WO2022244230A1 - 光モジュール - Google Patents
光モジュール Download PDFInfo
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- WO2022244230A1 WO2022244230A1 PCT/JP2021/019345 JP2021019345W WO2022244230A1 WO 2022244230 A1 WO2022244230 A1 WO 2022244230A1 JP 2021019345 W JP2021019345 W JP 2021019345W WO 2022244230 A1 WO2022244230 A1 WO 2022244230A1
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- WIPO (PCT)
- Prior art keywords
- base
- optical element
- optical
- lens array
- adhesive
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 211
- 239000000853 adhesive Substances 0.000 claims abstract description 58
- 230000001070 adhesive effect Effects 0.000 claims abstract description 56
- 239000012790 adhesive layer Substances 0.000 claims description 21
- 239000004065 semiconductor Substances 0.000 claims description 9
- 230000008878 coupling Effects 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 8
- 238000005859 coupling reaction Methods 0.000 abstract description 8
- 239000004840 adhesive resin Substances 0.000 description 65
- 229920006223 adhesive resin Polymers 0.000 description 65
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000001629 suppression Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Images
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
- H01L31/16—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources
- H01L31/167—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers
- H01L31/173—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers formed in, or on, a common substrate
-
- 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
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0232—Optical elements or arrangements associated with the device
- H01L31/02325—Optical elements or arrangements associated with the device the optical elements not being integrated nor being directly associated with the device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
- H01S5/02253—Out-coupling of light using lenses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0235—Method for mounting laser chips
- H01S5/02355—Fixing laser chips on mounts
- H01S5/0236—Fixing laser chips on mounts using an adhesive
Definitions
- the present disclosure relates to an optical module with a lens array having a plurality of lens elements arranged in parallel.
- Japanese Unexamined Patent Application Publication No. 2002-100003 discloses an optical device that collects light output from a light source such as a laser diode with a lens and causes the light to enter an optical waveguide formed in an optical waveguide element.
- a lens is an optical component integrated with an optical element holder, and the optical component is sandwiched between two pedestals facing each other and fixed on the two pedestals with an adhesive, and the two pedestals are attached to the fixed base with an adhesive. Fixed.
- the lens array When the lens array is fixed to the base, the lens array is simply fixed to two pedestals sandwiched using an adhesive as shown in Patent Document 1, and then the two pedestals are fixed to the fixed base. Since two pedestals are used, the number of parts increases, and since a plurality of lens elements are arranged in parallel in the lens array, the horizontal direction in which the lens elements are arranged in parallel with respect to the base. Since the length of the lens array is longer than the height in the height direction, and the lens array itself is miniaturized, the inclination of the lens array in the horizontal direction becomes a problem.
- the centers (centers) of a plurality of precisely aligned lens elements in the lens array shift in the height direction with respect to the optical axes of the optical elements arranged opposite to each other.
- a difference in coupling efficiency may occur between the optical elements coupled via the lens element.
- the present disclosure has been made in view of the above points, and aims to obtain an optical module in which the inclination of the base of the lens array with respect to the plane is suppressed.
- An optical module includes a base having a flat surface, and a first optical element and a second optical element which are arranged on the flat surface of the base so as to face each other and each have a plurality of parallel optical axes. is arranged on the plane of the base between the optical element and the first optical element and the second optical element, and parallel to the plurality of optical axes of the first optical element and the second optical element and a lens array having a plurality of lens elements arranged in the same manner as each other, the plurality of lens elements optically coupling the first optical element and the second optical element, and the lens array faces the plane of the base.
- a plurality of adhesive layers are provided for adhering the plurality of adhesive surfaces of the lens array and the flat surface of the base and fixing the lens array to the flat surface of the base.
- the lens array has adhesive interference suppressing portions between a plurality of adhesive surfaces and adjacent adhesive surfaces, and a base between the plurality of adhesive surfaces and the plane of the base. Since a plurality of adhesive layers are provided for fixing to the plane, the tilt of the base of the lens array with respect to the plane is suppressed.
- FIG. 1 is a perspective view showing an optical module according to Embodiment 1;
- FIG. 4 is a front view showing a state in which a first adhesive resin is applied to the lens array in the optical module according to Embodiment 1;
- FIG. 4 is a front view showing a state in which a second adhesive resin is applied to the lens array in the optical module according to Embodiment 1;
- FIG. 4 is a front view showing a state in which a first adhesive resin and a second adhesive resin are applied to the lens array in the optical module according to Embodiment 1, cured, and the lens array is fixed to the base;
- FIG. FIG. 11 is a front view of a comparative example showing a state in which a first adhesive resin is applied to the lens array;
- FIG. 10 is a front view of a comparative example showing a state in which a second adhesive resin is applied to the lens array
- FIG. 5 is a front view of a comparative example showing a state in which a first adhesive resin and a second adhesive resin are applied to a lens array, cured, and fixed to a base.
- FIG. 11 is a front view showing a state in which a first adhesive resin and a second adhesive resin are applied to the lens array in the optical module according to Embodiment 2, cured, and the lens array is fixed to the base;
- FIG. 11 is a perspective view showing an optical module according to Embodiment 3;
- FIG. 14 is a front view showing a state in which a first adhesive resin and a second adhesive resin are applied to the lens array in the optical module according to Embodiment 3;
- FIG. 11 is a front view showing a state in which a first adhesive resin and a second adhesive resin are applied to the lens array in the optical module according to Embodiment 3, cured, and fixed to a base;
- FIG. 11 is a front view showing a state in which a first adhesive resin and a second adhesive resin are applied to a lens array in an optical module according to Embodiment 4;
- FIG. 16 is a front view showing a state in which a first adhesive resin and a second adhesive resin are applied to the lens array in the optical module according to Embodiment 4, cured, and fixed to a base;
- Embodiment 1 An optical module according to Embodiment 1 will be described with reference to FIGS. 1 to 4.
- FIG. The optical module according to the first embodiment is used for connecting optical fibers in the field of optical communication devices.
- the optical module according to Embodiment 1 includes a base 10, a first optical element 20, a second optical element 30, a lens array 40, and a first adhesive layer 51. and a second adhesive layer 52 .
- a plurality of lights emitted from the first optical element 20 are collected by the plurality of lens elements 41 to 44 of the lens array 40 and optically coupled to the second optical element 30. be.
- the base 10 is a plate-shaped metal having a flat horizontal surface 11, and is fixed to a housing, a wall, or the like.
- the base 10 may be a plane that can fix the first optical element 20, the second optical element 30, and the lens array 40 even if the horizontal plane 11 has some steps or irregularities.
- the first optical element 20 and the second optical element 30 are arranged facing each other on the horizontal surface 11 of the base 10, and each have a plurality of parallel optical axes L1 to L4 correspondingly.
- four optical axes L1 to L4 are shown, and an optical path is formed along which light emitted from the first optical element 20 propagates to the second optical element 30 along the optical axes. .
- the first optical element 20 is fixed to one end side of the horizontal plane 11 of the base 10 so as not to change its position with respect to the base 10 .
- the first optical element 20 is directly fixed to the horizontal surface 11 of the base 10, or mounted on a submount such as a ceramic substrate and directly fixed to the horizontal surface 11 of the base 10.
- First optical element Reference numeral 20 denotes, for example, a surface emitting semiconductor laser having a plurality of optical axes L1 to L4 that emit light in an array toward the other end of the horizontal plane 11 of the base 10 .
- the first optical element 20 is an optical element in which four semiconductor light emitting elements such as a semiconductor laser or a light emitting diode are incorporated as one module in addition to a surface emitting semiconductor laser, or one semiconductor light emitting element is combined with the semiconductor light emitting element. It is also possible to use an optical element incorporating a branching path or branching filter that separates the light from the light into four lights.
- the second optical element 30 is fixed on the other end side of the horizontal plane 11 of the base 10 so as not to change its position with respect to the base 10 .
- the second optical element 30 is, for example, a surface-receiving photodiode that receives the light emitted in an array from the first optical element 20 in an array.
- the second optical element 30 is an optical element in which four semiconductor light-receiving elements such as photodiodes are incorporated as one module in addition to surface-receiving photodiodes, or has four waveguides, each of which has four waveguides. It may be an optical element that performs optical processing such as modulation and amplification.
- the direction connecting one end and the other end on the horizontal plane 11 of the base 10 is the vertical direction
- the direction connecting one side and the other side on the horizontal plane 11 is the horizontal direction
- the direction perpendicular to the horizontal plane. is described as the vertical direction.
- the optical axes L1 to L4 are axes along the vertical direction, and the plurality of optical axes L1 to L4 are arranged in parallel in the horizontal direction.
- the lens array 40 is arranged on the horizontal plane 11 of the base 10 between the first optical element 20 and the second optical element 30 .
- the lens array 40 has a plurality of lens elements 41 to 44 arranged in parallel in the lateral direction corresponding to the plurality of optical axes L1 to L4 of the first optical element 20 and the second optical element 30,
- the overall shape is a rectangular parallelepiped.
- Each of the plurality of lens elements 41 to 44 is arranged with precise alignment.
- the cores (centers) of the plurality of lens elements 41-44 are on the optical axes L1-L4 of the corresponding first optical element 20 and second optical element 30, respectively.
- Each of the plurality of lens elements 41 to 44 is a convex lens that collects light emitted from the first optical element 20 and guides it to the second optical element 30. optically coupled to 30;
- the lens array 40 has a plurality of bonding surfaces 45 and 46 positioned side by side in the direction in which the plurality of lens elements are arranged in parallel, that is, in the lateral direction, on the surface of the base 10 facing the horizontal surface 11, that is, the bottom surface.
- An interference suppressing portion 47 of adhesive is provided between adjacent bonding surfaces 45 and 46 of the plurality of bonding surfaces 45 and 46 .
- first bonding surface 45 is the bottom surface located on one side in the horizontal direction
- second bonding surface is the other bonding surface located on the second bonding surface.
- the bonding surface 46 of No. 2 is the bottom surface located on the other lateral side and has the same area.
- the interference suppressing portion 47 is provided in the center of the bottom surface of the lens array 40 in the lateral direction, and protrudes toward the horizontal surface 11 of the base 10 with respect to the first adhesive surface 45 and the second adhesive surface 46. longitudinal direction).
- the interference suppressing portion 47 which is a protrusion, is a hexahedral metal body whose upper surface is fixed to the bottom surface of the lens array 40 and whose lower surface is a bonding horizontal surface (bonding plane) 47a in close contact with the horizontal surface 11 of the base 10.
- the interference suppressing portion 47 is separately formed on the bottom surface of the lens array 40, it may be formed integrally on the bottom surface of the lens array 40. FIG. When integrally formed, it is formed at the same time as the lens array 40 is formed.
- a plurality of bonding surfaces may be arranged at regular intervals.
- the area of each bonding surface is the same.
- the interference suppressing portion 47 is a projection provided between adjacent adhesive surfaces.
- the adhesive layers 51 and 52 are adhesive layers that adhere the plurality of adhesive surfaces 45 and 46 of the lens array 40 to the horizontal surface 11 of the base 10 and fix the lens array 40 to the horizontal surface 11 of the base 10 .
- the adhesive layers 51 and 52 are made of an adhesive resin that has viscosity and bonds the adhesive surfaces 45 and 46 of the lens array 40 and the horizontal surface 11 of the base 10 by curing.
- the adhesive layers 51,52 are as many as the adhesive surfaces 45,46.
- the adhesive resin 51a is applied to the first adhesive surface 45 among the plurality of adhesive surfaces 45 and 46 of the lens array 40 .
- the second adhesive surface 46 of the plurality of adhesive surfaces 45 and 46 of the lens array 40 is coated with the adhesive resin 52a in the same amount as the adhesive resin 51a.
- the interference suppressing portion 47 prevents the adhesive resin 52a applied later from flowing to the adhesive resin 51a, thereby preventing interference between the adhesive resins 51a and 52a. There is no difference in the thickness of the coating films of the adhesive resin 51a and the adhesive resin 52a, and the thickness of the coating films of the adhesive resin 51a and the adhesive resin 52a is uniform.
- each of the adhesive resins 51a and 52a shrinks according to the coating thickness.
- the film thicknesses of the agent layer 51 and the adhesive layer 52 are also the same.
- the cores (centers) of the plurality of lens elements 41 to 44 of the lens array 40 are respectively positioned on the optical axes L1 to L4 of the corresponding first optical element 20 and second optical element 30, the plurality of lens elements 40 of the lens array 40 There is no light coupling efficiency difference between the first optical element 20 and the second optical element 30 for each of the plurality of lights emitted from the first optical element 20 via the lens elements 41 to 44 of the A plurality of lights emitted from the first optical element 20 are received by the second optical element 30 with good efficiency.
- FIG. A comparative example eliminates the interference suppressor 47 from the optical module according to the first embodiment.
- the comparative example when mounting the lens array 40 on the horizontal surface 11 of the base 10, as in the optical module according to the first embodiment, first, as shown in FIG. Then, as shown in FIG. 6, the second adhesive surface 46 of the lens array 40 is coated with the adhesive resin 52a in the same amount as the adhesive resin 51a.
- the adhesive resins 51a and 52a have viscosity, the adhesive resin 52a applied later flows into the adhesive resin 51a, causing interference between the adhesive resin 51a and the adhesive resin 52a.
- the thickness becomes thinner than the thickness of the coating film of the adhesive resin 51a, and a difference occurs in the thickness of the coating films of the adhesive resin 51a and the adhesive resin 52a.
- the lens array 40 is adhered to the horizontal surface 11 of the base 10 by curing the adhesive resin 51a and the adhesive resin 52a.
- the corresponding shrinkage occurs, the film thickness of the adhesive layer 52 is thinner than the film thickness of the adhesive layer 51, and the lens array 40 is firmly fixed to the horizontal surface 11 of the base 10 at two locations in the lateral direction.
- the adhesive layer 52 side inclines low in the horizontal direction with respect to the horizontal plane 11 of the base 10 .
- the lens array 40 has the plurality of adhesive surfaces 45 and 46 and the adhesive interference suppression portions 47 between the adjacent adhesive surfaces 45 and 46. and a plurality of adhesive layers 51 and 52 fixed to the horizontal surface 11 of the base 10 are provided between the plurality of adhesive surfaces 45 and 46 and the horizontal surface 11 of the base 10. The inclination of the base 10 with respect to the horizontal plane 11 is suppressed, and the lens array 40 is firmly fixed to the horizontal plane 11 of the base 10 .
- the first optical element 20 and the second optical element 20 for each of the plurality of lights emitted from the first optical element 20 via the plurality of lens elements 41 to 44 of the lens array 40 There is no light coupling efficiency difference between the second optical element 30 and the plurality of lights emitted from the first optical element 20 are received by the second optical element 30 with good efficiency.
- Embodiment 2 An optical module according to Embodiment 2 will be described with reference to FIG.
- the cross section of the protrusion which is the interference suppression part 47 in the optical module according to the first embodiment, is rectangular, whereas the cross section is trapezoidal with a long lower side. 1, but the other points are the same.
- FIG. 8 the same reference numerals as in FIGS. 1 to 4 indicate the same or corresponding parts.
- the optical module according to the second embodiment configured in this way also has the same effect as the optical module according to the first embodiment, and the cross section of the protrusion as the interference suppression part 47 is trapezoidal with a long lower side. Therefore, the surface tension of the adhesive resins 51a and 52a applied to the first adhesive surface 45 and the second adhesive surface 46 can further suppress interference.
- Embodiment 3 An optical module according to Embodiment 3 will be described with reference to FIGS. 9 to 11.
- FIG. 1 in the optical module according to Embodiment 1, the first bonding surface 45 is the bottom surface located on one side in the horizontal direction, and the second bonding surface 45 is the bottom surface located on one lateral side. While the surface 46 is the bottom surface located on the other side in the horizontal direction, the first adhesive surface 45 is located on the horizontal surface 11 side of the base 10 with respect to the surface facing the horizontal surface 11 of the base 10 .
- the interference suppressing portion 47 of the lens array in the optical module according to Embodiment 3 is a space located between the adjacent projections 48 and 49 . That is, the optical module according to the third embodiment differs from the optical module according to the first embodiment only in that the protrusions 48 and 49 on which the bonding surfaces are formed and the interference suppressing portion 47 are provided. Elements are the same. In FIGS. 9 to 11, the same reference numerals as those in FIGS. 1 to 4 indicate the same or corresponding parts.
- the lens array 40 in the optical module according to the third embodiment protrudes from the bottom surface facing the horizontal surface 11 of the base 10 and has a plurality of protrusions 48 and 49 positioned side by side in the lateral direction.
- the surfaces of the portions 48 and 49 facing the horizontal surface 11 of the base 10 are the adhesive surfaces 45 and 46, and the space portions located between the adjacent protrusions 48 and 49 among the plurality of protrusions 48 and 49 are:
- An interference suppression portion 47 of adhesive resin applied to the adhesive surfaces 45 and 46 is formed.
- the projecting portions 48 and 49 are rectangular parallelepiped metal bodies.
- the bonding surfaces 45 and 46 of the protrusions 48 and 49 have the same area.
- the projections 48 and 49 are separately formed on the bottom surface of the lens array 40, they may be integrally formed on the bottom surface of the lens array 40. FIG. When integrally formed, it is formed at the same time as the lens array 40 is formed.
- the interference suppression part 47 is a space located between adjacent protrusions.
- the adhesive layers 51 and 52 respectively bond the plurality of adhesive surfaces 45 and 46 of the protrusions 48 and 49 provided on the lens array 40 to the horizontal surface 11 of the base 10, and attach the lens array 40 to the base 10. It is an adhesive layer that adheres to the horizontal surface 11 .
- the lens array 40 is mounted on the horizontal surface 11 of the base 10 as in the optical module according to the first embodiment. That is, as shown in FIG. 10, the adhesive resin 51a is applied to the first adhesive surface 45 among the plurality of adhesive surfaces 45 and 46 of the plurality of protrusions 48 and 49 of the lens array 40, and then the second adhesive surface 45 is applied. The bonding surface 46 is coated with the adhesive resin 52a in the same amount as the adhesive resin 51a.
- the interference suppressing portion 47 prevents the adhesive resin 52a applied later from flowing to the adhesive resin 51a, thereby preventing interference between the adhesive resins 51a and 52a. There is no difference in the thickness of the coating films of the adhesive resin 51a and the adhesive resin 52a, and the thickness of the coating films of the adhesive resin 51a and the adhesive resin 52a is uniform.
- each of the adhesive resins 51a and 52a shrinks according to the coating thickness.
- the film thicknesses of the agent layer 51 and the adhesive layer 52 are also the same.
- the cores (centers) of the plurality of lens elements 41 to 44 of the lens array 40 are respectively positioned on the optical axes L1 to L4 of the corresponding first optical element 20 and second optical element 30, the plurality of lens elements 40 of the lens array 40 There is no light coupling efficiency difference between the first optical element 20 and the second optical element 30 for each of the plurality of lights emitted from the first optical element 20 via the lens elements 41 to 44 of the A plurality of lights emitted from the first optical element 20 are received by the second optical element 30 with good efficiency.
- the lens array 40 protrudes from the bottom surface facing the horizontal surface 11 of the base 10 and has a plurality of protrusions 48 and 49 arranged side by side in the lateral direction.
- the surfaces of the plurality of projections 48 and 49 facing the horizontal surface 11 of the base 10 are the bonding surfaces 45 and 46, and between the adjacent projections 48 and 49 among the plurality of projections 48 and 49. Since the interfering suppressing portion 47 of the adhesive resin applied to the adhesive surfaces 45 and 46 is formed in the space, the inclination of the lens array 40 with respect to the horizontal plane 11 of the base 10 is suppressed. It is firmly fixed to the horizontal surface 11 of the base 10 .
- the first optical element 20 and the second optical element 20 for each of the plurality of lights emitted from the first optical element 20 via the plurality of lens elements 41 to 44 of the lens array 40 There is no light coupling efficiency difference between the second optical element 30 and the plurality of lights emitted from the first optical element 20 are received by the second optical element 30 with good efficiency.
- Embodiment 4 An optical module according to Embodiment 4 will be described with reference to FIGS. 12 and 13.
- FIG. The optical module according to the fourth embodiment has a plurality of inwardly recessed spherical surfaces in the optical module according to the third embodiment, and a part of the spherical surfaces is used as the adhesive surfaces 45 and 46. 3, but the other points are the same. 12 and 13, the same reference numerals as in FIGS. 9 to 11 denote the same or corresponding parts.
- the surfaces of the protrusions 48 and 49 facing the horizontal surface 11 of the base 10 are part of the spherical surfaces recessed inward, but the adhesive surfaces 45 and 46 are limited to spherical surfaces. Rather, the point is that it should be a surface that is recessed inward.
- the optical module according to the fourth embodiment configured in this way also has the same effect as the optical module according to the third embodiment, and in addition, the first adhesive surface 45 and the second adhesive surface 46 have protrusions 48, 49, the surface tension of the adhesive resins 51a and 52a applied to the first adhesive surface 45 and the second adhesive surface 46 can further suppress interference.
- first optical element 20 and the second optical element 30 are directly fixed to the horizontal surface 11 of the base 10 .
- a first optical element 20 and a second optical element 30 are respectively mounted on submounts such as substrates, and the first optical element 20 and the second optical element 30 are respectively mounted on the base 10 while being mounted on the submounts. may be fixed to the horizontal surface 11 of the
- the number of optical axes is shown as four, but the number is not limited to four, and may be any number.
- a plurality of optical axes L1 to L4 are located on a plane parallel to the horizontal plane 11 of the base 10 at regular intervals. However, it may be shifted in the height direction, and two-dimensional, for example, 2 ⁇ 2 may be arranged.
- light is emitted from the first optical element 20 to the second optical element 30 along all the optical axes L1 to L4. may emit light from the second optical element 30 to the first optical element 20 along the optical axes L1 to L4.
- one lens array 40 arranged between the first optical element 20 and the second optical element 30 is shown.
- a plurality of lens arrays 40 may be arranged in parallel between the optical element 20 and the second optical element 30 .
- the plurality of lens arrays 40 are all fixed to the base 10 as shown in the optical modules according to the first to fourth embodiments.
- the base 10 may be slanted, and the first optical element 20, the second optical element 30, and the lens array 40 may be arranged on an inclined plane that is a plane.
- An optical module according to the present disclosure is suitable for an optical module used in the field of optical communication devices, which includes a lens array having a plurality of lens elements arranged in parallel.
- 10 base, 11: horizontal surface, 20: first optical element, 30: second optical element, 40: lens array, 41 to 44: lens elements, 45, 46: adhesive surface, 47: interference suppression part, 48, 49: protrusion, 51: second 1 adhesive layer, 52 second adhesive layer.
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
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Abstract
Description
レンズは光学素子ホルダと一体になった光学部品であり、光学部品は対向した2つの台座によって挟持されて、2つの台座上に接着剤により固定され、2つの台座が接着剤により固定基台に固定されている。
その結果、レンズ素子を介して結合される光学素子間に結合効率差が生じてしまう恐れがある。
実施の形態1に係る光モジュールを図1から図4に基づいて説明する。
実施の形態1に係る光モジュールは、光通信デバイス分野において、光ファイバを接続するために使用される。
実施の形態1に係る光モジュールは、第1の光学素子20から出射された複数の光がレンズアレイ40の複数のレンズ素子41~44によって集光されて第2の光学素子30に光結合される。
基台10は、水平面11である平面に段差又は凹凸が多少あっても、第1の光学素子20と第2の光学素子30とレンズアレイ40が固定できる平面であればよい。
この例では、光軸をL1からL4の4本を示しており、光軸に沿って第1の光学素子20から出射される光が第2の光学素子30へ伝搬される光路が形成される。
第1の光学素子20は、基台10の水平面11に直接固定される、あるいは、セラミック基板などのサブマウントに実装された状態で基台10の水平面11に直接固定される
第1の光学素子20は、基台10の水平面11における他端側へアレイ状に光を出射する複数の光軸L1から光軸L4を有する、例えば、面発光型半導体レーザである。
第2の光学素子30は、第1の光学素子20からアレイ状に出射された光をアレイ状に受光する、例えば、面受光型フォトダイオードである。
光軸L1~L4は縦方向に沿った軸であり、複数の光軸L1~L4は横方向に並行に配列される。
レンズアレイ40は、第1の光学素子20及び第2の光学素子30の複数の光軸L1~L4に対応して横方向に並行して配置された複数のレンズ素子41~44を有し、全体形状として直方体の形状をなす。
複数のレンズ素子41~44の芯(中心)それぞれは、対応した第1の光学素子20及び第2の光学素子30の光軸L1~L4上にある。
複数のレンズ素子41~44それぞれは、第1の光学素子20から出射された光を集光して第2の光学素子30へ導く凸レンズであり、第1の光学素子20から第2の光学素子30へ光結合する。
干渉抑制部47は、レンズアレイ40の底面の横方向中央に設けられ、第1の接着面45及び第2の接着面46に対して基台10の水平面11側に突出した、底面の幅(縦方向)と同じ幅を持つ突起部である。
干渉抑制部47は、レンズアレイ40の底面に別体として構成したものを示しているが、レンズアレイ40の底面に一体として形成したものでもよい。一体として形成される場合は、レンズアレイ40の成形時に同時に成形される。
また、3つ以上の複数の接着面を配置した場合、干渉抑制部47は隣接する接着面の間それぞれに設けられる突起部である。
接着剤層51、52は、粘度を持ち、硬化されることにより、レンズアレイ40の接着面45、46と基台10の水平面11とを接着する接着樹脂によって形成される。
接着剤層51、52は、接着面45、46と同じ数である。
まず、図2に示すように、レンズアレイ40の複数の接着面45、46の内の第1の接着面45に接着樹脂51aを塗布する。
続いて、図3に示すように、レンズアレイ40の複数の接着面45、46の内の第2の接着面46に、接着樹脂51aの塗布量と同じ塗布量の接着樹脂52aを塗布する。
その結果、レンズアレイ40は、横方向に長くとも、基台10の水平面11に対して横方向に傾くことがなく、つまり、レンズアレイ40の複数のレンズ素子41~44の芯(中心)それぞれが基台10の水平面11に平行な平面に位置し、対応した第1の光学素子20及び第2の光学素子30の光軸L1~L4上に位置する。
比較例は、実施の形態1に係る光モジュールに対して、干渉抑制部47をなくしたものである。
比較例において、実施の形態1に係る光モジュールと同様に、レンズアレイ40を基台10の水平面11に実装する場合、まず、図5に示すように、レンズアレイ40の第1の接着面45に接着樹脂51aを塗布し、続いて、図6に示すように、レンズアレイ40の第2の接着面46に、接着樹脂51aの塗布量と同じ塗布量の接着樹脂52aを塗布する。
実施の形態2に係る光モジュールを図8に基づいて説明する。
実施の形態2に係る光モジュールは、実施の形態1に係る光モジュールにおける干渉抑制部47である突起部の横断面が長方形であるのに対して、下辺が長い台形とした点が実施の形態1に係る光モジュールと相違し、その他の点については同じである。
図8中、図1から図4に付された符号と同一符号は同一又は相当部分を示す。
実施の形態3に係る光モジュールを図9から図11に基づいて説明する。
実施の形態3に係る光モジュールは、実施の形態1に係る光モジュールが、レンズアレイ40において、第1の接着面45が横方向の一側辺側に位置する底面であり、第2の接着面46が横方向の他側辺側に位置する底面であるのに対して、第1の接着面45が基台10の水平面11に対向する面に対して基台10の水平面11側にレンズアレイ40における横方向の一側辺側に位置する底面から突出した突起部48における基台10の水平面11に対向する面であり、第2の接着面46が基台10の水平面11に対向する面に対して基台10の水平面11側にレンズアレイ40における横方向の他側辺側に位置する底面から突出した突起部49における基台10の水平面11に対向する面である点が相違する。
すなわち、実施の形態3に係る光モジュールは、接着面が形成される突起部48、49を設けた点と干渉抑制部47が実施の形態1に係る光モジュールと異なるだけであり、その他の構成要素については同じである。
図9から図11中、図1から図4に付された符号と同一符号は同一又は相当部分を示す。
突起部48、49における接着面45、46は、それぞれ同じ面積である。
突起部48、49は、レンズアレイ40の底面に別体として構成したものを示しているが、レンズアレイ40の底面に一体として形成したものでもよい。一体として形成される場合は、レンズアレイ40の成形時に同時に成形される。
3つ以上の複数の突起部を配置した場合、干渉抑制部47は隣接する突起部の間に位置する空間部である。
すなわち、図10に示すように、レンズアレイ40の複数の突起部48、49における複数の接着面45、46の内の第1の接着面45に接着樹脂51aを塗布し、次いで、第2の接着面46に、接着樹脂51aの塗布量と同じ塗布量の接着樹脂52aを塗布する。
その結果、レンズアレイ40は、横方向に長くとも、基台10の水平面11に対して横方向に傾くことがなく、つまり、レンズアレイ40の複数のレンズ素子41~44の芯(中心)それぞれが基台10の水平面11に平行な平面に位置し、対応した第1の光学素子20及び第2の光学素子30の光軸L1~L4上に位置する。
実施の形態4に係る光モジュールを図12及び図13に基づいて説明する。
実施の形態4に係る光モジュールは、実施の形態3に係る光モジュールにおける複数の、内側にへこんだ球面の一部とし、この球面の一部を接着面45、46とした点が実施の形態3に係る光モジュールと相違し、その他の点については同じである。
図12及び図13中、図9から図11に付された符号と同一符号は同一又は相当部分を示す。
Claims (7)
- 平面を有する基台と、
前記基台の平面上にそれぞれが対向して配置され、並行した複数の光軸をそれぞれが対応して有する第1の光学素子と第2の光学素子と、
前記第1の光学素子と前記第2の光学素子との間の前記基台の平面上に配置され、前記第1の光学素子及び前記第2の光学素子の複数の光軸に対応して並行して配置された複数のレンズ素子を有し、前記第1の光学素子と前記第2の光学素子とを前記複数のレンズ素子が光結合させるレンズアレイとを備え、
前記レンズアレイは、前記基台の平面に対向する面に、前記複数のレンズ素子が並行して配置された方向に並んで位置する複数の接着面と、前記複数の接着面の隣接する接着面との間に接着剤の干渉抑制部を有し、
前記レンズアレイの複数の接着面と前記基台の平面とを接着し、前記レンズアレイを前記基台の平面に固定する複数の接着剤層を備えた光モジュール。 - 前記第1の光学素子は、前記複数の光軸に光を出射する半導体発光素子により構成され、
前記第2の光学素子は、前記第1の光学素子から出射された光を受光する半導体受光素子により構成される、
請求項1に記載の光モジュール。 - 前記第1の光学素子と前記第2の光学素子の複数の光軸は、前記基台の平面に対して平行な平面上に位置する、請求項1又は請求項2に記載の光モジュール。
- 前記レンズアレイの干渉抑制部は、前記複数の接着面に対して前記基台の平面側に突出した突起部である請求項1から請求項3のいずれかに記載の光モジュール。
- 前記突起部は、前記基台の平面に接する接合平面を有する請求項4に記載の光モジュール。
- 前記レンズアレイの接着面は、前記基台の平面に対向する面に対して前記基台の平面側に突出した突起部における前記基台の平面に対向する面であり、
前記レンズアレイの干渉抑制部は、隣接する前記突起部の間に位置する空間部である請求項1から請求項3のいずれかに記載の光モジュール。 - 前記突起部における前記基台の平面に対向する面は、内側にへこんだ面である請求項6に記載の光モジュール。
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