noted that the method of obtaining the etching light spot in conformity with the groove shape of the connecting groove is merely an embodiment, and it should be understood that the existing method of obtaining the etching light spot in conformity with the groove shape of the connecting groove is included in the present invention.
In the process of connecting the optical waveguide plate and the optical fiber, the smoothness of the butt-joint end face has a great influence on the coupling loss after the back-joint, and in order to further reduce the coupling loss after the back-joint, after the connecting groove is formed on the optical waveguide plate, before the optical fiber connecting end is embedded into the connecting groove, the method further comprises the following steps: the bottom surface of the formed connecting groove is subjected to a sweeping process by a laser beam. After the treatment, the smoothness of the bottom surface of the connecting groove can be improved, namely the smoothness of the core layer surface at the bottom of the connecting groove can be improved, and the coupling loss after butt joint is reduced. It should be noted that the method by the sweep etching process is merely an example, and it should be understood that any method capable of smoothing the end surface of the core layer connecting the bottom surfaces of the grooves is included in the present invention.
If the connector is in other words the terminal surface of the core layer of the connecting groove and the terminal surface of the optical fiber are exposed in the air, the optical fiber and the optical waveguide terminal surface are easily polluted by dust in the air after a long time, the scattering loss is further aggravated, the stable operation of the optical interconnection backboard transmission system is finally influenced, then in order to avoid the situation, preferably, the optical fiber connecting end is embedded into the connecting groove to enable the core layer of the optical fiber and the core layer of the optical waveguide to be in butt joint, and the optical fiber connecting end: after the optical waveguide plate is processed to form the connecting groove, the optical fiber connecting end is inserted into the connecting groove to butt the core layer of the optical fiber and the core layer of the optical waveguide. It should be noted that the connection method immediately after the formation of the connection groove is merely an example, and it should be understood that any method capable of preventing the core layer end surface of the groove bottom surface and the end surface of the optical fiber connection end from being contaminated by external factors such as air is included in the present invention.
Because the butt joint tightness of the core layer of the optical fiber and the core layer of the optical waveguide has great influence on the coupling loss, in order to improve the butt joint tightness of the core layer of the optical fiber and the core layer of the optical waveguide, after the connecting end of the optical fiber is embedded into the connecting groove to enable the core layer of the optical fiber and the core layer of the optical waveguide to be in butt joint, core layer glue is dripped into a butt joint gap between the core layer of the optical waveguide and the core layer of the optical fiber to carry out. Therefore, the butt joint of the core layer of the optical fiber and the core layer of the optical waveguide can be improved, the coupling loss is further reduced, and the stability of the transmission in the rear can be improved. It should be noted that the method of dropping the core glue is only one specific example, and it should be understood that any method that can improve the butt-joint tightness between the core layer of the optical fiber and the core layer of the optical waveguide is included in the present invention.
Further, in order to avoid receiving the influence of environment external forces such as vibrations, collisions after the accurate butt joint, probably cause the optical waveguide to aim at the deviation with the sandwich layer of optic fibre to and avoid adopting the drawback of other colloid encapsulation connecting grooves to cause chemical reaction (encapsulation glue glues with the covering, the sandwich layer is glued and probably takes place chemical reaction), glue in dropwise add sandwich layer to optical waveguide and optic fibre clearance, still include after carrying out the thermosetting: and (5) dripping cladding glue to cover the connecting groove, and performing thermocuring. It should be noted that the method of dropping the envelope adhesive is merely an embodiment, and it should be understood that any method that can achieve the above effects is included in the present invention.
Example two
The method for coupling and connecting an optical waveguide plate and an optical fiber according to this embodiment, as shown in fig. 2 in detail, includes the following steps:
step S201: preparing a printed circuit board containing an optical waveguide transmission layer, namely an optical waveguide board;
in this step, the prepared optical waveguide plate in this step has core layer dimensions of 50 μm × 50 μm and upper and lower cladding thicknesses of 50 μm, or the core layer, upper and lower cladding dimensions of the optical waveguide are not limited to the above dimensions.
Step S202: writing a rectangular groove on the end face of the prepared optical waveguide plate by using a laser;
in the step, parameters such as exposure energy, dotting frequency, stepping speed and the like can be specifically set on working software of the laser, and then laser etching is carried out; it should be understood that the laser energy, the spot processing time, and the stepping speed must be determined in advance when the laser is used for writing. It should be noted that the rectangular groove is a kind of the connection groove, and the shape and configuration of the connection groove are determined according to specific situations.
Step S203: further processing is carried out on the well-machined rectangular groove;
in this step, treatment is carried out mainly to reduce the roughness of the end face of the optical waveguide plate. Annealing can be adopted for treatment, but the annealing temperature and the annealing time are accurately determined; the heat effect of CO2 laser can be used for processing, and the specific method is to accurately control CO2 laser to carry out back-etching on the groove, so that the roughness of the groove is reduced; and so on.
Step S204: accurately adjusting the 6-dimensional adjusting frame to enable the optical fiber to be embedded into the rectangular groove and to enable the optical fiber and the optical waveguide to be accurately aligned;
in this step, when the 6-dimensional adjusting frame is adjusted to align and connect the optical waveguide-board and the optical fiber, the transmission system (composed of the light source, the optical backplane sample, the power meter and the connecting optical fiber) is used to display the loop loss of the optical waveguide-board and the optical fiber for real-time connection, and when the loop loss reaches the minimum value, the connection alignment between the optical waveguide board and the optical fiber is optimal.
Step S205: under a microscope, dripping core layer glue into a gap between the optical waveguide plate and the optical fiber by using a capillary tube, and performing thermocuring to achieve good close contact;
step S206: and (3) dripping a coating adhesive by using a capillary tube to cover the whole rectangular groove, and performing thermocuring to finish the whole process of curing and packaging the connector.
It should be noted that in steps S205 and S206, a microscope is needed to precisely control the flow rate and the dispensing position thereof when the core layer glue and the cladding layer glue are dispensed.
Compared with the prior parallel coupling technology, the invention has the following advantages and characteristics: according to the method, the connector is simple and easy to manufacture, the manufacturing efficiency is high, and batch production can be realized; the micromachining technology is skillfully applied to the parallel coupling technology of the optical waveguide plate and the optical fiber, so that the alignment deviation of optical waveguide-optical fiber connection caused by external environmental forces such as vibration, collision and the like is overcome, the adverse factor that the end face of the connector is easily polluted by dust when exposed in the air for a long time is avoided, and the long-time stable and reliable operation of the optical interconnection transmission system is finally realized; the coating adhesive is used for packaging and curing the connector, so that the defect of chemical reaction possibly caused by packaging and curing by other colloids is avoided, the connector is further protected, and the connector is packaged by other colloids, so that the groove mark can be obviously seen under a microscope due to different physical and chemical properties of materials, and the packaging and curing process has no obvious groove mark; the preparation method is simple and easy to implement, has high efficiency, and reduces the production cost on the whole.
It should be noted that the method of this embodiment can be applied not only to the parallel coupling of the optical fiber and the optical waveguide plate, but also to the perpendicular coupling of the optical fiber and the optical waveguide plate. For example, the optical fiber is vertically inserted into the groove, but the end face of the optical fiber is processed into a 45-degree inclined plane, and the inclined plane is plated with a high-reflection film, when the optical fiber is vertically coupled with the optical waveguide, the inclined plane faces the outer direction of the end face of the optical waveguide, and the signal light can be vertically reflected by the inclined plane and enter the optical waveguide for transmission; or, preparing a grating coupler in an area where the optical waveguide needs to be vertical, writing a groove on an upper cladding layer right above the grating coupler, wherein the thickness of the groove cannot exceed the thickness of the upper cladding layer, vertically inserting the optical fiber into the groove for curing, and vertically coupling signal light transmitted by the optical fiber into the optical waveguide for transmission through the grating coupler.
EXAMPLE III
The optical waveguide plate and optical fiber coupling connection method of the embodiment mainly utilizes a laser to etch a rectangular groove on the end face of the prepared optical waveguide, the rectangular groove is one of the connection grooves, the specific shape can be determined according to specific conditions, then the optical fiber is embedded into the rectangular groove to realize butt coupling, and finally, the waveguide glue is used for curing and packaging, so that the parallel coupling of the optical waveguide and the optical fiber is realized. The method skillfully applies the micro-processing technology to the parallel coupling technology of the optical waveguide plate and the optical fiber, overcomes the alignment deviation of optical waveguide-optical fiber connection caused by external environmental forces such as vibration, collision and the like, avoids the bad factors that the end face of the connector is easy to be polluted by dust when exposed in the air for a long time, and finally realizes the long-time stable and reliable operation of the optical interconnection transmission system.
The method in this embodiment, taking a certain optical waveguide material as an example, the characteristic dimension of the optical waveguide is 5050 μmx50 μm, and the wavelength of the transmitted light is 850nm, and the method in this embodiment is specifically shown in fig. 3, and includes the following steps:
step S301: referring to fig. 3-1, the prepared printed circuit board including the optical waveguide transmission layer, i.e., the optical waveguide plate, has an upper cladding layer 1 and a lower cladding layer 3 having a thickness of 50 μm, and a core layer 2 having a rectangular shape and having a size of 50 μmx50 μm;
step S302: referring to fig. 3-2, a laser beam 4 emitted by a CO2 laser passes through a conversion device to obtain a light spot with an expected shape, firstly, the CO2 laser beam is incident on a quartz lens 5, the light spot with the size matched with the size of an etched rectangular groove is obtained through the quartz lens, and then a rectangular light spot 7 with the size consistent with the size of the rectangular groove is obtained through a diaphragm 6;
step S303: referring to fig. 3-3, the laser etches a rectangular groove 8 on the end face of the optical waveguide, and the size of a light spot required for etching the rectangular groove can be obtained by setting parameters such as energy, frequency, stepping speed and the like of laser working software;
step S304: referring to fig. 3-4, the machined rectangular groove is further processed by retracing the end face 8 of the rectangular groove multiple times with the laser beam 9.
Step S305: referring to fig. 3-5, the 6-dimensional alignment jig 11 is precisely adjusted to fit the optical fiber 10 into the rectangular groove and to precisely align the optical fiber with the core layer of the optical waveguide.
Step S306: referring to fig. 3-6, under a microscope, a core layer glue 13 is dropped into the gap between the optical waveguide plate and the optical fiber by using a capillary tube 12, and then heat curing is performed to achieve good adhesion between the optical waveguide plate and the optical fiber. The microscope can control the accuracy of the working point, and the capillary tube can accurately control the using amount of the core layer glue to achieve a good dense effect.
Step S307: referring to fig. 3-7, under a microscope, a capillary tube 12 is used to drop a coating adhesive 14 to cover the whole rectangular groove, and then the whole process of curing and packaging the connector is completed by performing heat curing.
And at this moment, the process of the technological method for realizing parallel coupling by embedding the optical fiber into the groove on the end face of the optical waveguide is finished.
In this embodiment, the thicknesses of the lower cladding layer, the core layer, and the upper cladding layer are determined by the optical waveguide material used and the wavelength of light to be transmitted.
In this embodiment, the printed circuit board with the optical waveguide transmission layer can be manufactured by using the prior art, such as doctor blade method, hot embossing method, and the like.
Still further, the invention can also be applied in other applications, for example, in the case of a printed circuit board with an optical waveguide transmission layer, where the grooves of the optical waveguide are not placed on the end face, but in the area inside the board, see fig. 3-8, the upper cladding layer 1 and the lower cladding layer 3 have a thickness of 50 μm, and the core layer 2 has a rectangular shape with dimensions of 50 μm x50 μm. The groove 4 is made by a CO2 laser, the size of the groove is matched with that of the optical fiber 10, and the groove 4 is subjected to laser ablation treatment. And (3) accurately adjusting a 6-dimensional adjusting frame 11 to enable the optical fiber 10 to be embedded into the rectangular groove, accurately aligning the optical fiber with a core layer of the optical waveguide, dripping core layer glue 13 into the gap between the optical waveguide and the optical fiber by using a capillary tube 12 under a microscope, and performing thermocuring to enable the optical waveguide and the optical fiber to be in good tight joint. Referring to fig. 3-9, under a microscope, a capillary tube 12 is used to drop cladding glue 14 to cover the whole rectangular groove, and then the whole process of connector curing and packaging is completed through heat curing, and the optical fiber on the appearance of the product comes out from the plate in a flying tail form.
It should be noted that, in this embodiment, one optical fiber is taken as an example, and a plurality of optical fibers may be coupled to the optical waveguide to form a multi-channel optical path connection. To improve the positioning accuracy, the design of the positioning pin can be increased, for example, two positioning pin holes are added at two ends of a row of optical waveguides, but this depends on the specification of the mating optical fiber. The optical waveguide plate and optical fiber coupling connection method in the embodiment is adopted, the method idea is to skillfully combine the micromachining technology and the connector preparation, and the method is characterized in that the laser is used for carrying out digital processing, so that the method is simple, easy, efficient and reliable, can be produced in batches, and reduces the production cost on the whole. The method for dripping the core layer glue and the cladding glue by using the capillary tube is characterized by simple preparation process and higher efficiency, and only needs to accurately control the alignment degree of the capillary tube and the square groove and the glue consumption under a microscope. The gap between the well-adjusted optical waveguide plate and the optical fiber connector is tightly connected by core layer glue, so that the scattering loss can be reduced; whole connector glues solidification encapsulation with the covering, the biggest advantage is firmly reliable, overcome the alignment deviation that produces because of environmental external forces such as vibrations, collision, also avoided air dust to pollute the influence of connector terminal surface adverse factor, and make the long-time reliable operation of transmission system, simultaneously, the use that the covering is glued also can avoid adopting the drawback of other colloid encapsulation rectangular channels cause chemical reaction (encapsulation is glued with the covering, the core layer is glued and probably takes place chemical reaction), further protected the connector. With other colloid encapsulations, the groove imprint can be clearly seen under a microscope due to the different physicochemical properties of the materials, whereas the encapsulation described herein has no apparent groove imprint when cured.
Example four
The present embodiment provides an optical waveguide plate 400, as shown in fig. 4, comprising: the optical waveguide plate is provided with a connecting groove 401, the bottom of the connecting groove contains the core layer of the optical waveguide plate, and the connecting groove is used for accommodating the optical fiber connecting end.
The present embodiment also provides a communication transmission system, as shown in fig. 5, including an optical waveguide plate 400 and an optical fiber 500: the optical waveguide plate is provided with a connecting groove, and the bottom of the groove comprises a core layer of the optical waveguide; the connecting groove accommodates the optical fiber connecting end, and a core layer of the optical fiber is butted with a core layer of the optical waveguide. Further, still include: and a solidified core glue is arranged in a butt joint gap between the core layer of the optical waveguide and the core layer of the optical fiber and used for tightly connecting the core layer of the optical waveguide and the core layer of the optical fiber. Further still include: and the groove cavity also comprises solidified cladding glue which is used for fixing the optical fiber and the optical waveguide.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (5)
1. A method for coupling an optical waveguide plate to an optical fiber, comprising:
processing and forming a connecting groove on an optical waveguide plate, wherein the bottom of the groove comprises a core layer of the optical waveguide;
embedding the optical fiber connecting end into the connecting groove to enable the core layer of the optical fiber to be in butt joint with the core layer of the optical waveguide;
after the optical fiber connection end is embedded into the connection groove to make the core layer of the optical fiber and the core layer of the optical waveguide butt joint, the optical waveguide connection device further comprises: dripping core layer glue into a butt joint gap between the core layer of the optical waveguide and the core layer of the optical fiber, and performing thermal curing;
dripping core layer glue into the gap between the optical waveguide and the optical fiber, and performing thermal curing to further comprise: and dripping cladding glue to cover the connecting groove, and performing thermosetting.
2. The method for coupling and splicing an optical waveguide plate and optical fibers according to claim 1, wherein said forming a splicing groove in the optical waveguide plate comprises: defining a processing region on an optical waveguide plate, the processing region including a core layer of the optical waveguide; determining groove parameters of a connecting groove to be processed in the processing area; the groove parameters include groove shape; and processing the processing area according to the determined groove parameters of the connecting groove to form a corresponding connecting groove.
3. The method for coupling and splicing an optical waveguide plate and an optical fiber according to claim 2, wherein said processing a corresponding splicing groove in said processing region according to the determined groove parameter of the splicing groove comprises: the laser beam is firstly incident to a quartz lens, a light spot with the shape matched with the shape of the groove of the connecting groove is obtained through the quartz lens, an etching light spot with the shape consistent with the shape of the groove of the connecting groove is obtained through a diaphragm, and the corresponding connecting groove is formed in the processing area through etching of the etching light spot.
4. The method for coupling and splicing an optical waveguide plate and optical fibers according to claim 3, wherein after the coupling grooves are formed in the optical waveguide plate and before the optical fiber coupling ends are inserted into the coupling grooves, the method further comprises: the bottom surface of the formed connecting groove is subjected to a sweeping process by a laser beam.
5. The method for coupling an optical waveguide plate to optical fibers according to any one of claims 1 to 4, wherein the inserting the optical fiber connection end into the connection groove so that the core layer of the optical fiber is butted against the core layer of the optical waveguide comprises: and immediately embedding the optical fiber connecting end into the connecting groove after the connecting groove is processed and formed on the optical waveguide plate so as to enable the core layer of the optical fiber to be butted with the core layer of the optical waveguide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510233217.1A CN106199832B (en) | 2015-05-08 | 2015-05-08 | Optical waveguide plate and optical fiber coupling connection method, optical waveguide plate and communication transmission system |
| PCT/CN2016/074707 WO2016180071A1 (en) | 2015-05-08 | 2016-02-26 | Coupled connecting method for optical wave guide plate and optical fibers， optical wave guide plate and telecommunication transmission system |
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| CN201510233217.1A CN106199832B (en) | 2015-05-08 | 2015-05-08 | Optical waveguide plate and optical fiber coupling connection method, optical waveguide plate and communication transmission system |
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| CN106950652A (en) * | 2016-01-06 | 2017-07-14 | 中兴通讯股份有限公司 | Optical waveguide assembly |
| CN107942451A (en) * | 2017-12-14 | 2018-04-20 | 武汉电信器件有限公司 | A kind of coupling process and coupled structure of silicon optical chip |
| CN108303767B (en) * | 2018-02-09 | 2019-12-31 | 苏州德睿电力科技有限公司 | Method for preparing concave mirror on optical waveguide |
| CN109100833B (en) * | 2018-06-06 | 2021-01-15 | 苏州席正通信科技有限公司 | Parallel coupling photoelectric integrated circuit board connector and manufacturing method thereof |
| CN111367017B (en) * | 2020-03-20 | 2022-05-20 | 中航光电科技股份有限公司 | Waveguide-optical fiber vertical coupling structure on board |
| CN111580203A (en) * | 2020-04-07 | 2020-08-25 | 江苏大学 | Device and method for preparing rectangular-structure grating by ultrafast laser direct writing |
| CN112327420B (en) * | 2020-11-03 | 2022-06-28 | 中航光电科技股份有限公司 | Waveguide through optical fiber alignment coupling transmission structure and production process |
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| JP2791401B2 (en) * | 1988-09-16 | 1998-08-27 | 日本電信電話株式会社 | Optical waveguide with optical fiber fixing groove and method for connecting optical waveguide and optical fiber |
| JP3631622B2 (en) * | 1998-09-29 | 2005-03-23 | 京セラ株式会社 | Connection structure and connection method between optical waveguide and optical fiber |
| JP2000131556A (en) * | 1998-10-28 | 2000-05-12 | Kyocera Corp | Connecting structure of optical waveguide and optical fiber and connection method therefor |
| GB2356463B (en) * | 1999-11-16 | 2003-06-25 | Marconi Electronic Syst Ltd | Method of alignment in an optoelectronic assembly |
| CN1274452C (en) * | 2002-11-27 | 2006-09-13 | 中国印钞造币总公司 | Laser micro-carving method |
| JP2007178852A (en) * | 2005-12-28 | 2007-07-12 | Hitachi Cable Ltd | Optical wiring board and optical module using the same |
| CN104040390A (en) * | 2012-01-10 | 2014-09-10 | 日立化成株式会社 | Optical waveguide with mirror, optical fiber connector, and manufacturing method thereof |
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| CN106199832A (en) | 2016-12-07 |
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