CN206618914U - Electrooptic modulator based on niobic acid lithium material - Google Patents
Electrooptic modulator based on niobic acid lithium material Download PDFInfo
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- CN206618914U CN206618914U CN201720158865.XU CN201720158865U CN206618914U CN 206618914 U CN206618914 U CN 206618914U CN 201720158865 U CN201720158865 U CN 201720158865U CN 206618914 U CN206618914 U CN 206618914U
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- laser
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- fiber stub
- electrooptic modulator
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Abstract
The utility model is related to a kind of electrooptic modulator based on niobic acid lithium material, including the first optical receiver, source coded signal and the semiconductor laser being sequentially connected, optical fiber, collimater, the polarizer, Electro-optical Modulation crystal unit, analyzer, laser power supply, power supply, the second optical receiver and driver, first optical receiver is connected with the polarizer and driver respectively, and source coded signal is connected with power supply and driver respectively.The utility model can realize output laser power 100mW 500mW, modulation bandwidth 0.5GHz 5.0GHz 810nm series of wavelengths Laser Modulations, overcome the defect that electrooptic modulator power and bandwidth condition each other, under conditions of suitably reduction bandwidth, improve the output laser power of electrooptic modulator, the need for remote free space, near space laser communication are met to optical maser wavelength and power, the need for practical application can be met well.
Description
Technical field
The utility model belongs to electrooptic modulator technical field, and in particular to a kind of Electro-optical Modulation based on niobic acid lithium material
Device.
Background technology
Electrooptic modulator is that a kind of device being modulated to laser is realized using the electrooptic effect of Electro-optical Modulation crystal, often
Apply in laser space communication system, communication laser is modulated.Due to attenuation characteristic of the laser in propagation in atmosphere, swash
The preferred 810nm of optical wavelength, and the power and bandwidth of electrooptic modulator mutually restricts, and electrooptic modulator of the prior art is defeated
Go out laser power often below 10mW, modulation optical maser wavelength is not for 810nm series, it is impossible to meet remote free space,
The need near space laser communication is to optical maser wavelength and power.
Utility model content
For above-mentioned problems of the prior art, the purpose of this utility model is that providing one kind can avoid the occurrence of
State the electrooptic modulator based on niobic acid lithium material of technological deficiency.
In order to realize above-mentioned utility model purpose, the technical scheme that the utility model is provided is as follows：
A kind of electrooptic modulator based on niobic acid lithium material, including the first optical receiver, source coded signal and connect successively
Semiconductor laser, optical fiber, collimater, the polarizer, Electro-optical Modulation crystal unit, analyzer, laser power supply, the power supply electricity connect
Source, the second optical receiver and driver, the first optical receiver are connected with the polarizer and driver respectively, source coded signal difference
It is connected with power supply and driver；The semiconductor laser include a laser diode, the laser diode it is defeated
Go out in light path to be disposed with collimating lens, a polarizer, a light splitting piece and an adjustable smallcolumn diaphragm, the light splitting piece it is anti-
Light path is penetrated provided with a photodiode, the photodiode is connected with a signal processing system signal, the signal transacting
System is connected with the laser diode signal.
Further, collimater is included with the collimation lens of optical axis, collimator structure part, fiber stub fixture, optical fiber
It is the cylinder communicated inside lock pin, fiber stub fastener and tail part protection set, collimator structure part, collimation lens is fixed on
In the through hole of collimator structure part one end；In the through hole of fiber stub insertion fiber stub fixture, optical fiber one end is inserted into light
The through hole of fine lock pin fastener is interior and is fixedly attached on fiber stub, fiber stub fastener pressed fiber lock pin, and optical fiber is inserted
Core fixture end face is fixed together with fiber stub fastener outer surface；Fiber stub fixture insertion collimator structure part is another
In the through hole of one end, collimator structure part end face is fixed together with fiber stub fixture；Tail part protection set is fixed on optical fiber
On lock pin fastener.
Further, the output light path between the collimation lens and the polarizer is provided with a beam shaping.
Further, the beam shaping is prism or cylindrical mirror.
Further, the collimation lens is aspheric collimation lens.
The electrooptic modulator based on niobic acid lithium material that the utility model is provided, it is possible to achieve output laser power 100mW-
500mW, modulation bandwidth 0.5GHz-5.0GHz 810nm series of wavelengths Laser Modulations, overcome electrooptic modulator power and bandwidth
The defect conditioned each other, under conditions of suitably reduction bandwidth, improves the output laser power of electrooptic modulator, meets long distance
From free space, near space laser communication to optical maser wavelength and power the need for, the need of practical application can be met well
Will.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is Electro-optical Modulation crystal unit index path；
Fig. 3 is the structural representation of semiconductor laser；
Fig. 4 is the structural representation of collimater；
In figure, 1- semiconductor lasers, 2- optical fiber, 3- collimaters, the 4- polarizers, 5- Electro-optical Modulation crystal units, 6- inspections
Inclined device, the optical receivers of 7- first, the optical receivers of 8- second, 9- laser power supplies, 10- power supplies, 11- drivers, 12- codings
Signal source, 13- laser diodes, the collimation lenses of 14- first, 15- beam shapings, 16- polarizers, 17- light splitting pieces, 18- can
Adjust smallcolumn diaphragm, 19- photodiodes, 20- signal processing systems, the collimation lenses of 21- second, 22- collimator structure parts, 23-
Fiber stub fixture, 24- fiber stubs, 25- collimator structure part end faces, 26- fiber stub fixture end faces, 27- optical fiber
Lock pin fastener, 28- tail part protection sets.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with the accompanying drawings and specifically
Embodiment is described further to the utility model.It should be appreciated that specific embodiment described herein is only to explain this reality
With new, it is not used to limit the utility model.Based on the embodiment in the utility model, those of ordinary skill in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of the utility model protection.
As shown in figure 1, a kind of electrooptic modulator based on niobic acid lithium material, including the first optical receiver 7, source coded signal
12 and the semiconductor laser 1, optical fiber 2, collimater 3, the polarizer 4, Electro-optical Modulation crystal unit 5, the analyzer that are sequentially connected
6th, laser power supply 9, power supply 10, the second optical receiver 8 and driver 11, the first optical receiver 7 respectively with the polarizer 4 and
Driver 11 is connected, and source coded signal 12 is connected with power supply 10 and driver 11 respectively.Electro-optical Modulation crystal unit 5
Using " hybrid modulation " mode of N number of Electro-optical Modulation crystal, and broadband traveling wave electrode is used, wherein N=2m, m is natural number.Half
Conductor laser 1 is connected by optical fiber 2 with collimater 3, semiconductor laser 1 launch laser by integer after collimater 3,
Optical fiber 2 makes semiconductor laser 1 and collimater 3 realize fiber coupling, improves the efficiency of transmission of laser.The polarizer 4 and electricity
Light modulation crystal unit 5 is connected, and Electro-optical Modulation crystal unit 5 is connected with analyzer 6, and Electro-optical Modulation crystal unit 5 is used
" hybrid modulation " mode, the material selection lithium niobate (LiNbO of Electro-optical Modulation crystal unit 53) material, Electro-optical Modulation crystal unit
Containing 2 Electro-optical Modulation crystal in 5,2 Electro-optical Modulation crystalline sizes are identical, and long and height is all 10mm, wide 20mm, shape
All it is cuboid, the optical axis of 2 Electro-optical Modulation crystal is disposed vertically, this placement Electro-optical Modulation crystal is reduced due to naturally double
Drifted about caused by phase delay caused by refraction and temperature；The laser launched by collimater 3 turns into polarization after the polarizer 4
Light, polarised light after Electro-optical Modulation crystal unit 5 by being modulated, and the polarised light after modulation delivers to subordinate after analyzer 6
Use unit.
As shown in Fig. 2 the light beam from the full aperture outgoing of the outgoing end face of Electro-optical Modulation crystal unit 5 launch from collimater 3,
Analyzer 6 is arrived sequentially through the polarizer 4 and Electro-optical Modulation crystal unit 5, and the material of the polarizer 4 and analyzer 6 is calcite, its
Refractive index at 0.1 μm of wavelength is n ≈ 1.65, the polarizer 4 and analyzer 6 equivalent optical path L1=8/n=8/1.65=
4.95 (mm), refractive index of the lithium niobate Electro-optical Modulation crystal at 0.81 μm is n0=2.186, its equivalent optical path L2=40/n0=
40/2.186 ≈ 18.25 (mm), from the end face of collimater 3 to equivalent optical path L '=L1+ of the plane of incidence of Electro-optical Modulation crystal unit 5
L2+(30-8-2×21/2) ≈ 26.01 (mm), from the end face of collimater 3 to the equivalent optical path of the exit facet of Electro-optical Modulation crystal unit 5
For L '+L2=26.01+18.25=44.26 (mm).
The polarizer 4 and the connection of the photoelectric coupling of optical receiver 7, Electro-optical Modulation crystal unit 5 and driver 11 use high frequency coaxial
Cable connection, analyzer 6 and the connection of the photoelectric coupling of optical receiver 7, optical receiver 7 and optical receiver 8 are used with driver 11 respectively
Coaxial cable for high frequency is connected；
Laser power supply 9 is connected with semiconductor laser 1 with coaxial cable for high frequency, and laser power supply 9 and semiconductor swash
Light device 1 is supporting, and laser power supply 9 is that semiconductor laser 1 provides power supply；
Source coded signal 12 is connected with driver 11 with coaxial cable for high frequency；Driver 11 and source coded signal 12 are matched somebody with somebody
Set, square wave AC signal is provided for Electro-optical Modulation crystal.Source coded signal 12 is that driver 11 provides high frequency, high-power square wave friendship
Signal is flowed, the output signal of driver 11 is added on Electro-optical Modulation crystal unit 5 by coaxial cable for high frequency and special electrode, can be with
Change the electro-optical characteristic of Electro-optical Modulation crystal unit 5 according to source coded signal 12, sent so as to modulate the polarizer 4 to Electro-optical Modulation
The polarised light of crystal unit 5；
Power supply 10 is connected with laser power supply 9, source coded signal 12 and driver 11 with wire respectively, power supply electricity
Source 10 is that laser power supply 9, source coded signal 12 and driver 11 provide power supply；
The light samples signal of Electro-optical Modulation crystal unit 5 and the light samples signal of modulator is left with the first optical receiver 7
Received with the second optical receiver 8, change into electric signal, a closed loop electro-optical feedback control system is formed, so as to realize to static state
The real-time control of operating point, can maintain desired quiescent point.The various pieces of this electrooptic modulator use optical fiber and light
It is electrically coupled, constitutes a feedback control system.
As shown in figure 3, semiconductor laser 1 is included on laser diode 13, the output light path of laser diode 13 successively
It is provided with the first collimation lens 14, beam shaping 15, polarizer 16, light splitting piece 17 and adjustable smallcolumn diaphragm 18, light splitting piece 17
Reflected light path be provided with photodiode 19, photodiode 19 is connected with the signal of signal processing system 20, signal transacting system
System 20 is connected with the signal of laser diode 13.Optionally, the first collimation lens 14 is aspheric collimation lens, beam shaping 15
For prism or cylindrical mirror.
The output of laser diode 13 includes the light beam of fast axle light beam and slow axis beam, and wherein fast axle light beam passes through the first collimation
Lens 14 are collimated, and slow axis beam passes through the shaping of beam shaping 15；The slow axis beam after fast axle light beam and shaping after collimation enters
Penetrate polarizer 16 and obtain high polarization ratio light beam, polarizer 16 can improve the polarization ratio of semiconductor laser 1, reduce due to temperature
The unstability for the laser output that the factor such as degree and the driving current of laser diode 13 is caused；Due to the factor meeting such as temperature, electric current
The change of polarization of laser output component is caused, so as to cause to enter the internal signal of photodiode 19 due to the change of polarized component
And change, and then cause signal processing system to be difficult the stability for controlling laser output；And add polarizer 16 significantly
The polarized component of a direction is improved, that is, the laser for adding a certain polarization direction after polarizer 16 is occupied an leading position, and other are inclined
The laser in direction of shaking can be ignored, so as to reduce due to laser polarization component caused by the factors such as temperature, electric current not
Break and change and cause being continually changing into the internal signal of photodiode 19, obtain high polarization ratio light beam, improve laser
The stability of output；Above-mentioned high polarization ratio light beam is asymmetric by being carried out in a part of incident adjustable smallcolumn diaphragm 18 of light splitting piece 17
Apodization, so as to eliminate and compensate the aberration and diffraction phenomena of the fast axle light beam of laser diode 13, obtains high-quality light beam, gram
The ropy defect of semiconductor laser output beams of the prior art is taken, another part is reflected into photodiode 19；
The optical signal collected is switched to electric signal input signal processing system 20 by photodiode 19, and signal processing system 20 will be inputted
Electric signal be compared with default value, the power output of output signal control laser diode 13 is formed back after analysis
Road is controlled, and the stability of laser output is improved, so as to produce high stable light beam.
As shown in figure 4, collimater 3 is included with the collimation lens 21 of optical axis, collimator structure part 22, fiber stub 24, light
Fine lock pin fixture 23, fiber stub fastener 27 and tail part protection set 29；The inside of collimator structure part 22 is the circle communicated
Cylindricality, the second collimation lens 21 is fixed in the through hole of the one end of collimator structure part 22, and the insertion fiber stub of fiber stub 24 is consolidated
In the through hole for determining part 23, the through hole of one end insertion fiber stub fastener 27 of optical fiber 2 is interior and is fixedly attached to fiber stub 24
On, the other end of optical fiber 2 is connected on semiconductor laser 1；The pressed fiber lock pin 24 of fiber stub fastener 27, is greatly carried
The high structural stability of collimater；Fiber stub fixture end face 26 passes through Laser Welding with the outer surface of fiber stub fastener 27
Connect and be fixed together, laser welding fixed form adds the heat-sinking capability of fiber-optic output；Fiber stub fixture 13 is inserted
In the through hole of the other end of collimator structure part 22, by laser welding by collimator structure part end face 25 and fiber stub fixture
23 outer surface is welded and fixed together；Using laser welding fixed form, the temperature and Stability Analysis of Structures of collimater 3 are improved
Property, overcome be adhesively fixed in the prior art using glue caused by optical component and fiber end face are polluted lack
Fall into；Tail part protection set 28 is fixed on fiber stub fastener 27, drastically increases the structural stability of collimater.Second is accurate
Straight lens 21 are non-spherical lens or condenser lens.Fiber stub fixture 23, fiber stub fastener 27 and tail part protection set
28 setting drastically increases the structural stability of collimater 3, overcome prior art collimator structure it is unstable lack
Fall into.
The electrooptic modulator based on niobic acid lithium material that the utility model is provided, it is possible to achieve output laser power 100mW-
500mW, modulation bandwidth 0.5GHz-5.0GHz 810nm series of wavelengths Laser Modulations, overcome electrooptic modulator power and bandwidth
The defect conditioned each other, under conditions of suitably reduction bandwidth, improves the output laser power of electrooptic modulator, meets long distance
From free space, near space laser communication to optical maser wavelength and power the need for, the need of practical application can be met well
Will.
Embodiment described above only expresses embodiment of the present utility model, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the utility model the scope of the claims can not be interpreted as.It should be pointed out that for the ordinary skill of this area
For personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this
The protection domain of utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (5)
1. a kind of electrooptic modulator based on niobic acid lithium material, it is characterised in that including the first optical receiver, source coded signal with
And semiconductor laser, optical fiber, collimater, the polarizer, Electro-optical Modulation crystal unit, analyzer, the laser electricity being sequentially connected
Source, power supply, the second optical receiver and driver, the first optical receiver are connected with the polarizer and driver respectively, coding
Signal source is connected with power supply and driver respectively；The semiconductor laser includes a laser diode, the laser
Collimating lens, a polarizer, a light splitting piece and an adjustable smallcolumn diaphragm are disposed with the output light path of diode, it is described
The reflected light path of light splitting piece is provided with a photodiode, and the photodiode is connected with a signal processing system signal, institute
Signal processing system is stated to be connected with the laser diode signal.
2. the electrooptic modulator according to claim 1 based on niobic acid lithium material, it is characterised in that collimater includes sharing the same light
Collimation lens, collimator structure part, fiber stub fixture, fiber stub, fiber stub fastener and the tail part protection set of axle,
It is the cylinder communicated inside collimator structure part, collimation lens is fixed in the through hole of collimator structure part one end；Optical fiber is inserted
In the through hole of core insertion fiber stub fixture, optical fiber one end is inserted into the through hole of fiber stub fastener and is fixedly attached to
On fiber stub, fiber stub fastener pressed fiber lock pin, fiber stub fixture end face and fiber stub fastener appearance
Face is fixed together；Fiber stub fixture insertion the collimator structure part other end through hole in, collimator structure part end face with
Fiber stub fixture is fixed together；Tail part protection set is fixed on fiber stub fastener.
3. the electrooptic modulator according to claim 1 based on niobic acid lithium material, it is characterised in that the collimation lens and
Output light path between the polarizer is provided with a beam shaping.
4. the electrooptic modulator according to claim 3 based on niobic acid lithium material, it is characterised in that the beam shaping
For prism or cylindrical mirror.
5. the electrooptic modulator according to claim 3 based on niobic acid lithium material, it is characterised in that the collimation lens is
Aspheric collimation lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720158865.XU CN206618914U (en) | 2017-02-21 | 2017-02-21 | Electrooptic modulator based on niobic acid lithium material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720158865.XU CN206618914U (en) | 2017-02-21 | 2017-02-21 | Electrooptic modulator based on niobic acid lithium material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206618914U true CN206618914U (en) | 2017-11-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720158865.XU Expired - Fee Related CN206618914U (en) | 2017-02-21 | 2017-02-21 | Electrooptic modulator based on niobic acid lithium material |
Country Status (1)
| Country | Link |
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| CN (1) | CN206618914U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111698040A (en) * | 2020-05-13 | 2020-09-22 | 西安电子科技大学 | Underwater large dynamic blue-green laser communication receiving method and device based on polarization interference |
| CN111988088A (en) * | 2019-05-24 | 2020-11-24 | 京瓷株式会社 | Power supply device and power receiving device of optical power supply system, and optical power supply system |
| CN112505653A (en) * | 2020-11-23 | 2021-03-16 | 杭州蓝芯科技有限公司 | Light source, depth camera and laser radar based on electro-optical modulation |
-
2017
- 2017-02-21 CN CN201720158865.XU patent/CN206618914U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111988088A (en) * | 2019-05-24 | 2020-11-24 | 京瓷株式会社 | Power supply device and power receiving device of optical power supply system, and optical power supply system |
| CN111698040A (en) * | 2020-05-13 | 2020-09-22 | 西安电子科技大学 | Underwater large dynamic blue-green laser communication receiving method and device based on polarization interference |
| CN112505653A (en) * | 2020-11-23 | 2021-03-16 | 杭州蓝芯科技有限公司 | Light source, depth camera and laser radar based on electro-optical modulation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171107 Termination date: 20210221 |
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| CF01 | Termination of patent right due to non-payment of annual fee |