CN1412602A - Laser collimator for free space optical connection - Google Patents
Laser collimator for free space optical connection Download PDFInfo
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- CN1412602A CN1412602A CN 01135801 CN01135801A CN1412602A CN 1412602 A CN1412602 A CN 1412602A CN 01135801 CN01135801 CN 01135801 CN 01135801 A CN01135801 A CN 01135801A CN 1412602 A CN1412602 A CN 1412602A
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Abstract
The laser collimator for implementing light connection by means of air free space has the function of expanding diameter of bean come from tail end of monomode fibre. Said optical fibre is light-connected with semiconductor laser diode, and can send a beam of low dispersion collimated expanded light beam. Besides, said invention also designs a method for increasing divergence of light cone coming from optical fibre head so as to make laser collimator have large expansion rate in the compact structure.
Description
Invention field
The present invention uses and relates to optical beam expander or collimating element, and they are used to expand the beam diameter of self-excitation light source and this light beam is launched with the form of directional light.
Background of invention
Except that optical fiber, also can provide the communication channel of high bandwidth with the form that free space optical connects.If adopt rigid line optical fiber to connect, its installation cost can be very high, and the form that adopts free space optical to connect, its installation cost just reduces greatly, as this connection is installed between two adjacent skyscrapers in the city sizable cost advantage is just arranged.The enforcement that free space optical connects requires transmitter to launch a branch of wide diameter, the low light beam of dispersing, and as several centimetres wide light beam, this light beam is easy to be launched out and mate with the receiver that is connected to an in addition individual end.
Generally speaking, the diameter of the light that sends of lasing light emitter is less.Like this, the light that needs to use a kind of optical beam expander or laser aligner that lasing light emitter is sent becomes major diameter, the low light of dispersing, and wherein this light is fully parallel.The present invention relates to the improvement design of these laser aligners.
Need to consider following factor in the design laser aligner process: at first, need to use a light source and a semiconductor laser, and this semiconductor laser is optically coupled in a single-mode fiber by optical fiber head.What do not have that the semiconductor laser of optical fiber head sends is only very unfavorable.Because the height asymmestry section that the semiconductor laser medium has width to differ greatly, its output is only oval-shaped and this light beam is very strong dispersing of laser medium plane normal direction.
Secondly, have optical fiber head laser instrument output only the cross section be the circular light beam of gaussian intensity face and dispersing of its light beam fully by limit angles θ
ConfinementDecision, θ
ConfinementEqual arccos (n
Clad/ n
Core), wherein, n
CoreAnd n
CladIt is respectively the refractive index of single-mode fiber fibre core and covering.
Once more, in optical fiber communication was used, this laser instrument was produced in batches, and therefore, in the facility of space, it can provide low-cost, high-quality light source.In addition, lasing light emitter requires to work in the 1500nm wavelength zone.At this wavelength zone, by the restriction of the laser power of timing monitoring safety standard setting much larger than the laser power restriction that works in shorter wavelength.At last, come laser beam is led in order in receiver, to be installed in optical controller, require laser aligner be a kind of simple, structure closely and the lighter device of weight.
The diagram brief introduction
With reference to the accompanying drawing of optimizing concrete device, below with the present invention will be described in detail.Accompanying drawing is as follows:
Fig. 1 is a kind of design drawing of laser aligner;
Fig. 2 is the synoptic diagram of the laser aligner that designs according to the present invention;
Fig. 3 is the enlarged drawing of laser aligner mounting bush among Fig. 2;
Fig. 4 is another the concrete device or the importation diagram of the laser aligner that designs according to the present invention;
Fig. 5 is another the concrete device or the importation diagram of the laser aligner that designs according to the present invention;
Fig. 6 is a concrete device or the importation diagram again of the laser aligner that designs according to the present invention; Describe in detail
Fig. 1 represents a kind of design of laser aligner.A column collimating apparatus holder 105a is fixed therein an optical fiber head 200 securely, and this optical fiber head comprises a kapillary 201 and the optical fiber 101 that is positioned at kapillary.The end of collimating apparatus holder 105a has a cylindrical hole, and the head 102 of the optical fiber 101 of optical fiber head 200 inserts and is fixed in wherein, and at the other end of 105a another cylindrical hole is arranged, and a plano-convex lens 106a is mounted in it.
The central shaft of the central shaft of lens 106a and optical fiber 101 is on the same line, and optical fiber pigtail 102 is positioned at the focus place of lens 106a.The light that optical fiber pigtail 102 sends becomes the taper diverging light, as shown in the figure.The light cone half-angle is determined by Optical Fiber Numerical Aperture.If the optical fiber that adopts is standard single-mode fiber, then this half-angle should be the 10-12 degree.This light cone drops on plano-convex lens 106a and goes up and be refracted into the bigger parallel beam of diameter.The diameter of this light beam is determined by the half-angle of distance between lens 106a and optical fiber end and light cone.
In laser aligner design shown in Figure 1, the end face of optical fiber head need be cut a smooth plane surface, but it is not vertical with fiber axis.The flat surfaces of this optical fiber head beveled end becomes 82 degree angles usually with fiber axis.The end face of optical fiber head is not cut into the reason of fiber axis vertical plane and is: if make this end face vertical with fiber axis, the Fresnel back reflected laser of laser at glass-air interface place can be coupled back laser instrument and influence laser works.
This angled end face can produce following negative effect.At first, light cone can depart from make its axis no longer with the axis of optical fiber-lens on same straight line.In Fig. 1, this departs from and shows as light beam and upwards depart from.This result who departs from generation is that this plano-convex lens 106a processes more complicated and much expensive than simple plano-convex lens lens 106 as shown in Figure 2.Owing to only utilized the part of lens, thereby need be when being positioned on the axis when the light cone required lens of lens 106a are much bigger.The flat surfaces of plano-convex lens 106a not with the lens axis normal, but made it become 82 to spend angles with the lens axis by mill.
Next must be installed in lens 106a in the collimating apparatus holder and orientation makes its surface parallel with fiber cut face shown in Figure 1.Another shortcoming is: it is not directional light along optical fiber-lens axis direction that the light wave of scioptics reflects into a branch of direction.This feature of this collimating apparatus makes that the aligning of light path is difficult more between transmitter and receiver.At last, the light of scioptics will produce a bigger spherical aberration through near the time rims of the lens, this means that size at receiver place focal beam spot is than ideally big.
One object of the present invention: design a kind of laser diode that has optical fiber head, it is characterized in that: the direction of divergent beams is consistent with the collimating apparatus optical axis, and can reduce the spherical aberration by the generation of collimating apparatus light beam.
Another object of the present invention: propose a kind of method with the light cone half-angle of increase, thereby in shorter length collimating apparatus, realize bigger outgoing beam diameter from optical fiber head light.
The present invention proposes a kind of method that overcomes several shortcomings of above-mentioned laser aligner design shown in Figure 1.As Fig. 2, the collimating apparatus 100 that designs according to the present invention has the collimating apparatus holder 105 of a column.One end of holder 105 has a circular hole, and column mounting bush 103 inserts wherein.Two elements are arranged in the sleeve pipe 103: an optical fiber head 200 and a wedge shape glass rod light transmission component 104, this inserts and does not almost see through luminous power in the glass rod 104.
The manufacture process of optical fiber head 200 normally be bonded at a bare fibre 101 in the kapillary 201 and polish kapillary 201 and optical fiber pigtail 102 make its form 1 the degree the angles of wedge.Optical fiber head 200 can be bought from Fujian Huake Photoelectric Co., Ltd., and the said firm can provide multiple different fiber, is included in single-mode fiber of working in the 1550nm wavelength etc.
Laser diode (not marking among Fig. 2) and the connection of optical fiber head 200 be by with the single-mode fiber of the single-mode fiber 101 of optical fiber head 200 and laser diode mutually welding realize, do not mark among Fig. 2.The other end at collimating apparatus holder 105 has the bigger hole of another diameter, and a plano-convex lens 106 is mounted in it.The axis of the axis of lens 106 and optical fiber 101 is on same line, and lens focus just in time drops on the end of optical fiber pigtail 102.
Fig. 3 is the enlarged drawing of the mounting bush 103 of collimating apparatus.The refractive index of the glass rod 104 that inserts and the refractive index n of fibre core
CoreEquate.An end face of glass rod 104 is worn into the plane surface that becomes 82 degree angles with its axis.The other end of glass rod 104 is flat and its surface becomes an angle of 90 degrees with fiber axis.Glass rod 104 is contained in the mounting bush 103 and carries out orientation has the end face of the angle of wedge and optical fiber pigtail 102 to have the end face of the angle of wedge to be meshed so that insert glass rod 104, then, glass rod 104 is pushed in the middle of the sleeve pipe 103 of collimating apparatus, like this, terminal and insert between excellent 102 ends and can form a little air-gap at optical fiber pigtail 102, as shown in Figure 3.
The light cone of the light that 104 pairs of optical fiber pigtail 102 1 ends of glass rod send departs from the effect that can play rectification.In this air-gap, refraction still can take place and make it the stray fiber direction of principal axis in the light cone of the light that optical fiber pigtail 102 sends, but because air-gap is very narrow, dispersing light cone can not propagate too far away before refraction for the second time takes place at glass rod 104 first surface places, like this, dispersing departing from of light cone has obtained rectification, thereby makes its axis parallel with shaft axis of optic fibre (being the collimating apparatus axis).
Because air-gap is very narrow, so come the bias of light cone of autocollimator optical axis direction very little.Like this, in glass rod 104, light is θ with the half-angle
ConfinementThe light cone form of (limit angles of single-mode fiber) is still propagated along the collimating apparatus optical axis direction.Concerning typical single-mode fiber 101, θ
ConfinementBe generally 8 degree.When dispersing the output terminal of light cone by glass rod 104, this light cone will take place to reflect again, and it makes the half-angle of dispersing light cone increase to θ
Acceptance=arcsin (n
CoreXsin θ
Confinement).θ
AcceptanceThe reception half-angle that also is called single-mode fiber, it is generally 12 degree.
The light of optical fiber pigtail 102 outgoing can be at optical fiber head-air-gap interface 107, on the glass-air output terminal interface 109 of air-gap-insertion glass rod interface 108 and insertion glass rod Fresnel reflection takes place.Because there is the pitch angle at 107 and 108 interfaces, this Fresnel reflection light will can coupled back into optical fibers.
In addition, 109 places at the interface, beam diameter is much larger than the core diameter of single-mode fiber, thereby significantly reduced the Fresnel reflection light that can return optical fiber.Plate one deck anti-reflection film by 109 places, interface and can further weaken Fresnel reflection light at glass rod 104.This shows, promptly have angle of wedge end face to adopt the optical cement method to couple together to optical fiber pigtail 102 and glass rod 104, can eliminate the reflection at interface 107 and 108 places by air-gap thickness is reduced to zero thickness.
As shown in Figure 4 be the another kind of specific embodiments that designs according to the present invention, wherein, charge into refractive index in the air-gap and equal n
CoreEpoxy glue 110.This scheme does not need mounting bush 103.In order to fix and protect structure shown in Figure 4 under the situation of not using mounting bush 103, collimating apparatus holder shown in Figure 2 has the hole of a suitable diameter.
Add the insertion glass rod in this laser aligner design following some benefit is arranged.At first, it has corrected the direction from optical fiber pigtail 102 light cones, and light is propagated along the collimating apparatus optical axis direction.Thereby make the center of light, and make the direction of the parallel beam that process is expanded and the optical axis direction of laser aligner be consistent through plano-convex lens 106.
Secondly because through the refractive index of the light of glass rod 104 greater than air refraction, so the effective focal length length of plano-convex lens 106 greater than optical fiber head to the actual range between plano-convex lens.Like this, the curvature of the sphere of this plano-convex lens 106 is less than the curvature of the required similar lens of collimating apparatus, and medium all is an air between optical fiber head in this collimating apparatus and the lens, as shown in Figure 1.Again since the diameter of plano-convex lens 106 among the present invention is less and its plane surface perpendicular to optical axis, so the plano-convex lens 106 among the present invention is easier to processing and manufacturing than the lens 106a of collimating apparatus shown in Figure 1.
At last, because light is less through the center and the lens curvature of lens, thereby the spherical aberration of the light generation by collimating apparatus also can be littler.In specific embodiments shown in Figure 3, inserting glass rod 104 has two end faces 108 and 109, and they become 82 degree and an angle of 90 degrees respectively with the laser aligner optical axis.The personage who is proficient in this technology is very easy to find, and adopts other suitable angles can reach the light cone of correcting light equally and departs from (this light is from optical fiber head) and make its direction of propagation purpose consistent with the collimating apparatus optical axis direction.But, the angle of wedge of end face 108 is preferably selected with optical fiber head end face 107 and is complementary, because like this can be so that the air-gap minimum that both ends of the surface are asked.
Those skilled in the art also can find in optical fiber head 200 many optical fiber to be arranged.For example, two optical fiber can be arranged in the optical fiber head 200.For collimating apparatus and receiver are calibrated to point-blank, second optical fiber is used to visible emitting, and this visible light plays the aligned orientation effect.When picked up signal, can moderately regulate collimating apparatus and receiver position to obtain maximum receiving signal.Second optical fiber also can be used for transmitting the signal of another wavelength in carrying the light device.In this embodiment, need use dichroic filter or other wavelength separated devices to separate two wavelength in the receiver.
Another object of the present invention provides a kind of optical fiber head, and in order to increase the light cone half-angle of the light that optical fiber pigtail 102 sends, it makes the light emission that one bigger acceptance angle θ be arranged
AcceptanceIt can increase the diameter of the parallel beam of collimating apparatus outgoing under the prerequisite that does not increase collimating apparatus length, make laser aligner can obtain bigger beam spread like this in tight structure.
Acceptance angle is a specific character of optical fiber, and relevant with Optical Fiber Numerical Aperture NA and fibre core, cladding index, expression formula:
Like this, can increase numerical aperture by the difference that increases fiber core and cladding index.In practice, this can realize by the doping that increases fibre core in the optical fiber manufacture process.Therefore, a kind of approach that increases acceptance angle is to use and a kind ofly has the single mode special fiber of bigger numerical aperture to produce optical fiber pigtail 200.
Specific embodiments of the present invention as shown in Figure 5 only provides the synoptic diagram of the sleeve pipe 103 of collimating apparatus among Fig. 2 in the figure.Here, single-mode fiber 101 shown in Figure 3 has the special fiber 301 of higher fiber core refractive index to replace by one.For making the refractive index of inserting glass rod 104 equate that with the fiber core refractive index of special fiber 301 glass rod 104 should have a bigger refractive index.
In this method, normalized frequency V=(the π d/ λ) NA of special fiber 301 is equated with the normalized frequency of the standard telecommunication optical fiber that is used as the semiconductor laser tail optical fiber.Can be met single mode telecommunication optical fiber 101 and 301 these requirements of single mode special fiber, allow core diameter be respectively d and d
s, numerical aperture is respectively NA and NA
sSo just obtain d
s/ NA
s=d/NA.According to ratio d/d
s, the numerical aperture of special fiber 301 is greater than the numerical aperture of telecommunication optical fiber.
The diameter that makes the single mode special fiber is half of telecommunication optical fiber, and this is feasible; Thereby making its numerical aperture is the twice of telecommunication optical fiber.Correspondingly, acceptance angle is also according to concerning sin θ
Acceptance=NA
sIncrease.Thereby it is fully feasible adopt this method that acceptance angle is doubled its laser beam diameter that sends similarly being increased.A kind of practical plan is that the single mode special fiber is linked to each other with the single-mode fiber head of semiconductor laser.
As United States Patent (USP) 6,275, (with reference to wherein about the mode field diameter of the single-mode fiber tail optical fiber that how to mate semiconductor laser) described in 627, this can realize by thermal expansion of special fiber fibre core.By the laser fiber tail optical fiber is carried out direct welding, make the special fiber that is used in the optical fiber pigtail manufacturing realize thermal expansion.It is made optical fiber head and directly is welded together with the laser fiber tail optical fiber.Fig. 5 represents by fusion splice 306 laser diode 304 to be connected with single mode special fiber 301, and wherein, the optical fiber that 304 optical fiber pigtail adopts is standard traffic single-mode fiber 101.
Illustration shown in Figure 5 is represented the enlarged drawing of fusion splice 306 near zones.It shows at weld, and the diameter of the fibre core 302 of special optical fiber 301 is complementary with the diameter of the fibre core 307 of single-mode fiber 101 after thermal expansion.There are some difficulties in the method for the light cone acceptance angle of this increase optical fiber pigtail 102 emergent lights, that special fiber that needs to pack into exactly in optical fiber head 200.
The another kind of method that increases acceptance angle does not need this special fiber, just draws wimble structure in the terminal formation one of standard single-mode fiber.This can adopt a kind of technology of making fusion biconial coupling mechanism that is similar to realize.Several centimetres bare fibres are placed the anchor clamps tension and heat its center with the hydrogen flame.Treat after its glass deliquescing, slowly elongate optical fiber and make it to become a biconial and draw wimble structure.Then biconial is drawn awl near the bicone center, to cut off and form one and half bicones or tapering point.Make the conical fiber tail optical fiber that is fit to and to satisfy following condition.
At first, can not draw wimble fraction to be converted into radiation mode, should draw awl in progressive mode for making the light of in single-mode fiber, propagating.Secondly, fibre diameter will be drawn the enough little degree of boring, so that in fiber core with the constraint mode propagation light enter covering and draw the awl end face structure in still with the constraint mode propagation, this draw wimble structure be with air as covering, with optical fiber glass as fibre core.
Drawing in the awl process of local normalized frequency V=(π d/ λ) NA ≈ 1,, core diameter d just can realize this condition in enough hour when becoming.Fig. 6 represents the sleeve pipe 103 of the laser aligner in the specific embodiments of the present invention.Half bicone or tapered fiber tail optical fiber 400 are contained in the kapillary 201 and some is outstanding outside.
Usually we can see, drawing the waveguiding structure of awl end 400 at optical fiber is short and small circular glass rod waveguides, and it has one deck air cladding layer and the output terminal 401 that angle of wedge end face is arranged.Because covering is an air, this fibre-optic waveguide 400 has a bigger numerical aperture (NA ≈ 1.1).If 400 on fibre-optic waveguide structure is supported single mode transport, normalized frequency V＜2.405 this means that fibre diameter is very little, can reach light wavelength lambda=1550nm magnitude.Have larger-diameter fibre-optic waveguide structure 400 also can be used, this is to being proficient in worth happy event of this technology personage Lai Shuoshi.Even normalized frequency V＞2.405, optical fiber structure 400 is a multimode waveguide, but owing to when single-mode fiber enters this waveguiding structure 400, only exciting low-order mode when light, feasible thereby use is still than large-diameter fibre-optical.
Yet in this case, the half-angle of optical fiber head outgoing light cone and numerical aperture are irrelevant but depend on the transport property of low-order mode in the fibre-optic waveguide 400.An actual application problem is how to assemble optical fiber head.In assembling, must make the fibre-optic waveguide structure outstanding a bit of in air from kapillary 201, but this has limited the length of waveguiding structure 400.Forms because fibre-optic waveguide structure 400 mainly is the cladding glass by single-mode fiber 101, the refractive index of insertion glass rod 104 is generally equal to the cladding index of single-mode fiber 101.
Being proficient in this technology personage can find, the end 401 of waveguiding structure 400 can adopt the optical cement method to be connected with the insertion glass rod, and suitably the epoxy glue of refractive index can be used to reinforce fibre-optic waveguide structure 400 and inserts being connected between glass rod.
Claims (13)
1. be used for collimating a kind of laser aligner of abundant light beam, its feature comprises:
Article-one, the optical fiber of fibre core by the covering bundle, this optical fiber has one to be used to receive the input end of laser and to be used to transmit the output terminal of the inclination of this laser;
-one lens, it is used for fully collimating a branch of input beam that receives from fiber-optic output;
-one light-guide device between fiber-optic output and lens, is used for correcting the angle deviating from the light beam of this slant optical fiber output terminal.
2. a kind of laser aligner according to claim 1, it comprises a sleeve pipe that is used for fixing optical fiber, and wherein this sleeve pipe and optical fiber have the longitudinal axis that is parallel to each other and both end faces at grade, and this end face is followed with the vertical plane of this longitudinal axis and is become an angle of wedge.
3. a kind of laser aligner according to claim 2, wherein, light-guide device is a wedge.
4. a kind of laser aligner according to claim 3, wherein, wedge has an inclined surface, and this surface is fully parallel with slant optical fiber end face on the other side.
5. a kind of laser aligner according to claim 4, wherein, wedge has an output end face relative with this inclined surface, and this output end face is vertical with the longitudinal axis of ferrule.
6. a kind of laser aligner according to claim 5, wherein, wedge and ferrule are fixed by an outer layer sleeve, and lens and outer sleeve are fixed to one another.
7. a kind of laser aligner according to claim 5, wherein, lens are to be bonded at an end of outer sleeve or to be firmly fixed in it.
8. a kind of laser aligner according to claim 1, wherein, this light-guide device has two unparalleled surfaces, and the refractive index of this element is almost equal with fiber core refractive index or equate fully.
9. a kind of laser aligner according to claim 1, wherein, the fiber-optic output numerical aperture is greater than the numerical aperture of input end.
10. a kind of laser aligner according to claim 1, wherein less than near the core diameter the input end, this is in order to reduce from the mode field diameter of output terminal light beam and to strengthen Optical Fiber Numerical Aperture and then expand this output beam to optical fiber near the core diameter output terminal.
11. a kind of laser aligner according to claim 2, wherein, light-guide device is almost not have luminous power.
12. a collimating apparatus that is used for collimated light beam, its feature comprises:
Article-one, the optical fiber of fibre core by the covering bundle, this optical fiber has an output terminal that is used to receive the input end of laser and is used for the inclination of emergent light respectively;
-one ferrule that is used for fixing optical fiber, wherein, ferrule and optical fiber have the longitudinal axis that is parallel to each other and both end faces at grade, this end face with become an inclination angle with the vertical plane of this longitudinal axis.
-one lens, this is to be used for abundant collimation from a branch of input beam that receives of fiber-optic output;
-one light-guide device, it has a light receiving surface and an exit facet on the other side, and this receiving plane and exit facet are uneven; Be the angle deviating of light beam in the output terminal of correcting inclination, this light-guide device is between fiber-optic output and lens; With a laser instrument that is optically coupled in optic fibre input end.
13. a kind of laser aligner according to claim 12, wherein, in order to carry out optically-coupled with optical fiber, this laser instrument comprises an optical fiber that has tail optical fiber, and light-guide device comes down to a wedge that does not almost have luminous power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01135801 CN1412602A (en) | 2001-10-18 | 2001-10-18 | Laser collimator for free space optical connection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01135801 CN1412602A (en) | 2001-10-18 | 2001-10-18 | Laser collimator for free space optical connection |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825712A (en) * | 2009-12-24 | 2010-09-08 | 哈尔滨工业大学 | 2 mu m all-fiber coherent laser Doppler wind finding radar system |
| CN101975979A (en) * | 2010-08-30 | 2011-02-16 | 长春理工大学 | Non-diffracting beam optical system for optical fiber coupling |
| CN1789795B (en) * | 2004-12-17 | 2011-04-27 | 日亚化学工业株式会社 | Light emitting device |
| CN102183823A (en) * | 2011-05-10 | 2011-09-14 | 南京邮电大学 | Optical fiber collimator |
| CN102183822A (en) * | 2011-04-20 | 2011-09-14 | 中国科学院上海微系统与信息技术研究所 | Elliptical light spot optical fiber collimator |
| CN102566074A (en) * | 2011-12-13 | 2012-07-11 | 深圳朗光科技有限公司 | Polarizer and optical fiber sensor comprising same |
| CN103926656A (en) * | 2014-04-21 | 2014-07-16 | 深圳市天阳谷科技发展有限公司 | Optical fiber collimator |
| CN105988233A (en) * | 2015-03-02 | 2016-10-05 | 光越科技(深圳)有限公司 | Low-voltage transmission-type optical fiber online electro-optical Q-modulation switch |
| CN107389107A (en) * | 2017-09-14 | 2017-11-24 | 陈郁芝 | A kind of optical fiber Deviation rectifier |
| CN109459824A (en) * | 2018-11-12 | 2019-03-12 | 长春理工大学 | It can be improved the two-stage space optical coupling device of single mode optical fiber space optical coupling efficiency |
| CN110199212A (en) * | 2017-01-24 | 2019-09-03 | Tdk株式会社 | The manufacturing method of optically coupled device and optically coupled device |
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2001
- 2001-10-18 CN CN 01135801 patent/CN1412602A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789795B (en) * | 2004-12-17 | 2011-04-27 | 日亚化学工业株式会社 | Light emitting device |
| CN101825712A (en) * | 2009-12-24 | 2010-09-08 | 哈尔滨工业大学 | 2 mu m all-fiber coherent laser Doppler wind finding radar system |
| CN101975979A (en) * | 2010-08-30 | 2011-02-16 | 长春理工大学 | Non-diffracting beam optical system for optical fiber coupling |
| CN102183822A (en) * | 2011-04-20 | 2011-09-14 | 中国科学院上海微系统与信息技术研究所 | Elliptical light spot optical fiber collimator |
| CN102183823A (en) * | 2011-05-10 | 2011-09-14 | 南京邮电大学 | Optical fiber collimator |
| CN102566074B (en) * | 2011-12-13 | 2013-11-13 | 深圳朗光科技有限公司 | Polarizer and optical fiber sensor comprising same |
| CN102566074A (en) * | 2011-12-13 | 2012-07-11 | 深圳朗光科技有限公司 | Polarizer and optical fiber sensor comprising same |
| CN103926656A (en) * | 2014-04-21 | 2014-07-16 | 深圳市天阳谷科技发展有限公司 | Optical fiber collimator |
| CN105988233A (en) * | 2015-03-02 | 2016-10-05 | 光越科技(深圳)有限公司 | Low-voltage transmission-type optical fiber online electro-optical Q-modulation switch |
| CN110199212A (en) * | 2017-01-24 | 2019-09-03 | Tdk株式会社 | The manufacturing method of optically coupled device and optically coupled device |
| CN107389107A (en) * | 2017-09-14 | 2017-11-24 | 陈郁芝 | A kind of optical fiber Deviation rectifier |
| CN109459824A (en) * | 2018-11-12 | 2019-03-12 | 长春理工大学 | It can be improved the two-stage space optical coupling device of single mode optical fiber space optical coupling efficiency |
| CN109459824B (en) * | 2018-11-12 | 2020-11-10 | 长春理工大学 | Two-stage space optical coupling device capable of improving single-mode optical fiber space optical coupling efficiency |
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