JP2006010891A - Optical coupler and its mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical coupler which can be optically coupled to an optical element mounted to exit light or to make the light incident on a direction intersecting with a mounting substrate surface, permits compact directional change of the propagation direction of the light in a direction parallel with the mounting substrate and can perform input and output of the light to and from the outside through an optical fiber and can be easily manufactured at a low cost, and can assume the form of a coupling state of an optical connector type which can be changed in an optical element to be connected and its mounting structure. <P>SOLUTION: The optical coupler 10 is formed by optically connecting an optical waveguide 3 provided with an end surface 9 inclined 45° with a first end 8 as a light reflection surface and the optical fiber 1. A surface type light emitting/light receiving element 30 , such as a VCSEL, is fixed to the mounting substrate 20 and both sides thereof are provided with projections 21. The projections 21 are concavely and onvexly fitted to through holes 12 disposed in the optical waveguide 3 and the optical coupler 30 is positioned and fixed to the mounting substrate 20. The inclined end surface 9 is arranged in a position opposite to the light emitting or light receiving section 31 of the optical element 30 and the optical element 30 and the optical which 3 are optically coupled via the light reflection by the inclined end surface 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the optical wiring system, the present invention connects an optical path between a light emitting element or a light receiving element mounted on a mounting substrate and an optical fiber, and outputs light emitted from the light emitting element to the outside through the optical fiber. The present invention relates to an optical coupling device that transmits light input from the outside through an optical fiber to a light receiving element and a mounting structure thereof.

  Until now, information transmission over a relatively short distance, such as between boards in electronic equipment or between chips in a board, has been performed mainly by electrical signals, but in order to further improve the performance of integrated circuits. Therefore, it is necessary to increase the signal speed and the signal wiring density. However, in the electric signal wiring, it is difficult to increase the speed of the electric signal and increase the density of the electric signal wiring due to problems such as signal delay due to the time constant of the wiring and generation of noise.

  Optical wiring (optical interconnection) that solves these problems is drawing attention. Optical wiring can be applied to various locations such as between electronic devices, between boards in electronic devices, or between chips in a board. For example, chips are mounted for short-distance signal transmission between chips. An optical waveguide can be formed on a substrate, and an optical transmission / communication system can be constructed using the optical waveguide as a transmission path for signal-modulated laser light or the like.

  On the other hand, an optical fiber is suitable for transmitting a signal over a relatively long distance. Therefore, in an optical wiring system, an optical path is connected between a light emitting element or a light receiving element mounted on a mounting substrate and an optical fiber, and light emitted from the light emitting element is output to the outside through the optical fiber, or an optical fiber. An optical coupling device that transmits light input from the outside to the light receiving element is required.

  At this time, surface-type light-emitting or light-receiving elements in which a light-emitting part or light-receiving part is provided on the upper surface of the element are widespread, and many types are supplied at low cost. Therefore, it is desirable that the above-described optical coupling device has a structure that can be compactly optically coupled to a surface light emitting or receiving element mounted on a mounting substrate. In addition, it is necessary to maintain good connection accuracy so that the connection loss of input and output light is within the allowable range, and it is necessary to have a light-emitting or light-receiving element that is attached and detachable to the mounting board. It is more desirable to have an optical connector type coupling configuration that can be changed accordingly. Hereinafter, in the present specification, when the light emitting element and the light receiving element are not distinguished, they may be referred to as optical elements.

  Conventionally, as an optical coupling device having an optical connector type coupling configuration, for example, in Japanese Patent No. 3301791, a ferrule is attached to an optical fiber on a plug side and is fitted with a sleeve on a receptacle side on which a photoelectric element such as a light emitting diode is mounted. An example of optically coupling an optical fiber and a photoelectric element is shown. However, this structure has limited applications because the photoelectric element is not mounted on the mounting substrate.

  As an optical coupling device that optically couples a surface type optical element mounted on a mounting substrate and an optical fiber, for example, in Patent Document 1 described later, a surface type light emitting / receiving element is oriented sideways with respect to the substrate surface (incident light). Also, an example of an optical connector that is mounted in a direction in which the direction of outgoing light is parallel to the substrate surface and an optical fiber is disposed opposite to the light receiving or light emitting portion is shown.

  FIG. 8 is a cross-sectional view (a) in a connected state and a cross-sectional view (b) in a state before connection of the optical connector 100 disclosed in Patent Document 1. In addition, the same figure (a) is expanded a little from the same figure (b). In the optical connector 100, on the plug 101 side, the ferrule 102 is attached to the optical fiber 103, and on the receiver 104 side, the surface type light emitting / receiving element 106 is electrically connected to this element. A printed wiring board) 107 is mounted on a receptacle 105, and the receptacle 105 is mounted on the board 108 in a horizontal direction. Similar to the optical connector disclosed in Japanese Patent No. 3301791, the optical coupling between the light emitting / receiving element 106 and the optical fiber 103 is performed by fitting the ferrule 102 and the receptacle 105 together.

  The above structure has a problem that the cost increases because the receiver 104 having a special structure is used for mounting an optical element. In addition, since the plug 101 is inserted and removed in a direction parallel to the surface of the substrate 108, a space for this attachment and detachment is required on the substrate 108, and the mounting density is reduced or the device is highly integrated. There is a problem that it cannot be used on a densely arranged substrate.

  In the above example, the surface type light emitting / receiving element 106 is mounted horizontally using the receiver 104 for the following reason. That is, when a planar optical element is directly fixed on a substrate, the direction of light incident on the optical element or emitted from the optical element is substantially perpendicular to the substrate surface. If an optical coupling device such as an optical connector is arranged in this direction, useless space that cannot be used for mounting other elements, for example, it becomes impossible to juxtapose another board in this space, and the mounting density decreases. As a result, the apparatus becomes larger.

  Therefore, in order to directly fix the surface-type optical element on the substrate and not reduce the mounting density, the direction of incident light or outgoing light of the optical element is approximately 90 degrees in a direction substantially parallel to the substrate surface. Need to change.

  As such an optical coupling device for direction change, for example, Patent Document 2 described later discloses an optomechanical connector using an optical fiber.

  FIG. 9 is a perspective view of the optomechanical connector 120 disclosed in Patent Document 2. As shown in FIG. In the optomechanical connector 120, the optical fiber 121 is inserted into a groove having a V-shaped cross section formed in the fixture 123 at one end, aligned with contact with the inclined side surface, and pressed by the lid 124. And fixed. On the left and right sides, two guide pins 122 are inserted into a groove having an inverted trapezoidal cross section formed on the fixture 123, like the optical fiber 121, and aligned by contact with the inclined side surface. Pressed and fixed. These aggregates are held by a plastic capsule 125. The optical fiber 121 is held at a desired angle, for example, 90 degrees, in the plastic capsule 125, and the other end is fixed together with the two guide pins 126 in the same manner as the above end. 127 and the lid 128 are positioned and held.

  In order to use the optomechanical connector 120 described above, for example, a guide hole that fits the guide pin 122 is provided in a mounting board on which the optical element is fixed, and the optomechanical connector is fitted by the fitting of the guide hole and the guide pin 122. The position 120 is fixed to the mounting substrate, and optical coupling between the optical element and the optical fiber is formed. Then, while propagating through the optical fiber 121, the direction of the incoming and outgoing light of the optical element is changed by a desired angle.

  However, the method of changing the direction of the optical path by drawing the optical fiber as in the opto-mechanical connector 120 described above causes the loss of propagating light to increase if the bending radius of curvature of the optical fiber is too small. The size of the optical fiber required for this increases. For this reason, when an optical path changing device using an optical fiber is mounted on a substrate, the large optical path changing device protrudes from the substrate, and other devices cannot be juxtaposed in this space. There is a problem that wasteful space that cannot be used is generated, the mounting density is reduced, or the device cannot be used in an apparatus in which a number of substrates are stacked in parallel.

  In addition, in an apparatus using only an optical fiber, it is difficult to incorporate an optical circuit. For example, in order to perform optical multiplexing / demultiplexing, a fiber coupler or a fiber coupling by fusion is required, and it is difficult to fit two branches into a small connector portion. It becomes even more difficult if there are more than 3 branches. Furthermore, a complicated circuit such as a wavelength multiplexer / demultiplexer that uses optical interference cannot be configured with an optical fiber, or even if it can, it is significantly enlarged, so that it is practically impossible to incorporate it. .

  On the other hand, for example, Patent Document 3 to be described later shows an example in which an inclined end surface is formed at an end portion of an optical waveguide, and the direction of the optical path is changed by using the inclined end surface as a light reflecting surface.

  FIG. 10 is a cross-sectional view of the optical module 140 disclosed in Patent Document 3. As shown in FIG. In the optical module 140, solder bumps 142 are formed on the substrate 141, and a VCSEL (vertical cavity surface emitting laser) 143, which is an example of a surface light emitting element, is fixed to the bumps with the light emitting unit 144 facing downward. ing. On the other hand, one end surface of the optical waveguide 145 is formed on an inclined end surface that functions as a 45-degree inclined mirror 147, and the 45-degree inclined mirror 147 is disposed at a position facing the light emitting unit 144. It is fixed on the top.

  During the operation of the optical module 140, the laser light emitted from the light emitting unit 144 of the VCSEL 143 enters the optical waveguide 145 from above, is reflected by the 45-degree inclined mirror 147, is guided into the optical waveguide core 146, and is optical connector 148. Then, it is transmitted to, for example, an optical fiber. In this way, the VCSEL 143, the optical waveguide core 146, and the optical fiber are optically coupled via the 45-degree tilt mirror 147, and the laser light emitted from the VCSEL 143 in a direction substantially orthogonal to the substrate surface is in the direction of approximately 90 degrees. It is converted and transmitted in a direction substantially parallel to the substrate surface.

  In this way, when the surface optical element mounted on the mounting substrate and the optical fiber are optically coupled through the optical waveguide having the inclined end surface, the direction of incident light or outgoing light is parallel to the substrate simultaneously with the optical coupling. Can be changed in any direction, and the substrates can be compactly stacked and juxtaposed to achieve high-density mounting. However, in the optical module 140, since the optical waveguide 145 is fixed on the substrate 141, other elements cannot be mounted in this region. Further, since the VCSEL 143 is aligned with the optical waveguide 145, the VCSEL 143 is placed on the substrate 141 in a special form so that the VCSEL 143 is positioned above the optical waveguide 145 in the height direction (a direction perpendicular to the substrate 141). Must be implemented. In addition, a special process is required for manufacturing the optical waveguide. Furthermore, it is not possible to adopt an optical connector type coupling configuration in which the optical elements to be connected can be changed as necessary.

JP 2003-195120 A (page 3-5, FIG. 1-3) JP 2000-509839 A (page 10-13, FIGS. 1-4 and 8) Japanese Patent Laying-Open No. 2003-215371 (8th and 9th pages, FIG. 1)

  As illustrated using Patent Document 1 and Patent Document 2, when a surface-type optical element mounted on a mounting substrate is directly optically coupled to an optical fiber, it is expensive to mount the optical element on a special holder. Therefore, when a large optical path conversion device is mounted on the mounting substrate, there is a problem that the mounting density is lowered.

  As shown in Patent Document 3, when the planar optical element and the optical fiber are optically coupled via an optical waveguide having an inclined end surface, the above problem is solved. When fixed on the substrate, other elements cannot be mounted in this region, and the optical element must be mounted by a special method as a result of positioning the optical element with respect to the optical waveguide. In addition, a special process is required for manufacturing the optical waveguide. Furthermore, it is not possible to adopt an optical connector type coupling configuration in which the optical elements to be connected can be changed as necessary.

  In view of the above circumstances, the object of the present invention can be optically coupled with an optical element mounted so that light is emitted or incident in a direction intersecting the mounting substrate surface, and the light propagation direction is parallel to the mounting substrate. It is possible to change the direction in a compact direction, input / output light from / to the outside through an optical fiber, and can be easily manufactured at low cost, and adopt an optical connector type coupling form that can change the optical elements to be connected. It is an object to provide an optical coupling device and a mounting structure thereof.

That is, the present invention provides an optical coupling device in which an optical waveguide and an optical fiber are optically coupled.
An inclined end surface for reflecting light into or out of the optical waveguide is formed at the first end of the optical waveguide,
And the optical waveguide and the optical fiber are optically coupled at the second end of the optical waveguide,
Attached to the mounting substrate in a state where the inclined end surface is opposed to a light emitting or receiving portion of a light emitting or receiving element fixed to the mounting substrate so that light is emitted or incident in a direction intersecting the mounting substrate surface. An optical coupling device characterized by being configured as follows:
An optical coupling device, a light emitting or light receiving element, and a mounting substrate on which the optical element is fixed;
In the optical coupling device,
An optical waveguide and an optical fiber are optically coupled,
An inclined end surface for reflecting light into or out of the optical waveguide is formed at the first end of the optical waveguide,
And the optical waveguide and the optical fiber are optically coupled at the second end of the optical waveguide,
Attached to the mounting substrate in a state where the inclined end surface is opposed to a light emitting or light receiving portion of a light emitting or receiving element fixed to the mounting substrate so that light is emitted or incident in a direction intersecting the mounting substrate surface. ing,
The present invention relates to a mounting structure of an optical coupling device.

  According to the present invention, in the optical coupling device, the optical waveguide and the optical fiber are optically coupled, and an inclined end surface for reflecting light into or out of the optical waveguide is formed at the first end of the optical waveguide. The optical waveguide is optically coupled to the optical fiber at the second end of the optical waveguide. And in the mounting form, the inclined end face is disposed opposite to the light emitting or light receiving portion of the light emitting or light receiving element fixed to the mounting board so that light is emitted or incident in a direction intersecting the mounting board surface. And attached to the mounting board. For this reason, the light emitted from the light emitting element or the light incident on the light receiving element is optically coupled to the optical coupling device through reflection by the inclined end surface, and at the same time, for example, in a direction substantially parallel to the mounting substrate. The direction is changed and exchanged with the outside through an optical fiber.

  At this time, since the light emitted from the light emitting element or the light incident on the light receiving element is redirected by reflection by the inclined end face, the length required for this is only the thickness of the optical waveguide layer. Therefore, it is possible to manufacture the optical coupling device that is extremely small compared to an optical direction changing device that changes the direction by bending the light guide using an optical fiber or the like. Therefore, the mounting board can be juxtaposed with another mounting board in close proximity. Further, since the optical waveguide is fixed in a position apart from the mounting substrate, this does not cause an area that cannot be used for mounting other elements on the mounting substrate. As a result, high-density mounting can be realized, and the mounting structure can be downsized.

  In addition, the direction change makes it possible to use a surface-type light-emitting or light-receiving element in which many types are supplied at low cost. At this time, the optical waveguide is not aligned with the optical waveguide as in Patent Document 3, but the optical waveguide is aligned with the planar light emitting or receiving element. It is not necessary to fix the element to the mounting substrate in a special form. The optical waveguide is manufactured by a normal process. As a result, the optical coupling device and the mounting structure of the present invention can be easily manufactured with high yield and low cost. Furthermore, if the light emitting or light receiving element for aligning the optical waveguide is changed as necessary, an optical connector type coupling form in which the optical element to be connected can be changed can be realized.

  In the present invention, it is preferable that the optical coupling device is attached to the mounting substrate so that the optical coupling device can be attached to and detached from the mounting substrate in a direction intersecting the surface direction. Accordingly, it is possible to form an optical coupling device having an optical connector type coupling configuration in which the light coupling or light receiving element to be connected to the optical coupling device can be changed as necessary. In addition, when mounting / dismounting, the mounting board is inserted / removed in a direction intersecting the mounting board, for example, in a direction perpendicular to the board, so that a mounting / demounting space is not required on the mounting board, and the mounting density is reduced or the elements are densely packed. Therefore, it cannot be used with a highly integrated mounting board.

  At this time, positioning means for the light emitting or light receiving element on the mounting board is preferably provided, and the positioning means may be, for example, uneven fitting means with the mounting board. More specifically, it is preferable to have a recess or a through hole that fits into a protrusion provided on the optical waveguide. Accordingly, the inclined end face of the optical coupling device can be quickly, accurately, and easily aligned with respect to the light emitting or light receiving element, and the light emitting or light receiving element and the optical coupling device can be aligned with each other. Can be combined. The positioning means may be any means as long as it can be fixed in position, but is preferably means that can be fixed in a detachable manner, specifically, a concave-convex fitting means such as a combination of a projection and a through-hole. Etc. are suitable.

  Further, the optical waveguide is composed of a joined body of a core and a clad, and the core that is a light guide path is a branched structure in which a single core portion is branched into a plurality of core portions, and / or a plurality of core portions is 1 It is preferable to have a multiplexing structure coupled to the core portion of the book. Such a branching structure and / or combining structure can be formed with an optical fiber, but can be reduced in size by forming with the optical waveguide. Further, an optical circuit having a more complicated function can be incorporated, and a highly functional optical coupling device can be realized. For example, optical fibers such as an optical circuit that has a Mach-Zehnder interferometer and performs wavelength multiplexing and demultiplexing, an optical circuit that has multiple directional couplers and Mach-Zehnder interferometers, and has a wavelength add / drop function It is possible to easily realize an optical circuit that is difficult to do.

  In addition, at least a part of the optical waveguide on the first end side may be a thin film optical waveguide having flexibility. At this time, it is preferable that the thin film optical waveguide is constituted only by a joined body of a core and a clad. Thereby, the inclined end face of the optical coupling device can be arranged in an arbitrary direction, and optical coupling can be formed with a desired element among the light emitting or light receiving elements fixed to the mounting substrate. Further, when the core is branched into a plurality of core portions on the first end portion side, a plurality of light emitting or light receiving elements may be optically coupled with the plurality of first end portions. Is possible. Thus, for example, it becomes possible to combine a plurality of the optical elements at positions separated on the mounting board with one optical coupling device, and the desired position without being restricted by the position on the mounting board. The optical element and the optical coupling device can be optically coupled.

  The optical waveguide is preferably made of resin. The joined body is preferably formed of a resin. By using an organic material-based resin as the material of the optical waveguide, the optical waveguide manufacturing process can be simplified as compared with the case of using a conventional silica-based optical waveguide. For example, when a UV (ultraviolet) curable organic material is used, film formation by spin coating or core processing by photolithography is possible, and CVD (Chemical Vapor Deposition: chemical vapor deposition method) like a quartz optical waveguide is possible. ) Or FHD (Flame Hydrolysis Deposition), etc., and core processing by RIE (Reactive Ion Etching) are not required, and the optical A waveguide can be manufactured.

  The light emitting or light receiving element is a planar light emitting or light receiving element, and the direction of the emitted light or incident light of the optical element is substantially perpendicular to the mounting substrate surface, and the optical waveguide at the first end portion It is preferable that the direction of light propagating in the interior is substantially parallel to the mounting substrate surface. This makes it possible to use optical elements such as surface-type light-emitting or light-receiving elements, which are supplied at a low cost by many varieties, and arrange the mounting substrates in close proximity to each other. High-density mounting can be realized, and the mounting structure can be downsized.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following examples.

Embodiment 1
FIG. 1 is a perspective view showing an optical coupling device and its mounting structure according to Embodiment 1 of the present invention. The mounting structure shown in FIG. 1 includes an optical coupling device 10, an optical element 30, a mounting substrate 20 to which the optical element 30 is fixed, and the optical coupling device 10 is fixed in position.

  The optical coupling device 10 is mainly formed by optically coupling the optical fiber 1 and the optical waveguide 3 at the second end portion 11 of the optical waveguide 3. The optical fiber 1 is aligned and fixed by the optical fiber block 2, the optical waveguide 3 is held by the strength holder 18, and the optical fiber 1 and the optical waveguide 3 are bonded and fixed so that their optical paths coincide with each other. Yes.

  The optical waveguide 3 is an embedded type light in which an optical waveguide layer 5 composed of a joined body of a core 6 and a clad 7 is formed on a substrate 4 such as silicon, and the core 6 serving as a light guide is covered with the clad 7. It is a waveguide.

  The optical waveguide layer 5 is manufactured using, for example, an acrylic organic solvent, and the relative refractive index difference Δn between the core 6 and the clad 7 is 0.8%. The cross section of the core 6 is, for example, a square of 40 μm × 40 μm.

  An inclined end face 9 that is inclined at an angle of 45 degrees with respect to the optical waveguide layer 5 is provided at the first end portion 8 of the optical waveguide layer 5 as a light reflecting surface, and is formed so as to protrude from the substrate 4. The optical waveguide 3 is provided with two through holes (diameter of about 100 μm) 12 on the left and right sides with the core 6 interposed therebetween, and is formed so as to be concavo-convexly fitted with the protrusion 21 provided on the mounting substrate 20 side. Has been.

  On the mounting substrate 20, a surface emitting laser diode such as a VCSEL is fixed as a surface optical element 30, and two cylindrical projections 21 having a diameter of about 100 μm are provided on both sides thereof. . When the two protrusions 21 are concavo-convexly fitted with the two through holes 12 provided in the optical waveguide 3, the position of the optical coupling device 10 is fixed on the mounting substrate 20. In this fixed position, the inclined end face 9 is disposed at a position facing the light emitting or light receiving portion 31 of the optical element 30 and is aligned so that the optical axis of the optical element 30 and the optical path of the optical waveguide layer 5 coincide. Is done.

  The means for positioning the optical coupling device 10 on the mounting substrate 20 has exemplified the combination of the through hole 12 and the protrusion 21 as an example. Well, more broadly, not limited to the concave-convex fitting, any means can be used as long as it can be positioned.

  FIG. 2 shows a method of mounting the optical coupling device 10 on the mounting substrate 20 by positioning by fitting the concave and convex portions between the through hole 12 and the protrusion 21. The cross-sectional view before fitting (a) and after fitting It is sectional drawing (b). As shown in FIG. 2, the optical coupling is performed while adjusting the position of the optical coupling device 10 in the direction parallel to the surface of the mounting substrate 20 so that the protrusions 21 are inserted into the through holes 12 during the fitting. The apparatus 10 is pushed down in a direction perpendicular to the substrate surface. At this time, means for assisting fitting such as guide means may be provided. Desorption is performed by reversing the mounting, and the optical coupling device 10 is pulled away in a direction perpendicular to the substrate surface.

  As described above, the optical coupling device 10 is attached / detached by inserting / removing the optical coupling device 10 in a direction perpendicular to the surface of the mounting substrate 20, so that no space for attachment / detachment is required on the mounting substrate 20. For this reason, as shown in FIG. 2, the other element 32 can be disposed close to the optical element 30. Therefore, there is no problem that the mounting density is reduced by mounting the optical coupling device 10 or the optical coupling device 10 cannot be mounted on a highly integrated mounting substrate in which elements are densely arranged, and the mounting structure is reduced in size. High density can be realized.

  Further, if the light receiving or light emitting portion 31 of the optical element 30 or the positional relationship between the protrusion 21 and the optical element 30 is made common among different optical elements, the optical coupling device 10 can have the through hole 12 and the protrusion for any optical element. The optical coupling can be formed by the concave-convex fitting with 21. In this case, the optical coupling device 10 has an optical connector type coupling configuration in which the optical element to be connected can be changed as necessary.

  The mounting structure illustrated in FIG. 1 functions as a light-emitting module that outputs light emitted from a light-emitting element to the outside, or a light-receiving module that receives light input from the outside and converts it into an electrical signal or the like. That is, when the planar optical element 30 is a planar light emitting element 30 such as a VCSEL, the light emitted upward from the light emitting portion 31 of the light emitting element 30 to the surface of the mounting substrate 20 is an optical waveguide layer. 5 enters from below, is reflected by the inclined end face 9, is guided to the optical waveguide core 6, and is sent out from the optical fiber 1 through the coupling portion between the optical waveguide 3 and the optical fiber 1. When the surface optical element 30 is a surface light receiving element such as a photodiode, the light input from the outside through the optical fiber passes through the coupling portion between the optical waveguide 3 and the optical fiber 1. The light is guided to the waveguide core 6, reflected by the inclined end surface 9, and sent to the light receiving surface 31 of the light receiving element 30 vertically downward to the surface of the mounting substrate 20.

  As described above, for example, by processing one end of the optical waveguide layer at an angle of 45 degrees, the light incident on the end in a direction perpendicular to the mounting substrate surface is reflected by the processed surface. The optical path can be changed in a direction parallel to the mounting substrate surface in a compact manner and guided to the core of the optical waveguide provided in the direction parallel to the mounting substrate surface. Further, by connecting an optical fiber to the other end of the optical waveguide, it is possible to take out the light propagated through the core from the optical fiber. An inclined end face such as an inclined 45 degree inclined face can be easily formed by dicing.

  For example, by providing a detachable positioning means such as a combination of a through hole or a recess and a protrusion to the above structure, it can be attached and detached in a direction perpendicular to the mounting substrate surface and in a direction parallel to the mounting substrate surface. An optical coupling device having an optical connector type capable of extracting light can be realized.

  The present embodiment can be applied to a surface light emitting / receiving element mounted on a printed circuit board, can be downsized and highly integrated in a mounting structure, and can be integrated with an optical circuit in an optical waveguide portion. An optical coupling device having the following is provided. Since this optical coupling device can be attached / detached in a direction perpendicular to the printed circuit board surface, it can be easily attached / detached even to a highly integrated substrate on which elements are densely arranged.

Embodiment 2
FIG. 3 is a perspective view showing an optical coupling device and its mounting structure according to Embodiment 2 of the present invention. The mounting structure shown in FIG. 3 includes an optical coupling device 10, an optical element 30, and a mounting substrate 20 on which the optical element 30 is fixed and the optical coupling device 10 is fixed. However, in this specification, even if the size is different, the same number is given if the function is the same (the same applies hereinafter).

  The difference from the first embodiment is that the optical coupling device 10 of the first embodiment comprises a single core 6, whereas the optical waveguide 3 of the present embodiment has five cores 6 arranged in parallel. In other words, the five surface optical elements 30 are fixed and mounted on the mounting substrate 20 in an array correspondingly.

  Thus, by providing a plurality of cores 6 in parallel in the optical waveguide layer 5, the multi-channel optical coupling device 10 having the optical connector type can be easily realized. By miniaturizing the arrangement interval of the cores 6 in the optical waveguide layer 5, it is possible to realize a multi-channel optical coupling device in which light guides are arranged at a finer pitch than arranging optical fibers, and on a highly integrated mounting substrate. A structure suitable for coupling with the optical element can be realized.

  The optical coupling device and the mounting structure thereof according to the second embodiment of the present invention are not different from the first embodiment in other respects, and needless to say, have the same characteristics as those of the first embodiment. That is, for example, by processing one end of the optical waveguide layer at an angle of 45 degrees, light incident in a direction perpendicular to the mounting substrate surface with respect to this end can be compactly reflected by the processing surface. The optical path can be changed in a direction parallel to the surface of the optical waveguide and guided to the core of the optical waveguide provided in the direction parallel to the mounting substrate surface. Further, by connecting an optical fiber to the other end of the optical waveguide, it is possible to take out the light propagated through the core from the optical fiber. An inclined end face such as an inclined 45 degree inclined face can be easily formed by dicing.

  For example, by providing a detachable positioning means such as a combination of a through hole or a recess and a protrusion to the above structure, it can be attached and detached in a direction perpendicular to the mounting substrate surface and in a direction parallel to the mounting substrate surface. An optical coupling device having an optical connector type capable of extracting light can be realized.

  The present embodiment can be applied to a surface light emitting / receiving element mounted on a printed circuit board, can be downsized and highly integrated in a mounting structure, and can be integrated with an optical circuit in an optical waveguide portion. An optical coupling device having the following is provided. Since this optical coupling device can be attached / detached in a direction perpendicular to the printed circuit board surface, it can be easily attached / detached even to a highly integrated substrate on which elements are densely arranged.

Embodiment 3
FIG. 4 is a perspective view showing an optical coupling device and its mounting structure according to Embodiment 3 of the present invention. The mounting structure shown in FIG. 4 includes an optical coupling device 40, an optical element 30, and a mounting substrate 20 to which the optical element 30 is fixed and the optical coupling device 40 is fixed.

  The difference from the first embodiment is that the core 16 of the optical waveguide 13 of the present embodiment has a branch structure in which a single core portion is branched into two core portions by a core branch portion 17. is there. By providing a branching structure in the core 16, it is possible to form a branching type optical coupling device 40 that can transmit a signal output from one optical element to the two optical fibers 1. Conversely, two lights transmitted from the two optical fibers 1 can be combined and received by one optical element.

  As in these examples, a branching structure, a multiplexing structure, or an optical circuit having a more complicated function can be incorporated in the optical waveguide portion of the optical coupling device. Thereby, compared with the optical coupling device comprised only with the optical fiber, a more highly functional optical coupling device is realizable.

  The optical coupling device and the mounting structure thereof according to the third embodiment of the present invention are not different from the first embodiment in other respects, and needless to say, have the same characteristics as the first embodiment. That is, for example, by processing one end of the optical waveguide layer at an angle of 45 degrees, light incident in a direction perpendicular to the mounting substrate surface with respect to this end can be compactly reflected by the processing surface. The optical path can be changed in a direction parallel to the surface of the optical waveguide and guided to the core of the optical waveguide provided in the direction parallel to the mounting substrate surface. Further, by connecting an optical fiber to the other end of the optical waveguide, it is possible to take out the light propagated through the core from the optical fiber. An inclined end face such as an inclined 45 degree inclined face can be easily formed by dicing.

  For example, by providing a detachable positioning means such as a combination of a through hole or a recess and a protrusion to the above structure, it can be attached and detached in a direction perpendicular to the mounting substrate surface and in a direction parallel to the mounting substrate surface. An optical coupling device having an optical connector type capable of extracting light can be realized.

  The present embodiment can be applied to a surface light emitting / receiving element mounted on a printed circuit board, can be downsized and highly integrated in a mounting structure, and can be integrated with an optical circuit in an optical waveguide portion. An optical coupling device having the following is provided. Since this optical coupling device can be attached / detached in a direction perpendicular to the printed circuit board surface, it can be easily attached / detached even to a highly integrated substrate on which elements are densely arranged.

Embodiment 4
FIG. 5 is a perspective view showing an optical coupling device and its mounting structure according to Embodiment 4 of the present invention. The mounting structure shown in FIG. 5 includes an optical coupling device 40, an optical element 30, and a mounting substrate 20 to which the optical element 30 is fixed and the optical coupling device 40 is fixed.

  The difference from the third embodiment is that the optical waveguide of the third embodiment is composed of a single core 16, whereas the optical waveguide of the present embodiment is composed of five cores 16 arranged in parallel. Correspondingly, the five planar optical elements 30 are also fixed in an array on the mounting substrate 20. Moreover, unlike the optical waveguide of the second embodiment, the core 16 of the optical waveguide 13 of the present embodiment has a branch structure in which a single core portion is branched into two core portions by a core branch portion 17. Yes. In this way, it is possible to form a multi-channel branching type optical coupling device capable of transmitting signals output from five optical elements to two optical fibers 1 each, or a total of ten optical fibers. .

  By providing a plurality of cores 16 in parallel in the optical waveguide layer 15 as in this example, the multi-channel optical coupling device 40 having an optical connector type can be easily realized. By miniaturizing the arrangement interval of the cores 16 in the optical waveguide layer 15, it is possible to realize a multi-channel optical coupling device in which light guides are arranged at a finer pitch than arranging optical fibers, and on a highly integrated mounting substrate A structure suitable for coupling with the optical element can be realized. In addition, by incorporating an optical circuit having a branching structure, a multiplexing structure, or a more complicated function into the optical waveguide 13, an optical coupling device having a higher function than that of an optical coupling device composed only of optical fibers can be obtained. Can be realized.

  The optical coupling device and its mounting structure according to the fourth embodiment of the present invention are the same as those of the third embodiment in other respects, and needless to say, have the same characteristics as those of the third embodiment. That is, for example, by processing one end of the optical waveguide layer at an angle of 45 degrees, light incident in a direction perpendicular to the mounting substrate surface with respect to this end can be compactly reflected by the processing surface. The optical path can be changed in a direction parallel to the surface of the optical waveguide and guided to the core of the optical waveguide provided in the direction parallel to the mounting substrate surface. Further, by connecting an optical fiber to the other end of the optical waveguide, it is possible to take out the light propagated through the core from the optical fiber. An inclined end face such as an inclined 45 degree inclined face can be easily formed by dicing.

  For example, by providing a detachable positioning means such as a combination of a through hole or a recess and a protrusion to the above structure, it can be attached and detached in a direction perpendicular to the mounting substrate surface and in a direction parallel to the mounting substrate surface. An optical coupling device having an optical connector type capable of extracting light can be realized.

  The present embodiment can be applied to a surface light emitting / receiving element mounted on a printed circuit board, can be downsized and highly integrated in a mounting structure, and can be integrated with an optical circuit in an optical waveguide portion. An optical coupling device having the following is provided. Since this optical coupling device can be attached / detached in a direction perpendicular to the printed circuit board surface, it can be easily attached / detached even to a highly integrated substrate on which elements are densely arranged.

Embodiment 5
FIG. 6 is a plan view (a) and a perspective view (b) showing an optical coupling device and its mounting structure according to Embodiment 5 of the present invention. The mounting structure shown in FIG. 6 includes an optical coupling device 50, an optical element 30, a mounting substrate 20 to which the optical element 30 is fixed, and the like.

  The optical coupling device 50 includes an optical fiber 1, an optical waveguide 51, an optical waveguide 55, and the like. The optical fiber 1 is aligned and fixed by the optical fiber block 2, and is optically coupled and bonded and fixed at the second end portion 11 of the optical waveguide 51 so that the optical paths of the optical waveguide 51 and each other coincide. The optical waveguide 51 and the optical waveguide 55 are connected to a core 53 that is a light guide path at a connection portion 56.

  The optical waveguide 51 is an embedded optical system in which an optical waveguide layer 52 made of a joined body of a core 53 and a clad 7 is formed on a substrate 4 such as silicon, and the core 53 serving as a light guide is covered with the clad 7. It is a waveguide.

  The optical waveguide 51 is manufactured using, for example, an acrylic organic solvent, and the relative refractive index difference Δn between the core 53 and the clad 7 is 0.8%. Moreover, the cross section of the core 53 is a square of 40 μm × 40 μm, for example.

  The optical waveguide 55 is configured in the same manner as the optical waveguide 51, but is different from the optical waveguide 51 in that it is a thin film optical waveguide without a substrate. An optical waveguide without a substrate is produced by, for example, producing an optical waveguide layer on a substrate in the same manner as an ordinary optical waveguide and then peeling the optical waveguide layer from the substrate.

  The optical waveguide 51 and the optical waveguide 55 may be manufactured separately or may be processed into two parts after being manufactured as a single unit. As the latter method, for example, after an optical waveguide layer is formed on a substrate, a part of the substrate is peeled off and a thin film optical waveguide from which the substrate has been removed is cut into each core portion. There is.

  When the optical waveguide 51 and the optical waveguide 55 are viewed as a whole, the optical path is a three-branch type optical waveguide. That is, when light propagates from the left to the right in FIG. 6, the light respectively propagated through the three core portions of the optical waveguide 55 is multiplexed at the core multiplexing portion 54 of the optical waveguide 51, and one light To the optical fiber 1. Conversely, when light propagates from right to left in FIG. 6, the light incident from the optical fiber 1 as one light is demultiplexed by the core multiplexing unit 54 of the optical waveguide 51, and each core of the optical waveguide 55 is separated. Sent to the department.

  Since the optical waveguide divided into three of the optical waveguide 55 has no substrate and is thinly divided, it has a flexible shape, and its tip can be arranged in an arbitrary direction. The first end portion 57 of each of the three optical waveguides 55 is provided with an inclined end surface 58 inclined at an angle of 45 degrees with respect to the optical waveguide layer as a light reflecting surface. The first end portion 57 is provided with a fixing pin 59 for positioning the optical waveguide 55 on the substrate 20, and the fixing pin 59 is fitted in the hole 22 provided on the mounting substrate 20 side. Is formed.

  On the mounting substrate 20, a surface emitting laser diode such as a VCSEL is fixed as the surface optical element 30, and rectangular holes 22 are formed on both sides thereof. By inserting a fixing pin 59 provided on the optical waveguide 55 into the hole 22, the position of the optical coupling device 50 is fixed on the mounting substrate 20. In this fixed position, the inclined end surface 58 is disposed at a position facing the light emitting or light receiving unit 31 of the optical element 30 and the optical axis of the optical element 30 and the optical path of the optical waveguide layer 55 are aligned. Is done. The optical coupling device 50 can function as an optical coupling device having a detachable connector type structure by fitting the fixing pin 59 and the hole 22 together.

  The means for positioning the first end portion 57 of the optical waveguide layer 55 on the mounting substrate 20 has exemplified the combination of the fixing pin 59 and the hole 22 as an example, but is not limited to this. Any means can be used as long as it is not limited to the concave-convex fitting.

  FIG. 7 is a perspective view (a) of the first end portion 57 of the optical waveguide layer 55 provided with the fixing pin 59 and a state in which the first end portion 57 is positioned on the mounting substrate 20 and fixed in position. It is sectional drawing (b) which shows this. At the time of fitting, the fixing pin 59 is placed on the substrate surface while adjusting the position of the first end portion 57 in the direction parallel to the surface of the mounting substrate 20 so that the fixing pin 59 is inserted into the hole 22. Press down in the orthogonal direction. At this time, means for assisting fitting such as guide means may be provided. Desorption is performed by reversing the mounting, and the first end 57 is pulled away in a direction perpendicular to the substrate surface.

  As described above, the first end portion 57 of the optical waveguide layer 55 is attached / detached by inserting / removing the first end portion 57 in a direction perpendicular to the surface of the mounting substrate 20. You don't need space for. For this reason, other elements can be arranged close to the optical element 30. Therefore, there is no problem that the mounting density is reduced by mounting the optical coupling device 50, or that the optical coupling device 50 cannot be mounted on a highly integrated mounting board in which elements are densely arranged. Densification can be realized.

  In addition, if the positional relationship between the light receiving or light emitting portion 31 of the optical element 30 and the hole 22 is made common among different optical elements, the optical coupling device 50 can fix the fixing pin 59 and the hole for any optical element. The optical coupling can be formed by mating with 22. In this case, the optical coupling device 50 has an optical connector type coupling configuration in which the optical element to be connected can be changed as necessary.

  In addition, at this time, the optical waveguide divided into three optical waveguides 55 has a flexible shape, and the first end portion 57 can be arranged in an arbitrary direction and is fixed to the mounting substrate 20. The ability to form an optical coupling with a desired one of the optical elements 30 is one significant feature. Thereby, for example, it becomes possible to couple a plurality of optical elements 30 at positions separated on the mounting substrate 20 with one optical coupling device 50, and the desired light is not restricted by the position on the mounting substrate. The element 30 and the optical coupling device 50 can be optically coupled.

  The mounting structure illustrated in FIG. 6 functions as a light-emitting module that outputs light emitted from a light-emitting element to the outside or a light-receiving module that receives light input from the outside and converts it into an electrical signal or the like. When the surface-type optical element 30 is a surface-type light-emitting element 30 such as a VCSEL, for example, each light emitted vertically upward from the light-emitting portions 31 of the three light-emitting elements 30 to the surface of the mounting substrate 20 is respectively Is incident on the optical waveguide 55 optically coupled to the light emitting element 30 from below, is reflected by the inclined end surface 58, is guided to the optical waveguide core 53, and is multiplexed into one light by the core multiplexing unit 54, and is optical fiber. 1 is emitted. For example, when the three incident lights are R (red), G (green), and B (blue) three primary color lights, white light by RGB combining can be obtained as an output, and a point light source of a micro display It is possible to provide a useful light source module. Further, when the surface optical element 30 is a surface light receiving element such as a photodiode, the light input from the outside through the optical fiber 1 is divided into three lights by the core multiplexing unit 54 to receive three light beams. It is sent to the light receiving surface 31 of the element 30.

  As described above, for example, by processing one end of the optical waveguide layer at an angle of 45 degrees, the light incident on the end in a direction perpendicular to the mounting substrate surface is reflected by the processed surface. The optical path can be changed in a direction parallel to the mounting substrate surface in a compact manner and guided to the core of the optical waveguide provided in the direction parallel to the mounting substrate surface. Further, by connecting an optical fiber to the other end of the optical waveguide, it is possible to take out the light propagated through the core from the optical fiber. An inclined end face such as an inclined 45 degree inclined face can be easily formed by dicing.

  For example, by attaching a detachable positioning means such as a combination of a fixing pin and a hole to the above structure, light can be taken out in a direction perpendicular to the mounting substrate surface and parallel to the mounting substrate surface. It is possible to realize an optical coupling device having an optical connector type configuration.

  Furthermore, by forming a part of the first end side of the optical waveguide as a flexible thin film optical waveguide, optical coupling is formed with a desired element among the light emitting or light receiving elements fixed to the mounting substrate. be able to. In addition, when the core is branched into a plurality of core parts, it is possible to form optical coupling with a plurality of light emitting or receiving elements, and thereby, for example, a plurality of parts at positions separated on the mounting substrate. The desired optical element and the optical coupling device can be optically coupled without being restricted by the position on the mounting substrate. By using such a function, it is possible to exhibit new functions and effects that could not be considered in the conventional optical coupling device.

  The present embodiment can be applied to a surface light emitting / receiving element mounted on a printed circuit board, can be downsized and highly integrated in a mounting structure, and can be integrated with an optical circuit in an optical waveguide portion. An optical coupling device having the following is provided. Since this optical coupling device can be attached / detached in a direction perpendicular to the printed circuit board surface, it can be easily attached / detached even to a highly integrated substrate on which elements are densely arranged. Further, the flexible optical waveguide 55 described above does not necessarily have a structure in which the second end portion 11 is optically coupled to an optical fiber or the like, and can be used as an optical wiring in an FPC (Flexible Printed Circuit) manner. In this case, the first end 57 side may not have the above-described structure.

  As mentioned above, although this invention was demonstrated based on embodiment, it cannot be overemphasized that this invention is not limited to these examples at all, and can be suitably changed in the range which does not deviate from the main point of invention.

  The optical coupling device according to the present invention and its mounting form are used for input / output between optical devices and optical fibers of optical wiring applicable to various places such as between electronic devices, between boards in electronic devices or between chips in boards. It is suitably used in the interface unit, and can contribute to constructing a small-sized and high-performance optical transmission / communication system at low cost. The present invention can also be applied to a light source module that can be used as a point light source for a micro display.

It is a perspective view which shows the optical coupling device based on Embodiment 1 of this invention, and its mounting structure. The cross-sectional view before fitting and the cross-sectional view after fitting (b) showing the process of positioning the optical coupling device by concave-convex fitting. It is a perspective view which shows the optical coupling device based on Embodiment 2 of this invention, and its mounting structure. It is a perspective view which shows the optical coupling device based on Embodiment 3 of this invention, and its mounting structure. It is a perspective view which shows the optical coupling device based on Embodiment 4 of this invention, and its mounting structure. It is a perspective view which shows the optical coupling device based on Embodiment 5 of this invention, and its mounting structure. It is the perspective view (a) before fitting and the sectional view (b) after fitting showing the method of positioning an optical waveguide by uneven fitting. FIG. 4 is a cross-sectional view (a) in a connected state and a cross-sectional view (b) in a state before connection of the optical connector disclosed in Patent Document 1. FIG. 10 is a perspective view of an optomechanical connector 120 disclosed in Patent Document 2. FIG. It is sectional drawing of the optical module currently disclosed by patent document 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical fiber, 2 ... Optical fiber block, 3 ... Optical waveguide, 4 ... Substrate, such as silicon, 5 ... Optical waveguide layer, 6 ... Core, 7 ... Cladding, 8 ... 1st edge part,
9 ... Inclined end face (45 degree reflection surface), 10 ... Second end, 12 ... Through-hole, 13 ... Optical waveguide,
DESCRIPTION OF SYMBOLS 15 ... Optical waveguide layer, 16 ... Core, 17 ... Core branch part, 18 ... Strength holder,
20 ... Mounting substrate, 21 ... Protrusion, 22 ... Hole, 30 ... Surface type optical element (light receiving or light emitting element),
DESCRIPTION OF SYMBOLS 31 ... Light emission or light-receiving part, 32 ... Other elements, 50 ... Optical coupling device, 51, 55 ... Optical waveguide, 52 ... Optical waveguide layer, 53 ... Core, 54 ... Core multiplexing part, 57 ... Connection part, 57 ... A first end,
58 ... Inclined end face, 59 ... Fixed pin, 100 ... Optical connector, 101 ... Plug,
DESCRIPTION OF SYMBOLS 102 ... Ferrule, 103 ... Optical fiber, 104 ... Receiver, 105 ... Receptacle, 106 ... Plane type light emitting / receiving element, 107 ... FPC board, 108 ... Board | substrate, 120 ... Connector,
121 ... Optical fiber, 122, 126 ... Guide pin, 123, 127 ... Fixing tool,
124, 128 ... lid, 125 ... plastic capsule, 141 ... substrate,
142 ... solder bumps, 143 ... VCSEL, 144 ... light emitting part, 145 ... optical waveguide,
146: Optical waveguide core, 147: 45 degree inclined mirror, 148: Optical connector,
149 ... Spacer, 150 ... LSI (Large Scale Integrated Circuit)

Claims (20)

In an optical coupling device in which an optical waveguide and an optical fiber are optically coupled,
An inclined end surface for reflecting light into or out of the optical waveguide is formed at the first end of the optical waveguide,
And the optical waveguide and the optical fiber are optically coupled at the second end of the optical waveguide,
Attached to the mounting substrate in a state where the inclined end surface is opposed to a light emitting or receiving portion of a light emitting or receiving element fixed to the mounting substrate so that light is emitted or incident in a direction intersecting the mounting substrate surface. It is comprised so that the optical coupling device characterized by the above-mentioned.   The optical coupling device according to claim 1, wherein the optical coupling device is attached to the mounting substrate so as to be detachable in a direction intersecting the mounting substrate.   The optical coupling device according to claim 2, wherein positioning means for the light emitting or light receiving element on the mounting substrate is provided.   The optical coupling device according to claim 3, wherein the positioning unit includes a concave-convex fitting unit with the mounting substrate.   The optical coupling device according to claim 4, wherein the optical coupling device has a recess or a through hole that fits into a protrusion provided in the optical waveguide.   The optical waveguide is composed of a joined body of a core and a clad, and the core that is a light guide path is a branched structure in which a single core portion is branched into a plurality of core portions, and / or a plurality of core portions is one. The optical coupling device according to claim 1, wherein the optical coupling device has a multiplexing structure coupled to the core portion.   The optical coupling device according to claim 1, wherein at least a part of the optical waveguide on the first end side is a thin film optical waveguide having flexibility.   The optical coupling device according to claim 7, wherein the thin film optical waveguide is configured only by a joined body of a core and a clad.   The optical coupling device according to claim 1, wherein the optical waveguide is formed of a resin.   The light-emitting or light-receiving element is a surface-type light-emitting or light-receiving element, and the direction of the emitted light or incident light of this optical element is substantially perpendicular to the mounting substrate surface, and the inside of the optical waveguide at the first end portion The optical coupling device according to claim 1, wherein a direction of propagating light is configured to be substantially parallel to the mounting substrate surface. An optical coupling device, a light emitting or light receiving element, and a mounting substrate on which the optical element is fixed;
In the optical coupling device,
An optical waveguide and an optical fiber are optically coupled,
An inclined end surface for reflecting light into or out of the optical waveguide is formed at the first end of the optical waveguide,
And the optical waveguide and the optical fiber are optically coupled at the second end of the optical waveguide,
Attached to the mounting substrate in a state where the inclined end surface is opposed to a light emitting or light receiving portion of a light emitting or receiving element fixed to the mounting substrate so that light is emitted or incident in a direction intersecting the mounting substrate surface. ing,
Mounting structure of optical coupling device.   The mounting structure of the optical coupling device according to claim 11, wherein the optical coupling device is attached to the mounting substrate so as to be detachable in a direction intersecting the mounting substrate.   The mounting structure for an optical coupling device according to claim 12, wherein the optical coupling device is provided with positioning means for the light emitting or light receiving element on the mounting substrate.   The mounting structure for an optical coupling device according to claim 13, wherein the positioning unit includes a concave-convex fitting unit with the mounting substrate.   The mounting structure of the optical coupling device according to claim 14, wherein the optical coupling device has a recess or a through hole that fits into a protrusion provided in the optical waveguide.   The optical waveguide is composed of a joined body of a core and a clad, and the core that is a light guide path is a branched structure in which a single core portion is branched into a plurality of core portions, and / or a plurality of core portions is one. The mounting structure for an optical coupling device according to claim 11, wherein the optical coupling device has a multiplexing structure coupled to the core portion.   The optical coupling device mounting structure according to claim 11 or 16, wherein at least a part of the optical waveguide on the first end side is a thin film optical waveguide having flexibility.   The mounting structure of the optical coupling device according to claim 17, wherein the thin film optical waveguide is configured only by a joined body of a core and a clad.   The optical coupling device mounting structure according to claim 11, wherein the optical waveguide is formed of a resin.   The light-emitting or light-receiving element is a surface-type light-emitting or light-receiving element, and the direction of the emitted light or incident light of this optical element is substantially perpendicular to the mounting substrate surface, and the inside of the optical waveguide at the first end portion The mounting structure of the optical coupling device according to claim 11, wherein a direction of propagating light is configured to be substantially parallel to the mounting substrate surface.

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