CN113508323B - Optical receptacle and optical module - Google Patents
Optical receptacle and optical module Download PDFInfo
- Publication number
- CN113508323B CN113508323B CN202080017272.6A CN202080017272A CN113508323B CN 113508323 B CN113508323 B CN 113508323B CN 202080017272 A CN202080017272 A CN 202080017272A CN 113508323 B CN113508323 B CN 113508323B
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- optical
- receptacle
- optical surface
- photoelectric conversion
- conversion element
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The purpose of the present invention is to provide an optical receptacle capable of expanding the allowable range of misalignment (misalignment tolerance range) between a photoelectric conversion element and the optical receptacle. The optical receptacle is disposed between the photoelectric conversion element and the optical transmission body, and includes: a first optical surface; a second optical surface; and a third optical surface and a fourth optical surface arranged so as to face each other on an optical path between the first optical surface and the second optical surface. The third optical surface or the fourth optical surface is a lens surface.
Description
Technical Field
The present invention relates to an optical receptacle and an optical module having the same.
Background
Conventionally, an optical module including a light Emitting element such as a Surface Emitting Laser (for example, a VCSEL) is used for optical communication using an optical transmission medium such as an optical fiber or an optical waveguide. The optical module has an optical receptacle for allowing light including communication information emitted from the light emitting element to enter an end surface of the optical transmission body.
For example, patent document 1 discloses an optical receptacle capable of allowing light emitted from a light emitting element to enter an end face of an optical fiber through the optical receptacle.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open publication No. 2013-137507
Disclosure of Invention
Problems to be solved by the invention
In recent years, the capacity of information transmitted and received in optical communication has been increased, and the size of an optical module used in optical communication has been reduced. In such a case, when the optical receptacle is assembled into an optical module, if the light emitting element and the optical receptacle are displaced from each other, an extreme output reduction may occur.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an optical receptacle capable of enlarging an allowable range of misalignment (misalignment tolerance range) between a photoelectric conversion element and the optical receptacle.
Means for solving the problems
An optical receptacle of the present invention is arranged between a photoelectric conversion element and an optical transmission body, and optically couples the photoelectric conversion element and an end surface of the optical transmission body, and includes: a first optical surface on which light emitted from the photoelectric conversion element is incident or from which light emitted from an end surface of the optical transmission body and passing through the inside of the optical receptacle is emitted toward the photoelectric conversion element; a second optical surface that emits light emitted from the photoelectric conversion element and passing through the inside of the optical receptacle to the optical transmission body, or that allows light emitted from the optical transmission body to enter; and a third optical surface and a fourth optical surface that are disposed so as to face each other on an optical path between the first optical surface and the second optical surface, the third optical surface emitting light incident from the first optical surface to the outside of the optical receptacle or emitting light incident from the fourth optical surface to the outside of the optical receptacle, the fourth optical surface emitting light incident from the second optical surface to the outside of the optical receptacle or emitting light incident from the third optical surface to the outside of the optical receptacle to the inside of the optical receptacle, and the third optical surface or the fourth optical surface being a lens surface.
The optical module of the present invention has one or more photoelectric conversion elements and the optical receptacle of the present invention.
Effects of the invention
According to the present invention, it is possible to provide an optical receptacle capable of expanding an allowable range of misalignment (misalignment tolerance range) between a photoelectric conversion element and the optical receptacle.
Drawings
Fig. 1 is a cross-sectional view of an optical module according to an embodiment of the present invention.
Fig. 2A and 2B are perspective views of the optical receptacle according to the embodiment of the present invention.
Fig. 3A and 3B are graphs showing a part of a cross section of a lens surface used in the simulation on the XY plane.
Fig. 4 is a graph showing the results of the simulation.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings.
(Structure of optical Module)
Fig. 1 is a cross-sectional view of an optical module 10 according to an embodiment of the present invention. In fig. 1, hatching of the cross section of each component is omitted to show the optical path. The single-dashed line indicates the optical axis LA of the light beam and the dashed line indicates the outer edge of the light beam.
As shown in fig. 1, the optical module 10 has a photoelectric conversion element 21 and an optical receptacle 30. The optical module 10 is used in a state where the optical transmission body 50 is connected to the optical receptacle 30 through the ferrule.
When the optical module 10 is a transmission optical module, the photoelectric conversion element 21 is a light emitting element that emits light to the optical receptacle 30. The light emitted from the light emitting element passes through the inside of the optical receptacle 30 and reaches the end surface 23 of the optical transmission body 50. The kind of the light emitting element is not particularly limited. The light emitting element is, for example, a Vertical Cavity Surface Emitting Laser (VCSEL).
On the other hand, when the optical module 10 is a receiving optical module, the photoelectric conversion element 21 is a light receiving element that detects light emitted from the end surface 23 of the optical transmission body 50 and passing through the inside of the optical receptacle 30. The kind of the light receiving element is not particularly limited. The light receiving element is, for example, a Photodiode (PD).
The number of the photoelectric conversion elements 21 is not particularly limited, and may be one or more. When the number of the photoelectric conversion elements 21 is plural, the plural photoelectric conversion elements 21 may be arranged in one row, or may be arranged in two or more rows. In the present embodiment, the number of the photoelectric conversion elements 21 is one.
The optical receptacle 30 is disposed between the photoelectric conversion element 21 and the optical transmission body 50, and optically couples the photoelectric conversion element 21 and the end surface 23 of the optical transmission body 50. The optical receptacle 30 has optical transparency, and allows light emitted from the photoelectric conversion element 21 or the optical transmission body 50 to enter. The optical receptacle 30 is formed using a material having optical transparency to light of a wavelength used in optical communication. Examples of such materials include transparent resins such as Polyetherimide (PEI) and cyclic olefin resins. In addition, the optical receptacle 30 is manufactured, for example, by injection molding. The structure of the optical receptacle 30 will be described in additional detail.
The optical transports 50 are connected to the optical receptacle 30 by ferrules. The kind of the optical transports 50 is not particularly limited. Examples of the optical transmission body 50 include an optical fiber, an optical waveguide. The fiber may be either single mode or multimode. The number of the optical transmission bodies 50 is not particularly limited, and may be one or a plurality of. Generally, the number of the photoelectric conversion elements 21 is the same as the number of the optical transports 50. In the present embodiment, the optical transmission body 50 is one optical fiber. In the case where the number of the optical transmission bodies 50 is plural, the plural optical transmission bodies 50 may be arranged in one row, or may be arranged in two or more rows.
(Structure of optical receptacle)
Fig. 2A and 2B are perspective views of the optical receptacle 30 of the embodiment of the present invention. Fig. 2A shows the optical receptacle 30 in which the third optical surface 33 described later is a lens surface, and fig. 2B shows the optical receptacle 30 in which the fourth optical surface 34 described later is a lens surface.
As shown in fig. 1, 2A, and 2B, the optical receptacle 30 includes: a first optical surface 31, a second optical surface 32, a third optical surface 33, a fourth optical surface 34, and a reflective surface 35.
The first optical surface 31 is disposed so as to face the photoelectric conversion element 21, and allows light emitted from the photoelectric conversion element (light-emitting element) 21 to enter, or allows light emitted from the end surface 23 of the optical transmission member 50 and passing through the inside of the optical receptacle 30 to exit to the photoelectric conversion element (light-receiving element) 21. In the present embodiment, the first optical surface 31 is a convex lens surface that is disposed on the lower surface side of the optical receptacle 30 and is convex toward the photoelectric conversion element 21. In the present embodiment, the first optical surface 31 converts light emitted from the photoelectric conversion element (light emitting element) 21 into collimated light, or condenses light that has passed through the inside of the optical receptacle 30 toward the photoelectric conversion element (light receiving element) 21.
The number of the first optical surfaces 31 is not particularly limited, and may be one or more. In the present embodiment, the number of the first optical surfaces 31 is one. When a plurality of photoelectric conversion elements 21 are arranged in a row, the same number of first optical surfaces 31 as the number of the photoelectric conversion elements 21 may be arranged in a row. When the photoelectric conversion elements 21 are arranged in two or more rows, the first optical surfaces 31 may be arranged in the same number of rows.
The second optical surface 32 is disposed so as to face the end surface 23 of the optical transmission body 50, and allows light emitted from the photoelectric conversion element 21 and passing through the inside of the optical receptacle 30 to be emitted toward the optical transmission body 50 or light emitted from the optical transmission body 50 to be incident thereon. In the present embodiment, the second optical surface 32 is a convex lens surface disposed on the front side of the optical receptacle 30 and protruding toward the optical transmission body 50. In the present embodiment, the second optical surface 32 condenses the light passing through the inside of the optical receptacle 30 toward the end surface 23 of the optical transmission body 50, or converts the light emitted from the end surface 23 of the optical transmission body 50 into collimated light.
The number of the second optical surfaces 32 is not particularly limited, and may be one or more. In the present embodiment, the number of the second optical surfaces 32 is one. In addition, when a plurality of optical transmission bodies 50 are arranged in a row, the same number of second optical surfaces 32 as the optical transmission bodies 50 may be arranged in a row. When the optical transmission bodies 50 are arranged in two or more rows, the second optical surfaces 32 may be arranged in the same number of rows.
The third optical surface 33 and the fourth optical surface 34 are disposed so as to face each other on the optical path between the first optical surface 31 and the second optical surface 32. In the present embodiment, a substantially quadrangular frustum-shaped recess is formed so as to be open at the top surface of the optical receptacle 30 and intersect the optical path between the first optical surface 31 and the second optical surface 32. Two surfaces opposed to each other among the five surfaces constituting the concave portion intersect the optical path between the first optical surface 31 and the second optical surface 32. Of these two surfaces, a region intersecting the optical path on a surface close to the first optical surface 31 (reflection surface 35) side is the third optical surface 33; the area intersecting the optical path on the face on the side close to the second optical surface 32 is the fourth optical surface 34. The third optical surface 33 and the fourth optical surface 34 face each other with a space (air) in the recess interposed therebetween. The shape of the recess is not particularly limited, and may be, for example, a substantially rectangular parallelepiped.
The third optical surface 33 allows light incident from the first optical surface 31 to exit to the outside of the optical receptacle 30, or allows light exiting from the fourth optical surface 34 to exit to the outside of the optical receptacle 30 to enter to the inside of the optical receptacle 30. In the present embodiment, the third optical surface 33 emits light emitted from the photoelectric conversion element 21, incident on the optical receptacle 30 from the first optical surface 31, and reflected by the reflection surface 35 to the outside of the optical receptacle 30. Alternatively, in the present embodiment, the third optical surface 33 causes light emitted from the end surface 23 of the optical transmission body 50 to enter the optical receptacle 30 through the second optical surface 32, and causes light emitted from the fourth optical surface 34 to the outside of the optical receptacle 30 to enter the inside of the optical receptacle 30. Light incident into the light receptacle 30 from the third optical surface 33 is directed towards the reflective surface 35.
The fourth optical surface 34 allows light incident from the second optical surface 32 to exit the optical receptacle 30, or allows light exiting from the third optical surface 33 to enter the optical receptacle 30. In the present embodiment, the fourth optical surface 34 emits light that exits from the end surface 23 of the optical transmission body 50 and enters the optical receptacle 30 through the second optical surface 32 to the outside of the optical receptacle 30. Alternatively, in the present embodiment, the fourth optical surface 34 allows light emitted from the photoelectric conversion element 21 to enter the optical receptacle 30 through the first optical surface 31, to be reflected by the reflection surface 35, and to exit the optical receptacle 30 through the third optical surface 33 to enter the optical receptacle 30. Light incident into the light receptacle 30 from the fourth optical surface 34 is directed toward the second optical surface 32.
In the optical receptacle 30 of the present embodiment, at least one of the third optical surface 33 and the fourth optical surface 34 is a lens surface (see fig. 2A and 2B). Here, the lens surface means a non-planar surface. The lens surface may be spherical or aspherical. In a case where the light reaching the lens surface is deviated from a desired position, it is preferable that the peripheral portion of the lens surface be inclined so that the light is refracted (condensed) toward the center side, from the viewpoint of controlling the traveling direction of the light so that the light approaches the desired position. On the other hand, the central portion of the lens surface does not need to refract (condense) light toward the central side, and therefore may be a flat surface or a concave surface.
As shown in fig. 2A and 2B, the third optical surface 33 or the fourth optical surface 34 is a lens surface, and preferably, the lens surface has a central portion having a rotationally symmetric shape including a surface having an inclination of-0.5 ° or more and 0 ° or less with respect to a virtual reference plane perpendicular to an axis of symmetry thereof, and a peripheral portion disposed around the central portion and including a surface having an inclination of 0.3 ° or more and 3 ° or less with respect to the virtual reference plane. Here, the inclination (angle) at a specific point of the lens surface is a positive value (more than 0 °) when the lens surface is inclined so that the axis of symmetry at the center portion of the lens surface is closer to the concave portion, and a negative value (less than 0 °) when the lens surface is inclined so that the axis of symmetry at the center portion of the lens surface is farther from the concave portion. For example, when the entire lens surface is a convex lens, the inclination of the lens surface at each point is a positive value (more than 0 °). When the entire lens surface is a concave lens, the inclination at each point of the lens surface is a negative value (less than 0 °).
As shown in fig. 2A, when the third optical surface 33 is a lens surface, the lens surface has a shape in which a line shown in the XY plane of fig. 3A is rotated around the Y axis, for example. In the XY plane, the upper side is the concave portion (fourth optical surface 34) side, and the lower side is the reflection surface 35 side. That is, the lens protrudes toward the concave portion side. On the other hand, as shown in fig. 2B, when the fourth optical surface 34 is a lens surface, the lens surface has a shape in which a line shown in the XY plane of fig. 3B is rotated around the Y axis, for example. In the XY plane, the upper side is the concave portion (third optical surface 33) side, and the lower side is the second optical surface 32 side. That is, the lens surface also protrudes toward the recess side.
The third optical surface 33 and the fourth optical surface 34 shown in fig. 3A and 3B have a substantially truncated cone shape. The top surface (upper bottom) of the truncated cone corresponds to the central portion, and the side surface of the truncated cone corresponds to the peripheral portion. The lens surface has such a shape that light passing through the central portion of the lens surface travels straight along the optical axis and light passing through the peripheral portion of the lens surface is refracted so as to approach the optical axis. When the position of the light flux reaching the lens surface is shifted, the light flux passing through the central portion of the lens surface decreases, the light flux passing through the peripheral portion of the lens surface increases, and the light flux passing through the peripheral portion of the lens surface is refracted so as to approach the optical axis, so that the position of the light flux is corrected. In this way, by forming at least one of the third optical surface 33 and the fourth optical surface 34 as a lens surface having a predetermined shape, even when the position of the optical receptacle 30 is shifted with respect to the photoelectric conversion element 21, the position of the light flux traveling in the optical receptacle 30 can be corrected. As a result, the tolerance range of the misalignment of the optical receptacle 30 with respect to the photoelectric conversion element 21 can be expanded.
The lens surface is preferably set to have a size in a direction perpendicular to the optical axis (central axis) in the central portion and the peripheral portion. Specifically, the position and size of the central portion of the lens surface are preferably set so that the entire light flux passes through the central portion of the lens surface without displacement of the light flux. In addition, it is preferable that the position and size of the peripheral portion of the lens surface are set such that the outer edge portion of the light flux passes through the peripheral portion of the lens surface when the light flux is shifted.
The reflecting surface 35 reflects light incident from the first optical surface 31 toward the third optical surface 33, or reflects light incident from the third optical surface 33 toward the first optical surface 31.
In the present embodiment, the reflecting surface 35 is disposed on the top surface side of the optical receptacle 30, and is inclined so as to be distant from the optical transmission body 50 as it approaches the bottom surface from the top surface of the optical receptacle 30. In the present embodiment, the reflecting surface 35 has a flat shape. The inclination angle of the reflecting surface 35 is not particularly limited as long as the light incident from the first optical surface 31 can be reflected toward the third optical surface 33. In the present embodiment, the inclination angle of the reflecting surface 35 is set so as to totally reflect the light incident from the first optical surface 31.
(simulation)
In the optical module 10 of the present embodiment, a simulation was performed on a change in coupling efficiency between the photoelectric conversion element 21 and the optical transmission body 50 when the photoelectric conversion element 21 was moved from a position of maximum coupling efficiency in a direction perpendicular to the optical axis with respect to the optical receptacle 30.
Fig. 4 is a graph showing a simulation result. The horizontal axis represents the amount of movement of the photoelectric conversion element 21, and the vertical axis represents the change in maximum coupling efficiency. The solid line represents the simulation result of the optical receptacle (comparative example) in which the third optical surface 33 and the fourth optical surface 34 are flat. The broken line is a simulation result of the optical receptacle 30 (example 1) in which the third optical surface 33 is a lens surface having the shape shown in fig. 3A. The chain line is a simulation result of the optical receptacle 30 (example 2) in which the fourth optical surface 34 is a lens surface having the shape shown in fig. 3B.
As is clear from fig. 4, when the third optical surface 33 or the fourth optical surface 34 is a lens surface, the decrease in coupling efficiency is suppressed even if the photoelectric conversion element 21 and the optical receptacle 30 are misaligned.
Specifically, when the misalignment range between the photoelectric conversion element 21 and the optical receptacle 30 in which the reduction in coupling efficiency is 0.50dB or less is defined as a "misalignment tolerance range", the misalignment tolerance range is about 0.02mm in the optical receptacle of the comparative example. On the other hand, in the optical sockets of embodiments 1 and 2 in which the third optical surface 33 or the fourth optical surface 34 is set as a lens surface, the misalignment tolerance range is expanded to 0.027mm.
(Effect)
As described above, the optical receptacle 30 of the present invention has a larger tolerance range of misalignment than the conventional optical receptacle. Therefore, by using the optical receptacle 30 of the present invention, the high-performance optical module 10 can be manufactured at low cost.
The present application claims priority based on japanese patent application No. 2019-041656, filed on 3/7/2019. The contents described in the specification and drawings are all incorporated in the specification of the present application.
Industrial applicability
The optical receptacle and the optical module according to the present invention are useful for optical communication using an optical transmission medium, for example.
Description of the reference numerals
10. Optical module
21. Photoelectric conversion element
23. End face
30. Optical receptacle
31. First optical surface
32. Second optical surface
33. Third optical surface
34. Fourth optical surface
35. Reflecting surface
50. Optical transmission body
LA optical axis
Claims (3)
1. An optical receptacle, which is disposed between a photoelectric conversion element and an optical transmission body, for optically coupling the photoelectric conversion element and an end surface of the optical transmission body, the optical receptacle comprising:
a first optical surface on which light emitted from the photoelectric conversion element is incident or from which light emitted from an end surface of the optical transmission body and passing through the inside of the optical receptacle is emitted toward the photoelectric conversion element;
a second optical surface that emits light emitted from the photoelectric conversion element and passing through the inside of the optical receptacle to the optical transmission body or that allows light emitted from the optical transmission body to enter; and
a third optical surface and a fourth optical surface arranged so as to face each other on an optical path between the first optical surface and the second optical surface,
the third optical surface allows light incident from the first optical surface to exit to the outside of the optical receptacle or allows light exiting from the fourth optical surface to enter to the inside of the optical receptacle,
the fourth optical surface allows light incident from the second optical surface to exit to the outside of the optical receptacle or allows light exiting from the third optical surface to enter to the inside of the optical receptacle,
the third optical surface or the fourth optical surface is a lens surface,
the lens surface has a central portion having a rotationally symmetrical shape and a peripheral portion disposed around the central portion,
the central portion includes a plane having an inclination of-0.5 DEG or more and 0 DEG or less with respect to a virtual reference plane perpendicular to a symmetry axis of the central portion,
the peripheral portion includes a surface having an inclination of 0.3 ° or more and 3 ° or less with respect to the virtual reference surface.
2. The optical receptacle of claim 1,
the optical device further includes a reflecting surface that reflects the light incident from the first optical surface toward the third optical surface or reflects the light incident from the third optical surface toward the first optical surface.
3. An optical module, comprising:
one or more photoelectric conversion elements and the optical receptacle according to claim 1 or 2.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-041656 | 2019-03-07 | ||
| JP2019041656A JP7312576B2 (en) | 2019-03-07 | 2019-03-07 | Optical receptacles and optical modules |
| PCT/JP2020/008021 WO2020179615A1 (en) | 2019-03-07 | 2020-02-27 | Optical receptacle and optical module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113508323A CN113508323A (en) | 2021-10-15 |
| CN113508323B true CN113508323B (en) | 2023-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080017272.6A Active CN113508323B (en) | 2019-03-07 | 2020-02-27 | Optical receptacle and optical module |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7312576B2 (en) |
| CN (1) | CN113508323B (en) |
| WO (1) | WO2020179615A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6856717B2 (en) * | 2003-03-24 | 2005-02-15 | Hymite A/S | Package with a light emitting device |
| JP2006064885A (en) * | 2004-08-25 | 2006-03-09 | Nippon Telegr & Teleph Corp <Ntt> | Optical module and its manufacturing method |
| CN101079535A (en) * | 2006-05-23 | 2007-11-28 | 精工爱普生株式会社 | Optical module |
| JP2013164497A (en) * | 2012-02-10 | 2013-08-22 | Enplas Corp | Lens array and optical module provided with the same |
| JP5896136B2 (en) | 2012-03-05 | 2016-03-30 | 株式会社エンプラス | Optical receptacle and optical module having the same |
| JP6117396B1 (en) * | 2016-03-16 | 2017-04-19 | 株式会社フジクラ | Ferrule with optical fiber and manufacturing method of ferrule with optical fiber |
| US9766416B1 (en) * | 2016-09-12 | 2017-09-19 | Yottahn, Inc. | Optical module and method of manufacturing the same |
| US9645331B1 (en) * | 2016-09-12 | 2017-05-09 | Yottahn, Inc. | Optical module device and method of manufacturing the same |
-
2019
- 2019-03-07 JP JP2019041656A patent/JP7312576B2/en active Active
-
2020
- 2020-02-27 CN CN202080017272.6A patent/CN113508323B/en active Active
- 2020-02-27 WO PCT/JP2020/008021 patent/WO2020179615A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020179615A1 (en) | 2020-09-10 |
| CN113508323A (en) | 2021-10-15 |
| JP7312576B2 (en) | 2023-07-21 |
| JP2020144265A (en) | 2020-09-10 |
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