CN206960541U - A kind of electro-optic phase modulator half-wave voltage measuring system - Google Patents
A kind of electro-optic phase modulator half-wave voltage measuring system Download PDFInfo
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- CN206960541U CN206960541U CN201720776332.8U CN201720776332U CN206960541U CN 206960541 U CN206960541 U CN 206960541U CN 201720776332 U CN201720776332 U CN 201720776332U CN 206960541 U CN206960541 U CN 206960541U
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Abstract
The utility model discloses a kind of electro-optic phase modulator half-wave voltage measuring system, including pulse laser, circulator, beam splitter, first Polarization Controller, polarize selection device, phase-modulator, second Polarization Controller, voltage source and power meter, pulse laser is connected with the port C1 of the circulator, the port C2 of circulator is connected with the port B1 of the beam splitter, the port B4 of beam splitter is connected with the first Polarization Controller, first Polarization Controller is connected with polarization selection device, the polarization selection device is connected with phase-modulator, voltage source is connected with phase-modulator, phase-modulator is connected with the second Polarization Controller, the port B3 connections of second Polarization Controller and beam splitter, the port C3 of circulator is connected with power meter, the port B2 of the beam splitter is vacant.The utility model has the function of reducing cost, improve the measuring precision.
Description
Technical field
It the utility model is related to optical communications industry, and in particular to a kind of electro-optic phase modulator half-wave voltage measuring system.
Background technology
Electro-optic phase modulator is widely used in fields such as optic communication, Microwave photonics, particularly sends out in recent years
Open up in quick quantum communication system, light phase modulation is generally realized by electro-optic phase modulator.With the electricity of fiber coupling
Exemplified by optical phase modulator, its general principle utilizes the photoelectric effect of fibre-optic waveguide medium anisotropy, i.e., by changing optical fiber
Applied voltage makes its refraction index changing, so as to changing phase of light wave.One of core parameter of electro-optic phase modulator is exactly half
Wave voltage, it characterizes the knots modification of required bias voltage when causing phase delay to be pi.It characterizes the modulation of phase-modulator
Efficiency and modulation power consumption, it is largely fixed the performance of phase-modulator.
At present, one of conventional Electro-optical Modulation crystal half-wave voltage measuring method is to use extremal measure method, and it is substantially former
Reason is to build an optical interferometer device, places phase-modulator in the arm of interferometer one, and load DC voltage.Institute is alive
Size, determines the phase difference of interferometer two-arm, and then changes interferometer output intensity.Interferometer output intensity is adjacent greatly
The difference of DC voltage corresponding to value and minimum is half-wave voltage.This measuring method is relatively also easier, but has
Light path optical path difference sensitivity is unstable, the shortcomings of being easily affected by the external environment.
In recent years, researcher proposed the measurement half-wave voltage method based on Sagnac fibre optic interferometer, in this scheme
In, because interferometer two-arm transmission light experienced identical light path, so system is relatively stable.But such device and optic communication
Simulation is the same, and its measurement accuracy judges accurate dependent on extreme point.If the judgement for being worth point is excessively coarse, will cause
Measure data precision is not high.For titanium diffused phase-modulator, due to only being modulated in a polarization direction light phase, still
Two polarization directions all thang-kngs.Not modulated polarized light component is concerned with receiving terminal, and a substrate can be added in extreme value, is made
The reduction of interference curve contrast can not be caused close to 0 by obtaining interference curve minimum；For proton exchange type phase-modulator, by
In an only polarization direction by the way that when the devices such as regular beam splitter are connected thereto, both coupling losses are larger, cause whole
Light path thang-kng remitted its fury, and then make the reduction of light intensity extreme value resolution ratio.For being based on Sagnac interferometers interference extreme value at this stage
Measuring system, maximum and minimum all do not optimize so that interference curve contrast reduce so that measurement essence
Degree is limited.Further, since existing device needs the expensive instruments such as photoelectric conversion device, oscillograph, measuring system Costco Wholesale
It is higher.
Utility model content
Technical problem to be solved in the utility model is high for above-mentioned cost in the prior art and measurement accuracy is low
Deficiency provides a kind of electro-optic phase modulator half-wave voltage measuring system, and this electro-optic phase modulator half-wave voltage measuring system is not
It the expensive instruments such as light requirement electrical switching device, oscillograph, can realize in the state of scheme optimization, improve the measuring precision and drop
The purpose of low measurement cost.
To realize above-mentioned technical purpose, the technical scheme that the utility model is taken is：
A kind of electro-optic phase modulator half-wave voltage measuring system, including pulse laser, circulator, beam splitter, first
Polarization Controller, polarization selection device, phase-modulator, the second Polarization Controller, voltage source and power meter, the circulator bag
Port C1, port C2 and port C3 are included, the beam splitter is 2 × 2 3dB beam splitters, and the beam splitter includes port B1, port
B2, port B3 and port B4, the pulse laser are connected with the port C1 of the circulator, the port C2 of the circulator with
The port B1 connections of the beam splitter, the port B4 of the beam splitter are connected with the first Polarization Controller, the first polarization control
Device processed is connected with polarization selection device, and the polarization selection device is connected with phase-modulator, the voltage source and phase-modulation
Device is connected, and the phase-modulator is connected with the second Polarization Controller, the port B3 of second Polarization Controller and beam splitter
Connection, the port C3 of the circulator are connected with power meter, and the port B2 of the beam splitter is vacant.
As the further improved technical scheme of the utility model, the port B4 of the beam splitter, the first Polarization Controller,
The port B3 for polarizing selection device, phase-modulator, the second Polarization Controller and beam splitter is sequentially connected so as to form Sagnac
Ring structure.
As the further improved technical scheme of the utility model, the polarization selection device is polarization beam apparatus, described
Polarization beam apparatus includes port P1, port P2 and port P3, and the port P3 of first Polarization Controller and polarization beam apparatus connects
Connect, the port P1 of the polarization beam apparatus is connected with phase-modulator, and the port P2 of the polarization beam apparatus is vacant, the polarization
The port P3 of beam splitter is to close Shu Duan, the tail optical fiber of P1 ports output and the tail optical fiber type of phase-modulator of the polarization beam apparatus
It is identical.
As the further improved technical scheme of the utility model, the polarization selection device is optical fiber analyzer, described
First Polarization Controller is connected by optical fiber analyzer with the phase-modulator, the optical direction of the optical fiber analyzer and institute
The modulating polarization direction for stating phase-modulator is identical.
As the further improved technical scheme of the utility model, the circulator, beam splitter, the first Polarization Controller and
Second Polarization Controller is single-mode optical fiber pigtail device.
A kind of electro-optic phase modulator half-wave voltage measuring system provided by the utility model, its light channel structure is simple, easily
In building, involved Sagnac ring structures light path perfect can ensure time domain matching, not by extraneous phase drift and random two-fold
The influence penetrated.By the Polarization Controller of addition first and the second Polarization Controller in system optimization, phase-modulator is improved
The thang-kng intensity in modulating polarization direction；Realize that polarization selection, polarization filter out by adding polarization beam apparatus, reduce phase-modulation
The interference strength of the not modulated polarised light of device, improve measurement accuracy.By above-mentioned effect, interference maximum can be improved, is reduced
Interfere minimum, strengthen interference curve visibility, improve the measuring precision.Meanwhile this measuring system is not required to opto-electronic conversion dress
Put, the expensive instrument such as oscillograph, reduce measurement cost, in the state of scheme optimization, the utility model can be bent by being fitted
Line expression formula reaches the purpose for improving the measuring precision.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is modulation voltage of the present utility model and luminous power matched curve figure.
Embodiment
Specific embodiment of the present utility model is further illustrated below according to Fig. 1 and Fig. 2：
Referring to Fig. 1, a kind of electro-optic phase modulator half-wave voltage measuring system, including pulse laser, circulator, beam splitting
Device, the first Polarization Controller, polarization selection device, phase-modulator, the second Polarization Controller, voltage source and power meter, it is described
Circulator includes port C1, port C2 and port C3, and the beam splitter is 2 × 2 3dB beam splitters, and the beam splitter includes end
Mouth B1, port B2, port B3 and port B4, the pulse laser are connected with the port C1 of the circulator, the circulator
Port C2 be connected with the port B1 of the beam splitter, the port B4 of the beam splitter is connected with the first Polarization Controller, described
First Polarization Controller is connected with polarization selection device, and the polarization selection device is connected with phase-modulator, the voltage source
It is connected with phase-modulator, the phase-modulator is connected with the second Polarization Controller, second Polarization Controller and beam splitting
The port B3 connections of device, the port C3 of the circulator are connected with power meter, and the port B2 of the beam splitter is vacant.
The port B4 of the beam splitter, the first Polarization Controller, polarization selection device, phase-modulator, the second polarization control
The port B3 of device and beam splitter processed is sequentially connected so as to form Sagnac ring structures.Light pulse through Sagnac ring structures modulation after,
Interference pulse returns to input path from 3dB splitter ports B1 ends.The circulator, beam splitter, the first Polarization Controller and
Two Polarization Controllers are single-mode optical fiber pigtail device.
The polarization selection device is polarization beam apparatus, and the polarization beam apparatus includes port P1, port P2 and port P3,
The port P3 connections of first Polarization Controller and polarization beam apparatus, the port P1 and phase-modulator of the polarization beam apparatus
Connection, the port P2 of the polarization beam apparatus is vacant, and the port P3 of the polarization beam apparatus is to close Shu Duan, the polarization beam apparatus
P1 ports output tail optical fiber it is identical with the tail optical fiber type of phase-modulator.
First Polarization Controller and the second Polarization Controller are respectively used to modulate light pulse signal clockwise and light counterclockwise
The pulse light polarization of pulse signal.Wherein, the first Polarization Controller adjustment clockwise transmission light polarization, couples its maximal efficiency
Into polarization beam apparatus port P1；Second Polarization Controller adjusts counterclockwise transmission light polarization, polarization is adjusted with phase-modulator
Direction processed is identical.By adjusting the first Polarization Controller and the second Polarization Controller, intracavitary is operated maximum optical power, export phase
Dry light intensity is maximum.For polarization beam apparatus port P3 to close Shu Duan, tail optical fiber is general single mode fiber.Beam splitting port P2 is vacant.Beam splitting end
Mouth P1, port P2 output tail optical fibers are identical with phase-modulator tail optical fiber type.When phase-modulator tail optical fiber is general single mode fiber
(polarization maintaining optical fibre of slow axis alignment), then port P1, port P2 are also general single mode fiber (polarization maintaining optical fibre of slow axis alignment).Especially
, the present embodiment can replace polarization beam apparatus with optical fiber analyzer, and when using optical fiber analyzer, its optical direction should adjust
To be identical with phase modulator modulation polarization direction.
Can be based on titanium diffusion technique or proton exchange process for the phase-modulator involved by this embodiment
's.Particularly, when phase-modulator uses proton exchange process, because phase-modulator can only be polarized by one kind in itself
Light, there is polarization filtering effect, then the polarization beam apparatus in this scheme can save, and can also retain, and realize further polarization selection
Effect.
The phase-modulator is placed in Sagnac ring structure asymmetric positions.And light pulse signal clockwise and light counterclockwise
Sequences of pulsed signals is more than the rising edge and trailing edge of phase modulator modulation voltage by the time domain delay of phase-modulator, this
The light pulse signal clockwise light pulse signal sequence more counterclockwise of embodiment passes through the time domain delay about 20ns of phase-modulator,
Rising edge and the trailing edge about 2ns of phase modulator modulation voltage.The Voltage Pulse Width of phase-modulator loading is more than or equal to
Light impulse length, the voltage pulse about 12ns of the phase-modulator loading of the present embodiment, light impulse length 1ns, repetition rate
1MHz, repetition rate are identical with light pulse.The voltage pulse of voltage source is carried in the time of phase-modulator, with light arteries and veins clockwise
Rush one of signal or light pulse signal sequence counterclockwise and reach the phase-modulator time above synchronously, only light pulse clockwise is believed
Number or counterclockwise the light pulse of one of light pulse signal carry out phase-modulation.
The circulator, export from port C1 incident lights from port C2, exported from port C2 incident lights from port C3.Annular
Device port C3 connects with high sensitivity power meter, to observe the interference pulse intensity of Sagnac ring structures output.
The measuring method proposed for the electro-optic phase modulator half-wave voltage measuring system of said structure, including following step
Suddenly：
Step 1：Pulsed laser power supply is opened, laser pulse is successively by the port C1 of circulator, the port of circulator
Laser pulse is divided into light pulse signal clockwise and light pulse signal counterclockwise by C2 and beam splitter, beam splitter；
Step 2：By adjusting the first Polarization Controller so as to adjust the polarization state of light pulse signal clockwise, power is observed
The registration of output is counted, when the registration of power meter output reaches maximum, fixes the first Polarization Controller；Obtain relative maximum
Value.
Step 3：By adjusting the second Polarization Controller so as to adjust the polarization state of light pulse signal counterclockwise, power is observed
The registration of output is counted, when the registration of power meter output reaches maximum, fixes the second Polarization Controller；
Step 4：Finely tune the first Polarization Controller and the second Polarization Controller, the registration of observation power meter output so that work(
Rate meter registration is maximum, the maximum of the registration of recording power meter output；Illustrate that now beam splitter exports light polarization signal clockwise
When passing through phase-modulator with light polarization signal counterclockwise, its polarization direction is identical with phase modulator modulation polarization direction,
The interference output result that power meter measures is maximum.
Step 5：Stop the first Polarization Controller of regulation and the second Polarization Controller, added by voltage source to phase-modulator
Pulse voltage, phase modulator modulation light pulse signal clockwise or light pulse signal counterclockwise are carried, is worked in phase-modulator
Voltage range, voltage source (typically since 0), gradually increase the modulation electricity of phase-modulator using Δ V as interval since negative value
Pressure, modulation voltage V and the luminous power P of the corresponding output of power meter are recorded respectively；Wherein, modulation voltage interval selection depends on measurement
Sensitivity requirement, voltage modulated scope at least cover a half-wave voltage, meanwhile, in order to ensure measurement accuracy, typically at least
Ask and arrive V 0πIn the range of at least take 10 to 20 points.
Step 6：The modulation voltage of phase-modulator is adjusted, the registration that power meter exports is denoted as after a maximum
Pmax, a registration minimum value of covering for power meter output, it is denoted as Pmin, complete DATA REASONING.
Step 7：According to the data of measurement, P is readmaxCorresponding modulation voltage, PminCorresponding modulation voltage, PmaxIt is corresponding
Modulation voltage and PminThe voltage difference of corresponding modulation voltage is surveyed half-wave voltage Vπ。
Step 8：When the Near The Extreme Point performance number in step 7 is close, it is difficult to precisely judge modulation electricity corresponding to extreme point
During pressure, adjacent maximum value minimum electricity can be obtained according to matched curve by drawing modulation voltage VS output power curves
Pressure, improve accuracy of measurement.I.e. for the measurement of half-wave voltage, it can also be obtained by curve matching, with respect to step 7, curve
Fitting process can improve measurement accuracy.Meanwhile power output is caused to cover maximum and most to voltage regulation limits are limited
The situation of small value, the method for curve matching are equally applicable.
It is as follows for above-mentioned steps 1 to step 8, its theory analysis process.
When pulse clockwise, counterclockwise closes beam at 3dB beam splitters again by Sagnac ring structures and interferes,
Interference strength expression formula is：
WhereinFor relative phase difference of the light pulse clockwise, counterclockwise in interference, meet：
In formula,Represent that pulse light path is different or device acts on the phase difference introduced,Represent that phase-modulator adds
Carry the phase difference that voltage introduces, VπFor half-wave voltage, V is modulation voltage.
When no voltage is applied, because both light pulse signal clockwise and light pulse signal counterclockwise are in Sagnac rings
Acted in structure by identical light path and device, thereforeNow phase-modulator introduce phase difference be alsoTherefore both relative phase differences areObtain interference maximum.
When applying voltage to phase-modulator,
Therefore have：
Consider in practical operation, because the device isolation degree with polarization isolation features is limited, so minimum is difficult to reach
To perfect 0 light intensity, it is contemplated that the presence of extreme value substrate, matched curve expression formula are：
Wherein PmaxFor the maximum in power meter measured data, PminFor the minimum value in power meter measured data, pass through
Modulation voltage V and the luminous power P of power meter output matched curve, obtain half-wave voltage Vπ.The present embodiment passes through matched curve
Maximum and minimum are optimized, obtain accurate half-wave voltage.
In the present embodiment, to the pulse voltage of phase-modulator loading, from -4.5V, gradually increase using 0.5V as interval
Phase modulator modulation voltage, to 4.5V, record modulation voltage and the corresponding output result of power meter.
As shown in Fig. 2 drawing modulation voltage VS output power curves, in experimentation, gained light intensity maximum is
1137nW, minimum value 18nW, bring formula (6) into.Curve matching expression formula is：
I.e. half-wave voltage is about 5.02V, consistent with the phase-modulator test result 5.0V that dispatches from the factory.
Particularly, when the undertension of voltage source is to cover a half-wave voltage, can by the way of curve matching,
Extreme point corresponding voltage value is obtained, half-wave voltage is tried to achieve with this.
Another embodiment, it is revised as on the basis of original structure：Outgoing position can be selected at 3dB beam splitters end
Directly exported at mouth B2, and circulator is saved, now because beam splitter coupling arm and straight-through arm have phase delay superposition,
So that light pulse signal, light pulse signal counterclockwise have phase difference π, i.e. test process and above-mentioned test in interference clockwise
During intensity variation trend on the contrary, obtain minimum when being not added with voltage, obtain maximum when loading half-wave voltage.
In this scheme, its theory analysis process is as follows.
Because the straight-through arm and coupling arm of beam splitter are poor in the presence of relative pi/2 phase, therefore light pulse signal and the inverse time clockwise
Both pin light pulse signals after Sagnac ring structures beam splitter port B2 output when,So：
Therefore have：
In practical operation, because the device isolation degree with polarization isolation features is limited, so minimum is difficult to have got to
U.S. 0 light intensity, it is contemplated that to the presence of extreme value substrate, matched curve expression formula is：
Wherein, PmaxFor the maximum in power meter measured data, PminFor the minimum value in power meter measured data, pass through
Modulation voltage V and the luminous power P of power meter output matched curve, obtain half-wave voltage Vπ。
For the present embodiment two, because when being not powered on pressure, power output is output minimum, it is difficult to determines Polarization Control
The regulating effect of device 1 and Polarization Controller 2, so needing first to apply voltage in a working range on phase-modulator so that
Power output is not 0.Hereafter the step 1 of embodiment one is can perform to step 8.
It the utility model is related to a kind of electro-optic phase modulator half-wave voltage measuring system.This electro-optic phase modulator half-wave
The first Polarization Controller and the second Polarization Controller of voltage measurement system make suitable to modulate 3dB beam splitters output light polarization
Hour hands light pulse is identical with phase modulator modulation direction with light pulse polarization counterclockwise, the light work(that raising system is modulated
Rate, improve interference maximum.Polarization beam apparatus is used to realize polarization selection index system, and not modulated polarized component is filtered out, dropped
Low interference minimum value.By the way that to extreme point optimal control, the utility model improves the sensitivity of extremum method measurement, and system is not
It is related to the expensive equipments such as optical-electrical converter, oscillograph, reaches the purpose for improving the measuring precision and reducing measurement cost.This reality
Measured with the new two kinds of different process half-wave voltage of phase modulator of titanium diffusion and proton exchange that are applicable to.
The scope of protection of the utility model includes but is not limited to embodiment of above, and the scope of protection of the utility model is to weigh
Sharp claim is defined, and any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement are each fallen within
The scope of protection of the utility model.
Claims (5)
- A kind of 1. electro-optic phase modulator half-wave voltage measuring system, it is characterised in that：Including pulse laser, circulator, divide Beam device, the first Polarization Controller, polarization selection device, phase-modulator, the second Polarization Controller, voltage source and power meter, institute Stating circulator includes port C1, port C2 and port C3, and the beam splitter is 2 × 2 3dB beam splitters, and the beam splitter includes Port B1, port B2, port B3 and port B4, the pulse laser are connected with the port C1 of the circulator, the annular The port C2 of device is connected with the port B1 of the beam splitter, and the port B4 of the beam splitter is connected with the first Polarization Controller, institute State the first Polarization Controller to be connected with polarization selection device, the polarization selection device is connected with phase-modulator, the voltage Source is connected with phase-modulator, and the phase-modulator is connected with the second Polarization Controller, and second Polarization Controller is with dividing The port B3 connections of beam device, the port C3 of the circulator are connected with power meter, and the port B2 of the beam splitter is vacant.
- 2. electro-optic phase modulator half-wave voltage measuring system according to claim 1, it is characterised in that：The beam splitter Port B4, the first Polarization Controller, polarization selection device, phase-modulator, the port of the second Polarization Controller and beam splitter B3 is sequentially connected so as to form Sagnac ring structures.
- 3. electro-optic phase modulator half-wave voltage measuring system according to claim 2, it is characterised in that：The polarization choosing It is polarization beam apparatus to select device, and the polarization beam apparatus includes port P1, port P2 and port P3, first Polarization Controller It is connected with the port P3 of polarization beam apparatus, the port P1 of the polarization beam apparatus is connected with phase-modulator, the polarization beam splitting The port P2 of device is vacant, and the port P3 of the polarization beam apparatus is to close Shu Duan, the tail of the P1 ports output of the polarization beam apparatus It is fine identical with the tail optical fiber type of phase-modulator.
- 4. electro-optic phase modulator half-wave voltage measuring system according to claim 2, it is characterised in that：The polarization choosing It is optical fiber analyzer to select device, and first Polarization Controller is connected by optical fiber analyzer with the phase-modulator, described The optical direction of optical fiber analyzer is identical with the modulating polarization direction of the phase-modulator.
- 5. the electro-optic phase modulator half-wave voltage measuring system according to claim 3 or 4, it is characterised in that：The ring Shape device, beam splitter, the first Polarization Controller and the second Polarization Controller are single-mode optical fiber pigtail device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121585A (en) * | 2017-06-30 | 2017-09-01 | 安徽问天量子科技股份有限公司 | A kind of electro-optic phase modulator half-wave voltage measuring system and measuring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121585A (en) * | 2017-06-30 | 2017-09-01 | 安徽问天量子科技股份有限公司 | A kind of electro-optic phase modulator half-wave voltage measuring system and measuring method |
| CN107121585B (en) * | 2017-06-30 | 2023-08-29 | 安徽问天量子科技股份有限公司 | Electro-optic phase modulator half-wave voltage measurement system and measurement method |
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