WO2020100283A1 - 受光モジュール - Google Patents
受光モジュール Download PDFInfo
- Publication number
- WO2020100283A1 WO2020100283A1 PCT/JP2018/042461 JP2018042461W WO2020100283A1 WO 2020100283 A1 WO2020100283 A1 WO 2020100283A1 JP 2018042461 W JP2018042461 W JP 2018042461W WO 2020100283 A1 WO2020100283 A1 WO 2020100283A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- curved surface
- side curved
- lens
- light receiving
- light
- Prior art date
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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
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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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4266—Thermal aspects, temperature control or temperature monitoring
-
- 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
- G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
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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
- G02B6/42—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
-
- 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
- G02B6/4206—Optical features
-
- 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
- G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
Definitions
- the present invention relates to a light receiving module.
- the lens collects the light from the optical fiber on the light receiving surface of the light receiving element (for example, see Patent Document 1).
- the present invention has been made to solve the above problems, and an object thereof is to obtain a light receiving module capable of preventing a light receiving element from breaking down even when strong light is input.
- a light receiving module includes a light receiving element, a receptacle having an optical fiber stub, an incident side curved surface, an emitting side curved surface, and a cylindrical portion provided between the incident side curved surface and the emitting side curved surface.
- the optical fiber stub is held so that it does not come into contact with the lens and separates from it, and curved surfaces are provided on the entrance and exit sides of the lens.
- the light emitted from the optical fiber stub enters the lens from the incident side curved surface, it is condensed inside the lens and then spreads again, and the light emitted from the emission side curved surface is condensed on the light receiving surface of the light receiving element.
- the periphery of the condensing point inside the lens is heated and the refractive index fluctuates, so that the focal position of the light emitted from the lens shifts. Therefore, since the beam that strikes the light receiving surface of the light receiving element spreads, the current density flowing through the light receiving element is reduced, and it is possible to prevent the light receiving element from being damaged.
- FIG. 3 is a cross-sectional view showing the light receiving module according to the first embodiment.
- FIG. 3 is a cross-sectional view showing the lens according to the first embodiment.
- FIG. 6 is a sectional view showing a light receiving module according to a second embodiment.
- FIG. 6 is a cross-sectional view showing a lens according to a second embodiment.
- FIG. 9 is a top view showing a lens according to a third embodiment. It is sectional drawing which shows the light receiving module which concerns on Embodiment 4.
- FIG. 9 is a cross-sectional view showing a lens according to a fourth embodiment.
- the light receiving module according to the embodiment will be described with reference to the drawings.
- the same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.
- FIG. 1 is a sectional view showing a light receiving module according to the first embodiment.
- a light receiving element 2 is provided on the stem 1.
- the lead 3 penetrates the stem 1 and is connected to the light receiving element 2.
- the lens barrel 4 covers the light receiving element 2.
- a lens 5 is attached to the lens barrel 4.
- the receptacle 6 has an optical fiber stub 7.
- the receptacle holder 8 holds the receptacle 6 so that the lens 5 and the optical fiber stub 7 do not contact but separate from each other.
- the receptacle 6 and the receptacle holder 8 are fixed to each other by penetration YAG welding or fillet YAG welding from the side surface.
- the receptacle holder 8 and the lens barrel 4 are fixed to each other by YAG welding the abutting portion from the side surface.
- FIG. 2 is a sectional view showing the lens according to the first embodiment.
- the lens 5 has an incident side curved surface 9, an emitting side curved surface 10, and a cylindrical portion 11 provided between the incident side curved surface 9 and the emitting side curved surface 10.
- the entrance-side curved surface 9 and the exit-side curved surface 10 are hemispheres having a radius of curvature of 0.75 mm, but they are not limited to this and may be aspherical shapes.
- the radius of the cylindrical portion 11 is 0.75 mm.
- the total length of the lens 5 is 5.92 mm.
- the lens 5 is made of a material having a refractive index of 1.5 such as BK-7.
- An antireflection film (not shown) is provided on the incident-side curved surface 9 and the outgoing-side curved surface 10.
- the optical fiber stub 7 is held so as not to contact the lens 5 and apart from each other, and curved surfaces are provided on the entrance and exit sides of the lens 5, respectively.
- the light emitted from the optical fiber stub 7 enters the lens 5 from the incident side curved surface 9, it is condensed inside the lens 5 and then spreads again, and the light emitted from the emission side curved surface 10 is condensed on the light receiving surface of the light receiving element 2.
- the periphery of the condensing point inside the lens 5 is heated and the refractive index fluctuates, so that the focal position of the light emitted from the lens 5 shifts. Therefore, since the beam that strikes the light receiving surface of the light receiving element 2 spreads, the density of the current flowing through the light receiving element 2 decreases, and it is possible to prevent the light receiving element 2 from malfunctioning.
- the material of the lens 5 may be doped with metal ions or the like that absorb light so that the lens 5 may easily generate heat.
- the emission end face of the optical fiber stub 7 is vertically polished. If the reflected return light from the emission end face of the optical fiber stub 7 poses a problem, an antireflection film may be provided on the emission end face of the optical fiber stub 7.
- FIG. 3 is a cross-sectional view showing the light receiving module according to the second embodiment.
- FIG. 4 is a sectional view showing the lens according to the second embodiment.
- the incident side curved surface 9 is a hemisphere having a radius of curvature of 0.5 mm.
- the emission side curved surface 10 is a hemisphere having a curvature radius of 0.75 mm.
- the radius of the cylindrical portion 11 is 1.5 mm and the total length is 2 mm.
- the lens 5 is made of a material having a refractive index of 1.8 such as TAF3.
- the center of curvature of the outgoing side curved surface 10 is offset by ⁇ 0.14 mm in the x direction with respect to the center of curvature of the incident side curved surface 9.
- the x direction is perpendicular to the optical axis.
- the entrance side curved surface 9 and the exit side curved surface 10 have different radii of curvature, and the centers of curvature are displaced.
- the emission end face of the optical fiber stub 7 is polished to 8 °.
- light is obliquely incident on the lens 5.
- the centers of curvature of the entrance side curved surface 9 and the exit side curved surface 10 are offset according to the angle of the incident light.
- the center of curvature of the outgoing side curved surface 10 and the center of the cylindrical portion 11 coincide with each other. Therefore, even if the light enters obliquely, the beam is focused on the surface of the light receiving element. Even when the light is obliquely incident in this way, the same effect as that of the first embodiment can be obtained.
- FIG. 5 is a top view showing the lens according to the third embodiment.
- the incident side end surface of the lens 5 also exists outside the incident side curved surface 9.
- the light receiving element 2 detects the light that has passed through the lens 5 without passing through the incident side curved surface 9, and therefore the optical fiber stub 7 may be fixed at an incorrect position. Therefore, in the present embodiment, the light-shielding coating 12 made of a material such as chromium is provided outside the incident-side curved surface 9 at the incident-side end surface of the lens 5.
- FIG. 6 is a sectional view showing a light receiving module according to the fourth embodiment.
- FIG. 7 is a sectional view showing a lens according to the fourth embodiment.
- the lens 5 is divided into four parts 5a, 5b, 5c and 5d.
- the component 5a is a hemisphere having a radius of 0.5 mm and corresponds to the incident side curved surface 9.
- the component 5b is a cylinder having a radius of 1.5 mm and a thickness of 0.5 mm.
- the component 5c is a cylinder having a radius of 0.5 mm and a thickness of 1.5 mm.
- the parts 5b and 5c correspond to the cylindrical portion 11.
- the component 5d is a hemisphere having a radius of 0.75 mm, and corresponds to the emission side curved surface 10.
- the center of the component 5d is offset by ⁇ 0.14 mm in the x direction with respect to the center of the component 5a.
- the center of the component 5d and the centers of the components 5b and 5c coincide with each other.
- the entrance-side curved surface 9, the exit-side curved surface 10, and the cylindrical portion 11 of the lens 5 are divided into different parts. These parts are bonded and integrated with an adhesive having the same refractive index as each part. This simplifies the shape of each component and facilitates the manufacture of the lens 5. If the lens 5 has a shape in which a part of the lens 5 projects laterally like the component 5b, the lens 5 can be easily attached to the lens barrel 4.
- each component is made of a material with a refractive index of 1.8 such as TAF3, and the refractive index of each component at room temperature is the same.
- the variation amount of the refractive index with respect to the temperature of the parts 5b and 5c of the cylindrical portion 11 is larger than that of the part 5a of the incident side curved surface 9 and the part 5d of the exit side curved surface 10. Therefore, the refractive index variation of the cylindrical portion 11 is large when strong light enters, and the beam that strikes the light receiving surface of the light receiving element 2 is likely to spread, so that the light receiving element 2 can be prevented from malfunctioning.
- a constriction 13 is provided on the side surface of the cylindrical portion 11 where light is condensed inside. Therefore, since the volume of the lens 5 is small, the heat energy required to heat the lens 5 can be small, and the refractive index variation of the lens 5 is likely to occur. Further, heat is transmitted from the light converging point up and down, and the refractive index fluctuations on the incident side curved surface 9 and the exit side curved surface 10 also easily occur. Therefore, the beam that strikes the light-receiving surface of the light-receiving element 2 spreads, so that the light-receiving element 2 can be prevented from malfunctioning. Other configurations and effects are similar to those of the second embodiment.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Light Receiving Elements (AREA)
Abstract
Description
図1は、実施の形態1に係る受光モジュールを示す断面図である。ステム1の上に受光素子2が設けられている。リード3がステム1を貫通し受光素子2に接続されている。鏡筒4が受光素子2を覆っている。鏡筒4にはレンズ5が取り付けられている。
図3は、実施の形態2に係る受光モジュールを示す断面図である。図4は、実施の形態2に係るレンズを示す断面図である。入射側曲面9は曲率半径0.5mmの半球である。出射側曲面10は曲率半径0.75mmの半球である。円筒部11の半径は1.5mm、全長は2mmである。レンズ5はTAF3など屈折率1.8の材料からなる。出射側曲面10の曲率中心は入射側曲面9の曲率中心に対してx方向に-0.14mmオフセットしている。x方向は光軸に対して垂直方向である。
図5は、実施の形態3に係るレンズを示す上面図である。光の入射側から見た平面視で入射側曲面9の半径よりも円筒部11の半径が大きいと、入射側曲面9の外側にもレンズ5の入射側端面が存在する。この部分に光が入ると、入射側曲面9を介さずにレンズ5を通過した光を受光素子2が検知するため、誤った位置に光ファイバスタブ7を固定する恐れがある。そこで、本実施の形態では、レンズ5の入射側端面において入射側曲面9の外側にクロム等の材料で遮光コーティング12を設けている。これにより、入射側曲面9から入った光だけがレンズ5から出射される。よって、受光モジュールを組み立てる際に光ファイバスタブ7の光軸調整の範囲が狭くなり光軸調整がしやすくなる。その他の構成及び効果は実施の形態2と同様である。
図6は、実施の形態4に係る受光モジュールを示す断面図である。図7は、実施の形態4に係るレンズを示す断面図である。レンズ5は4個の部品5a,5b,5c,5dに分けられている。部品5aは半径0.5mmの半球であり、入射側曲面9に対応する。部品5bは半径1.5mm、厚み0.5mmの円筒である。部品5cは半径0.5mm厚み1.5mmの円筒である。部品5b,5cは円筒部11に対応する。部品5dは半径0.75mmの半球であり、出射側曲面10に対応する。部品5dの中心は部品5aの中心に対してx方向に-0.14mmオフセットしている。部品5dの中心と部品5b,5cの中心は一致している。
Claims (6)
- 受光素子と、
光ファイバスタブを有するレセプタクルと、
入射側曲面と、出射側曲面と、前記入射側曲面と前記出射側曲面の間に設けられた円筒部とを有するレンズと、
前記レンズと前記光ファイバスタブが接触せず離れるように前記レセプタクルを保持するレセプタクルホルダとを備え、
前記光ファイバスタブを出た光が前記入射側曲面から前記レンズに入ると前記レンズの内部で集光してから再び広がり、前記出射側曲面から出た光が前記受光素子の受光面に集光されることを特徴とする受光モジュール。 - 前記入射側曲面と前記出射側曲面の曲率半径が異なり、曲率中心がずれていることを特徴とする請求項1に記載の受光モジュール。
- 前記レンズの入射側端面において前記入射側曲面の外側に設けられた遮光コーティングを更に備えることを特徴とする請求項2に記載の受光モジュール。
- 前記レンズの前記入射側曲面と前記出射側曲面と前記円筒部がそれぞれ別の部品に分けられ、各部品と同じ屈折率を持つ接着剤で互いに貼り合わされて一体化されていることを特徴とする請求項1~3の何れか1項に記載の受光モジュール。
- 前記円筒部の部品の温度に対する屈折率の変動量は前記入射側曲面の部品と前記出射側曲面の部品よりも大きいことを特徴とする請求項4に記載の受光モジュール。
- 前記円筒部の側面にくびれが設けられていることを特徴とする請求項1~5の何れか1項に記載の受光モジュール。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201880095958.XA CN112955799B (zh) | 2018-11-16 | 2018-11-16 | 感光模块 |
KR1020217004633A KR102620473B1 (ko) | 2018-11-16 | 2018-11-16 | 수광 모듈 |
JP2020556553A JP7160108B2 (ja) | 2018-11-16 | 2018-11-16 | 受光モジュール |
PCT/JP2018/042461 WO2020100283A1 (ja) | 2018-11-16 | 2018-11-16 | 受光モジュール |
US17/258,045 US11886025B2 (en) | 2018-11-16 | 2018-11-16 | Light-receiving module |
TW108139217A TWI687727B (zh) | 2018-11-16 | 2019-10-30 | 受光模組 |
Applications Claiming Priority (1)
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PCT/JP2018/042461 WO2020100283A1 (ja) | 2018-11-16 | 2018-11-16 | 受光モジュール |
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WO2020100283A1 true WO2020100283A1 (ja) | 2020-05-22 |
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US (1) | US11886025B2 (ja) |
JP (1) | JP7160108B2 (ja) |
KR (1) | KR102620473B1 (ja) |
CN (1) | CN112955799B (ja) |
TW (1) | TWI687727B (ja) |
WO (1) | WO2020100283A1 (ja) |
Cited By (1)
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WO2023276026A1 (ja) * | 2021-06-30 | 2023-01-05 | ナルックス株式会社 | 減衰領域を備えた光学素子及びその製造方法 |
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WO2020100283A1 (ja) * | 2018-11-16 | 2020-05-22 | 三菱電機株式会社 | 受光モジュール |
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2018
- 2018-11-16 WO PCT/JP2018/042461 patent/WO2020100283A1/ja active Application Filing
- 2018-11-16 CN CN201880095958.XA patent/CN112955799B/zh active Active
- 2018-11-16 JP JP2020556553A patent/JP7160108B2/ja active Active
- 2018-11-16 US US17/258,045 patent/US11886025B2/en active Active
- 2018-11-16 KR KR1020217004633A patent/KR102620473B1/ko active IP Right Grant
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2019
- 2019-10-30 TW TW108139217A patent/TWI687727B/zh active
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US11886025B2 (en) | 2024-01-30 |
JPWO2020100283A1 (ja) | 2021-09-24 |
TWI687727B (zh) | 2020-03-11 |
JP7160108B2 (ja) | 2022-10-25 |
CN112955799B (zh) | 2022-07-12 |
KR20210033500A (ko) | 2021-03-26 |
TW202020496A (zh) | 2020-06-01 |
CN112955799A (zh) | 2021-06-11 |
US20210286141A1 (en) | 2021-09-16 |
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