JP2011081299A - Optical coupling member and method of manufacturing optical coupling member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical coupling member in which the formation of an optical waveguide part is simplified, and to provide a method of manufacturing the optical coupling member. <P>SOLUTION: The upper face of a base member body 16 is formed as a core groove-forming face 19. A core groove 20, a pair of confinement walls 21, a core resin-dropping part 22 and a connecting groove 23 are formed on the core groove-forming face 19. The core resin-dropping part 22 and the connecting groove 23 are arranged and formed at the positions of the front side groove end part 24 of the core groove 20. The core resin-dropping part 22 is formed as a filling starting part of a core resin. The core resin-dropping part 22 is arranged and formed in the vicinity of the core groove 20. The connecting groove 23 is formed as a groove for connecting the core resin-dropping part 22 and the core groove 20 so as to allow the core resin to flow toward the core groove 20 side when the core resin flows from the core resin-dropping part 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical coupling member in which a core groove serving as a desired path is formed in a base material having a function as a clad, and a core resin is formed by filling the core groove with a core resin. Moreover, it is related with the manufacturing method of an optical coupling member.

  As an optical coupling between the light emitting / receiving element (optical element) and the optical fiber, light guide (confinement) by an optical coupling member having an optical waveguide is effective, and the optical waveguide portion has a function as a clad. The above-described forming method using a base material and filling a core resin into a core groove formed on the base material is simple and widely known. For filling the core resin, methods using drawing with a dispenser and pressing with an upper lid that also serves as a clad are known. However, the former requires high precision at the nozzle installation position of the dispenser (because the core width is narrow, In the latter case, when the upper lid is installed on the base material, a layer made of a core resin (a layer called a core layer or an intermediate layer) remains between the base material and the upper lid. Are deteriorated, and bubbles are mixed into the core.

  Although the following patent document discloses a technique related to the formation of an optical waveguide, there is a problem that a special process or a large-scale apparatus is required.

JP 2004-279831 A JP 2004-117585 A JP 2003-161851 A JP-A-11-52159

  This invention is made | formed in view of an above-described situation, and makes it a subject to provide the manufacturing method of the optical coupling member which can simplify formation of an optical waveguide part, and an optical coupling member.

  First, the characteristics relating to the optical coupling member will be described below.

  The optical coupling member of the present invention according to claim 1, which has been made to solve the above problems, forms a core groove serving as a desired path in a base material having a function as a cladding, and a core resin is formed in the core groove. In the optical coupling member formed by filling and forming the core, the core groove is formed in a shape in which the end of the groove is closed, and the core resin starts to be filled in the vicinity of the core groove and opens at a predetermined size. A concave core resin dropping portion is formed, and a connecting groove connected to the core groove is coupled to the core resin dropping portion.

  According to the present invention having such characteristics, the core resin is filled into the core groove by flowing the core resin from the core resin dropping portion in the formation of the core. The core resin in the core groove is filled with a uniform height. Filling the core resin at a uniform height does not create an intermediate layer between the core and the overcladding. Further, according to the present invention, even when the nozzle diameter of the dispenser is larger than the width of the core groove, the core resin can be filled by opening the core resin dropping portion in accordance with the nozzle diameter. By using the core resin dripping portion, drawing of the core resin by a dispenser becomes unnecessary. Furthermore, according to the present invention, since the core groove is formed with the groove end portion closed, it is not necessary to polish the end face of the optical waveguide composed of the core and the clad.

  The optical coupling member according to a second aspect of the present invention is the optical coupling member according to the first aspect, wherein a lens facing the end of the closed groove of the core groove is formed integrally with the base material. .

  According to the present invention having such a feature, it is possible to avoid an optical loss due to the formation positions of the core resin dropping portion and the connecting groove by integrally forming the lens and adjusting the condensing position.

  The optical coupling member of the present invention according to claim 3 is the optical coupling member according to claim 1 or 2, wherein the core groove is formed by subjecting the surface of the core groove to surface modification. And

  According to the present invention having such characteristics, the fluidity of the core resin is improved in connection with the formation of the core. By performing the surface modification, the contact angle between the core groove and the core resin is reduced, and the core resin can be filled without any unevenness in height due to mixing of bubbles and improving fluidity.

  In the optical coupling member according to claim 2, a ferrule guiding sleeve or an optical transceiver having an optical element is mounted so as to extend in a direction away from the core groove in accordance with the position of the lens. It is also preferable to form a mounting portion. According to such a feature, an optical coupling member in which one end side is an optical connection portion with the ferrule of the optical fiber terminal and the other end side is a mounting portion of the optical transceiver. Alternatively, both ends serve as an optical coupling member that is an optical connection portion with the ferrule. According to the characteristic here, there exists an effect that the optical coupling member suitable for the optical coupling between a light emitting / receiving element (optical element) and an optical fiber, or suitable for the optical coupling between optical fibers can be provided.

  In the optical coupling member according to any one of claims 1 to 3, it is also preferable that a confinement wall for an over clad material is formed so as to protrude from the core groove forming surface of the base material. According to such a feature, the over clad can be formed by applying a liquid agent. By applying the liquid agent, it is possible to make it difficult for voids to occur at the interface. According to the feature here, by forming the over clad by applying the liquid agent, it is possible to prevent the generation of voids at the interface. Thereby, there is an effect that deterioration of optical characteristics can be prevented.

  Next, characteristics relating to the method for manufacturing the optical coupling member will be described below.

  The method for producing an optical coupling member of the present invention according to claim 4, which has been made to solve the above-mentioned problems, is a substrate for forming a substrate having a core groove having a function as a clad and having a desired path. A material forming step, a core forming step for forming a core by filling the core groove with a core resin, and an over clad forming step for forming an over clad on the core after forming the core. In the method of manufacturing an optical coupling member, in the base material forming step, the core groove is formed in a shape in which the end of the groove is closed, becomes a filling start portion of the core resin in the vicinity of the core groove, and has a predetermined size. An open concave core resin dropping portion is formed, and the base material is formed such that a connecting groove connected to the core groove is formed in the core resin dropping portion. In the core forming step, the core Through the fat dripping section and the connection groove, characterized in that filling the core resin into the core grooves.

  According to the present invention having such characteristics, the core resin is filled into the core groove by flowing the core resin from the core resin dropping portion in connection with the formation of the core in the manufacture of the optical coupling member. The core resin in the core groove is filled with a uniform height.

  According to a fifth aspect of the present invention, there is provided the optical coupling member manufacturing method according to the fourth aspect, wherein, in the core forming step, the core resin is applied to the core while applying vibration to the base material. The groove is filled.

  According to the present invention having such characteristics, the fluidity of the core resin can be enhanced by applying vibration to the base material. The direction in which vibration is applied is preferably the optical axis direction (path length direction). Further, it is preferable that the vibration is applied when the core resin does not flow sufficiently.

  In addition, in the manufacturing method of the optical coupling member of Claim 4 or Claim 5, it is also suitable to surface-modify the surface of the said core groove | channel at the said base material formation process. According to the present invention having such a feature, the core resin in the core groove flows well by applying surface modification to the surface of the core groove. According to the present invention, the same effect as in the third aspect can be obtained.

  Moreover, in the manufacturing method of the optical coupling member according to claim 4 or claim 5, in the base material forming step, a confinement wall for an over clad material is formed to protrude on the core groove forming surface of the base material. In the over clad forming step, it is also preferable to apply the over clad material on the core in an amount that does not overflow from the confining wall. According to the present invention having such characteristics, the overcladding is formed by applying a liquid agent. According to the feature here, by forming the over clad by applying the liquid agent, it is possible to prevent the generation of voids at the interface. Thereby, there is an effect that deterioration of optical characteristics can be prevented.

  According to the first and fourth aspects of the present invention, high accuracy is not required at the nozzle installation position of the dispenser, generation of an intermediate layer between the core and the overcladding is suppressed, and the optical waveguide is formed from the core groove shape. Therefore, it is possible to simplify the formation of the optical waveguide portion as compared with the prior art. Moreover, according to this invention, there exists an effect that a special process and a large-scale apparatus can be made unnecessary. In addition, according to the present invention, it is possible to prevent the deterioration of the optical characteristics by suppressing the generation of the intermediate layer.

  According to the second aspect of the present invention, it is possible to provide an optical coupling member that does not cause an optical loss by optimizing the lens.

  According to the third aspect of the present invention, there is an effect that it is possible to provide an optical coupling member capable of suppressing the generation of bubbles. According to the present invention, it is possible to eliminate the need for a special process or a large-scale device in order to suppress the generation of bubbles.

  According to the present invention described in claim 5, the fluidity of the core resin can be enhanced. Therefore, there is an effect that the production of the optical coupling member can be improved.

It is a perspective view which shows the optical coupling member of this invention, the ferrule of an optical fiber terminal, and an optical transceiver. It is a perspective view of the base material which comprises the optical coupling member of FIG. It is a figure which concerns on a base material, (a) is a top view, (b) is the sectional view on the AA line of (a). It is process explanatory drawing which concerns on the manufacturing method of the optical coupling member of this invention, (a) is a figure of a base-material formation process, (b) is a figure of a core formation process, (c) is a figure of an over clad formation process. . It is explanatory drawing which concerns on a light ray, (a) is a figure which shows the mode of a ray tracing when light is incident on the core of an optical waveguide from a light emitting element, (b) is incident light on the core of an optical waveguide from an optical fiber. It is a figure which shows the mode of ray tracing at the time.

  A core resin dropping portion is formed in the vicinity of the core groove of the substrate having a function as a clad, and the core resin dropping portion and the core groove are connected by a connecting groove. Filling the core groove with the core resin is performed by flowing the core resin from the core resin dropping portion.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a perspective view showing an optical coupling member, a ferrule of an optical fiber terminal, and an optical transceiver according to the present invention. 2 is a perspective view of the base material, FIG. 3 is a plan view and a cross-sectional view of the base material, FIG. 4 is a process explanatory diagram relating to the method of manufacturing an optical coupling member of the present invention, and FIG. is there.

  In FIG. 1, reference numeral 1 denotes an optical coupling member of the present invention. The optical coupling member 1 is a member for optically coupling the optical fiber 2 and the optical transceiver 3, and is disposed between the optical fiber 2 and the optical transceiver 3. The optical coupling member 1 includes a base material 4 that functions as an under clad, a core 5 formed on the base material 4, and an over clad 6. The optical coupling member 1 has an optical waveguide 8 including a core 5 and a lens 7, and the optical fiber 2 and the optical transceiver 3 are optically coupled by the optical waveguide 8. Hereafter, each said structure is demonstrated and manufacture of the optical coupling member 1 is demonstrated after this. The arrows in FIG. 1 are defined as the vertical direction, the front-rear direction, and the left-right direction.

  A known optical fiber 2 is used. A ferrule 9 is provided at the end of the optical fiber 2. The ferrule 9 is formed with two annular flanges 10. A large diameter portion 11 having a large diameter is coupled to the flange 10 on the side close to the optical coupling member 1. The large diameter portion 11 is coupled to a small diameter portion 12 having a smaller diameter. Between the large-diameter portion 11 and the small-diameter portion 12, a step portion 13 that is generated due to a difference in diameter is formed. The small diameter portion 12 is formed as a portion inserted into the optical coupling member 1. The step portion 13 is formed so as to function as a stopper for the optical coupling member 1.

  The optical transceiver 3 has a package part 14 formed by packaging optical elements (light emitting elements and light receiving elements) (not shown), and a plurality of lead frames 15 extending from the package part 14. The optical transceiver 3 uses a known FOT (Fiber Optic Transceiver) in this embodiment. The package part 14 is formed in a rectangular substantially block shape. In the package part 14, in addition to the optical element, an optoelectronic component is mounted. The optical element is arranged according to the optical axis.

  1 to 3, the base 4 includes a base body 16, a sleeve 17 that is continuous with the front end of the base body 16, and a mounting portion 18 that is continuous with the rear end of the base body 16. Yes. The base material 4 is resin-molded so that the base body 16, the sleeve 17, and the mounting portion 18 are integrated. The base body 16, the sleeve 17, and the mounting portion 18 are arranged so as to be aligned in the optical axis direction (in the present embodiment, coincides with the front-rear direction). The base material 4 is required to have high precision moldability and high transmittance. For example, materials such as cycloolefin and acrylic are listed as candidate materials (refractive index than the resin material (core resin) used as the core 5). The resin material is selected so that desired optical characteristics can be obtained with respect to the refractive index difference).

  The base body 16 is formed in a substantially quadrangular prism shape. Moreover, it is formed to extend in the front-rear direction. The upper surface of the base body 16 is formed as a core groove forming surface 19. A core groove 20 and a pair of confinement walls 21 are formed on the core groove forming surface 19. A core resin dropping portion 22 and a connecting groove 23 are formed on the core groove forming surface 19. In addition, the side surface and lower surface other than the upper surface are formed as flat surfaces.

  In this embodiment, the core groove 20 is a groove that extends straight in the front-rear direction, and that extends along the optical axis, and is formed in a uniform groove shape that has a square shape in cross section. The core groove 20 is formed in a shape in which the groove end 24 is closed (see FIG. 3). The core groove 20 is formed in a groove shape that prevents the core resin from flowing out when the core resin is filled into the core groove 20. The dimension of the core groove 20 in the sectional view shape is set according to the diameter of the optical fiber 2 (the width and depth of the core groove 20 are matched with the diameter of the optical fiber 2). The core groove 20 is formed with improved hydrophilicity so that the side surface and the bottom surface can suppress the generation of bubbles due to the water repellent effect of the core resin. That is, it is formed so as to reduce the contact angle between the resins (between the core resin and the core groove 20).

  The pair of confinement walls 21 are formed so as to protrude upward from the left and right side portions of the core groove forming surface 19. One end of the pair of confinement walls 21 is coupled to the sleeve 17 and the other end is coupled to the mounting portion 18. The inside surrounded by the pair of confinement walls 21, the sleeve 17, and the mounting portion 18 is an over clad material (liquid agent). It is formed so that it can be confined (the over clad material is formed so as not to overflow).

  The core resin dropping portion 22 and the connecting groove 23 are arranged and formed at the position of the front groove end 24 in the core groove 20 (the arrangement is an example. For example, the core resin dropping section 22 and the connecting groove 23 are arranged at the position of the rear groove end 24. The arrangement is not particularly limited as long as it does not cause optical loss. The core resin dropping portion 22 and the connecting groove 23 are arranged and formed so as to extend in a direction orthogonal to the core groove 20 in the present embodiment.

  The core resin dripping portion 22 has a rectangular shape in plan view and a concave shape with a predetermined depth, and is formed as a core resin filling start portion. Moreover, the core resin dripping part 22 is formed so that it may open with the magnitude | size suitable for filling of core resin. In other words, it is formed so as to open with a size corresponding to the nozzle diameter of the dispenser. Such a core resin dropping part 22 is disposed and formed in the vicinity of the core groove 20. Core resin discharged from the dispenser accumulates in the core resin dripping portion 22, and the accumulated core resin flows into the connecting groove 23.

  The connecting groove 23 is a groove for connecting the core resin dropping portion 22 and the core groove 20, and is formed to have a groove shape having a cross section that is the same as or slightly smaller than the core groove 20. Yes. When the core resin from the core resin dropping part 22 flows, the connecting groove 23 can flow to the core groove 20 side.

  The sleeve 17 is a guide portion when the ferrule 9 is inserted, and is formed in a cylindrical shape. The end surface 25 of the sleeve 17 is formed as a portion with which the step portion 13 of the ferrule 9 abuts. The end face 25 is arranged so that the insertion amount of the ferrule 9 can be regulated (the end face 25 has a desired distance between the optical fiber 2 and the lens 7 (a good distance in optical coupling). ) Is arranged to be)). The lens 7 is disposed and formed in the back of the hole of the sleeve 17. The lens 7 is a convex lens and is disposed and formed so that the lens base end faces the groove end 24 on the front side of the core groove 20. The lens 7 is disposed and formed so that the central axis thereof coincides with the optical axis (the center of gravity axis of the groove cross section of the core groove 20). The sleeve 17 is formed so as to extend in a direction away from the core groove 20 in accordance with the position of the lens 7.

  The mounting portion 18 is formed as a portion for mounting the optical transceiver 3. The mounting portion 18 is formed in a shape that is substantially gate-shaped in rear view in accordance with the shape of the package portion 14 in the optical transceiver 3. A stop portion 26 for stopping the optical transceiver 3 at the time of mounting is formed inside the mounting portion 18. The lens 7 is disposed and formed in the back portion of the mounting portion 18. The lens 7 is a convex lens, and is arranged and formed so that the lens base end faces the rear groove end 24 in the core groove 20. The lens 7 is disposed and formed so that the central axis thereof coincides with the optical axis (the center of gravity axis of the groove cross section of the core groove 20). The mounting portion 18 is formed so as to extend in the above gate shape in accordance with the position of the lens 7 and in a direction away from the core groove 20. When the optical transceiver 3 is mounted on the mounting unit 18 (when the optical transceiver 3 is stopped by contacting the stopper 26), the distance from the lens 7 is set to a desired distance (a good distance in optical coupling). It has become. The mounting portion 18 is formed so that the plurality of lead frames 15 of the optical transceiver 3 extend from the lower side.

  The lens 7 and the core groove 20 of this embodiment are mirror-finished so that light scattering can be suppressed.

  The core 5 is formed by filling the core groove 20 with a core resin and curing it. The core 5 is required to be filtered so as to have a high fluidity, a high transmittance, a refractive index higher than that of the clad and a smooth surface after curing, such as UV curable epoxy and UV curable acrylic. The material shall be listed as a candidate material. The core resin is completely cured by light irradiation or heating immediately after filling the core groove 20.

  The over clad 6 is formed by confining an over clad material (liquid agent) inside a pair of confining walls 21, a sleeve 17, and a mounting portion 18. The over clad 6 is required to have fluidity and high transmittance. For example, materials such as UV curable epoxy and UV curable acrylic are listed as candidate materials. The over clad 6 is made of a resin material having a refractive index smaller than that of the core resin.

  In FIG. 1, the optical waveguide 8 includes a core 5, a cladding portion around the core 5, a lens 7, and a portion between the lens 7 and the groove end 24.

  Next, manufacturing (formation) of the optical coupling member 1 will be described based on the above configuration and structure. The optical coupling member 1 is manufactured (formed) by sequentially performing a base material forming step, a core forming step, and an overclad forming step.

  4A, in the base material forming step, the base material body 16 having the core groove 20, the pair of confining walls 21, the core resin dripping portion 22, and the connecting groove 23 on the core groove forming surface 19, and the base material. A base material 4 having a sleeve 17 continuing to the front end of the main body 16 and a mounting portion 18 continuing to the rear end of the base body 16 is formed by resin molding. In addition, the transparent molding material which concerns on resin molding is as above-mentioned.

  4B, in the core forming step, the core resin is filled into the core groove 20 through the core resin dropping portion 22 and the connecting groove 23 with the base material 4 placed on a flat surface. In addition, the discharge amount of the core resin is obtained by adding the amount obtained by multiplying the volume obtained from the width, depth, and length of all the grooves in advance by the density of the core resin and adding the cure shrinkage of the core resin. It shall be decided. Further, the discharge amount of the core resin is determined such that the core resin swells uniformly from the upper part of the core groove 20 in the optical axis direction (length direction) immediately after filling the core resin. The core resin is completely cured by light irradiation or heating, whereby the core 5 is formed.

  4C, when an over clad material (liquid agent) is applied to a predetermined position of the base material 4 (inside surrounded by the pair of confining walls 21, the sleeve 17, and the mounting portion 18) and cured, the over clad 6 is obtained. Is formed. At this time, the optical waveguide 8 is also formed. The amount of the over clad material applied is determined so that the core 5 is completely filled and does not overflow from the confinement wall 21.

  Thus, the manufacture (formation) of the optical coupling member 1 is completed. When the optical transceiver 3 is attached to the attachment portion 18 and the ferrule 9 of the optical fiber 2 terminal is inserted into the sleeve 17, the optical fiber 2 and the optical transceiver 3 are optically coupled by the optical coupling member 1.

  Regarding the optical coupling, it is easy to understand by referring to the explanatory diagram related to the light beam 27 shown in FIG. FIG. 5A shows a state of ray tracing when light is incident from the light emitting element 28 to the core 5 of the optical waveguide 8. FIG. 5B shows the state of ray tracing when light is incident on the core 5 of the optical waveguide 8 from the optical fiber 2. According to the present invention, although the core resin dripping portion 22 is formed in the vicinity of the core groove 20, the entire light ray 27 is condensed by the lens 7 (see FIG. 5). There is no connection.

  As described above with reference to FIGS. 1 to 5, according to the present invention, the core resin is caused to flow through the core resin dropping portion 22 and the connecting groove 23, thereby uniforming the core groove 20. The filling at the height can be performed without using a large-scale device such as a decompression device. Further, it is possible to prevent air bubbles from being mixed into the core 5 and the formation of an intermediate layer between the core 5 and the overcladding 6. Furthermore, since the over clad material which becomes a liquid agent is applied to form the over clad 6, the generation of voids at the interface can be made difficult to occur.

  According to the present invention, when the nozzle diameter d of the dispenser (the nozzle diameter is d and the width of the core groove 20 (core groove width) is D) is larger than the core groove width D (d> D), the nozzle tip When the installation accuracy is larger than [D−d] / 2, the core resin can be filled without any problem by sufficiently securing the size of the core resin dropping portion 22. In addition, since there is no need for drawing with a dispenser to form the core 5, the core 5 can be easily formed.

  Further, according to the present invention, even if the core resin dropping portion 22 and the connecting groove 23 are formed by integrating the lens 7 with the base material 4 and optimizing the lens 7, the optical loss can be achieved. And the occurrence of deterioration of optical characteristics can be prevented.

  Further, according to the present invention, since the groove end portion 24 of the core groove 20 is closed, it is possible to achieve a structure that does not require end face polishing. Thereby, workability | operativity can be improved.

  The present invention relates to the formation of the portion of the optical waveguide 8, and is an optical coupling member 1 and a method for manufacturing the optical coupling member 1 that can be greatly simplified as compared with the conventional art.

  Here, the points to be noted for sufficiently flowing the core resin will be described. The points to be noted are the following (1) to (3).

  (1) The wettability between the substrate 4 and the core resin is assumed to be good. When the contact angle of both materials is large, surface modification such as corona discharge or plasma discharge is performed to reduce the contact angle. In the plasma discharge, the effects shown in Table 1 below can be obtained, and the core resin can be filled without unevenness in height due to mixing of bubbles and improvement in fluidity.

  (2) The smoothness of the groove surface in the core groove 20 is increased. This is because if the smoothness of the core groove 20 is not ensured, the propagation loss of the optical waveguide 8 may increase.

  (3) The cleanliness of the core groove 20 is sufficiently increased.

  In the improvement of wettability between the base material 4 and the core resin by the above surface modification, the wettability with the core resin can be maintained by selectively treating only the portion of the core groove 20, The outflow of the core resin from the core groove 20 can be suppressed by the water repellent effect. In addition, when the core resin does not flow sufficiently, the fluidity can be enhanced by applying vibration in the optical axis direction (path length direction) to the base material 4.

  It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

  The optical coupling member 1 of the present invention is applicable to one configuration of an optical connector or a hybrid connector (having the functions of an optical connector and an electrical connector).

  The over clad 6 is not limited to the above example, and may be fixed by heating using a laminate film (to be in close contact with the core 5).

  Regarding the lens 7, a non-reflective coating may be applied to the lens surface to suppress Fresnel reflection at the interface (the optical coupling efficiency can be improved).

DESCRIPTION OF SYMBOLS 1 ... Optical coupling member 2 ... Optical fiber 3 ... Optical transceiver 4 ... Base material 5 ... Core 6 ... Over clad 7 ... Lens 8 ... Optical waveguide 9 ... Ferrule 10 ... Flange 11 ... Large diameter part 12 ... Small diameter part 13 ... Step part DESCRIPTION OF SYMBOLS 14 ... Package part 15 ... Lead frame 16 ... Base material body 17 ... Sleeve 18 ... Mounting part 19 ... Core groove formation surface 20 ... Core groove 21 ... Containment wall 22 ... Core resin dripping part 23 ... Connection groove 24 ... Groove edge part 25 ... End face 26 ... Stop part 27 ... Light beam 28 ... Light emitting element

Claims (5)

In the optical coupling member formed by forming a core groove serving as a desired path in the base material having a function as a clad and filling the core groove with a core resin to form a core,
The core groove is formed in such a shape that the groove end portion is closed, and a concave core resin dropping portion that is a filling start portion of the core resin and opens at a predetermined size is formed in the vicinity of the core groove. An optical coupling member comprising: a coupling groove coupled to the core groove at the core resin dropping portion. The optical coupling member according to claim 1,
The optical coupling member, wherein a lens facing the end of the closed groove of the core groove is formed integrally with the base material. In the optical coupling member according to claim 1 or 2,
The optical coupling member, wherein the core groove is formed by subjecting the surface of the core groove to surface modification. A base material forming step for forming a base material having a function as a clad and having a core groove serving as a desired path; and a core forming step for forming a core by filling the core groove with a core resin; An over clad forming step of forming an over clad on the core after forming the core, and a method of manufacturing an optical coupling member,
In the base material forming step, the core groove is formed in a shape in which the end of the groove is closed, and a concave core resin dropping portion that becomes a filling start portion of the core resin in the vicinity of the core groove and opens at a predetermined size. And further forming the base material in such a manner that the core resin dropping portion is connected to a connecting groove connected to the core groove,
In the core forming step, the core resin is filled into the core groove through the core resin dropping portion and the connecting groove. In the manufacturing method of the optical coupling member of Claim 4,
In the core forming step, the core resin is filled into the core groove while applying vibration to the base material.

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