JP4851374B2 - Optical coupler - Google Patents

Description

  The present invention relates to an optical coupler that optically couples an optical waveguide and an optical element provided on an optical circuit board with their optical axes orthogonal to each other.

  In recent years, in the field of integrated devices made of semiconductors, progress toward high speed and high density has been remarkable, and interconnections using conventional electrical wiring cannot expect sufficient characteristics due to signal delay, attenuation, interference, etc. Is a problem. This problem is said to be an IO bottleneck, and optical interconnection technology has attracted attention in order to solve this problem. The optical interconnection technology is considered to be applied not only between communication devices and between boards in a communication device, but also between integrated circuit elements in one board.

  As a conventional optical circuit board for realizing on-board optical interconnection, a multilayer printed board on which an optical waveguide disclosed in Patent Document 1 is formed is known. Here, the signal light emitted in the direction perpendicular to the substrate from the surface emitting element (VCSEL) mounted on the substrate surface is reflected by the optical path conversion mirror formed in the optical wiring to guide the optical waveguide. The guided signal light is reflected by another optical path conversion mirror and received by a surface-receiving optical element (planar photodiode).

  In an optical transmission system using an optical signal, an optical transmission path for propagating an optical signal is required in addition to a light emitting element and a light receiving element, and each light receiving and emitting element is optically coupled to the optical transmission path. . Since an optical signal is represented by the level of light intensity, it is important to maintain the light intensity in an optical transmission system. In addition, since an electric circuit board is required to mount the light emitting / receiving element, and this is mounted between the light receiving / emitting element and the optical transmission path, the light receiving / emitting element and the optical transmission path are separated from each other. . As a result, there is a problem that sufficient light intensity cannot be secured between the light emitting / receiving element and the optical transmission path.

  In the optical transmission system having such a structure, means for optically coupling between the light emitting / receiving element and the optical transmission line with high optical coupling efficiency is necessary to ensure sufficient light intensity. As an optical coupling means for realizing high optical coupling efficiency, one using an optical waveguide for propagating light between a light emitting / receiving element and an optical transmission line has been conventionally known (Patent Document 1). An optical coupling means using the optical waveguide disclosed in Patent Document 1 is shown in FIG. Here, an example is shown in which an optical waveguide (optical pin) 903 is used for optical coupling between the optical element 901 and the optical transmission line 902.

  FIG. 12 shows another example of a method for forming an optical waveguide for coupling light between an optical element and an optical transmission line. This figure shows a method of forming an optical waveguide composed of a core and a clad on an optical element mounting substrate using a mold material. That is, the mold material 914 is pushed into an uncured resin (cladding material) 913 loaded on the light receiving / emitting surface side of the optical element 901 to form a recess 915, and a core material is injected into the recess 915 to form a core 911. ing.

Patent Document 2 discloses a method of forming an optical waveguide by a so-called self-forming method. FIG. 13 shows a method of forming an optical waveguide for optical coupling using the self-forming method. In the method shown in FIG. 6A, an uncured photo-curing resin 913 is loaded as a core material on the light receiving / emitting surface side of the optical element 901, and a mask 916 provided with a through-hole at a position where a core is formed is mounted thereon. The core 911 is cured by irradiating light such as ultraviolet light from above. After the core 911 is cured, the resin in the uncured portion is removed, and a clad material is injected around the core 911 to form the clad 912. In the method shown in FIG. 13B, laser light that does not require a mask is used as the light to be applied to the photocurable resin 913.
Patent Publication 2004-85913 Patent Publication 11-326660

  However, the conventional optical coupling means has the following problems. In the conventional optical coupling means using the optical waveguide, it is necessary to form the optical waveguide on the optical element or the optical circuit substrate so that the optical axis of the optical waveguide is orthogonal to the optical axis of the optical transmission path. It has been necessary to form an optical waveguide having a core whose distance to the substrate is extremely longer than the diameter of the optical waveguide and which has a large aspect ratio (ratio of the length in the optical axis direction to the core diameter).

  However, it has been extremely difficult to form an optical waveguide having a large aspect ratio by using a mold material or to form the optical waveguide by using a self-forming method. In the method using the mold material shown in FIG. 12, after the mold material 914 is pushed in to form the recess 915, the recess 915 is deformed when the pushed mold material 914 is pulled out, or the air 917 is injected when the core material is injected. There were problems such as left behind.

  Further, in the self-forming method shown in FIG. 13A, since the photo-curing resin 913 is irradiated with ultraviolet light using the mask 916, the core 911 is formed in a tapered shape due to diffraction. there were. Further, the method shown in FIG. 13B using laser light as irradiation light has a problem that the core 911 is bent or broken when the uncured resin 913 is removed because the aspect ratio is large.

  Therefore, the present invention has been made to solve these problems. By using a waveguide in which two or more layered waveguides are stacked, a substantially large aspect ratio can be realized easily and an optical device can be realized. An object of the present invention is to provide an optical coupler having high mass productivity that can be applied when the distance to the optical circuit board is long.

The first aspect of the optical coupler of the invention, the optical transmission path of the optical circuit board substantially and a provided parallel to the optical transmission line in an electric circuit board the electric circuit board, sandwiching the electrical circuit board A third optical axis of the optical element when the second optical axis is an optical axis orthogonal to the first optical axis of the optical transmission line. One optical coupling waveguide having the second optical axis that coincides with the second optical axis, and the other optical coupling waveguide having the second optical axis that passes through a reflecting portion provided in the optical transmission path. The electrical circuit board has an opening formed at a position corresponding to the reflecting portion, and the one optical coupling waveguide is a layered waveguide having a predetermined aspect ratio on the optical element. is formed to overlap two or more layers in the second optical axis direction, the other optical coupling waveguide, the front in the opening Characterized in that it is formed by overlapping two or more layers of said layered waveguide in the optical circuit substrate to said second optical axis.

  In another aspect of the optical coupler of the present invention, the aspect ratio is 3 or less.

  In another aspect of the optical coupler of the present invention, the aspect ratio is 1.2 or less.

According to a first aspect of the optical coupler manufacturing method of the present invention, an optical element is optically coupled to an optical circuit board including an electric circuit board and an optical transmission path provided substantially parallel to the electric circuit board. A method of manufacturing an optical coupler including a laminated optical waveguide for loading an uncured cladding material on a light receiving / emitting surface side of the optical element or an opening of the electric circuit board as a first step Pressing the mold material into the uncured clad material, curing the clad material, removing the mold material, and removing the mold material into the recess formed in the clad material to uncured core material Forming a layered waveguide by a process including: loading a non-cured clad material onto the already formed layered waveguide; and Mold material for the cladding material Stiffening, curing the clad material, removing the mold material, and removing the mold material, loading the uncured core material into the recess formed in the clad material, and curing it. A layered waveguide is formed by an included process, and two or more layers of the layered waveguide are formed by repeating the second step one or more times.

  According to another aspect of the method of manufacturing an optical coupler of the present invention, an optical element is optically coupled to an optical circuit board including an electric circuit board and an optical transmission path provided substantially parallel to the electric circuit board. A method of manufacturing an optical coupler including the laminated optical waveguide according to claim 1, wherein, as a first step, an uncured photocurable core material is provided on the light emitting / receiving surface side of the optical element or the opening of the electric circuit board. A step of loading, a step of irradiating light to a predetermined position of the core material to cure the core material into a predetermined core shape, a step of removing an uncured portion of the core material, and a cladding material around the cured core material Loading and curing, and forming a layered waveguide by a process including a step of loading an uncured photocurable core material onto the already formed layered waveguide as a second process; Irradiate light to a predetermined position of the core material to form a predetermined core After forming the layered waveguide, a layered waveguide is formed by a process including a step of removing an uncured portion of the core material and a step of loading and curing a clad material around the cured core material, The step is repeated one or more times to form two or more layered waveguides.

  As described above, according to the present invention, there is provided an optical coupler including two or more layered waveguides having a small aspect ratio that can be easily manufactured, and an optical waveguide having a substantially large aspect ratio by laminating them. It becomes possible to do. Therefore, according to the present invention, it is easy to obtain high optical coupling efficiency even when the distance between the optical element and the optical circuit board is large. In addition, according to the method of manufacturing an optical coupler of the present invention, a layered waveguide can be easily manufactured by reducing the aspect ratio, and an optical waveguide having a substantially large aspect ratio can be obtained by stacking two or more of these. The provided optical coupler can be easily manufactured.

  A configuration of an optical coupler and a manufacturing method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.

  Embodiments of the optical coupler of the present invention will be described below with reference to FIGS. In FIG. 1, the optical element 110 is fixed to an optical element mounting substrate 111, which is placed on the optical circuit board 120 and fixed with solder 131 and sealing resin 132. The optical circuit board 120 includes an electric circuit board 121 and an optical transmission path 122 provided in parallel therewith, and an optical axis of the optical transmission path 122 (hereinafter referred to as a first optical axis) is an electric circuit. It is configured to be parallel to the substrate 121.

  On the other hand, the optical axis of the optical element 110 (hereinafter referred to as the third optical axis) is set in a direction perpendicular to the optical circuit board 120. Therefore, in order to convert the first optical axis of the optical transmission path 122 into the third optical axis of the optical element 110, the reflection section 123 is provided in the optical transmission path 122. The optical transmission path 122 has a configuration in which the first optical axis is converted by 90 degrees in the direction perpendicular to the optical circuit board 120 by the reflection unit 123 and optically coupled to the optical element 110.

  An electric circuit board 121 is provided between the optical element 110 and the optical transmission path 122, and solder 131 is provided to fix the optical element mounting board 111 on the optical circuit board 120. For this reason, the distance between the optical transmission line 122 and the optical element 110 becomes large. However, in order to prevent light loss between them, the optical coupler 110 of the present embodiment shown in FIG. And an optical coupling waveguide 142 formed on the optical circuit board 120 (opening portion of the electric circuit board 121). Thus, the entire section between the optical element 110 and the optical transmission path 122 is optically coupled by the optical coupling waveguides 141 and 142. The optical axes of the optical coupling waveguides 141 and 142 (hereinafter referred to as the second optical axis) coincide with the third optical axis of the optical element 110 and are orthogonal to the first optical axis of the optical transmission path 122. is doing.

  The optical coupling between the optical element 110 and the optical transmission path 122 is not necessarily required to provide an optical coupling waveguide in the entire section. Like the optical coupler 101 shown in FIG. The optical coupling waveguide 141 may be provided only on the surface side, or the optical coupling is performed only on the optical circuit board 120 (the opening of the electric circuit board 121) as in the optical coupler 102 shown in FIG. A waveguide 142 may be provided. By using any of the optical couplers 100, 101, or 102, the optical loss between the optical transmission path 122 and the optical element 110 can be reduced.

  The optical coupling waveguides 141 and 142 constituting the optical couplers 100, 101, and 102 of the present embodiment each include a core 143 and a clad 144, and in the optical coupler 100, the core 143a and the core 143b coincide with each other. So connected. Since the distance between the optical element 110 and the optical waveguide 122 is large, both of the optical coupling waveguides 141 and 142 are longer in the optical axis direction than the length of the diameter of the cores 143a and 143b. That is, the aspect ratios of the optical coupling waveguides 141 and 142 are both large values.

  As described above, there has been a large manufacturing problem in forming a waveguide having a large aspect ratio. However, in the optical couplers 100, 101, and 102 of this embodiment, the optical coupling waveguides 141 and 142 are not provided. Two or more layered waveguides 145 having a small aspect ratio are stacked. It is relatively easy to form a waveguide having a small aspect ratio, and the layered waveguide 145 can be easily formed by using the optical coupler manufacturing method of the present invention as described later.

  The layered waveguide 145 includes a layered core 146 and a layered clad 147, and the optical coupling waveguides 141 and 142 can be formed by overlapping a plurality of layers so that the positions of the layered core 146 coincide. In the present embodiment, a self-forming layered waveguide 145 that forms a layered core 146 by irradiating light onto a predetermined core material is used.

  The aspect ratio of the layered waveguide 145 is preferably 3 or less, more preferably 1.2 or less. As described above, the layered waveguide 145 in which the length in the optical axis direction is shortened with respect to the diameter of the layered core 146 to reduce the aspect ratio can be easily manufactured and the layered core 146 can be stably formed.

  As described above, in this embodiment, the optical coupling waveguides 141 and 142 having a substantially large aspect ratio can be manufactured by laminating two or more layered waveguides 145 having a small aspect ratio, and this is provided. The optical coupler 100, 101, or 102 can be easily provided. According to the present embodiment, for example, an optical coupling waveguide having an aspect ratio of 10, which has conventionally been difficult to form, can be substantially realized by stacking five optical waveguide layers having an aspect ratio of 2. .

  Another embodiment of the optical coupler of the present invention is shown in FIGS. Also in this embodiment, optical coupling waveguides 241 and 242 having a substantially large aspect ratio are provided between the optical transmission path 122 and the optical element 110. That is, the optical coupler 200 shown in FIG. 4 has an optical coupling formed on the optical coupling waveguide 241 and the optical circuit board 120 (an opening of the electric circuit board 121) formed on the light receiving and emitting surface side of the optical element 110. For this reason, the entire section between the optical element 110 and the optical transmission path 122 is optically coupled.

  Further, in the optical coupler 201 shown in FIG. 5, the optical coupling waveguide 241 is provided only on the light receiving / emitting surface side of the optical element 110, and in the optical coupler 202 shown in FIG. The optical coupling waveguide 242 is provided only in the opening portion of the circuit board 121. By using any of the optical couplers 200, 201, or 202, it is possible to reduce the optical loss between the optical transmission line 122 and the optical element 110.

  Also in the optical couplers 200, 201, and 202 of this embodiment, the optical coupling waveguides 241 and 242 are formed by stacking two or more layered waveguides 245 having a small aspect ratio. The layered waveguide 245 used in this embodiment is a waveguide in which a layered core 246 is formed in a recess formed by using a mold at a substantially central portion of the layered clad material 247. In the layered waveguide 245 formed using such a mold, the layered core 246 is formed with the clad material left on one end face in the optical axis direction.

  Also in this embodiment, the aspect ratio of the layered waveguide 245 is preferably 3 or less, and more preferably 1.2 or less. By laminating two or more layered waveguides 245 having a small aspect ratio, it is possible to easily provide the optical couplers 200, 201, and 202 including the optical coupling waveguides 241 and 242 having a substantially large aspect ratio. It becomes.

  Next, the manufacturing method of the optical coupler of this invention is demonstrated below using drawing. FIG. 7 is a diagram illustrating a method for manufacturing an optical coupler according to an embodiment of the present invention. The manufacturing method of the optical coupler of this embodiment can be applied to any of the optical couplers 100, 101, 102, 200, 201, and 202 described above. FIG. 7 shows a process of manufacturing the optical coupler 201 having the optical coupling waveguide 241 on the optical element 110.

  First, an uncured clad material 301 is loaded on the light receiving / emitting surface side of the optical element 110 until it reaches a predetermined thickness (the thickness of the layered waveguide 245), and a mold 310 having a predetermined shape is pushed in (FIG. 7 ( a)). Next, the clad material 301 is cured while the mold is pushed in, and after the curing, the mold 310 is removed (FIG. 7B). The mold 310 used here includes an insertion piece 311 having a diameter substantially equal to that of the layered core 246 and a length equal to or longer than the length of the optical coupling waveguide 241.

  Next, the core material 302 is loaded into the recess 312 formed in the clad material 301 and is cured (FIG. 7C). The first layered waveguide 245 in which the layered core 246 is formed at the center of the layered clad 247 can be formed by the first process as described above.

  In the next second step, the uncured clad material 301 is loaded on the first layered waveguide 245 formed on the light receiving / emitting surface side of the optical element 110 as described above until a predetermined thickness is reached. Then, the mold 310 having a predetermined shape is pushed in. Next, the clad material 301 is cured in a state where the mold is pushed in, and after the curing, the mold 310 is removed. Then, the core material 302 is loaded into the recess 312 formed in the clad material 301 and is cured. As a result, the second layered waveguide 245 is formed.

  When the layered waveguide 245 is further formed and laminated, the second step is repeated as many times as necessary. As a result, as shown in FIG. 7D, the optical coupling waveguide 241 having a required length can be formed on the optical element 110. For example, the optical coupler 201 shown in FIG. 5 is manufactured. Is possible.

  In the above description, the case where the layered waveguide is laminated on the light receiving and emitting surface side of the optical element 110 has been described. However, the same applies to the case where the layered waveguide is laminated on the optical circuit board (the opening of the electric circuit board). is there.

  Another embodiment of the method for manufacturing an optical coupler of the present invention will be described below with reference to FIG. The manufacturing method of the optical coupler of the present embodiment is to manufacture the layered waveguide 245 using a mold as in the manufacturing method of the first embodiment, but the mold used in this embodiment is used. The shape of 410 is different from the mold 310.

  In the mold 410 used in this embodiment, the length of the insertion piece 411 is substantially equal to the length of the layered waveguide 245. By making the length of the insertion piece 411 substantially equal to the length of the layered waveguide 245, the clad material 301 is pressed flat by the pressing piece 413. By using such a mold 410, the layered waveguide 245 can be formed while the surface of the clad material 301 is formed flat.

  When such a mold 410 is used, the height of the support 112 of the optical element mounting substrate 111 is preferably the same as the surface of the clad material 301 so that the pressing piece 413 reaches the surface of the clad material 301. In FIG. 8, the concave portion 312 is formed with the height of the support portion 112 being the same as the surface of the clad material 301.

  The process of manufacturing the optical coupling waveguide 241 in the present embodiment is the same as the manufacturing method of the first embodiment except that the mold 410 is used instead of the mold 310. Further, the method of manufacturing the optical coupler of the present embodiment can also be applied to any of the optical couplers 100, 101, 102, 200, 201, and 202 described above. By laminating the required number of layered waveguides 245, an optical coupling waveguide 241 having a required length can be formed on the optical element 110 as shown in FIG. 8D. For example, FIG. It becomes possible to manufacture the optical coupler 201 shown.

  Still another embodiment of the method for manufacturing an optical coupler of the present invention will be described below with reference to FIG. The manufacturing method of the optical coupler of this embodiment applies the manufacturing method of the self-forming waveguide which forms a core using photocurable resin to manufacture of a layered waveguide.

  First, an uncured photo-curing resin 501 is loaded on the light receiving / emitting surface side of the optical element 110 until it reaches a predetermined thickness (the thickness of the layered waveguide 245). (FIG. 9A). A hole is formed in the mask 510 at a position where the layered core 246 is to be formed, and the photocurable resin 501 in this portion is cured. For example, ultraviolet light is used as the irradiation light.

  Next, the uncured photocurable resin 501 other than the cured layered core 246 is removed (FIG. 9B). Next, the clad material 301 is loaded on the portion where the uncured photocurable resin 501 has been removed, and is cured (FIG. 9C). Through the first process described above, the first layered waveguide 245 is formed.

  As described in FIG. 13, when the layered waveguide 245 is formed by irradiating light, the layered core 246 is formed in a tapered shape due to light diffraction or the like, but in this embodiment, the length in the optical axis direction is increased. Therefore, the expansion of the diameter of the layered core 246 is very small and does not cause a problem.

  In the next second step, an uncured photo-curing resin 501 is loaded on the first layered waveguide 245 until a predetermined thickness is reached, and a mask 510 is placed thereon to irradiate light. To do. A hole is formed in the mask 510 at a position where the layered core 246 is to be formed, and the photocurable resin 501 in this portion is cured. Next, the uncured photocurable resin 501 other than the portion of the cured layered core 246 is removed. Then, the clad material 301 is loaded on the portion where the uncured photocurable resin 501 has been removed, and is cured. As a result, the second layered waveguide 245 is formed.

  When the layered waveguide 245 is further formed and laminated, the second step is repeated as many times as necessary. As a result, as shown in FIG. 9D, an optical coupling waveguide 241 having a required length can be formed on the optical element 110. For example, the optical coupler 101 shown in FIG. 2 is manufactured. Is possible.

  In the above description, the case where the layered waveguide is laminated on the light receiving and emitting surface side of the optical element 110 has been described. However, the same applies to the case where the layered waveguide is laminated on the optical circuit board (the opening of the electric circuit board). is there.

  Still another embodiment of the method of manufacturing an optical coupler of the present invention will be described below with reference to FIG. The manufacturing method of the optical coupler of this embodiment forms a layered core 246 by irradiating a photocurable resin with laser light. When laser light is used, it is possible to irradiate light within a predetermined range in a straight line, so that the mask 510 need not be used.

  First, an uncured photo-curing resin 501 is loaded on the light receiving / emitting surface side of the optical element 110 until a predetermined thickness (the thickness of the layered waveguide 245) is reached, and the layered core 246 is formed from the top. Laser light is directly irradiated (FIG. 10A).

  Next, the uncured photocurable resin 501 other than the cured layered core 246 is removed (FIG. 10B). Next, the clad material 301 is loaded on the portion from which the uncured photocurable resin 501 has been removed, and is cured (FIG. 10C). Through the first process described above, the first layered waveguide 245 is formed.

  In the next second step, an uncured photocurable resin 501 is loaded on the first layered waveguide 245 until a predetermined thickness is reached, and laser light is formed at a position where the layered core 246 is formed. Irradiate directly. Next, the uncured photocurable resin 501 other than the portion of the cured layered core 246 is removed. Then, the clad material 301 is loaded on the portion where the uncured photocurable resin 501 has been removed, and is cured. As a result, the second layered waveguide 245 is formed.

  When the layered waveguide 245 is further formed and laminated, the second step is repeated as many times as necessary. As a result, as shown in FIG. 10D, an optical coupling waveguide 241 having a required length can be formed on the optical element 110. For example, the optical coupler 101 shown in FIG. 2 is manufactured. Is possible.

  In the above description, the case where the layered waveguide is laminated on the light receiving and emitting surface side of the optical element 110 has been described. However, the same applies to the case where the layered waveguide is laminated on the optical circuit board (the opening of the electric circuit board). is there.

  As still another embodiment of the method of manufacturing an optical coupler according to the present invention, a core portion having a predetermined shape is embedded in advance on the light emitting / receiving surface side of an optical element or on an optical circuit board (an opening of an electric circuit board) It is also possible to manufacture an optical coupler by forming a waveguide for optical coupling by laminating a required number of sheets in layers. In any of the optical coupler manufacturing methods described above, the optical coupling waveguide is directly formed on the optical element 110 or the optical transmission path 122, but in this embodiment, it is created in advance. To provide a predetermined optical coupling waveguide by using a sheet as a layered waveguide and laminating a required number of sheets along the second optical axis, and to provide an optical coupler using the waveguide Is possible.

  In addition, the description in this Embodiment shows an example of the optical coupler which concerns on this invention, and its manufacturing method, It is not limited to this. The detailed configuration and detailed operation of the optical coupler and the manufacturing method thereof in this embodiment can be changed as appropriate without departing from the spirit of the present invention.

It is a figure which shows the structure of the optical coupler which concerns on embodiment of this invention. It is a figure which shows the structure of the optical coupler which concerns on embodiment of this invention. It is a figure which shows the structure of the optical coupler which concerns on embodiment of this invention. It is a figure which shows the structure of the optical coupler which concerns on embodiment of this invention. It is a figure which shows the structure of the optical coupler which concerns on embodiment of this invention. It is a figure which shows the structure of the optical coupler which concerns on embodiment of this invention. It is a figure explaining embodiment of the manufacturing method of the optical coupler of this invention. It is a figure explaining embodiment of the manufacturing method of the optical coupler of this invention. It is a figure explaining embodiment of the manufacturing method of the optical coupler of this invention. It is a figure explaining embodiment of the manufacturing method of the optical coupler of this invention. It is a figure which shows an example of the conventional optical coupling means. It is a figure which shows the example which forms the optical waveguide for the conventional optical coupling. It is a figure which shows the example which forms the optical waveguide for the conventional optical coupling.

Explanation of symbols

100, 101, 102, 200, 201, 202 Optical coupler 110 Optical element 111 Optical element mounting substrate 112 Support part 120 Optical circuit board 121 Electric circuit board 122 Optical transmission path 123 Reflecting part 131 Solder 132 Sealing resin 141, 142, 241 and 242 Optical coupling waveguides 143 and 243 Cores 144 and 244 Cladding 145 and 245 Layered waveguides 146 and 246 Layered cores 147 and 247 Layered cladding 301 Cladding materials 302 Core materials 310 and 410 Forms 311 and 411 Insertion pieces 312 Recesses 413 Press piece 501 Photo-curing resin 510 Mask 901 Light-emitting element 902 Optical transmission line 903 Optical waveguide 911 Core 912 Cladding 913 Photo-curing resin 914 Mold material 916 Mask

Claims (5)

The optical transmission path of the optical circuit board and a light transmission path provided substantially in parallel to the electrical circuit board to the electric circuit board, an optical coupler for optically coupling the optical element across the electrical circuit board There,
One optical coupling having the second optical axis coincident with the third optical axis of the optical element when an optical axis orthogonal to the first optical axis of the optical transmission line is a second optical axis A waveguide ;
The other optical coupling waveguide having the second optical axis that passes through the reflecting portion provided in the optical transmission path, and
The electrical circuit board has an opening formed at a position corresponding to the reflective portion,
The one optical coupling waveguide is formed by stacking two or more layered waveguides having a predetermined aspect ratio on the optical element in the second optical axis direction ,
The other optical coupling waveguide is formed by stacking two or more layered waveguides in the second optical axis direction on the optical circuit board in the opening . . The optical coupler according to claim 1 , wherein the aspect ratio is 3 or less. The optical coupler according to claim 2 , wherein the aspect ratio is 1.2 or less. An optical coupler manufacturing method comprising a laminated optical waveguide for optically coupling an optical element to an optical circuit board comprising an electric circuit board and an optical transmission path provided substantially parallel to the electric circuit board. And
As the first step,
Loading an uncured clad material on the light emitting / receiving surface side of the optical element or the opening of the electric circuit board;
Pressing the mold material into the uncured clad material, curing the clad material, and removing the mold material;
Loading the uncured core material into the recess formed in the cladding material by removing the mold material and curing it;
A layered waveguide is formed by a process including:
As the second step,
Loading an uncured cladding onto an already formed layered waveguide;
Pressing the mold material into the uncured clad material, curing the clad material, and removing the mold material;
Loading the uncured core material into the recess formed in the cladding material by removing the mold material and curing it;
A layered waveguide is formed by a process including:
Two or more layered waveguides are formed by repeating the second step one or more times. A method of manufacturing an optical coupler, comprising: An optical coupler manufacturing method comprising a laminated optical waveguide for optically coupling an optical element to an optical circuit board comprising an electric circuit board and an optical transmission path provided substantially parallel to the electric circuit board. And
As the first step,
Loading an uncured photocurable core material into the light emitting / receiving surface side of the optical element or the opening of the electric circuit board;
Irradiating light to a predetermined position of the core material and curing it to a predetermined core shape, and then removing an uncured portion of the core material;
Loading and curing the cladding material around the cured core material; and
A layered waveguide is formed by a process including:
As the second step,
Loading an uncured photocurable core material onto an already formed layered waveguide;
Irradiating light to a predetermined position of the core material and curing it to a predetermined core shape, and then removing an uncured portion of the core material;
Loading and curing the cladding material around the cured core material; and
A layered waveguide is formed by a process including:
Two or more layered waveguides are formed by repeating the second step one or more times. A method of manufacturing an optical coupler, comprising:

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