JP2017032695A - Photoelectric composite module and transmission apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opto-electric composite module having a compact size, a large capacity and a high density. An optical-electric composite module 1 includes an optical element 12 provided with an input or output unit of light, an optical waveguide 14 connecting the optical element 12 with the input or output unit of light, and the optical element 12 and electricity. The optical element 12 and the optical waveguide 14 are provided with an optical transmission / reception circuit element 13 to be specifically connected to the optical transmission / reception circuit element 13 and a circuit board 11 on which the optical element 12 and the optical transmission / reception circuit element 13 are mounted. The optical axis of the light on the output unit side or the optical waveguide 14 is optically connected via the optical axis direction conversion unit 17 that tilts the optical axis of the light on the optical element 12 side. [Selection diagram] FIG. 1A

Description

  The present invention relates to an optical coupling structure of an optical element and an optical waveguide, and more particularly to an optoelectric composite module that collectively processes a large-capacity optical signal and a transmission device using the same.

2. Description of the Related Art In recent years, communication traffic using optical signals has been rapidly developed in the information and communication field, and optical fiber networks have been deployed over long distances of several kilometers or more such as trunk, metro, and access systems. In the future, between transmission devices (several meters to several hundreds of meters), within devices (several centimeters
It is effective to use optical signals in order to process large volumes of data without delay even at short distances (several tens of centimeters), and optical transmission between LSIs or LSI-backplanes in information equipment such as routers and servers is effective. It is being advanced.

  When constructing a transmission apparatus using optical signals, what is important is how to easily and efficiently transmit an optical signal converted from electricity to light. It is important to efficiently propagate an optical signal from the light emitting element to an optical wiring such as an optical fiber or an optical waveguide, or to efficiently enter an optical signal propagated from the optical transmission path to the light receiving element. In general, in order to improve the optical coupling efficiency between the optical element and the optical transmission line, it is necessary to align the optical element and the optical transmission line with high precision. In consideration, it is also important to have a structure in which a large number of optical elements are aligned together.

  For example, in Japanese Patent Application Laid-Open No. 2006-267502 (Patent Document 1), an optical waveguide substrate which is an optical wiring is arranged in a direction perpendicular to a submount substrate and is collectively applied to a one-dimensional optical element array on the substrate. Thus, the structure can perform optical coupling.

JP 2006-267502 A

  However, the above-described conventional technique has the following problems. Since the optical waveguide substrate is installed perpendicular to the submount substrate, the optical waveguide substrate cannot be flexible in the direction parallel to the submount substrate. That is, the position of the end of the optical waveguide cannot be freely arranged. For the same reason, there is a limit to reducing the height of the optical composite wiring module.

  Next-generation information devices require large capacity and high density in order to process a large amount of information, but the opto-electric composite modules applied to them will have large capacity and high density in a compact size. Realization is desired.

  In addition, information devices may be configured by incorporating a large number of photoelectric composite modules. At this time, in order to make the entire device compact, the thickness (height) of each photoelectric composite module must be set. It is necessary to make it as small as possible (low profile). For this purpose, the optical waveguide used in the optoelectronic composite module should be structured so that it can be routed as close to the surface of the optoelectronic composite module substrate as possible (in parallel to the surface of the substrate). Desired.

  The present invention solves the above-mentioned problems of the prior art, and provides a photoelectric composite module and a transmission device using the same, which can realize a large capacity and high density in a compact size. is there.

An example of the configuration of the present invention for solving the above problems is as follows.
An optical element including an optical input unit or an output unit; an optical waveguide optically connected to the optical element at the optical input unit or output unit; and an optical transceiver circuit element electrically connected to the optical element; And a circuit board on which the optical element and the optical transceiver circuit element are mounted, wherein the optical element and the outer optical waveguide are connected to the light input portion or the output portion of the optical element. Or an optical-electrical module characterized in that it is optically connected via an optical axis direction conversion section that inclines the optical axis of light on the optical element side from the optical waveguide.

  Further configurations and effects of the present invention will become apparent from the following description.

  According to the present invention, since the height of the photoelectric composite module can be reduced while ensuring high optical coupling efficiency, the photoelectric composite module can be reduced in size and height.

  Further effects of the present invention will become apparent from the entire description of the present application based on the description of the embodiments below.

It is sectional drawing of the photoelectric composite module which shows the schematic structure of the photoelectric composite module in Example 1 of this invention. It is sectional drawing to which the connection part of the optical element and optical waveguide of the photoelectric composite module in Example 1 of this invention was expanded. It is a graph which shows the relationship between the positional offset amount of the light emission point and the center axis | shaft of a lens when the focal distance of a lens is changed, and the inclination of the optical axis of the light beam radiate | emitted from a lens at that time. It is sectional drawing of the photoelectric composite module which shows the schematic structure of the photoelectric composite module in Example 2 of this invention. It is sectional drawing to which the connection part of the optical element and optical waveguide of the photoelectric composite module in Example 2 of this invention was expanded. It is sectional drawing of the photoelectric composite module which shows the schematic structure of the photoelectric composite module in Example 3 of this invention. It is sectional drawing to which the connection part of the optical element and optical waveguide of the photoelectric composite module in Example 3 of this invention was expanded. It is sectional drawing to which the connection part of the optical element and optical waveguide of the photoelectric composite module in the modification of Example 3 of this invention was expanded. It is sectional drawing of the photoelectric composite module which shows the schematic structure of the photoelectric composite module in Example 4 of this invention. It is sectional drawing to which the connection part of the optical element and optical waveguide of the photoelectric composite module in Example 4 of this invention was expanded. It is sectional drawing of the photoelectric composite module which shows the schematic structure of the photoelectric composite module in Example 5 of this invention. It is sectional drawing to which the connection part of the optical element and optical waveguide of the photoelectric composite module in Example 5 of this invention was expanded. It is sectional drawing of the transmission apparatus which shows the schematic structure of the transmission apparatus in Example 6 of this invention.

  The present invention includes an optical waveguide having a core curved in the vicinity of an optical coupling portion, and an optical element optically coupled to the optical waveguide, the optical axis of the core curved in the direction of light emitted from or incident on the optical element This is an optoelectric composite module characterized by an optical waveguide coupling structure provided with an optical axis direction conversion structure that is substantially in the same direction as the above.

  The present invention makes it possible to reduce the size and height of a photoelectric composite module while ensuring high optical coupling efficiency in an optical waveguide coupling structure. In order to obtain high coupling efficiency in the optical waveguide coupling structure, it is important to arrange the optical waveguide in parallel with the light incident / exit direction of the optical element. On the other hand, in order to reduce the height of the photoelectric composite module, it is important to arrange the optical waveguide parallel to the incident / exit surface of the optical element.

In the present invention, in order to satisfy these two requirements, an optical element is formed by shifting the optical axis direction conversion structure having a circular or elliptical cross section formed of a material having a high refractive index with respect to the light emitting and receiving point. The incident / outgoing direction of the optical waveguide is inclined, and the end face of the optical waveguide is arranged in the inclined direction so as to ensure the parallelism of the incoming / outgoing light and the optical waveguide. Further, since the end face of the optical waveguide can be tilted rather than perpendicular to the optical element installation surface, the optical waveguide is required to be arranged in parallel to the incident / exit surface of the optical element. The height of the photoelectric module can be reduced, and the height of the photoelectric composite module can be reduced.
Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1A and FIG. 1B show a first embodiment of the present invention. FIG. 1A is a cross-sectional view of the photoelectric composite module 1 according to this embodiment. FIG. 1B is an enlarged view of the optical coupling portion between the optical element and the optical waveguide.

  The photoelectric composite module 1 according to this embodiment includes a substrate 11, an optical element 12, an optical transceiver circuit element 13, and an optical waveguide 14. An optical element 12 such as a semiconductor laser or a photodiode and an optical transmission / reception circuit element 13 for the optical element 12 are mounted on the substrate 11. In the present embodiment, the mounting method is flip-chip mounting for both the optical element 12 and the optical transceiver circuit element 13. The optical element 12 and the optical transmission / reception circuit element 13 are electrically connected to each other by the solder bump 15 and the electric wiring 16 formed on the first substrate 11.

  When a semiconductor laser is used as the optical element 12, an electric signal is transmitted from the optical transmission circuit element 13 to the semiconductor laser that is the optical element 12 through the electric wiring 15, and is converted from an electric signal to an optical signal by the semiconductor laser. On the other hand, when a light receiving element is used as the optical element 12, an optical signal incident on the light receiving element from the optical waveguide 14 is photoelectrically converted into an electric signal by the light receiving element and output from the light receiving element. An electrical signal is sent to the transmission circuit element 13. In this embodiment, the optical element 12 is an optical element array having a plurality of incident / incident points. In this embodiment, a 2 × 12 channel matrix optical element array is applied.

  Regarding the mounting method, both the optical element 12 and the optical transmission / reception circuit element 13 may be a combination of die bonding and wire bonding other than flip-chip mounting. The array shape may be a one-dimensional array such as a 1 × 12 channel or a single-channel optical element, but the effect of the present invention is a matrix (N × M, N ≧ 2, M ≧ 2) array. It is especially demonstrated in the element.

  When a light emitting element such as a semiconductor laser is used as the optical element 12, an electrical signal that is a source of an optical signal emitted from the light emitting element is propagated from the substrate 11 to the light emitting element mounted above the substrate 11. . When a light receiving element is used as the optical element, an optical signal incident on the light receiving element is propagated from above the substrate 11 into the substrate 11. An optical signal enters and exits perpendicularly to the optical element 12 installation surface of the substrate 11. An optical waveguide 14 is installed above the optical element 12.

  As shown in FIG. 1B, the optical waveguide 14 is configured with a core 141 having a relatively high refractive index and its periphery covered with a clad 142 having a refractive index lower than that of the core. The optical signal has a structure in which it is confined in the core 141 due to the difference in refractive index between the core 141 and the clad 142 and propagates. The optical waveguide 14 is formed by integrating the core 141 and the clad 142.

  The optical waveguide 14 in this embodiment is characterized in that the vicinity of the end 143 of the core 141 is curved. The curved structure of the end portion 143 of the core 141 has a shape that becomes parallel to the optical element 12 installation surface of the substrate 11 as the distance from the optical element 12 increases. The optical waveguide film 144 composed mainly of the material forming the clad 142 is made thin so that it can be bent.

  An optical axis direction conversion structure 17 is provided between the optical element 12 and the end portion 143 of the optical waveguide 14. In the present embodiment, as the optical axis direction conversion structure 17, an optical axis direction conversion structure 17 having a spherical shape with a circular or elliptical cross section by a member having a higher refractive index than the surrounding material is used. In the present embodiment, the optical waveguide cladding 142 is used as the surrounding material, and the same material as the optical waveguide core 141 is used for the spherical optical axis direction conversion structure 17.

  The spherical optical axis direction conversion structure 17 with respect to the center position of the light exit / incident point 121 of the optical element 12 is installed with the center axis 171 shifted on the surface of the optical element 12. The spherical optical axis direction conversion structure 17 functions as a lens. When the central axis of the lens is arranged so as to be shifted with respect to the optical axis of the light beam 123 propagating through the lens, the optical axis 122 of the light beam 123 emitted from the lens is relative to the optical axis of the light beam 123 incident on the lens. Tilt according to the curvature of the lens.

  FIG. 2 shows a calculation result indicating the correlation between the lens position shift amount and the inclination of the optical axis. For example, when the focal length of the lens is 0.1 mm (100 μm), if the optical axis of the incident light beam 123 is shifted by 30 μm from the center of the lens, the incident light beam is parallel to the optical axis of the lens. 123 emits with an inclination of 17 ° with respect to the optical axis of the lens.

  A mode in which the optical element 12 and the optical waveguide 14 are optically coupled will be described with reference to FIG. 1B, taking a light emitting element as the optical element 12 and the emitted light emitted from the optical element 12 as an example.

  First, when a light emitting element such as a semiconductor laser is used as the optical element 12, the light beam 123 emitted from the light incident / exit point 121 of the light emitting element 12 is emitted in a direction perpendicular to the surface of the light emitting element 12. The light beam 123 emitted from the light emitting element 12 in the vertical direction passes through the spherical-shaped optical axis direction conversion structure 17 ahead of the light emitting element 12, but the light is incident on the central axis 122 of the light incident / incident point 121 of the light emitting element 12 and spherical light. Since the central axis 171 of the axial direction conversion structure 17 is arranged with its position shifted with respect to the normal direction of the surface of the light emitting element 12, the light of the light beam 123 that has passed through the spherical optical axis direction conversion structure 17. The axis is inclined in the direction of the core 141 of the optical waveguide 14 with respect to the normal direction of the surface of the light emitting element 12. The core end portion 143 of the optical waveguide 14 having a curved tip is installed in the traveling direction of the light beam 123 emitted from the spherical optical axis direction conversion structure 17.

  The core end portion 143 of the optical waveguide 14 passes through the spherical optical axis direction conversion structure 17 and is emitted in a direction inclined in the direction of the core 141 of the optical waveguide 14 with respect to the normal direction of the surface of the light emitting element 12. The beam 123 is disposed along the position where the beam 123 enters in parallel, that is, along the traveling direction of the light beam 123 that has passed through the spherical optical axis direction conversion structure 17. By arranging the core end portion 143 of the optical waveguide 14 in this way, the light beam 123 that has exited from the incident / exit point 121 of the light emitting element 12 and passed through the spherical optical axis direction conversion structure 17 is Incident parallel to the core 141. Thereby, an optical signal can be efficiently propagated to the optical waveguide. The optical signal incident on the optical waveguide 14 propagates along the core 141 of the optical waveguide 14 to the optical connector 26 side.

  The light beam 123 incident on the optical waveguide 14 is incident on the surface of the light-emitting element 12, that is, the surface of the substrate 11, by the core 141 formed by bending the tip portion of the optical waveguide 14 and the tip thereof being parallel to the surface of the light-emitting element 12 Is transmitted in a parallel direction.

  Here, the light beam 123 emitted in the direction perpendicular to the incident / exit point 121 of the light emitting element 12 without using the spherical optical axis direction conversion structure 17 is perpendicular to the incident / exit point 121 of the light emitting element 12. The light beam 123 emitted from the incident / exit point 121 of the light emitting element 12 is also made parallel to the surface of the light emitting element 12, that is, the surface of the substrate 11. Can be sent in the direction. However, in this case, the height sent in the direction parallel to the surface of the substrate 11 needs to be a height corresponding to the minimum allowable radius of curvature of the optical waveguide 14, and the optoelectronic composite module 1 is configured to be compact. The object of the invention cannot be achieved.

  On the other hand, in the system using the spherical optical axis direction conversion structure 17 according to the present embodiment, the light beam 123 emitted in the direction perpendicular to the incident / exit point 121 of the light emitting element 12 is converted into the spherical optical axis direction conversion. By passing through the structure 17, the optical axis of the light beam 123 is inclined in the direction of the core 141 of the optical waveguide 14 with respect to the direction perpendicular to the incident / exit point 121, and is incident on the core 141. The height from the surface of the substrate 11 required to transmit the light beam 123 in a direction parallel to the surface of the light emitting element 12, that is, the surface of the substrate 11 is sufficient as compared with the case where the spherical optical axis direction conversion structure 17 described above is used. It becomes possible to make it small.

  When a light receiving element is used as the optical element 12 instead of the light emitting element, light propagation in the opposite direction occurs.

  In the configuration shown in FIG. 1B, the spherical optical axis direction conversion structure 17 and the tip 143 of the core 141 of the optical waveguide 14 are not in contact with each other, and the clad material 142 exists between them. The tip 143 of the core 141 may be in contact with the spherical optical axis direction conversion structure 17 or included in the spherical optical axis direction conversion structure 17.

  As a method of forming the spherical optical axis direction conversion structure 17 and the core 141 of the optical waveguide 14, a method of injecting a high refractive index material into the clad material before curing using a needle may be employed. By using this method, the spherical optical axis direction conversion structure 17 and the bent optical waveguide 14 can easily provide a desired shape by controlling the discharge amount of the resin material and the needle position. Of course, another method using photolithography or the like may be used as a manufacturing method.

  In this embodiment, an optical axis direction conversion structure in which the position of the central axis of a spherical optical axis direction conversion structure formed of a high refractive index material is shifted from the center position of the light receiving and emitting points of the optical element is used. Thus, the optical waveguide having the core curved in the vicinity of the optical coupling portion and the optical element are optically coupled.

  As a result, according to the present embodiment, the end face of the optical waveguide can be inclined rather than perpendicular to the optical element installation surface, so that the optical waveguide is arranged in parallel to the incident / exit surface of the optical element. The height of the required optical element from the incident / exit surface can be kept low, and the height of the photoelectric composite module can be reduced.

  Further, according to the present embodiment, the optical waveguide direction conversion structure in which the optical waveguide serving as a path of light emitted from the optical element or incident on the optical element is substantially in the same direction as the optical axis of the core curved in the direction of the optical element. It is possible to provide an optoelectric composite module including an optical waveguide coupling structure having the following.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 3A and 3B. The relationship between FIGS. 3A and 3B is the same as the relationship between FIGS. 1A and 1B described in the first embodiment.

  The difference of the present embodiment from the first embodiment is that an optical axis direction conversion structure 217 is formed on the light incident / incident part of the optical element 12 as shown in FIG. 3A. In this embodiment, a high refractive index resin (for example, an acrylic resin, an epoxy resin, or the like) that forms the optical axis direction conversion structure 217 is dropped on the light incident / incident point 121 of the optical element 12 to thereby change the optical axis direction. A conversion structure 217 is formed. As a result, the shape of the resin forming the dropped optical axis direction conversion structure 217 has a semispherical shape with a semicircular or elliptical cross section as shown in FIG. 3B.

  The hemispherical optical axis direction conversion structure 217 is similar to the spherical optical axis direction conversion structure 17 described in the first embodiment in the position of the light incident / incident point 121 of the optical element 12 (the incident / incident point). 121 is formed by shifting the position of the central axis 271 with respect to the optical axis direction of the light beam emitted from the hemispherical optical axis direction conversion structure 217 or the optical path of the incident light. The effect of inclining in the direction of the core 241 of the waveguide 214 is obtained.

  Above the hemispherical optical axis direction conversion structure 217, a core tip portion 243 of the optical waveguide 214 is disposed in parallel to the optical axis direction of the light emitted from the optical axis direction conversion structure 217. The optical waveguide 214 is formed by covering the optical waveguide core 241 with the clad 242 and has a structure that allows the optical element 12 and the optical waveguide 214 to be optically coupled.

  The optical element 12 on which the hemispherical optical axis direction conversion structure 217 is formed and the optical waveguide 214 are fixed by an adhesive 251.

  In the description of the present embodiment, the example in which the hemispherical optical axis direction conversion structure 217 is formed on the light incident / incident point 121 of the optical element 12 is described. However, the hemispherical optical axis direction conversion structure 217 is light-guided. You may make it form in the core front-end | tip part 243 of the waveguide 214. FIG.

  In this embodiment, an optical waveguide having a core curved in the vicinity of the optical coupling portion and an optical element, the center axis of the hemispherical optical axis direction conversion structure being shifted from the central position of the light emitting and receiving point Can be photocoupled.

  As a result, according to the present embodiment, the end face of the optical waveguide can be inclined rather than perpendicular to the optical element installation surface, so that the optical waveguide is arranged in parallel to the incident / exit surface of the optical element. The height of the required optical element from the incident / exit surface can be kept low, and the height of the photoelectric composite module can be reduced.

  Further, according to the present embodiment, the optical waveguide coupling structure having the hemispherical optical axis direction conversion structure in which the direction of the light emitted from or incident on the optical element is substantially the same as the optical axis of the curved core It is possible to provide a photoelectric composite module including

  Next, a third embodiment of the present invention will be described with reference to FIG. The relationship between FIGS. 4A and 4B is the same as the relationship between FIGS. 1A and 1B described in the first embodiment.

  A feature of this embodiment is that a mirror structure 318 is used as the optical axis direction conversion structure in addition to the spherical structure 371 formed of the high refractive index resin described in the second embodiment. Further, unlike the other embodiments, the direction in which the light beam 123 is inclined by the spherical structure 317 is inclined in the direction opposite to the direction in which the tip of the optical waveguide core exists.

  The configuration of this example will be described in the case of using the light emitting element 12 as the optical element 12 in the form of optical coupling. First, a light beam is emitted from the light incident / incident point 121 of the light emitting element 12 and is incident on a spherical optical axis direction conversion structure 317 formed on the light incident / incident point 121. The light beam 123 that has entered the spherical optical axis direction conversion structure 317 has a spherical shape because the central axis 371 of the spherical optical axis direction conversion structure 317 is shifted to the left from the center 122 of the light incident / incident point 121. When the light is emitted from the optical axis direction conversion structure 317 having a shape, the light is emitted while being inclined in the direction in which the mirror 318 exists.

  Next, the light beam 123 emitted from the spherical optical axis direction conversion structure 317 is reflected by the mirror 18 surface to change the traveling direction of the light beam 123. By disposing the tip 343 of the optical waveguide core 314 in parallel with the light beam 123 before the traveling direction is changed, an optical signal can propagate to the optical waveguide 314 with high coupling efficiency.

  The optical element 12 on which the hemispherical optical axis direction conversion structure 317 is formed and the optical waveguide 314 are fixed with an adhesive 351.

  As an example of a method for forming the mirror 18, the clad material 342 is formed by a method using dicing, a method using laser processing, or the like, and a chromium (Cr) film or the like is formed on the reflecting surface to form the mirror 18.

  According to the present embodiment, since the end face of the optical waveguide can be inclined rather than perpendicular to the optical element installation surface, the optical element required for arranging the optical waveguide in parallel with the incident / exit surface of the optical element The height from the incident / exit surface can be kept low, and the height of the photoelectric composite module can be reduced.

  As a modification of the present embodiment, by appropriately setting the refraction angle of the light beam 123 by the spherical optical axis direction conversion structure 317 and the reflection angle of the mirror structure 318, as shown in FIG. The traveling direction of the light beam 123 reflected by the mirrors 381 and 382 formed on the cladding 362 of 360 can be made parallel to the surface of the light emitting element 12, and the linear shape can be obtained without bending the tip 363 of the core 361 of the optical waveguide 360. Can be molded.

  According to this modification, since the end face of the optical waveguide can be formed in parallel to the optical element installation surface, the height from the input / output surface of the optical element to the core end face of the optical waveguide can be kept low. The height of the photoelectric composite module can be reduced.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. The relationship between FIGS. 5A and 5B is the same as the relationship between FIGS. 1A and 1B.

  The feature of the present embodiment is that the light beam propagation path is below the optical element 412. That is, the optical waveguide 414 is disposed below the optical element 412. In this embodiment, the optical waveguide film 414 is mounted on a substrate 411, an electrode 419 is formed on the optical waveguide film 414, and the optical element 412 is flip-chip mounted thereon. The structure of the optical waveguide film 414 is the same as that of the first embodiment, and includes an optical waveguide core 441 having a curved tip 443 and a spherical optical axis direction conversion structure 417 made of a resin having a high refractive index with respect to the cladding 442. ing.

  The optical element 412 is disposed such that the optical axis center 422 of the light beam 123 emitted from the light emitting / receiving point 421 and the central axis 471 of the spherical optical axis direction conversion structure 417 are displaced. With this structure, the light beam 123 that has passed through the spherical optical axis direction conversion structure 417 is refracted and tilted. The form of light propagation is the same as that described in the first embodiment except that the direction is different.

  According to the present embodiment, in the configuration in which the light incident / exit point is arranged on the lower side of the optical element, the end face of the optical waveguide can be inclined rather than perpendicular to the optical element installation surface. The height from the entrance / exit surface of the optical element required until the optical waveguide is arranged in parallel to the exit surface can be kept low and placed below the optical element. Without this, the height of the photoelectric composite module can be reduced.

  Next, a fifth embodiment according to the present invention will be described with reference to FIG. The relationship between FIGS. 6A and 6B is the same as the relationship between FIGS. 1A and 1B.

  The present embodiment is similar to the fourth embodiment in that the light beam propagation path is on the lower side of the optical element. It is characterized in that the position of the optical axis direction conversion structure 517 made of high refractive index resin is different. The optical axis direction conversion structure 517 formed of a high refractive index resin is installed on the upper surface of the optical waveguide film 514 so as to drop a resin similar to that described in the second embodiment.

  As a result, the surface of the optical axis direction conversion structure 517 made of a high refractive index resin is hemispherical as in the second embodiment. The optical axis direction conversion structure 517 made of this hemispherical high refractive index resin causes the light beam 123 emitted from the light receiving / emitting point 421 of the optical element 412 to be inclined, and the core of the optical waveguide 514 in which the tip 543 is curved. Light can be efficiently propagated to 541.

  According to the present embodiment, in the configuration in which the light incident / exit point is arranged on the lower side of the optical element, the end face of the optical waveguide can be inclined rather than perpendicular to the optical element installation surface. The height from the entrance / exit surface of the optical element required until the optical waveguide is arranged in parallel to the exit surface can be kept low and placed below the optical element. Without this, the height of the photoelectric composite module can be reduced.

  Next, a configuration in which the photoelectric composite module 1 according to the present invention is applied to the transmission apparatus 100 will be described with reference to FIG.

  In FIG. 7, the transmission device 100 is formed by mounting the photoelectric composite module 1 and an electronic component (IC 22) on a second substrate 21. The photoelectric composite module 1 is mounted on the second substrate 21 of the transmission device 100 by solder bumps 25. Similarly, an IC 22 such as a switch LSI is mounted on the second substrate 21 by solder bumps 25.

  The IC 22 is electrically connected to the optical transmission / reception circuit element 13 mounted on the photoelectric composite module 1 via the electrical wiring 23 provided on the second substrate 21. That is, in the transmission apparatus 100, an electrical signal from the IC 22 is transmitted to the optical transmission circuit 13, and further, the electrical signal is transmitted from the optical transmission circuit 13 to the optical element (light emitting element) 12 and converted into an optical signal, and then the optical waveguide. 14 is transmitted through the optical signal. Alternatively, the optical signal propagating through the optical waveguide 14 is converted into an electric signal by the optical element (light receiving element) 12, and reaches the IC 32 through the optical transmission / reception circuit 13. An optical connector 26 is provided at the end of the optical waveguide 14. By connecting another optical waveguide (optical fiber) or the like to this end, optical transmission between boards or racks is possible.

  Although the photoelectric composite module 1 uses the form of Example 1, any form of Examples 2 to 5 other than this may be used. The mounting form of the photoelectric composite module 1 or the IC 22 on the second substrate 21 may also be an electrical socket other than solder.

  According to the present embodiment, the end face of the optical waveguide is tilted rather than perpendicular to the optical element installation surface, and the optical element entrance / exit plane required for placing the optical waveguide in parallel with the optical element entrance / exit plane By using an opto-electric composite module that keeps the height of the transmission device low, the overall thickness of the transmission device can be made relatively thin.

  DESCRIPTION OF SYMBOLS 1 ... Photoelectric composite module 11 ... Board | substrate 12 ... Optical element 13 ... Optical transmission / reception circuit element 14 ... Optical waveguide 15 ... Solder bump 16 ... Electric wiring 17 ... Light Axial direction conversion structure (spherical shape, hemispherical shape) 18 ... mirror 19 ... electrode 21 ... second substrate 22 ... IC 23 ... electrical wiring 24 ... electrode 25 ... Solder bump 26 ... Optical connector 100 ... Transmission device 121 ... Optical element exit point / incident point 141 ... Optical waveguide core 142 ... Optical waveguide clad 143 ... End of optical waveguide core 144... Optical waveguide film 171... Center axis of spherical shape and hemispherical shape

Claims (15)

An optical element having an input part or an output part of light;
An optical waveguide optically connected to the optical element at the input or output part of the light, and an optical transmission / reception circuit element electrically connected to the optical element;
A circuit board on which the optical element and the optical transceiver circuit element are mounted;
A photoelectric composite module comprising:
The optical element and the optical waveguide include an optical axis direction conversion unit that tilts an optical axis of light of the light input part or output part of the optical element, or an optical axis of light on the optical element side from the optical waveguide. An optical / electrical composite module characterized in that it is optically connected.   2. The photoelectric composite module according to claim 1, wherein the optical waveguide includes a core having a relatively high refractive index and a periphery of the core covered with a clad having a relatively low refractive index. A portion extending linearly in parallel with the surface on which the light input portion or output portion of the element is formed, and at the end of the core on the optical axis direction conversion portion side, on the side of the optical axis direction conversion portion The photoelectric composite module is characterized by being curved in a curved line.   2. The photoelectric composite module according to claim 1, wherein the optical axis direction conversion portion is formed in a spherical shape or an elliptical shape with the same material as the clad. 3.   2. The photoelectric composite module according to claim 1, wherein the optical axis direction conversion unit is formed in a hemispherical shape on a surface of the optical element that transmits or receives light. .   3. The photoelectric composite module according to claim 2, wherein the optical axis direction converting portion is hemispherically formed on an end surface of the optical waveguide that is curved toward the optical axis direction converting portion. A photoelectric composite module characterized by comprising:   2. The photoelectric composite module according to claim 1, wherein the optical axis direction conversion unit has a reflection surface, and the light on the optical element side or the light on the optical waveguide side is reflected on the reflection surface. An optical / electrical composite module characterized in that the optical axis of the light on the side or the optical axis of the light on the optical waveguide side is inclined.   2. The photoelectric composite module according to claim 1, wherein the optical element has an input part or an output part of the light formed on a circuit board on which the optical element is mounted. module. An optical element having an input part or an output part of light;
An optical axis direction conversion unit that inclines the optical axis of the light on the optical element side;
An optical waveguide optically connected to the optical element via the optical axis direction converter,
An optical transceiver circuit element;
A substrate on which the optical element and the optical transceiver circuit element are mounted;
A photoelectric composite module comprising:
The optical waveguide has a structure in which a core having a relatively high refractive index and a periphery of the core are covered with a clad having a relatively low refractive index, and the core is formed by the light input portion or the output portion of the optical element. A portion extending linearly in parallel with the formed surface, wherein the end of the core on the side of the optical axis direction conversion unit is curved toward the side of the optical axis direction conversion unit. Photoelectric composite module.   9. The photoelectric composite module according to claim 8, wherein the optical axis direction converting portion is formed in a spherical shape or an elliptical shape with the same material as the cladding.   9. The photoelectric composite module according to claim 8, wherein the optical axis direction conversion portion is formed in a hemispherical shape on the surface on the optical element side.   9. The photoelectric composite module according to claim 8, wherein the optical axis direction converting portion is formed in a hemispherical shape on an end surface of the optical waveguide that is curved toward the optical axis direction converting portion. A photoelectric composite module characterized by comprising:   9. The photoelectric composite module according to claim 8, wherein the optical axis direction conversion unit has a reflection surface, and the light on the optical element side is reflected by the reflection surface to reflect the light axis on the optical element side. Alternatively, a photoelectric composite module characterized in that an optical axis of light on the optical waveguide side is inclined.   9. The photoelectric composite module according to claim 8, wherein the optical element has an input part or an output part of the light formed on a circuit board on which the optical element is mounted. module. A photoelectric composite module;
A semiconductor element electrically connected to the photoelectric composite module;
A transmission apparatus comprising: a circuit board on which a wiring pattern for mounting the photoelectric composite module and the semiconductor element and electrically connecting the photoelectric composite module and the semiconductor element is formed;
The photoelectric composite module is
An optical element having an input part or an output part of light;
An optical axis direction conversion unit that inclines the optical axis of light on the light input part side or output part side of the optical element;
An optical waveguide optically connected to the optical element via the optical axis direction converter,
An optical transceiver circuit element;
A transmission device using an opto-electric composite module, comprising: a substrate on which the optical element and the optical transceiver circuit element are mounted.   15. The transmission device using the optoelectric composite module according to claim 14, wherein the optical waveguide of the optoelectronic composite module is a core having a relatively high refractive index and a clad having a relatively low refractive index around the core. The core has a portion extending linearly in parallel with the surface on which the light input portion or output portion of the optical element is formed, and the core is on the side of the optical axis direction conversion portion. A transmission device using a photoelectric composite module, characterized in that it is bent at the end of the optical axis direction conversion portion.

Images