US20180335592A1 - Optical connector - Google Patents
Optical connector Download PDFInfo
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- US20180335592A1 US20180335592A1 US15/978,731 US201815978731A US2018335592A1 US 20180335592 A1 US20180335592 A1 US 20180335592A1 US 201815978731 A US201815978731 A US 201815978731A US 2018335592 A1 US2018335592 A1 US 2018335592A1
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- Prior art keywords
- optical
- light
- denoted
- output
- hole
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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
- 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
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
-
- 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
- G02B6/4246—Bidirectionally operating package structures
-
- 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
- G02B6/4256—Details of housings
-
- 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
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/389—Dismountable connectors, i.e. comprising plugs characterised by the method of fastening connecting plugs and sockets, e.g. screw- or nut-lock, snap-in, bayonet type
- G02B6/3893—Push-pull type, e.g. snap-in, push-on
Definitions
- the present invention relates to an optical connector.
- the optical fiber In the optical fiber, light that has entered a core propagates while repeating reflection at a boundary between the core and a clad.
- light with a large incident angle hereinafter, also referred to as “higher-order light”
- low-order light light with a small incident angle
- the higher-order light repeats reflection in the optical fiber a larger number of times
- the higher-order light has an optical path length longer than that of the low-order light. For example, if a refractive-index distribution of the core is made constant, speeds of light proceeding in the optical fiber become the same. Thus, there arises a difference between the higher-order light and the low-order light in propagation time of light from an entrance end to an exit end of the optical fiber.
- output light emitted from the optical fiber includes both higher-order light and low-order light that have a difference in propagation time. This causes such a problem that a waveform of an optical signal deteriorates, and high-speed communication cannot be achieved.
- a purpose of the present invention is to provide an optical connector that can achieve high-speed communication.
- an optical connector includes: an optical fiber; a light receiving member that is disposed to face an end surface in an optical axis direction of the optical fiber, and receives an output light emitted from the end surface; and an optical filter that is disposed between the end surface and the light receiving member, and includes a through-hole that transmits a part of the output light.
- FIG. 1 is a perspective view illustrating a schematic configuration of an optical connector according to an embodiment
- FIG. 2 is a perspective view illustrating a schematic configuration of the optical connector according to the embodiment
- FIG. 3 is a cross-sectional view illustrating a schematic configuration of the optical connector according to the embodiment
- FIG. 4 is a schematic diagram for describing a function of an optical filter according to the embodiment.
- FIG. 5 is a perspective view for describing a function of the optical filter according to the embodiment.
- FIG. 6 is diagram illustrating a distribution of maximum transmitted light output angles of transmitted light transmitted through the optical filter according to the embodiment.
- optical connector An embodiment of an optical connector according to the present invention will be described in detail below with reference to the drawings.
- present invention is not limited by the following embodiment.
- components in the following embodiment include the ones that can be replaced by those skilled in the art, and are easy, or the ones that are substantially identical.
- FIGS. 1 and 2 are perspective views illustrating a schematic configuration of an optical connector according to an embodiment.
- FIG. 3 is a cross-sectional view illustrating a schematic configuration of the optical connector according to the embodiment.
- FIG. 4 is a schematic diagram for describing a function of an optical filter according to the embodiment.
- FIG. 5 is a perspective view for describing a function of the optical filter according to the embodiment.
- FIG. 6 is diagram illustrating a distribution of maximum transmitted light output angles of transmitted light transmitted through the optical filter according to the embodiment.
- FIG. 1 illustrates an optical connector in a fitted state of a male connector and a female connector.
- FIG. 2 illustrates the optical connector in a non-fitted state of the male connector and the female connector.
- FIG. 3 is a cross-sectional view of an A-A cross section in FIG. 1 .
- a vertical axis indicates EAF (EAF: Encircled Angular Flux), and a horizontal axis indicates Angle [°].
- An optical connector 1 is mounted on a vehicle such as an automobile, for example, and connects an optical fiber used as a communication cable, and an electronic device.
- the optical connector 1 is formed by fitting a male connector 2 and a female connector 3 , and optically connects, by the fitting, a pair of optical fibers 4 connected to the male connector 2 , and an electronic device (not illustrated) connected to the female connector 3 .
- the male connector 2 includes the pair of optical fibers 4 , a pair of ferrules 21 , a housing 22 , and a spacer 23 .
- One of the pair of optical fibers 4 is for transmission and the other one is for reception.
- a plastic optical fiber (POF: Plastic Optical Fiber) that uses transparent plastic is used as the optical fibers 4 .
- the optical fibers 4 each have a structure in which a core wire called a core (core) 41 serving as a transmission path of light is surrounded by a clad (clad) 42 being made of the same material but having a different refractive index, and the clad is covered by a nontransparent protective coating 43 .
- An outer diameter A [mm] of the core 41 is about 0.9 mm to 1 mm, for example.
- the optical fibers 4 are formed of multi mode fibers (MMF: Multi Mode Fiber), for example.
- MMF Multi Mode Fiber
- the pair of ferrules 21 is formed of metal material, synthetic resin material, or the like, into a cylindrical shape, and has through-holes in an optical axis direction.
- the ferrules 21 are provided at leading ends of the optical fibers 4 as connecting end portions, and hold the optical fibers using the through-holes.
- the housing 22 is formed of insulating material such as synthetic resin, and has a substantially rectangular parallelepiped shape. A pair of through-holes penetrating in the optical axis direction is formed in the housing 22 , and the optical fibers 4 to which the ferrules 21 are attached are respectively inserted into the through-holes.
- the spacer 23 is formed of insulating material such as synthetic resin.
- the spacer 23 is provided separately from the housing 22 , and fixes the pair of optical fibers 4 to the housing 22 by assembling the pair of optical fibers 4 to the housing 22 .
- the female connector 3 includes a pair of FOTs 31 , a shield case 32 , an aligning plate 33 , a housing 34 , a lens unit 35 , and an optical filter 36 .
- the FOT 31 is made of synthetic resin and has a substantially rectangular parallelepiped shape, and has a built-in light-emitting element and a built-in light receiving element thereinside.
- the shield case 32 is formed as a hollow cover member having a substantially rectangular parallelepiped shape with two opened surfaces, by pressing a metal thin plate having electrical conductivity.
- the shield case 32 shields the pair of FOTs 31 by covering the peripheries of the pair of FOTs 31 so as not to leak electromagnetic wave noises to the outside.
- the aligning plate 33 is formed of insulating material such as synthetic resin, and on the inner side, has an internal space for accommodating the shield case 32 .
- the aligning plate 33 is latched to the housing 34 by a latch portion provided on the housing 34 side.
- the housing 34 is formed of insulating material such as synthetic resin, and has a substantially rectangular parallelepiped shape. In an internal space, the housing 34 has a pair of cylindrical sleeves 34 a for holding the pair of optical fibers 4 and the lens unit 35 .
- the lens unit 35 is made of transparent resin having optical characteristics by integrally forming a flat-plate substrate, and a pair of lenses 35 a vertically installed from the substrate.
- One of the pair of lenses 35 a is a light receiving member, and collects light from the optical fibers 4 to the light receiving elements of the FOTs 31 , and the other one collects light from the light-emitting elements of the FOTs 31 to the optical fiber 4 side.
- the optical filter 36 is formed of insulating material such as synthetic resin that does not pass optical signals in a wavelength band (e.g., 400 nm to 1800 nm) used by a general communication fiber, and disposed between end surfaces 4 a in the optical axis direction of the optical fibers 4 and the lenses 35 a.
- the optical filter 36 is disposed at a position distant from the end surface 4 a of the optical fiber 4 by a distance L [mm] in the optical axis direction.
- the optical filter 36 includes a through-hole 36 a that transmits part of output light, and has a ring shape when viewed from the optical axis direction.
- the shape of a cross section of the through-hole 36 a that is orthogonal to the optical axis direction is circular, and the through-hole 36 a has an inner diameter (diameter) B [mm].
- the optical filter 36 is fixed to inner peripheral surfaces of the sleeves 34 a of the housing 34 .
- the optical connector 1 preferably satisfies the following formulae (1) and (2).
- output light of the optical fiber 4 includes both higher-order light 51 and low-order light 52 .
- the higher-order light 51 is emitted at a large output angle
- the low-order light 52 is emitted at a small output angle.
- the output light of the optical fiber 4 reaches the lens 35 a of the lens unit 35 while spreading from the end surface 4 a toward the optical axis direction within a range of the maximum output angle ⁇ (2 ⁇ in reality) illustrated in FIG. 4 .
- the output light that has reached the lens 35 a is collected by the lens 35 a , and is emitted onto a light receiving surface of the FOT 31 having a built-in light receiving element.
- the optical filter 36 is disposed on an optical path between the end surface 4 a and the lens 35 a .
- the inner diameter B of the through-hole 36 a is defined by the above formula (1) based on the distance L, the outer diameter A of the core 41 , and the maximum transmitted light output angle ⁇ ′ of transmitted light that passes through the through-hole 36 a and has a smaller angle than the maximum output angle ⁇ of output light.
- the distance L is defined by the above formula (2) based on the outer diameter A of the core 41 and the maximum transmitted light output angle ⁇ ′.
- the optical filter 36 can block or reduce the transmission of the higher-order light 51 of the output light.
- the optical connector 1 includes the optical fibers 4 , the lenses 35 a that are disposed to face the end surfaces 4 a in the optical axis direction of the optical fibers 4 , and receive output light emitted from the end surfaces 4 a , and the optical filter 36 that is disposed between the end surfaces 4 a and the lenses 35 a , and includes the through-hole 36 a that transmits part of output light.
- the optical connector 1 according to the present embodiment can block or reduce the transmission of the higher-order light 51 from output light passing on the optical path between the end surfaces 4 a in the optical axis direction of the optical fibers 4 and the lenses 35 a of the lens unit 35 .
- deterioration of a waveform of an optical signal that is caused by mixture of the higher-order light 51 and the low-order light 52 can be reduced or suppressed, and high-speed communication can be achieved.
- the inner diameter B of the through-hole 36 a may be defined using a graph illustrated in FIG. 6 , for example.
- the EAF illustrated in FIG. 6 is a value obtained by integrating an intensity distribution of output angles of output light emitted from the end surfaces 4 a of the optical fibers 4 , toward a spreading direction of the output angles from the center.
- the EAF also increases in accordance with the increase in output angle.
- the EAF becomes 0.4 when the output angle is 10[°]
- the EAF becomes 0.84 when the output angle is 20[°]
- the inner diameter B of the through-hole 36 a of the present embodiment is preferably defined so that the maximum transmitted light output angle ⁇ ′ falls within a range corresponding to a shaded portion on the graph illustrated in FIG. 6 .
- the shape of the cross section of the through-hole 36 a that is orthogonal to the optical axis direction is circular.
- the shape is not limited to this.
- the cross-sectional shape may be an ellipse shape.
- part of an inner circumferential surface of the through-hole 36 a may have recesses and protrusions.
- the optical filter 36 is fixed to the inner peripheral surfaces of the sleeves 34 a of the housing 34 .
- the optical filter 36 may be formed integrally with the sleeves 34 a , or may have a configuration assembled to the sleeves 34 a as a separate member.
- the optical connector 1 has been described as connecting the optical fibers 4 and an electronic device. Nevertheless, the optical connector 1 is not limited to this, and the present invention may be applied to an optical connector that connects optical fibers.
- optical connector according to the present embodiment such an effect that high-speed communication can be achieved is caused.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
- The present application claims priority to and incorporates by reference the entire contents of Japanese Patent Application No. 2017-099707 filed in Japan on May 19, 2017.
- The present invention relates to an optical connector.
- In recent years, in a vehicle such as an automobile, high-speed communication is achieved by replacing a communication system provided between various electronic devices, with the one using an optical fiber (for example, Japanese Patent Application Laid-open No. 2002-23025).
- In the optical fiber, light that has entered a core propagates while repeating reflection at a boundary between the core and a clad. Among the light that propagates in the optical fiber, light with a large incident angle (hereinafter, also referred to as “higher-order light”) proceeds while being reflected at a high angle, whereas light with a small incident angle (hereinafter, also referred to as “low-order light”) proceeds while being reflected at a low angle. Because the higher-order light repeats reflection in the optical fiber a larger number of times, the higher-order light has an optical path length longer than that of the low-order light. For example, if a refractive-index distribution of the core is made constant, speeds of light proceeding in the optical fiber become the same. Thus, there arises a difference between the higher-order light and the low-order light in propagation time of light from an entrance end to an exit end of the optical fiber.
- As mentioned above, output light emitted from the optical fiber includes both higher-order light and low-order light that have a difference in propagation time. This causes such a problem that a waveform of an optical signal deteriorates, and high-speed communication cannot be achieved.
- A purpose of the present invention is to provide an optical connector that can achieve high-speed communication.
- According to one aspect of the present invention, an optical connector includes: an optical fiber; a light receiving member that is disposed to face an end surface in an optical axis direction of the optical fiber, and receives an output light emitted from the end surface; and an optical filter that is disposed between the end surface and the light receiving member, and includes a through-hole that transmits a part of the output light. When an inner diameter of the through-hole is denoted by B, a distance from the end surface to the optical filter in the optical axis direction is denoted by L, a maximum transmitted light output angle of a transmitted light that passes through the through-hole and has a smaller angle than a maximum output angle α of the output light is denoted by α′, and an outer diameter of a core of the optical fiber is denoted by A, following formulae (1) and (2) are satisfied.
-
B=2×L×tan α′−A (1) -
L>A/tan α′/2 (2) - The above and other objects, features, advantages and technical and industrial significance of this invention will be better understood by reading the following detailed description of presently preferred embodiments of the invention, when considered in connection with the accompanying drawings.
-
FIG. 1 is a perspective view illustrating a schematic configuration of an optical connector according to an embodiment; -
FIG. 2 is a perspective view illustrating a schematic configuration of the optical connector according to the embodiment; -
FIG. 3 is a cross-sectional view illustrating a schematic configuration of the optical connector according to the embodiment; -
FIG. 4 is a schematic diagram for describing a function of an optical filter according to the embodiment; -
FIG. 5 is a perspective view for describing a function of the optical filter according to the embodiment; and -
FIG. 6 is diagram illustrating a distribution of maximum transmitted light output angles of transmitted light transmitted through the optical filter according to the embodiment. - An embodiment of an optical connector according to the present invention will be described in detail below with reference to the drawings. In addition, the present invention is not limited by the following embodiment. In addition, components in the following embodiment include the ones that can be replaced by those skilled in the art, and are easy, or the ones that are substantially identical.
-
FIGS. 1 and 2 are perspective views illustrating a schematic configuration of an optical connector according to an embodiment.FIG. 3 is a cross-sectional view illustrating a schematic configuration of the optical connector according to the embodiment.FIG. 4 is a schematic diagram for describing a function of an optical filter according to the embodiment.FIG. 5 is a perspective view for describing a function of the optical filter according to the embodiment.FIG. 6 is diagram illustrating a distribution of maximum transmitted light output angles of transmitted light transmitted through the optical filter according to the embodiment. In addition,FIG. 1 illustrates an optical connector in a fitted state of a male connector and a female connector.FIG. 2 illustrates the optical connector in a non-fitted state of the male connector and the female connector.FIG. 3 is a cross-sectional view of an A-A cross section inFIG. 1 . InFIG. 6 , a vertical axis indicates EAF (EAF: Encircled Angular Flux), and a horizontal axis indicates Angle [°]. - An
optical connector 1 according to the present embodiment is mounted on a vehicle such as an automobile, for example, and connects an optical fiber used as a communication cable, and an electronic device. As illustrated inFIGS. 1 and 2 , theoptical connector 1 is formed by fitting amale connector 2 and afemale connector 3, and optically connects, by the fitting, a pair ofoptical fibers 4 connected to themale connector 2, and an electronic device (not illustrated) connected to thefemale connector 3. - As illustrated in
FIG. 3 , themale connector 2 includes the pair ofoptical fibers 4, a pair offerrules 21, ahousing 22, and aspacer 23. - One of the pair of
optical fibers 4 is for transmission and the other one is for reception. For example, a plastic optical fiber (POF: Plastic Optical Fiber) that uses transparent plastic is used as theoptical fibers 4. Theoptical fibers 4 each have a structure in which a core wire called a core (core) 41 serving as a transmission path of light is surrounded by a clad (clad) 42 being made of the same material but having a different refractive index, and the clad is covered by a nontransparentprotective coating 43. An outer diameter A [mm] of thecore 41 is about 0.9 mm to 1 mm, for example. Theoptical fibers 4 are formed of multi mode fibers (MMF: Multi Mode Fiber), for example. - The pair of
ferrules 21 is formed of metal material, synthetic resin material, or the like, into a cylindrical shape, and has through-holes in an optical axis direction. Theferrules 21 are provided at leading ends of theoptical fibers 4 as connecting end portions, and hold the optical fibers using the through-holes. - The
housing 22 is formed of insulating material such as synthetic resin, and has a substantially rectangular parallelepiped shape. A pair of through-holes penetrating in the optical axis direction is formed in thehousing 22, and theoptical fibers 4 to which theferrules 21 are attached are respectively inserted into the through-holes. - Similarly to the
housing 22, thespacer 23 is formed of insulating material such as synthetic resin. Thespacer 23 is provided separately from thehousing 22, and fixes the pair ofoptical fibers 4 to thehousing 22 by assembling the pair ofoptical fibers 4 to thehousing 22. - The
female connector 3 includes a pair ofFOTs 31, ashield case 32, analigning plate 33, ahousing 34, alens unit 35, and anoptical filter 36. - One of the pair of fiber optic transceivers (FOTs) 31 is for transmission and the other one is for reception. The
FOT 31 is made of synthetic resin and has a substantially rectangular parallelepiped shape, and has a built-in light-emitting element and a built-in light receiving element thereinside. - The
shield case 32 is formed as a hollow cover member having a substantially rectangular parallelepiped shape with two opened surfaces, by pressing a metal thin plate having electrical conductivity. Theshield case 32 shields the pair ofFOTs 31 by covering the peripheries of the pair ofFOTs 31 so as not to leak electromagnetic wave noises to the outside. - The aligning
plate 33 is formed of insulating material such as synthetic resin, and on the inner side, has an internal space for accommodating theshield case 32. The aligningplate 33 is latched to thehousing 34 by a latch portion provided on thehousing 34 side. - The
housing 34 is formed of insulating material such as synthetic resin, and has a substantially rectangular parallelepiped shape. In an internal space, thehousing 34 has a pair ofcylindrical sleeves 34 a for holding the pair ofoptical fibers 4 and thelens unit 35. - The
lens unit 35 is made of transparent resin having optical characteristics by integrally forming a flat-plate substrate, and a pair oflenses 35 a vertically installed from the substrate. One of the pair oflenses 35 a is a light receiving member, and collects light from theoptical fibers 4 to the light receiving elements of theFOTs 31, and the other one collects light from the light-emitting elements of theFOTs 31 to theoptical fiber 4 side. - The
optical filter 36 is formed of insulating material such as synthetic resin that does not pass optical signals in a wavelength band (e.g., 400 nm to 1800 nm) used by a general communication fiber, and disposed betweenend surfaces 4 a in the optical axis direction of theoptical fibers 4 and thelenses 35 a. Theoptical filter 36 is disposed at a position distant from theend surface 4 a of theoptical fiber 4 by a distance L [mm] in the optical axis direction. Theoptical filter 36 includes a through-hole 36 a that transmits part of output light, and has a ring shape when viewed from the optical axis direction. The shape of a cross section of the through-hole 36 a that is orthogonal to the optical axis direction is circular, and the through-hole 36 a has an inner diameter (diameter) B [mm]. Theoptical filter 36 is fixed to inner peripheral surfaces of thesleeves 34 a of thehousing 34. - Next, a function of the
optical connector 1 will be described. As illustrated inFIG. 4 , when an inner diameter of the through-hole 36 a is denoted by B, a distance from theend surface 4 a to theoptical filter 36 in the optical axis direction is denoted by L, a maximum transmitted light output angle of transmitted light that passes through the through-hole 36 a and has a smaller angle than a maximum output angle α[°] of output light is denoted by α′[°], and an outer diameter of thecore 41 of theoptical fiber 4 is denoted by A, theoptical connector 1 preferably satisfies the following formulae (1) and (2). -
B=2×L×tan α′−A (1) -
L>A/tan α′/2 (2) - As illustrated in
FIG. 5 , output light of theoptical fiber 4 includes both higher-order light 51 and low-order light 52. Thus, the higher-order light 51 is emitted at a large output angle, and the low-order light 52 is emitted at a small output angle. In other words, the output light of theoptical fiber 4 reaches thelens 35 a of thelens unit 35 while spreading from theend surface 4 a toward the optical axis direction within a range of the maximum output angle α (2α in reality) illustrated inFIG. 4 . The output light that has reached thelens 35 a is collected by thelens 35 a, and is emitted onto a light receiving surface of theFOT 31 having a built-in light receiving element. In theoptical connector 1 of the present embodiment, theoptical filter 36 is disposed on an optical path between theend surface 4 a and thelens 35 a. By using the through-hole 36 a of theoptical filter 36, part of the optical path is shielded, and part of output light is transmitted. The inner diameter B of the through-hole 36 a is defined by the above formula (1) based on the distance L, the outer diameter A of the core 41, and the maximum transmitted light output angle α′ of transmitted light that passes through the through-hole 36 a and has a smaller angle than the maximum output angle α of output light. The distance L is defined by the above formula (2) based on the outer diameter A of thecore 41 and the maximum transmitted light output angle α′. In this manner, by the inner diameter B of the through-hole 36 a and the distance L in the optical axis direction from theend surface 4 a to theoptical filter 36 satisfying the above formulae (1) and (2), theoptical filter 36 can block or reduce the transmission of the higher-order light 51 of the output light. - As described above, the
optical connector 1 according to the present embodiment includes theoptical fibers 4, thelenses 35 a that are disposed to face the end surfaces 4 a in the optical axis direction of theoptical fibers 4, and receive output light emitted from the end surfaces 4 a, and theoptical filter 36 that is disposed between the end surfaces 4 a and thelenses 35 a, and includes the through-hole 36 a that transmits part of output light. When an inner diameter of the through-hole 36 a of theoptical filter 36 is denoted by B, a distance from theend surface 4 a to theoptical filter 36 in the optical axis direction is denoted by L, a maximum transmitted light output angle of transmitted light that passes through the through-hole 36 a and has a smaller angle than a maximum output angle α of output light is denoted by α′, and an outer diameter of thecore 41 of theoptical fiber 4 is denoted by A, the following formulae (1) and (2) are satisfied. -
B=2×L×tan α′−A (1) -
L>A/tan α′/2 (2) - The
optical connector 1 according to the present embodiment that has the above configuration can block or reduce the transmission of the higher-order light 51 from output light passing on the optical path between the end surfaces 4 a in the optical axis direction of theoptical fibers 4 and thelenses 35 a of thelens unit 35. Thus, deterioration of a waveform of an optical signal that is caused by mixture of the higher-order light 51 and the low-order light 52 can be reduced or suppressed, and high-speed communication can be achieved. - In addition, in the above embodiment, the inner diameter B of the through-
hole 36 a may be defined using a graph illustrated inFIG. 6 , for example. The EAF illustrated inFIG. 6 is a value obtained by integrating an intensity distribution of output angles of output light emitted from the end surfaces 4 a of theoptical fibers 4, toward a spreading direction of the output angles from the center. In the graph illustrated inFIG. 6 , the EAF also increases in accordance with the increase in output angle. For example, in the graph illustrated inFIG. 6 , the EAF becomes 0.4 when the output angle is 10[°], the EAF becomes 0.84 when the output angle is 20[°], and the EAF becomes about 1.0 when the output angle is 30[°]. The inner diameter B of the through-hole 36 a of the present embodiment is preferably defined so that the maximum transmitted light output angle α′ falls within a range corresponding to a shaded portion on the graph illustrated inFIG. 6 . - In addition, in the above embodiment, the shape of the cross section of the through-
hole 36 a that is orthogonal to the optical axis direction is circular. The shape, however, is not limited to this. For example, the cross-sectional shape may be an ellipse shape. In addition, part of an inner circumferential surface of the through-hole 36 a may have recesses and protrusions. - In addition, in the above embodiment, the
optical filter 36 is fixed to the inner peripheral surfaces of thesleeves 34 a of thehousing 34. Nevertheless, theoptical filter 36 may be formed integrally with thesleeves 34 a, or may have a configuration assembled to thesleeves 34 a as a separate member. - In addition, in the above embodiment, the
optical connector 1 has been described as connecting theoptical fibers 4 and an electronic device. Nevertheless, theoptical connector 1 is not limited to this, and the present invention may be applied to an optical connector that connects optical fibers. - According to the optical connector according to the present embodiment, such an effect that high-speed communication can be achieved is caused.
- Although the invention has been described with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the basic teaching herein set forth.
Claims (1)
B=2×L×tan α′−A (1)
L>A/tan α′/2 (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2017-099707 | 2017-05-19 | ||
JP2017099707A JP2018194723A (en) | 2017-05-19 | 2017-05-19 | Optical connector |
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Publication Number | Publication Date |
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US10133015B1 US10133015B1 (en) | 2018-11-20 |
US20180335592A1 true US20180335592A1 (en) | 2018-11-22 |
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Application Number | Title | Priority Date | Filing Date |
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US15/978,731 Expired - Fee Related US10133015B1 (en) | 2017-05-19 | 2018-05-14 | Optical connector |
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US (1) | US10133015B1 (en) |
JP (1) | JP2018194723A (en) |
CN (1) | CN108957644A (en) |
DE (1) | DE102018207499A1 (en) |
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JP7102377B2 (en) * | 2019-08-27 | 2022-07-19 | 矢崎総業株式会社 | Optical connector |
CN112925065B (en) * | 2019-12-05 | 2022-08-30 | 苏州长光华芯光电技术股份有限公司 | Optical fiber space filter |
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US4381137A (en) * | 1981-03-05 | 1983-04-26 | Hydroacoustics Inc. | Optical fiber mode separation systems |
US4942623A (en) * | 1983-06-16 | 1990-07-17 | Trw Inc. | Device and method for modal separation and combination in an optical fiber intrusion detection system |
USH491H (en) * | 1987-10-23 | 1988-07-05 | The United States Of America As Represented By The Secretary Of The Army | Fiber optic attenuator |
US5243681A (en) * | 1992-04-13 | 1993-09-07 | Amp Incorporated | Aperture disk attenuator for laser diode connector |
JPH10117012A (en) * | 1996-10-11 | 1998-05-06 | Sumitomo Electric Ind Ltd | Semiconductor light-receiving element |
JPH10170774A (en) * | 1996-12-10 | 1998-06-26 | Showa Electric Wire & Cable Co Ltd | Light shield member for optical fiber |
JP3682140B2 (en) * | 1997-02-28 | 2005-08-10 | 三菱レイヨン株式会社 | Increasing the amount of information transmitted in an optical fiber |
US6404951B2 (en) * | 1998-03-26 | 2002-06-11 | Lasercomm Inc. | Transverse spatial mode transformer for optical communication |
WO2000017691A1 (en) * | 1998-09-17 | 2000-03-30 | Matsushita Electric Industrial Co., Ltd. | Coupling lens and semiconductor laser module |
JP2002023025A (en) | 2000-07-07 | 2002-01-23 | Yazaki Corp | Optical connector |
JP3950362B2 (en) * | 2001-09-27 | 2007-08-01 | シャープ株式会社 | Optical communication system |
JP2005165088A (en) * | 2003-12-04 | 2005-06-23 | Nec Compound Semiconductor Devices Ltd | Optical semiconductor device |
JP2005328301A (en) * | 2004-05-13 | 2005-11-24 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber transmission system and optical relaying apparatus used for system |
US7242835B2 (en) * | 2005-07-18 | 2007-07-10 | The United States Of America As Represented By The Secretary Of The Navy | Optical fiber clad-protective terminations |
KR100643466B1 (en) * | 2005-09-27 | 2006-11-10 | 엘지전자 주식회사 | Silicon optical bench and light source of laser display having the same |
US8218928B2 (en) * | 2009-04-23 | 2012-07-10 | Ofs Fitel, Llc | Spatial filtering of higher order modes in multimode fibers |
JP2012150002A (en) * | 2011-01-19 | 2012-08-09 | Nippon Telegr & Teleph Corp <Ntt> | Cutoff wavelength measuring method, operation mode determination method and apparatus for the methods |
FR2974638B1 (en) * | 2011-04-26 | 2013-11-29 | Meggitt France | LIGHT ENERGY TRANSMISSION DEVICE AND TRANSMISSION METHOD THEREOF |
US9110246B2 (en) * | 2013-05-29 | 2015-08-18 | Ipg Photonics Corporation | High power spatial filter |
CN203415817U (en) * | 2013-08-28 | 2014-01-29 | 上海高意激光技术有限公司 | Semiconductor laser with soft edge aperture filter |
JP2017099707A (en) | 2015-12-02 | 2017-06-08 | 長田電機工業株式会社 | Dental instrument |
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- 2017-05-19 JP JP2017099707A patent/JP2018194723A/en not_active Abandoned
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- 2018-05-15 DE DE102018207499.2A patent/DE102018207499A1/en not_active Withdrawn
- 2018-05-17 CN CN201810474667.3A patent/CN108957644A/en active Pending
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JP2018194723A (en) | 2018-12-06 |
CN108957644A (en) | 2018-12-07 |
DE102018207499A1 (en) | 2018-11-22 |
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