WO2022144999A1 - 光レセプタクルおよび光モジュール - Google Patents
光レセプタクルおよび光モジュール Download PDFInfo
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- WO2022144999A1 WO2022144999A1 PCT/JP2020/049186 JP2020049186W WO2022144999A1 WO 2022144999 A1 WO2022144999 A1 WO 2022144999A1 JP 2020049186 W JP2020049186 W JP 2020049186W WO 2022144999 A1 WO2022144999 A1 WO 2022144999A1
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- optical
- axis
- light
- receptacle
- focal point
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- 230000003287 optical effect Effects 0.000 title claims abstract description 422
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 230000008878 coupling Effects 0.000 claims description 32
- 238000010168 coupling process Methods 0.000 claims description 32
- 238000005859 coupling reaction Methods 0.000 claims description 32
- 230000005540 biological transmission Effects 0.000 abstract description 20
- 239000000758 substrate Substances 0.000 description 25
- 238000010586 diagram Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 239000004697 Polyetherimide Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920001601 polyetherimide Polymers 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
Definitions
- the present invention relates to an optical receptacle and an optical module.
- an optical module equipped with a photoelectric conversion element has been used for optical communication using an optical transmitter such as an optical fiber or an optical waveguide.
- the optical module When the optical module is an optical module for transmission, the optical module has an optical receptacle for incident light including communication information emitted from a light emitting element on an end face of an optical transmitter.
- the optical module when the optical module is an optical module for reception, the optical module has an optical receptacle for incidenting light including communication information emitted from an optical transmitter onto a light receiving element.
- Patent Documents 1 and 2 disclose such an optical receptacle.
- the lens (optical surface) facing the photoelectric conversion element (light emitting element or light receiving element) is usually a circularly symmetric convex lens surface having a shallow depth of focus.
- FIG. 1 is a diagram showing a state when collimated light is incident on a circularly symmetric convex lens surface having a shallow depth of focus from the inside of an optical receptacle.
- the intersection of the optical axis of the convex lens surface and the convex lens surface is the origin
- the optical axis of the convex lens surface is the Z axis
- the axis passing through the origin and perpendicular to the Z axis is the X axis
- the Z axis and the axis perpendicular to the X axis are Y. Use as the axis.
- the curvature of the convex lens surface in the XZ plane passing through the origin is the same as the curvature of the convex lens surface in the YZ plane passing through the origin. As shown in FIG. 1, the light incident on the circularly symmetric convex lens surface converges to one point (focal point) on the Z axis.
- the convex lens surface is used for the incident surface (optical surface facing the light emitting element) of the optical receptacle of the optical module for transmission, the light coupling efficiency is permissible centering on the focal position shown in FIG.
- the light emitting element is arranged within a predetermined range (Z tolerance range).
- the convex lens surface is used for the emission surface (optical surface facing the light receiving element) of the optical receptacle of the optical module for reception, the light coupling efficiency is permissible centering on the focal position shown in FIG.
- the light receiving element is arranged within a predetermined range (Z tolerance range).
- the Z tolerance range of the convex lens surface is narrow, so when assembling the optical module, high accuracy is required for the positioning of the photoelectric conversion element. Even if the optical module is assembled by properly positioning the photoelectric conversion element, the focal position of the convex lens surface may move in the Z-axis direction due to the temperature change during use of the optical module, and the position of the photoelectric conversion element may change. It may be out of the Z tolerance range.
- an object of the present invention is to provide an optical receptacle having a wide Z tolerance range of the optical surface facing the photoelectric conversion element, and an optical module having the optical receptacle.
- the optical receptacle according to the present invention is an optical receptacle that is arranged between a photoelectric conversion element and an optical transmission body and optically couples the photoelectric conversion element and the end face of the optical transmission body, and is the photoelectric conversion element.
- a first optical surface that causes the light emitted from the conversion element to enter, or emits light emitted from the end face of the optical transmitter and passing through the inside of the optical receptacle toward the photoelectric conversion element, and the first optical surface.
- the first optical surface has a second optical surface for emitting light incident on the optical surface toward the end face of the optical transmitter or incident light emitted from the end surface of the optical transmitter.
- the intersection of the optical axis and the first optical surface is the origin, the optical axis of the first optical surface is the Z axis, the axis passing through the origin and perpendicular to the Z axis is the X axis, and perpendicular to the Z axis and the X axis.
- the first optical surface is observed along the direction of the X-axis when collimated light is incident on the first optical surface from the inside of the optical receptacle when the first optical surface is the Y-axis.
- the first focal point and the second focal point observed on the first optical surface side of the first focal point when viewed along the Y-axis direction are formed.
- the optical module according to the present invention has a photoelectric conversion element and an optical receptacle according to the present invention.
- an optical receptacle having a wide Z tolerance range of the optical surface facing the photoelectric conversion element and an optical module having the optical receptacle. Therefore, according to the present invention, it is possible to provide an optical module that is easy to assemble and resistant to temperature changes.
- FIG. 1 is a diagram showing a state when collimated light is incident on a circularly symmetric convex lens surface having a shallow depth of focus.
- 2A and 2B are diagrams showing the configuration of an optical module and an optical receptacle according to the first embodiment.
- FIG. 3 is a diagram showing a first focal point and a second focal point formed by the first optical surface.
- 4A is a diagram showing the simulation settings in the optical module according to the first embodiment
- FIGS. 4B and 4C are graphs showing the results of the simulation in the optical module according to the first embodiment.
- 5A to 5C are diagrams showing the configuration of the optical module and the optical receptacle according to the second embodiment.
- FIG. 6A is a diagram showing a simulation setting in the optical module according to the second embodiment
- FIGS. 6B and 6C are graphs showing the result of the simulation in the optical module according to the second embodiment.
- FIGS. 2A and 2B are diagrams showing the configuration of the optical module 100 according to the first embodiment of the present invention.
- 2A is a plan view of the optical module 100
- FIG. 2B is a cross-sectional view taken along the line AA shown in FIG. 2A.
- the optical transmitter 160 is shown by a broken line.
- the optical module 100 includes a substrate-mounted photoelectric conversion device 120 including a light emitting element 122 and an optical receptacle 140.
- the optical module 100 is an optical module for transmission, and an optical transmitter 160 is coupled (hereinafter, also referred to as a connection) to an optical receptacle 140 and used.
- the photoelectric conversion device 120 has a substrate 121 and a light emitting element 122.
- the substrate 121 supports the light emitting element 122 and is fixed to the optical receptacle 140.
- the substrate 121 is, for example, a glass composite substrate, a glass epoxy substrate, a flexible sill substrate, or the like.
- a light emitting element 122 is arranged on the substrate 121.
- the light emitting element 122 emits light toward the optical transmitter 160.
- the light emitting element 122 is, for example, a vertical cavity surface emitting laser (VCSEL).
- the number of light emitting elements 122 is not particularly limited and is selected according to the configuration of the optical receptacle 140. In this embodiment, the number of light emitting elements 122 is one.
- the light emitting element 122 is arranged so that the light emitting surface 123 is located within the Z tolerance range of the first optical surface 141 of the optical receptacle 140.
- the optical receptacle 140 is arranged on the substrate 121 of the photoelectric conversion device 120.
- the optical receptacle 140 optically couples the light emitting surface 123 of the light emitting element 122 and the end surface 162 of the optical transmission body 160 in a state of being arranged between the photoelectric conversion element (light emitting element 122) and the optical transmission body 160.
- the optical receptacle 140 optically couples the light emitting surface 123 of one light emitting element 122 and the end surface 162 of one optical transmitter 160, whereas the optical receptacle 140 has a plurality of light emitting elements.
- the light emitting surface 123 of the 122 and the end surface 162 of the plurality of optical transmitters 160 may be optically coupled to each other.
- the configuration of the optical receptacle 140 will be described in detail separately.
- the type of the optical transmitter 160 is not particularly limited. Examples of the types of optical transmitters 160 include optical fibers and optical waveguides. In this embodiment, the optical transmitter 160 is an optical fiber.
- the number of optical transmitters 160 is not particularly limited and is selected according to the configuration of the optical receptacle 140. The number of optical transmitters 160 may be one or plural. In the present embodiment, the number of optical transmitters 160 is one.
- the optical module may be an optical module for reception.
- the photoelectric conversion element is a light receiving element instead of the light emitting element, and the light emitted from the optical transmitter 160 is incident on the light receiving element.
- the optical receptacle 140 has translucency, and optical transmission is performed between a first optical surface 141 that causes at least a part of the light emitted from the light emitting element 122 to be incident on the optical receptacle 140 and the light that is incident on the first optical surface. It has a second optical surface 142 that emits light toward the end surface of the body 160.
- the number of the first optical surface 141 and the number of the second optical surface 142 are one each.
- the optical receptacle 140 has a positioning portion 144 for positioning the optical transmitter 160 and a direction along the Z axis between the first optical surface 141 and the light emitting surface 123 of the light emitting element 122 (light emitting element). It further has a substrate fixing portion 145 for fixing the optical receptacle 140 on the substrate 121 while determining the distance (in the optical axis direction of 122).
- the optical receptacle 140 is formed by using a material having translucency with respect to light having a wavelength used for optical communication. Examples of such materials include transparent resins such as polyetherimide (PEI) and cyclic olefin resins. Further, the optical receptacle 140 is manufactured, for example, by injection molding.
- PEI polyetherimide
- cyclic olefin resins examples include transparent resins such as polyetherimide (PEI) and cyclic olefin resins.
- the optical receptacle 140 is manufactured, for example, by injection molding.
- the positioning unit 144 positions the end face 162 of the optical transmitter 160 with respect to the optical receptacle 140.
- the configuration of the positioning unit 144 is not particularly limited as long as the above functions can be exhibited.
- the positioning portion 144 has a bottomed cylindrical shape.
- the first optical surface 141 is an optical surface that causes the light emitted from the light emitting element 122 to enter the inside of the optical receptacle 140.
- the first optical surface 141 is formed on the bottom of the substrate fixing portion 145, which will be described later.
- the first optical surface 141 is a convex lens surface that is convex toward the light emitting element 122. The details of the shape of the first optical surface 141 will be described with reference to FIG.
- FIG. 3 is a diagram showing a state when collimated light is incident on the first optical surface 141 from the inside of the optical receptacle 140.
- the intersection of the optical axis of the first optical surface 141 and the first optical surface 141 is the origin
- the optical axis of the first optical surface 141 is the Z axis
- the axis passing through the origin and perpendicular to the Z axis is the X axis and the Z axis.
- the axis perpendicular to the X axis is the Y axis.
- the curvature of the first optical surface 141 in the XZ plane passing through the origin is larger than the curvature of the first optical surface 141 in the YZ plane passing through the origin.
- the first optical surface 141 is a convex lens surface whose curvature in the XZ plane passing through the origin is larger than the curvature in the YZ plane passing through the origin. Therefore, as shown in FIG. 3, the light incident on the first optical surface 141 does not converge to one point (focal point) on the Z axis. Specifically, when collimated light is incident on the first optical surface 141 from the inside of the optical receptacle 140, it is observed along the direction of the X-axis and the first focal point observed along the direction of the Y-axis. When viewed, a second focal point observed on the first optical surface 141 side of the first focal point is formed.
- the first focal point is formed due to the curvature of the first optical surface 141 along the Y-axis direction
- the second focal point is formed due to the curvature of the first optical surface 141 along the X-axis direction. That is, the first optical surface 141 is the first focal point observed when viewed along the direction of the X axis when collimated light is incident on the first optical surface 141 from the inside of the optical receptacle 140, and the Y axis.
- the second focal point observed on the first optical surface 141 side of the first focal point when viewed along the direction of is formed.
- the first optical surface 141 is symmetric with respect to the XZ plane and also with respect to the YZ plane. Therefore, the first optical surface 141 is not circularly symmetric, but is twice symmetric.
- the first optical surface 141 is not limited to this.
- the first optical surface 141 is not particularly limited as long as it can form the first focus and the second focus described above, and may be, for example, a diffractive lens.
- the distance between the first focal point and the second focal point is preferably 100 ⁇ m or more and 180 ⁇ m or less from the viewpoint of light coupling efficiency and correct signal transmission. Details of this will be described later.
- the size of the first optical surface 141 is not particularly limited, but is preferably the same as or larger than the size of the light emitting surface 123 of the light emitting element 122.
- the central axis CA1 of the first optical surface 141 is preferably perpendicular to the light emitting surface 123 of the light emitting element 122. It is preferable that the central axis CA1 of the first optical surface 141 coincides with the optical axis OA of the light emitted from the light emitting surface 123 of the light emitting element 122.
- the light emitting surface 123 of the light emitting element 122 and the first optical surface 141 can be separated from each other, and the light emitting surface 123 and the first optical surface of the light emitting element 122 can be separated from each other. 1 It is possible to prevent the optical surface 141 from being damaged.
- the light emitting surface 123 of the light emitting element 122 is arranged so as to be located within the Z tolerance range of the first optical surface 141, and preferably is arranged so as to be located near the center within the Z tolerance range.
- the bottom of the positioning portion 144 contacts the cladding of the optical transmitter 160.
- the end face 162 of the optical transmitter 160 can receive the light emitted from the light emitting element 122.
- the second optical surface 142 is an optical surface that emits light traveling from the first optical surface 141 toward the end surface 162 of the optical transmitter 160.
- the second optical surface 142 is arranged on the opposite side of the first optical surface 141 so as to face the end surface 162 of the optical transmitter 160.
- the shape of the second optical surface 142 is not particularly limited. In this embodiment, the second optical surface 142 is a flat surface.
- the board fixing portion 145 fixes the optical receptacle 140 to the board 121.
- the configuration of the substrate fixing portion 145 is not particularly limited as long as the above functions can be exhibited.
- the substrate fixing portion 145 has a bottomed cylindrical shape.
- the optical receptacle may be an optical receptacle for reception.
- the second optical surface 142 incidents the light from the optical transmitter, and the first optical surface 141 emits the light toward the light receiving element.
- the distance between the first focal point and the second focal point, the positional deviation of the light emitting element 122 in the direction along the Z axis, the light emitting element 122, and the optical transmitter 160 is described below.
- FIG. 4A is a schematic diagram showing how light is emitted from the light emitting element 122, light is incident on the first optical surface 141, and the light reaches the optical transmission body 160. Note that FIG. 4A is for illustration purposes only and does not represent an actual scale.
- FIG. 4B shows the distance between the first focal point and the second focal point (interfocal distance), the amount of movement of the light emitting element 122 from the design position, and the optical coupling efficiency between the light emitting element 122 and the optical transmitter 160. It is a figure which shows the relationship with the change of. As shown in FIG. 4A, the amount of movement from the design position is a negative value when the light emitting element 122 and the first optical surface 141 are close to each other, and a positive value when they are separated from each other.
- FIG. 4A it is a graph showing how the optical coupling efficiency fluctuates when the distance between the light emitting element 122 and the first optical surface 141 is fluctuated. ..
- 0 dB is set when the optical coupling efficiency is the maximum value for each focal distance.
- the distance between the light emitting surface 123 of the light emitting element 122 and the first optical surface 141 is 1.56 mm when it is in the design position.
- the shorter the distance between the focal points the more vulnerable to fluctuations in the distance between the light emitting element 122 and the first optical surface 141, and the more vulnerable the distance between the light emitting element 122 and the first optical surface 141 is.
- the difference from the maximum value of the coupling efficiency becomes large. That is, the shorter the distance between focal points, the narrower the Z tolerance range.
- the optical receptacle meets the following specifications. That is, even when the temperature changes from 0 ° C. to 70 ° C. and the distance between the light emitting element 122 and the first optical surface 141 moves by a maximum of 30 ⁇ m, the fluctuation range of the coupling efficiency is suppressed to ⁇ 0.5 dB. Is preferable.
- the conventional optical receptacle with an interfocal distance of 0 ⁇ m has a difference from the maximum value of the coupling efficiency in the range of the movement amount of 30 ⁇ m (the curve is not symmetrical, but from a point of about 0 ⁇ m to ⁇ 15 ⁇ m). However, it is not suppressed to -0.5 dB and does not meet the above specifications.
- the difference from the maximum value of the coupling efficiency is suppressed to ⁇ 0.5 dB in the above range. Therefore, it meets the above specifications.
- Table 1 shows that the distance between the first focal point and the second focal point (interfocal distance) and the Z tolerance range (the difference between the maximum value of the coupling efficiency and the maximum value are within the range of -0.5 dB).
- the movable distance in the direction along the Z axis of the light emitting element 122) is shown.
- the width of the above graph is 30 ⁇ m, and it is located at the boundary where the above specifications can be satisfied (see FIG. 4B). That is, the distance between the first focal point and the second focal point is preferably 100 ⁇ m or more.
- FIG. 4C also shows the distance between the first focal point and the second focal point (interfocal distance), the moving distance of the light emitting element 122 in the direction along the Z axis, and the light between the light emitting element 122 and the optical transmitter 160. It is a figure which shows the relationship with the coupling efficiency.
- the light coupling efficiency that is, the amount of light emitted from the light emitting element 122) when it is assumed that all the light emitted from the light emitting element 122 is incident on the optical transmitter 160 is set to 0 dB.
- the optical coupling efficiency is suppressed to -7 dB from the viewpoint of correctly transmitting a signal.
- the coupling efficiency is suppressed to -7 dB at all of the focal lengths of 100 ⁇ m, 150 ⁇ m, and 180 ⁇ m in the range of the movement amount of 30 ⁇ m (the curve is not symmetrical, but ⁇ 15 ⁇ m from the point of about 0 ⁇ m). Therefore, the above specifications can be satisfied.
- the one having an interfocal distance of 180 ⁇ m is located near the boundary where the above specifications can be satisfied. Table 2 below quantifies this. As can be seen from FIG. 4C and Table 2, the interfocal distance between the first focal point and the second focal point is preferably 180 ⁇ m or less.
- the optical receptacle 140 according to the first embodiment has a wider Z tolerance range than the conventional optical receptacle. Therefore, the optical module 100 according to the present embodiment is easy to assemble and resistant to temperature changes. For example, in the optical module 100 according to the present embodiment, the coupling efficiency fluctuates even if the focal position of the first optical surface 141 shifts in the direction along the Z axis due to a volume change or a refractive index change due to a temperature change. It's hard to do.
- FIG. 5A is a diagram schematically showing a cross section of the optical module 200 according to the second embodiment.
- 5B is a plan view of the optical receptacle 240 according to the second embodiment, and
- FIG. 5C is a perspective view seen from the bottom surface side.
- the optical module 200 includes a substrate-mounted photoelectric conversion device 220 including a light receiving element 222 and an optical receptacle 240.
- the optical module 200 is an optical module for receiving light, and an optical transmitter 260 is coupled (hereinafter, also referred to as a connection) to an optical receptacle 240 via a ferrule.
- the type of optical transmitter 260 is not particularly limited. Examples of the types of the optical transmitter 160 include optical fibers, optical waveguides, and the like.
- the optical transmitter 260 is an optical fiber.
- the optical fiber may be a single mode system or a multimode system.
- the number of optical transmitters 260 is 1 or 2 or more. In the present embodiment, the number of optical transmitters 260 is 2 or more.
- the photoelectric conversion device 220 has a substrate 221 and a light receiving element 222.
- the substrate 221 supports the light receiving element 222.
- the substrate 221 is, for example, a glass composite substrate, a glass epoxy substrate, a flexible sill substrate, or the like.
- a light receiving element 222 is arranged on the substrate 121.
- the light receiving element 222 is arranged on the substrate 221 and receives the light from the optical receptacle 240.
- the number of light receiving elements 222 is 1 or 2 or more. In this embodiment, the number of light receiving elements 222 is 2 or more.
- the light receiving element 222 is arranged so that the light receiving surface 224 is located within the Z tolerance range of the first optical surface 241 of the optical receptacle 240.
- the optical receptacle 240 is arranged on the substrate 221 of the photoelectric conversion device 220.
- the optical receptacle 240 optically couples the end surface 225 of the optical transmitter 260 and the light receiving surface 224 of the light receiving element 222 in a state of being arranged between the photoelectric conversion device (light receiving element 222) and the optical transmitter 260. Let me.
- the configuration of the optical receptacle 240 will be described in detail separately.
- the optical module may be an optical module for transmission.
- the photoelectric conversion element is a light emitting element, and the light emitted from the light emitting element is incident on the optical transmitter 160.
- the optical receptacle 240 has translucency, and receives light incident on the second optical surface 242 and the second optical surface 242, which causes the light emitted from the end surface 265 of the optical transmitter 260 to be incident on the optical receptacle 240. It has a first optical surface 241 that emits light toward the light receiving surface 224 of the element 222. In the present embodiment, the number of the second optical surface 242 and the number of the first optical surface 241 is 2 or more, respectively.
- the optical receptacle 240 according to the present embodiment has a reflecting surface 243 in addition to the above configuration.
- the optical receptacle 240 is formed by using a material having translucency with respect to light having a wavelength used for optical communication. Examples of such materials include transparent resins such as polyetherimide (PEI) and cyclic olefin resins. Further, the optical receptacle 240 is manufactured, for example, by injection molding.
- PEI polyetherimide
- cyclic olefin resins examples include transparent resins such as polyetherimide (PEI) and cyclic olefin resins.
- the optical receptacle 240 is manufactured, for example, by injection molding.
- the second optical surface 242 is an optical surface that refracts the light emitted from the optical transmitter 260 and causes it to enter the inside of the optical receptacle 240.
- the second optical surface 242 can convert the light emitted from the optical transmitter 260 into collimated light, convergent light, or diffused light.
- the second optical surface 242 converts the light emitted from the optical transmitter 260 so as to become collimated light and narrows its luminous flux.
- the narrowed light beam is totally reflected by the reflection surface 243 and then heads toward the first optical surface 241 as described later.
- the shape of the second optical surface 242 is a convex lens surface that is convex toward the optical transmitter 260.
- the plan view shape of the second optical surface 242 is a circular shape.
- the reflection surface 243 is an inclined surface formed on the top surface side of the optical receptacle 240, and is arranged on an optical path between the second optical surface 242 and the first optical surface 241.
- the reflecting surface 243 reflects the light incident on the second optical surface 242 (light emitted from the optical transmitter 260) toward the first optical surface 241.
- the reflective surface 243 may be a flat surface or a curved surface. In this embodiment, the reflective surface 243 is a flat surface.
- the reflective surface 243 is inclined so as to approach the optical transmitter 260 from the bottom surface of the optical receptacle 240 toward the top surface.
- the inclination angle of the reflecting surface 243 is 45 ° with respect to the optical axis of the light incident on the second optical surface 242.
- the light incident on the second optical surface 242 is internally incident on the reflecting surface 243 at an incident angle larger than the critical angle. As a result, the reflecting surface 243 totally reflects the incident light so as to be perpendicular to the surface of the
- the first optical surface 241 is an optical surface that emits light reflected by the reflecting surface 243 toward the light receiving surface 224 of the light receiving element 222.
- the first optical surface 241 is arranged on the bottom surface of the optical receptacle 240 so as to face the light receiving surface 224 of the light receiving element 222.
- the shape of the first optical surface 241 is a convex lens surface that is convex toward the light receiving surface 224 of the light receiving element 222.
- the central axis CA of the first optical surface 241 coincides with the optical axis OA of the light receiving surface 224 of the light receiving element 222.
- the first optical surface 241 of the optical receptacle 240 according to the second embodiment has the same characteristics as the first optical surface 141 of the optical receptacle 140 according to the first embodiment. That is, as shown in FIG. 3, when collimated light is incident on the first optical surface 241 from the inside of the optical receptacle 240, the first focal point observed when viewed along the X-axis direction and the Y-axis are observed. A second focal point observed on the first optical surface 241 side of the first focal point is formed when viewed along the direction of.
- the definition of the XYZ coordinate system is the same as that of the first embodiment.
- the first optical surface 241 is a convex lens surface whose curvature in the XZ plane passing through the origin is larger than the curvature in the YZ plane passing through the origin.
- the first focal point is formed due to the curvature of the first optical surface 241 along the Y-axis direction
- the second focal point is formed due to the curvature of the first optical surface 241 along the X-axis direction. That is, the first optical surface 241 has a first focal point observed when viewed along the direction of the X axis when collimated light is incident on the first optical surface 241 from the inside of the optical receptacle 240, and the Y axis.
- the second focal point observed on the first optical surface 241 side of the first focal point when viewed along the direction of is formed.
- the first optical surface 241 is symmetric with respect to the XZ plane and also with respect to the YZ plane. Therefore, the first optical surface 241 is not circularly symmetric, but is twice symmetric.
- the first optical surface 241 is not limited to this.
- the first optical surface 241 is not particularly limited as long as it can form the first focus and the second focus described above, and may be, for example, a diffractive lens.
- the distance between the first focal point and the second focal point is preferably more than 0 ⁇ m and 100 ⁇ m or less, more preferably more than 0 ⁇ m and 80 ⁇ m or less, from the viewpoint of light coupling efficiency and correct signal transmission. Even more preferably, it exceeds 0 ⁇ m and 50 ⁇ m or less. Details of this will be described later.
- the light emitted from the optical transmitter 260 is incident on the inside of the optical receptacle 240 on the second optical surface 242.
- the light incident on the optical receptacle 240 is internally reflected by the reflecting surface 243 and travels toward the first optical surface 241.
- the light that has reached the first optical surface 241 is emitted so as to be focused toward the light receiving surface 224 of the first optical surface 241.
- the optical receptacle may be an optical receptacle for transmission.
- the first optical surface 241 incidents the light from the light emitting element, and the second optical surface 141 emits the light toward the optical transmitter 260.
- the reflecting surface 243 reflects the light incident on the first optical surface 241 (light emitted from the light emitting element) toward the second optical surface 242.
- the distance between the first focal point and the second focal point, the positional deviation of the light receiving element 222 in the direction along the Z axis direction, the optical transmitter 260 and the light receiving element 222 In the optical module 200 according to the second embodiment, the distance between the first focal point and the second focal point, the positional deviation of the light receiving element 222 in the direction along the Z axis direction, the optical transmitter 260 and the light receiving element 222.
- the relationship between the optical coupling efficiency and the optical coupling efficiency will be described below.
- FIG. 6A is a schematic diagram showing how light is emitted from the optical transmitter 260, light is incident on the second optical surface 242, light is emitted from the first optical surface 241 and the light reaches the light receiving element 222. be. Note that FIG. 6A is for illustration purposes only and does not represent an actual scale.
- FIG. 6B shows the distance between the first focal point and the second focal point (interfocal distance), the amount of movement of the light receiving element 222 from the design position, and the optical coupling efficiency between the optical transmitter 260 and the light receiving element 222. It is a figure which shows the relationship with the change of. As shown in FIG. 6A, the amount of movement from the design position is a negative value when the light receiving element 222 and the first optical surface 241 are close to each other, and a positive value when the light receiving element 222 is separated from the design position.
- FIG. 6B shows the light receiving element 222 and the first light receiving element 222 as shown in FIG. 6A when the interfocal distance between the first focus and the second focus is 0 ⁇ m (conventional technique), 100 ⁇ m, 150 ⁇ m, and 180 ⁇ m, respectively.
- 1 It is a graph which shows how the optical coupling efficiency fluctuates when the distance between it and an optical surface 241 is fluctuated. In this graph, 0 dB is set when the optical coupling efficiency is the maximum value for each focal distance. Further, the distance along the optical path from the second optical surface 242 to the light receiving surface 224 of the light receiving element 222 is set to 0.35 mm when it is in the design position.
- the shorter the distance between the focal points the more vulnerable the distance between the light receiving element 222 and the first optical surface 241 is, and the more vulnerable the distance between the light receiving element 222 and the first optical surface 241 is.
- the difference from the maximum value of the coupling efficiency becomes large. That is, the shorter the distance between focal points, the narrower the Z tolerance range.
- FIG. 6C also shows the distance between the first focal point and the second focal point (interfocal distance), the moving distance of the light receiving element 222 in the direction along the Z axis, and the light between the light receiving element 222 and the optical transmitter 260. It is a figure which shows the relationship with the coupling efficiency.
- Each shows how the optical coupling efficiency fluctuates when the distance between the light receiving element 222 and the first optical surface 241 is fluctuated.
- the light coupling efficiency that is, the amount of light emitted from the optical transmitter 260
- the light coupling efficiency that is, the amount of light emitted from the optical transmitter 260
- the coupling efficiency is suppressed to -2 dB in the range of the movement amount of 30 ⁇ m from the viewpoint of correctly transmitting the signal.
- the coupling efficiency is suppressed to -2 dB at any of the interfocal distances of 25 ⁇ m, 50 ⁇ m, and 100 ⁇ m, so that the above specifications can be satisfied at this point.
- the one having an interfocal distance of 100 ⁇ m is located at the boundary where the above specifications can be satisfied. Table 3 below quantifies this. As can be seen from FIG.
- the interfocal distance between the first focal point and the second focal point is preferably more than 0 ⁇ m and 100 ⁇ m or less, more preferably more than 0 ⁇ m and 80 ⁇ m or less, and even more preferably more than 0 ⁇ m and 50 ⁇ m or less. preferable.
- the optical receptacle 240 according to the second embodiment has a wider Z tolerance range than the conventional optical receptacle. Therefore, the optical module 200 according to the present embodiment is easy to assemble and resistant to temperature changes. For example, in the optical module 200 according to the present embodiment, the coupling efficiency is unlikely to fluctuate even if the position of the optical receptacle 240 shifts in the direction along the Z axis when the optical module 200 is assembled.
- optical receptacle and the optical module according to the present invention are useful for optical communication using, for example, an optical transmitter.
Abstract
Description
(光モジュールの構成)
以下、本発明の実施の形態1に係る光モジュールについて、添付した図面を参照して詳細に説明する。
光レセプタクル140は、透光性を有し、発光素子122から出射された光の少なくとも一部を、光レセプタクル140に入射させる第1光学面141と、第1光学面で入射した光を光伝送体160の端面に向けて出射させる第2光学面142を有する。本実施の形態では、第1光学面141、および第2光学面142の数は、それぞれ1つである。本実施の形態では、光レセプタクル140は、光伝送体160を位置決めするための位置決め部144と、第1光学面141と発光素子122の発光面123との間のZ軸に沿う方向(発光素子122の光軸方向)の距離を決めつつ、光レセプタクル140を基板121上に固定するための基板固定部145とをさらに有する。
実施の形態1に係る光モジュール100における、第1焦点と第2焦点との間の焦点間距離と、発光素子122のZ軸に沿う方向の位置ずれと、発光素子122と光伝送体160との間の光結合効率との関係について以下に説明する。
以上のように、実施の形態1に係る光レセプタクル140は、従来の光レセプタクルよりもZトレランス範囲が広い。したがって、本実施の形態に係る光モジュール100は、組み立てやすく、かつ温度変化に強い。たとえば、本実施の形態に係る光モジュール100は、温度変化に起因する体積変化や屈折率変化などより第1光学面141の焦点の位置がZ軸に沿う方向にずれたとしても結合効率が変動しにくい。
(光モジュールの構成)
以下、本発明の実施の形態2に係る光モジュールについて、添付した図面を参照して詳細に説明する。
光レセプタクル240は、透光性を有し、光伝送体260の端面265から出射された光を、光レセプタクル240に入射させる第2光学面242と、第2光学面242で入射した光を受光素子222の受光面224に向けて出射させる第1光学面241を有する。本実施の形態では、第2光学面242、および第1光学面241の数は、それぞれ2以上である。なお、本実施の形態に係る光レセプタクル240は、上記の構成に加え、反射面243を有する。
実施の形態2に係る光モジュール200における、第1焦点と第2焦点との間の焦点間距離と、受光素子222のZ軸方向に沿う方向の位置ずれと、光伝送体260と受光素子222との間の光結合効率との関係について以下に説明する。
以上のように、実施の形態2に係る光レセプタクル240は、従来の光レセプタクルよりもZトレランス範囲が広い。したがって、本実施の形態に係る光モジュール200は、組み立てやすく、かつ温度変化に強い。たとえば、本実施の形態に係る光モジュール200は、光モジュール200の組み立て時に光レセプタクル240の位置がZ軸に沿う方向にずれたとしても結合効率が変動しにくい。
120、220 光電変換装置
121、221 基板
122 発光素子
123 発光面
125 端面
140、240 光レセプタクル
141、241 第1光学面
243 反射面
142、242 第2光学面
144 位置決め部
145 基板固定部
146 第1凹部
160、260 光伝送体
222 受光素子
224 受光面
Claims (5)
- 光電変換素子と光伝送体との間に配置され、前記光電変換素子と前記光伝送体の端面とを光学的に結合するための光レセプタクルであって、
前記光電変換素子から出射された光を入射させるか、前記光伝送体の端面から出射され、前記光レセプタクルの内部を通った光を前記光電変換素子に向けて出射させる第1光学面と、
前記第1光学面で入射した光を前記光伝送体の端面に向けて出射させるか、前記光伝送体の端面から出射された光を入射させる第2光学面と、
を有し、
前記第1光学面の光軸と前記第1光学面との交点を原点、前記第1光学面の光軸をZ軸、前記原点を通り前記Z軸に垂直な軸をX軸、前記Z軸および前記X軸に垂直な軸をY軸としたとき、
前記第1光学面は、前記光レセプタクルの内部から前記第1光学面にコリメート光が入射した場合に、前記X軸の方向に沿って見たときに観察される第1焦点と、前記Y軸の方向に沿って見たときに前記第1焦点よりも前記第1光学面側に観察される第2焦点と、が形成されるように構成されている、
光レセプタクル。 - 前記第1光学面は、前記原点を通るXZ平面における曲率が、前記原点を通るYZ平面における曲率よりも大きい凸レンズ面である、請求項1に記載の光レセプタクル。
- 前記第1焦点と前記第2焦点との間の距離は、100μm以上180μm以下である、請求項1または請求項2に記載の光レセプタクル。
- 前記第1光学面と前記第2光学面との間に配置された反射面をさらに有し、
前記第1焦点と前記第2焦点との間の距離は、0μmを超え100μm以下である、
請求項1または請求項2に記載の光レセプタクル。 - 光電変換素子と、
請求項1~4のいずれか一項に記載の光レセプタクルと、
を有する、光モジュール。
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Citations (6)
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JPH10111438A (ja) * | 1996-10-07 | 1998-04-28 | Sony Corp | 光送受信装置 |
US20120189252A1 (en) * | 2011-01-20 | 2012-07-26 | Venkata Adiseshaiah Bhagavatula | Receptacle ferrule assemblies with gradient index lenses and fiber optic connectors using same |
JP2013024917A (ja) * | 2011-07-15 | 2013-02-04 | Enplas Corp | 光レセプタクルおよびこれを備えた光モジュール |
WO2014057666A1 (ja) * | 2012-10-10 | 2014-04-17 | 株式会社エンプラス | 光結合素子およびこれを備えた光モジュール |
JP2016139716A (ja) * | 2015-01-28 | 2016-08-04 | 日本オクラロ株式会社 | 受光モジュール |
JP2016142899A (ja) * | 2015-02-02 | 2016-08-08 | 株式会社エンプラス | 光モジュール |
-
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10111438A (ja) * | 1996-10-07 | 1998-04-28 | Sony Corp | 光送受信装置 |
US20120189252A1 (en) * | 2011-01-20 | 2012-07-26 | Venkata Adiseshaiah Bhagavatula | Receptacle ferrule assemblies with gradient index lenses and fiber optic connectors using same |
JP2013024917A (ja) * | 2011-07-15 | 2013-02-04 | Enplas Corp | 光レセプタクルおよびこれを備えた光モジュール |
WO2014057666A1 (ja) * | 2012-10-10 | 2014-04-17 | 株式会社エンプラス | 光結合素子およびこれを備えた光モジュール |
JP2016139716A (ja) * | 2015-01-28 | 2016-08-04 | 日本オクラロ株式会社 | 受光モジュール |
JP2016142899A (ja) * | 2015-02-02 | 2016-08-08 | 株式会社エンプラス | 光モジュール |
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