CN109188621A - A kind of multimode fibre coupled system - Google Patents
A kind of multimode fibre coupled system Download PDFInfo
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- CN109188621A CN109188621A CN201811156529.7A CN201811156529A CN109188621A CN 109188621 A CN109188621 A CN 109188621A CN 201811156529 A CN201811156529 A CN 201811156529A CN 109188621 A CN109188621 A CN 109188621A
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- multimode fibre
- optical fiber
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- lens
- light source
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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
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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
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A kind of multimode fibre coupled system, belongs to lighting technical field.System includes laser light source, coupled lens, multimode fibre；The coupled lens are set between the laser light source and multimode fibre, its one end connecting with the coupled lens of the multimode fibre is equipped with optical fiber collimator；At least one end in the light inlet of the coupled lens and out light end has free form surface, the light inlet when light end is with free form surface out and has at least one free form surface, so that the light for the different angle that laser light source issues is coupled into the optical fiber collimator of the multimode fibre through the coupled lens；Light coupling into optical fiber collimator enters multimode fibre and pools a focal line at core centre axis.The high power laser illumination that the present invention is suitable for transmitting at a distance improves the upper limit of the power of fiber coupling transmission using the optical fiber collimator of coupled lens and multimode fibre, solves the problems, such as that alignment precision requirement is high, packaging cost is high, coupling efficiency is low.
Description
Technical field
The present invention relates to lighting technical field more particularly to a kind of multimode fibre coupled systems for illumination.
Background technique
Currently, Fibre Optical Communication Technology has been mature on the whole in communication technique field, and optical fiber light-guiding, which is applied to illumination, is
The new development direction of optical fiber light-guiding technology.Optical fiber light-guiding illumination is a kind of light-guide illumination mode of photodetachment, and optical fiber light-guiding shines
Bright output end does not have any electrical equipment, therefore in the place with fire, explosive gas, it is also the light of a safety
Source.Existing fiber light-guide illumination obtains more application in some low power decorative lightings, signal lamp and endoscope, and
High-power illumination field still has many difficulties and makes it difficult to large-scale promotion.
The existing coupled lens system applied to light-guide illumination includes LED light source, plastic optical fiber, coupled lens.LED light source
Light emitting angle is big, and the light issued slightly converges close to the part of primary optical axis via coupled lens (generally simple convex lens)
On fiber end face, the light coupling for meeting numerical aperture enters optical fiber for transmission after poly-, and is propagated in the form of being totally reflected.The coupling
Closing lens system, there are following technical problems:
1, LED light source light-emitting area is big (square millimeter magnitude), and dispersion angle is big (180 ° * 90 °), and the energy at unit space angle is close
It spends low；Plastic optical fiber 1 ~ 5mm of diameter, compared to LED light source, fibre diameter is small；The practical angle managed of general coupled lens
Very little.For this purpose, the light that LED light source issues, mainly can be coupled into optical fiber close to some light of primary optical axis.If meeting
LED light source luminous characteristics improve coupling efficiency, need to increase fibre diameter, and optical fiber cost can increase with diameter and be in multiple
Increase.
2, the light of different angle can be pooled one by spherical shape, spherical lens mostly on general coupled lens its surface
A focus makes in optical fiber in energy single point set, and single-point energy is excessively high to lead to the easy scorification of optical fiber.In addition the material heatproof of plastic optical fiber
Property comparison is poor, and plastic optical fiber is easier to scorification.
3, plastic optical fiber end face processing is difficult, once end plane angle deviation or surface flatness are inadequate, will lead on end face
A large amount of fibre scattering is caused, coupling efficiency is low.
4, the transmission loss of plastic optical fiber is too big, and import optical fiber is in 150Db/km or so, and domestic optical fiber is in 250Db/km
Left and right, light in a fiber can not high-transmission efficiency and short range transmission at low cost, can not also transmit at a distance, let alone remote
Meet high-transmission efficiency and low cost when Distance Transmission simultaneously.
Utility model patent CN205137223 discloses a kind of laser without electric lighting system, and specifically discloses system packet
Include blue light LD, coupling mirror, focus lamp, optical fiber coupling head, optical fiber.The laser that blue light LD is issued has certain angle of divergence, needs to couple
It penetrates into row and collects collimation, the laser beam after collimation is converged in optical fiber coupling head using focus lamp then, passes through fiber coupling
In head coupled into optical fibres.Although caused by the system solves the problems, such as LED light source luminous characteristics using blue light LD, this is
There are still following problems for system: firstly, lens used in the system are gone out using spherical mirror and traditional convex lens, noise spectra of semiconductor lasers
The light angle of divergence has higher requirements, and needing to increase lens for special-shaped laser light source can be only achieved required effect, thus can only be directed to
The laser for once being encapsulated and being collimated is crossed to use from laser diode；And it is deposited by once encapsulating the laser diode collimated
Actually going out the low defect of photoelectricity light conversion efficiency；In addition, light is a focus by spherical mirror convergence, lead to energy on optical fiber
Amount dispersion is uneven and reduces the upper limit of the power of fiber coupling transmission.Secondly, the system needs high light source, lens, light
The alignment precision of fine main shaft, packaging cost are high.Then, the fibre diameter that the system uses is larger, and optical fiber is at high cost, and engineering is applied
Work requires high；And optical fiber power-off coupling loss is larger, needs to re-lay whole route if occurring many places breakpoint in route,
Maintenance cost is higher.
Summary of the invention
In view of the problems of the existing technology the present invention, proposes a kind of coupling efficiency height, high reliablity, efficiency of transmission
Height, and the multimode fibre coupled system for being suitable for transmitting at a distance.
The technical scheme is that:
A kind of multimode fibre coupled system of the present invention, including laser light source, coupled lens, multimode fibre；The coupled lens are set
Between the laser light source and the multimode fibre, its one end connecting with the coupled lens of the multimode fibre is equipped with light
Fine collimator；At least one end in the light inlet of the coupled lens and out light end has free form surface, the light inlet or institute
When stating out light end with free form surface and there is at least one free form surface, so that the light for the different angle that laser light source issues
The optical fiber collimator of the multimode fibre is coupled into through the coupled lens；Into the optical fiber collimator light coupling into
Enter multimode fibre and pools a focal line at core centre axis.
Preferably, the coupled lens are the single couplings being made of at least one free form surface and at least one secondary surface
Close lens.
Preferably, the coupled lens meet nonimaging optics method and following equation groups design:
WhereinFor a kind of distribution curve flux of special-shaped light source,Indicate the space angular dimensions of light source luminescent face hemisphere,For the Energy distribution of target,The position of target point in space has been determined,Indicate optical operator,Respectively indicate refractive index and free form surface.Indicate target energy point
Mapping relations between cloth and light source light distribution curve meetPrimary optical axis be aligned coincidence relation andThe constraint of energy conservation relation；
According to special-shaped direction mapping relations, one of ODE, cutting-out method, streamline method, SMS method in nonimaging optics is selected to ask
Special-shaped indicatrix；
Free form surface is generated according to special-shaped indicatrix according to tensor product method construct.
Preferably, the laser light source is semiconductor laser or optical fiber laser.
Preferably, laser light source light type is fast and slow axis abnormal shape light type.
Preferably, the multimode fibre is one of core diameter 50um, 62.5um, 100um optical fiber.
Preferably, the multimode fibre refractive index is step change type or gradient type.
Preferably, the optical fiber collimator is the optical fiber collimator with C-lens or G-lens condenser lens.
Preferably, the laser light source, the coupled lens are with the optical fiber collimator after being aligned along central optical axis
Encapsulation is fixedly connected with by fixture.
The invention has the following advantages:
A kind of multimode fibre coupled system of the present invention substitutes LED light source using laser light source, solves LED light source luminous characteristics
Caused by the low problem of coupling efficiency；Using with free form surface structure coupled lens and optical fiber collimator light source issued
Light uniformly converges on optical fiber at focal line mode, avoids optical fiber energy distribution uneven and reduces on the power of fiber coupling transmission
Limit；The alignment precision requirement of system is reduced using optical fiber collimator, and preferably improves optical fiber reliability using multimode fibre.This
Invention system is suitable for the high-power light-guide illumination transmitted at a distance, solves existing coupled system alignment precision height, is packaged into
The high problem of this height, maintenance cost, improves coupling efficiency.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of multimode fibre coupled system of the present invention；
Fig. 2 is a kind of package structure diagram of multimode fibre coupled system of the present invention.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Fig. 1 shows a kind of multimode fibre coupled system of the present invention, and system includes laser light source 1, coupled lens 2, multimode
Optical fiber 4.The coupled lens 2 are set between the laser light source 1 and the multimode fibre 4.The laser light source 1, the coupling
Close lens 2, the multimode fibre 4 is connected by optical path.One end that the multimode fibre 4 connects the coupled lens 2 is equipped with light
Fine collimator 3.The coupled lens 2 of light for the different angle that the laser light source issues are coupled into the optical fiber of multimode fibre 4
Collimator 3.The light coupling for entering the optical fiber collimator 3 is entered multimode fibre 4 by the optical fiber collimator 3.
The light for the different angle that laser light source issues is coupled into the optical fiber of the multimode fibre through the coupled lens
Collimator, the light coupling into the optical fiber collimator enter multimode fibre and pool a coke at core centre axis
Line.
The laser light source 1 can be semiconductor laser or optical fiber laser.The laser light source light type is fast and slow axis
Special-shaped light type.Laser light source light-emitting area very little (100 square micron magnitude), dispersion angle it is small (30 ° ~ 60 ° of fast axle, 6 ° of slow axis ~
15 °), energy density is big.Compared to LED light source, the luminous energy that laser light source issues effectively is coupled into optical fiber, coupling efficiency
It is high.
At least one end in the light inlet of the coupled lens 2 and out light end has free form surface, when the light inlet and
When any end in light end has free form surface out, and there is at least one free form surface.Fig. 1,2 show 21 and of light inlet
Light end 22 is respectively provided with a free form surface, merely illustrative explanation in figure, however it is not limited to such situation out.It may also comprise, entering light
End has a free form surface, and light end is plane out；Or it is on the contrary；Further include light inlet or light end has more than one freedom out
Situations such as curved surface.The coupled lens design cycle is as follows:
WhereinFor a kind of distribution curve flux of special-shaped light source,Indicate the space angular dimensions of light source luminescent face hemisphere,For the Energy distribution of target,The position of target point in space has been determined,Indicate optical operator,Respectively indicate refractive index and free form surface.Indicate target energy distribution with
Mapping relations between light source light distribution curve, meet primary optical axis alignment coincidence relation andEnergy
Measure the constraint of Conservation Relationship；
According to special-shaped direction mapping relations, one of ODE, cutting-out method, streamline method, SMS method in nonimaging optics is selected to ask
Special-shaped indicatrix；
Free form surface is generated according to special-shaped indicatrix according to tensor product method construct.
In case where shown in Fig. 1,2, the coupled lens are by least one free form surface and at least one auxiliary
The single coupled lens that face is constituted.Light inlet 21 and out light end 22 are respectively provided with a free form surface.Determine matching for abnormal shape light source
Light curve then obtains light inlet and out light end free form surface.
The light inlet free form surface is to use nonimaging optics design method, such as ODE, cutting-out method, streamline method, SMS,
Go out two one-dimensional optical surface indicatrixes that light rim ray obtains light inlet according to light source levels axis and vertical axis, then
Two one-dimensional optical surface indicatrixes are merged into acquisition by tensor product mode；
The coupled lens with free form surface structure obtained using the above method, the light that can issue laser light source is with certain
Angle is coupled into optical fiber collimator, is coupled into multimode fibre via condenser lens.It is different from the focus that collimation coupling is formed,
The light coupling of different angle is pooled multiple focuses simultaneously into multimode fibre by condenser lens, and different focuses is linked to be a coke
Line, making the distribution of energy in a fiber is uniformly, to improve the upper limit of the power of fiber coupling transmission.The coupled lens use
Optical glass is selected, precision is high, and light transmittance is high.
Described its material of multimode fibre 4 be general quartz glass, optical fiber core diameter have 50/62.5/100 μm it is several, it is single can
About 50W power is born, transmission loss is low, typically about 10 ~ 30dB/km or so.The multimode fibre refractive index be step change type or
Gradient type.
Described 4 one end of multimode fibre with coupled lens 2 for connecting, and to couple light rays into optical fiber, and the other end is used for
Connect lamp cap.The laser light source 1, the coupled lens 2 and the optical fiber collimator 3 along central optical axis after aligned by folder
Tool is fixedly connected with encapsulation.The coupled lens 2 are connect with the multimode fibre 4 by optical fiber collimator 3.The multimode fibre 4
For the optical fiber with optical fiber collimator.Preferably, optical fiber collimator is that the optical fiber with C-lens or G-lens condenser lens is quasi-
Straight device.Existing fiber collimator 3, which has been directed to multimode fibre, have been done and has designed on optical fiber align, and it is quasi- to directly adopt dismountable optical fiber
Straight device 3 is connected between multimode fibre 4 and coupled lens 2, reduces the required precision being coupled and aligned, so that connection is easier.
Fig. 2 shows a kind of encapsulating structures of multimode fibre coupled system of the invention, and encapsulating structure of the present invention is without being limited thereto,
Explanation is only described using Fig. 2 as example.A kind of multimode fibre coupled system is encapsulated using system stationary positioned fastener, and system is fixed
Positioning buckling element 5 includes positioning buckling element 1 and positioning buckling element 2 52.The positioning buckling element 1 is used for fixed laser light source 1 and coupling
It closes lens 2 and positions alignment system spindle, the positioning buckling element 2 52 is for fixed coupling lens 2 and optical fiber collimator 3 and determines
Position alignment system spindle.The positioning buckling element 1 is connected with the positioning buckling element 52 and stationary positioned coupled lens 2.It utilizes
Above-mentioned optical fiber collimator 3 connects multimode fibre and coupled lens, and combines the encapsulating structure, and energy is easy, precisely aligns, and encapsulates
It is easy and at low cost.
Example 1: laser light source is semiconductor laser, which issues special-shaped light light shape out, horizontal axis light
Beam diffusion, the convergence of vertical axis light beam.Multimode fibre 4 uses 62.5 μm of core diameter of multimode fibre.Multimode fibre collimator 3
Using C-lens optical fiber collimator.The design method combined using the ODE in non-imaged design method with SMS is according to light source water
Flat axis and vertical axis go out two one-dimensional optical surface indicatrixes that light rim ray obtains light inlet, utilize tensor later
Long-pending mode merges into light inlet free form surface 21.Plain edge edge is gone out according to light source levels axis and vertical axis using same method
Light obtains out two one-dimensional optical surface indicatrixes at light end, merges into out light end freedom in the way of tensor product later
Curved surface 22.Under this multimode fibre coupled system, the light of different angle pools a focal line in optical fiber, and transmission loss 10 ~
30dB/km。
Example 2: laser light source is semiconductor laser, which issues special-shaped light light shape out, horizontal axis light
Beam diffusion, the convergence of vertical axis light beam.Multimode fibre 4 uses 62.5 μm of core diameter of multimode fibre.Optical fiber collimator 3 uses G-
Lens optical fiber collimator.
The design method combined using the ODE in non-imaged design method with SMS is according to light source levels axis and vertical axis
Light-emitting directions rim ray obtains two one-dimensional optical surface indicatrixes of light inlet, is merged in the way of tensor product later
For light inlet free form surface 21.Go out light rim ray according to light source levels axis and vertical axis using same method and obtain out light
Two one-dimensional optical surface indicatrixes at end, merge into out light end free form surface 22 in the way of tensor product later.Herein
Under multimode fibre coupled system, the light of different angle pools a focal line, 10 ~ 30dB/km of transmission loss in optical fiber.
The applicable remote transmission of present system, especially greater than 100 meters of remote transmission, transmission loss is small, at
This is low.
It should be understood by those skilled in the art that foregoing description and the embodiment of the present invention shown in the drawings are only used as illustrating
And it is not intended to limit the present invention.The purpose of the present invention completely effectively realizes.Function and structural principle of the invention is in reality
It applies and shows and illustrate in example, under without departing from the principle, embodiments of the present invention can have any deformation or modification.
Claims (9)
1. a kind of multimode fibre coupled system, which is characterized in that including laser light source, coupled lens, multimode fibre；The coupling
Lens are set between the laser light source and the multimode fibre, its one end for connecting with the coupled lens of the multimode fibre
Equipped with optical fiber collimator；At least one end in the light inlet of the coupled lens and out light end has free form surface, the entering light
End when light end is with free form surface out and has at least one free form surface, so that the light of the different angle of laser light source sending
Line is coupled into the optical fiber collimator of the multimode fibre through the coupled lens；Into the light coupling of the optical fiber collimator
A focal line is pooled into multimode fibre and at core centre axis.
2. a kind of multimode fibre coupled system according to claim 1, which is characterized in that the coupled lens are by least
The single coupled lens that one free form surface and at least one secondary surface are constituted.
3. a kind of multimode fibre coupled system according to claim 2, which is characterized in that the coupled lens meet it is non-at
As optical means and following equation groups design:
WhereinFor a kind of distribution curve flux of special-shaped light source,Indicate the space angular dimensions of light source luminescent face hemisphere,For the Energy distribution of target,The position of target point in space has been determined,Indicate optical operator,Refractive index and free form surface are respectively indicated,Indicate target energy point
Mapping relations between cloth and light source light distribution curve meetPrimary optical axis be aligned coincidence relation andThe constraint of energy conservation relation；
According to special-shaped direction mapping relations, one of ODE, cutting-out method, streamline method, SMS method in nonimaging optics is selected to ask
Special-shaped indicatrix；
Free form surface is generated according to special-shaped indicatrix according to tensor product method construct。
4. a kind of multimode fibre coupled system according to claim 1, which is characterized in that the laser light source is semiconductor
Laser or optical fiber laser.
5. a kind of multimode fibre coupled system according to claim 4, which is characterized in that the laser light source light type is fast
Slow axis abnormal shape light type.
6. a kind of multimode fibre coupled system according to claim 1, which is characterized in that the multimode fibre is that fibre core is straight
One of diameter 50um, 62.5um, 100um optical fiber.
7. a kind of multimode fibre coupled system according to claim 6, which is characterized in that the multimode fibre refractive index is
Step change type or gradient type.
8. a kind of multimode fibre coupled system according to claim 6, which is characterized in that the optical fiber collimator be with
The optical fiber collimator of C-lens or G-lens condenser lens.
9. a kind of multimode fibre coupled system according to claim 1, which is characterized in that the laser light source, the coupling
It closes lens and is being fixedly connected with encapsulation after aligned by fixture along central optical axis with the optical fiber collimator.
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| CN2018109921664 | 2018-08-29 | ||
| CN201810992166 | 2018-08-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594700A (en) * | 2019-09-06 | 2019-12-20 | 浙江光塔节能科技有限公司 | Laser light-emitting device |
| CN112379483A (en) * | 2020-11-27 | 2021-02-19 | 北京航天控制仪器研究所 | Large-view-field high-efficiency optical fiber coupling system |
| CN114397759A (en) * | 2022-01-28 | 2022-04-26 | 天津凌视科技有限公司 | Passive laser homogenizing device and flow type microscopic high-speed imaging system |
| CN114839721A (en) * | 2022-04-15 | 2022-08-02 | 苏州苏驼通信科技股份有限公司 | Light coupling adapter, method and device and electronic equipment |
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| US20060056762A1 (en) * | 2003-07-02 | 2006-03-16 | Honeywell International Inc. | Lens optical coupler |
| CN101566710A (en) * | 2008-04-23 | 2009-10-28 | 一品光学工业股份有限公司 | Aspheric fiber coupling lens |
| US20160011387A1 (en) * | 2014-07-11 | 2016-01-14 | Nobuyuki Arai | Laser device |
| CN107544101A (en) * | 2017-08-31 | 2018-01-05 | 重庆光遥光电科技有限公司 | It is a kind of to be used for LD and the single non-spherical lens of fiber coupling |
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| CN1540382A (en) * | 2003-06-24 | 2004-10-27 | S・朱塔莫利亚 | Fiber-coupled laser diode having high coupling-efficiency and low feedbck noise |
| US20060056762A1 (en) * | 2003-07-02 | 2006-03-16 | Honeywell International Inc. | Lens optical coupler |
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| CN112379483A (en) * | 2020-11-27 | 2021-02-19 | 北京航天控制仪器研究所 | Large-view-field high-efficiency optical fiber coupling system |
| CN114397759A (en) * | 2022-01-28 | 2022-04-26 | 天津凌视科技有限公司 | Passive laser homogenizing device and flow type microscopic high-speed imaging system |
| CN114839721A (en) * | 2022-04-15 | 2022-08-02 | 苏州苏驼通信科技股份有限公司 | Light coupling adapter, method and device and electronic equipment |
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