CN105659837B - Test macro and the method for testing of Y branch lithium niobate waveguides phase-modulator - Google Patents
Test macro and the method for testing of Y branch lithium niobate waveguides phase-modulatorInfo
- Publication number
- CN105659837B CN105659837B CN200710081856.6A CN200710081856A CN105659837B CN 105659837 B CN105659837 B CN 105659837B CN 200710081856 A CN200710081856 A CN 200710081856A CN 105659837 B CN105659837 B CN 105659837B
- Authority
- CN
- China
- Prior art keywords
- waveguide
- sampling
- modulator
- light
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
Test macro and the method for testing of Y branch lithium niobate waveguides phase-modulator. Light source couples light into the input of Y waveguide along separate routes by 1 × N single-mode optical-fibre coupler, and 2 export termination light power meter or extinction ratio tester. The output of light power meter or extinction ratio tester writes computer through data transmission system, according to test data fitting P ~ V nonlinear relationship formula, luminous power P after light power meter output voltage V is scaled to calibration, substitution formula is asked for Insertion loss fluctuation and the splitting ratio of Y waveguide. The periodic signal of the CF of needs, amplitude and waveform is added on the modulator electrode of Y waveguide, in the filtering of modulation signal wave band, the residuary intensity modulation of Y waveguide can be calculated. The present invention can carry out continuous sampling to data, monitors many Y waveguide devices continuously, measures luminous power, Insertion loss fluctuation, splitting ratio, polarization crosstalk, residuary intensity modulation equal parameter, and in sampling process, ensures that data are accurate.<pb pnum="1" />
Description
Technical field
The present invention relates to test macro and the method for testing of Y waveguide, for testing the insertion loss ripple of Y waveguideDynamic, splitting ratio, polarization crosstalk and residuary intensity modulation etc. The tail optical fiber of other integrated optical devices also can be testedPower output and polarization crosstalk equal parameter.
Background technology
Y branch lithium niobate waveguides phase-modulator is to move back by proton exchange on the lithium niobate crystal chip that X cuts Y biographyIgnition technique is produced the slab waveguide of Y branch shape. Utilize the electro-optical characteristic of lithium niobate material self, by outwardRefractive index in added electric field change waveguide section, thus the phase place of change guided wave, reaches the object of phase modulation.The residuary intensity modulation of Y waveguide is the additive effect of phase-modulation. When extra electric field changes guided wave phase placeMeanwhile, it is that luminous power changes that waveguide index changes in distribution makes Y waveguide loss change, and this variation veryLittle 10 of the light intensity that is equivalent to-2～10-4, be called residuary intensity modulation. In middle high-precision optical fiber gyro, there is literary compositionThis index of Zhang Jianyi is less than 10-2. Because the residuary intensity modulation of Y waveguide is more weak, accurately test exists oneDetermine difficulty.
Insertion loss, splitting ratio and polarization crosstalk are the major optical indexs of Y waveguide, and being affects its actual makingCritical technical parameter. Usual method of testing is as follows, by the light path of connection Fig. 1 Suo Shi, adjustable stable by polarizationLight source is drawn a polarization maintaining optical fibre, by Polarization Maintaining Optical Fiber Fusion Splicer by itself and the welding of Y waveguide input tail optical fiber. AdjustThe Y waveguide power output P that joint light source polarization state makes power meter read1、P2Till maximum, at Y waveguide oneOptical fiber is cut off from fusion point 10 cm place in side, with power meter reading input power Pin, by P1、P2、PinPut into formulae discovery insertion loss, splitting ratio. Polarization crosstalk test is that the light power meter in Fig. 1 is changed toExtinction ratio tester, is directly read the data of polarization crosstalk by tester. Often to consider in actual applicationsThe environmental test reliability of Y waveguide device, at this moment more pays close attention to the undulate quantity in process of the test of these indexsHow, above-mentioned method of testing monitoring of environmental experimentation middle finger target fluctuation situation efficiency is lower, and cannotRealize data continuous sampling.
Insertion loss formula:
Splitting ratio computing formula:
The centre wavelength that SLD light source exports light changes with power output. Due to light power meter built-in detectorSpectral response characteristic, to the radiant light explorer response rate difference of different wave length, causes detector output voltageV and actual light power are inconsistent, bring test error.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, and a kind of Y branch lithium niobate is providedTest macro and the method for testing of Waveguide Phase Modulator, can carry out continuous sampling to data, and monitoring is many continuouslyY waveguide device, measures Output optical power, Insertion loss fluctuation, splitting ratio, polarization crosstalk equal parameter,And in sampling process ensure test accuracy.
The technical problem that the present invention solves also comprises the test of residuary intensity modulation, in data handling procedure meritRate meter output voltage is converted to actual light power, avoids the error that detector wavelength response brings.
Technical solution of the present invention: the test macro of Y branch lithium niobate waveguides phase-modulator, its spyLevy and be: it mainly comprises light source, 1 × N fiber coupler, data sampling and treatment system, testing arrangement,Light wave transmissions to 1 after light source preheating × N fiber coupler, shunts to Y to be measured through 1 × N fiber couplerWaveguide, the output of Y waveguide sends data sampling and treatment system to, data sampling after being read by testing arrangementWith treatment system, respective handling and/or computational analysis are carried out to the parameter reading, obtained the property of Y waveguide to be measuredCan index.
The test macro of Y branch lithium niobate waveguides phase-modulator also comprises signal generator, signal generatorBe connected with Y waveguide modulator electrode, for applying modulation signal on Y waveguide.
When described testing arrangement is light power meter, after described data sampling and treatment system mainly comprisePut power amplifier, analog to digital conversion circuit, computer and sampling thereof and processing module, rearmounted power amplifierInput connect the output of light power meter, then through analog to digital conversion circuit post-sampling to computer, by sampling withProcessing module converts output voltage V to luminous power P, then calculates Insertion loss fluctuation according to luminous power PFluctuation situation with splitting ratio and splitting ratio thereof, shows result and preserves or carry out the test of residuary intensity modulationProcess.
When described testing arrangement is extinction ratio tester, described data sampling and treatment system are mainly wrappedDraw together GPIB cable, computer and sampling thereof and processing module, the output of computer sampling extinction ratio testerData, the data of being carried out polarization crosstalk by sampling and processing module are preserved and fluctuation situation analysis.
The method of testing of Y branch lithium niobate waveguides phase-modulator, is characterized in that comprising:
(1) light source divides couple light to Y waveguide through 1 × N fiber coupler, N can be tested simultaneously onlyY waveguide, when Y waveguide output connects light power meter, luminous power P is converted to and exports electricity by light power meterPress V, through data sampling and treatment system write computer, proceed to step (2), when Y waveguide exportsWhen connecing extinction ratio tester, extinction ratio tester by the polarization crosstalk result recording through data sampling and processingSystem is carried out the data preservation of polarization crosstalk and the processing of fluctuation situation analysis thereof;
(2) data sampling and treatment system convert output voltage V to light merit according to the relation of P ~ VRate P, then the fluctuation situation that calculates Insertion loss fluctuation and splitting ratio and splitting ratio thereof according to luminous power P,Show result and preserve or proceed to step (3) and carry out the test of residuary intensity modulation; Described P ~ VRelation is the luminous power P that obtains according to test and one group of data of output voltage V, carries out second order non-linearProperty fits the relational expression that obtains P ~ V;
(3) when the modulator electrode of Y waveguide connects signal generator, signal generator provides modulation signal,Select frequency, amplitude and waveform according to the practical application of Y waveguide, be added on Y waveguide modulator electrode;
(4) filtering in modulating frequency obtains to the luminous power P through ovennodulation for data sampling and treatment systemWave portion Δ P, calculates the mean value of luminous powerPut into formulaObtain the remnants of Y waveguideIntensity modulated.
The present invention's advantage is compared with prior art:
(1) the present invention is owing to increasing data sampling and treatment system in a test system, employs 1 × N lightFine coupler, achieves the continuous monitoring in environmental experiment process, and the master of many Y waveguides can be tested simultaneouslyWant optical parametric, comprise Insertion loss fluctuation, splitting ratio, polarization crosstalk etc.
(2) P ~ V relational expression according to light power meter after test sample of the present invention, exports V by detector and changesCalculate as luminous power P, avoid the measurement error causing because of the spectral response of detector, improve test accuracy.
(3) signal generator that increases in a test system of the present invention, combines with data sampling and treatment systemUse, residuary intensity modulation index can be tested exactly.
Accompanying drawing explanation
Fig. 1 is the conventional optical system for testing schematic diagram of insertion loss, splitting ratio;
Fig. 2 is test system structure schematic diagram of the present invention;
Fig. 3 is sampling of the present invention and processing module workflow diagram.
Detailed description of the invention
The test macro of Y branch lithium niobate waveguides phase-modulator (abbreviation Y waveguide), high stable SLD lightSource couples light into the input of Y waveguide along separate routes by 1 × N single-mode optical-fibre coupler, and 2 export termination lightPower meter or extinction ratio tester. The output of light power meter or extinction ratio tester writes through data transmission systemComputer. The centre wavelength of SLD light source light spectrum changes with power output, and power meter output voltage is to differenceThe response of wavelength there are differences, and therefore, when SLD power output varies in size, the output of light power meter is depositedAt a nonlinearity erron. This error is that the wavelength due to SLD light source (brings light with the difference of exciting currentChanged power) cause. Luminous power P guarantee after light power meter output voltage V is scaled to calibrationTest accurately. According to test data fitting luminous power P and output voltage V nonlinear relationship formula, VBe scaled P, with the luminous power P1 of 2 outputs, Insertion loss fluctuation and the light splitting that P2 asks for Y waveguideRatio. The periodic signal of specific (being determined by needs) frequency, amplitude and waveform is added in the modulation electricity of Y waveguideExtremely go up the optical power signals of above-mentioned test macro sampled output, in the filtering of modulation signal wave band, calculate YThe residuary intensity modulation of waveguide. This test macro can be monitored many measured devices automatically at environmental test (machineryVibration impact experiment or thermocycling) time stability.
This optic testing system basic block diagram as shown in Figure 2. This test macro comprise SLD stabilized light source,Data sampling and treatment system, 1 × N single-mode optical-fibre coupler, signal generator, light power meter or extinction ratioTester. First SLD light source preheating, shunts to Y waveguide to be measured through 1 × N coupler, Y waveguide tail optical fiberPower output and polarization crosstalk are read by light power meter and extinction ratio tester respectively. Data sampling processing sectionTest result is adopted into computer, the power meter output voltage of sampling is reverted to optical power value, put into formulaCalculate Insertion loss fluctuation and splitting ratio. Signal generator is added in modulation signal on Y waveguide, dataThe ripple components filtering in luminous power is separated in processing section, calculates luminous power mean value simultaneously, according toFormula is obtained residuary intensity modulation.
When Y waveguide output connects light power meter, data sampling and treatment system comprise rearmounted power amplifier,Data wire, analog to digital conversion circuit, computer and data sampling thereof and processing module. Rearmounted power amplifier,Data wire and analog to digital conversion circuit can commercially be purchased. The input of rearmounted power amplifier connects light power meterOutput, then through analog to digital conversion circuit post-sampling to computer, through sampling and processing module processing.
When Y waveguide output connects extinction ratio tester, data sampling and treatment system are without the need to rearmounted power amplificationDevice and analog to digital conversion circuit, computer is sampled the output data of extinction ratio tester through adopting by GPIB cableSample and processing module processing.
As shown in figures 1 and 3, the method for testing of Y waveguide comprises:
(1) light source divides couple light to Y waveguide through 1 × N fiber coupler, simultaneously test N Y waveguide,When Y waveguide output connects light power meter, luminous power P is converted to output voltage V by light power meter, through dataSampling and treatment system write computer, proceed to step (2), when Y waveguide output connects extinction ratio tester,Extinction ratio tester by the polarization crosstalk result recording through data sampling and treatment system carry out polarization crosstalk andFluctuation situation analysis is also preserved, and namely complete the test of polarization crosstalk, described polarization crosstalk fluctuation situation is exactlyThe maximum of polarization crosstalk and the difference of minimum of a value;
(2) power meter output voltage V samples computer through rearmounted amplification, D/A converting circuit, rootAccording to P ~ V relation, convert output voltage V to luminous power P, avoid due to detector spectral responseThe measurement error causing, provides Insertion loss fluctuation, splitting ratio and splitting ratio fluctuation thereof according to formula afterwardsSituation. Insertion loss fluctuation computing formulaSplitting ratio computing formula:P1、P2Be the luminous power of Y waveguide 2 outputs, the fluctuation of splitting ratio is the splitting ratio calculatingThe difference of maxima and minima. Luminous power P and output that described P ~ V relation obtains according to testOne group of data of voltage V, carry out second nonlinear and fit P ~ V relational expression and obtain;
(4) when the modulator electrode of Y waveguide connects signal generator, signal generator provides modulation signal,Select frequency, amplitude and waveform according to the practical application of Y waveguide, be added on Y waveguide modulator electrode;
(5) data sampling and treatment system to the actual light power meter P through ovennodulation in modulating frequencyFiltering obtains wave portion Δ P, calculates the mean value of luminous powerPut into formulaObtain YThe residuary intensity modulation of waveguide.
This test macro and method of testing can be monitored many measured devices automatically in environmental test (mechanical oscillationImpact test or thermocycling) time stability.
System described above is a kind of situation of the present invention, and those skilled in the art can according to differenceRequirement and design parameter carry out various supplements, improvement and replacing without deviating from the invention, therefore,The present invention is widely.
Claims (6)
- The test macro of 1.Y branch lithium niobate waveguides phase-modulator, is characterized in that: it mainly comprises lightSource, 1 × N fiber coupler, data sampling and treatment system, testing arrangement, light wave transmissions after light source preheatingTo 1 × N fiber coupler, shunt to Y waveguide to be measured through 1 × N fiber coupler, the output of Y waveguideAfter being read by testing arrangement, send data sampling and treatment system to, data sampling and treatment system are to readingParameter carry out respective handling and/or computational analysis, obtain the performance indications of Y waveguide to be measured.
- 2. the test macro of Y according to claim 1 branch lithium niobate waveguides phase-modulator, itsBe characterised in that: it also comprises signal generator, signal generator is connected with Y waveguide modulator electrode, forY waveguide applies modulation signal.
- 3. the test macro of Y according to claim 1 and 2 branch lithium niobate waveguides phase-modulator,It is characterized in that: when described testing arrangement is light power meter described data sampling and treatment system masterComprise rearmounted power amplifier, analog to digital conversion circuit, computer and sampling thereof and processing module, rearmounted meritThe input of rate amplifier connects the output of light power meter, and then process analog to digital conversion circuit post-sampling is to computer,Convert output voltage V to luminous power P by sampling and processing module, then calculate insertion according to luminous power PThe fluctuation situation of loss fluctuation and splitting ratio and splitting ratio thereof, shows result and preserves or carry out residual strength tuneThe test processes of system.
- 4. the test macro of Y according to claim 1 and 2 branch lithium niobate waveguides phase-modulator,It is characterized in that: when described testing arrangement is extinction ratio tester described data sampling and processing systemSystem mainly comprises GPIB cable, computer and sampling thereof and processing module, the test of computer sampling extinction ratioThe output data of instrument, the data of being carried out polarization crosstalk by sampling and processing module are preserved and fluctuation situation analysis.
- 5. the test macro of Y according to claim 1 branch lithium niobate waveguides phase-modulator, itsBe characterised in that: described light source is super-radiance light emitting diode SLD light source.
- The method of testing of 6.Y branch lithium niobate waveguides phase-modulator, is characterized in that comprising:(1) light source divides couple light to Y waveguide through 1 × N fiber coupler, N can be tested simultaneously onlyY waveguide, when Y waveguide output connects light power meter, luminous power P is converted to and exports electricity by light power meterPress V, through data sampling and treatment system write computer, proceed to step (2), when Y waveguide exportsWhen connecing extinction ratio tester, extinction ratio tester by the polarization crosstalk result recording through data sampling and processingSystem is carried out the data preservation of polarization crosstalk and the processing of fluctuation situation analysis thereof;(2) data sampling and treatment system convert output voltage V to light merit according to the relation of P ~ VRate P, then the fluctuation situation that calculates Insertion loss fluctuation and splitting ratio and splitting ratio thereof according to luminous power P,Show result and preserve or proceed to step (3) and carry out the test of residuary intensity modulation; Described P ~ VRelation is the luminous power P that obtains according to test and one group of data of output voltage V, carries out second order non-linearProperty fits the relational expression that obtains P ~ V;(3) when the modulator electrode of Y waveguide connects signal generator, signal generator provides modulation signal,Select frequency, amplitude and waveform according to the practical application of Y waveguide, be added on Y waveguide modulator electrode;(4) filtering in modulating frequency obtains to the luminous power P through ovennodulation for data sampling and treatment systemTo wave portion Δ P, calculate the mean value of luminous powerPut into formulaObtain Y waveguideResiduary intensity modulation.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105659837B true CN105659837B (en) | 2009-04-29 |
Family
ID=
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108106817A (en) * | 2017-12-11 | 2018-06-01 | 哈尔滨工程大学 | A kind of method for improving Y waveguide device polarization property measurement accuracy |
| CN108871563A (en) * | 2018-06-20 | 2018-11-23 | 深圳奥比中光科技有限公司 | Optical power detection system and method |
| CN115621839A (en) * | 2022-12-20 | 2023-01-17 | 北京世维通科技股份有限公司 | Laser device and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108106817A (en) * | 2017-12-11 | 2018-06-01 | 哈尔滨工程大学 | A kind of method for improving Y waveguide device polarization property measurement accuracy |
| CN108106817B (en) * | 2017-12-11 | 2019-12-24 | 哈尔滨工程大学 | Method for improving polarization performance measurement accuracy of Y waveguide device |
| CN108871563A (en) * | 2018-06-20 | 2018-11-23 | 深圳奥比中光科技有限公司 | Optical power detection system and method |
| CN115621839A (en) * | 2022-12-20 | 2023-01-17 | 北京世维通科技股份有限公司 | Laser device and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100340860C (en) | Optical fibre current transformer and its loop detector of transformer | |
| CN105651492A (en) | Laser line width measuring system and method based on electro-optic modulator and adjustable radio source | |
| CN103837188B (en) | A kind of photodetector frequency response measurement device and measuring method thereof | |
| CN101424708A (en) | Optical voltage transformer | |
| CN104568219A (en) | Temperature measurement device and method based on single-passband microwave photon filter | |
| CN102121851B (en) | Method for measuring length difference of array fibers | |
| Li et al. | Optical voltage sensor based on electrooptic crystal multiplier | |
| CN105444990A (en) | Dynamic correction apparatus and method for testing optical insertion loss and optical return loss | |
| CN101290248B (en) | Single-mode infra-red wavemeter based on Mach-Zehnder Interferometer filtering principle | |
| CN103616570A (en) | Self-correcting optoelectronic integration electric field sensor system | |
| CN110057544B (en) | Automatic measuring device and method for frequency response of photoelectric conversion module | |
| CN103605005B (en) | A kind of photoelectric integration electric-field measuring system based on two Y waveguides | |
| CN110132330B (en) | Double refraction distributed measuring system and method based on CP-phi OTDR | |
| CN111277325A (en) | Instantaneous frequency measurement method and system with adjustable measurement range based on polarization modulator | |
| CN105547336A (en) | Fiber grating sensing demodulation device and method on the basis of photoelectric oscillation loop | |
| CN105137201B (en) | A kind of optical fiber insulator insertion loss detector | |
| CN104132799A (en) | Ti-diffusion LiNbO3 phase modulator double-refraction modulation factor measurement device and method | |
| CN101319879A (en) | Method and device for fasting measuring size of optical fiber | |
| CN105659837B (en) | Test macro and the method for testing of Y branch lithium niobate waveguides phase-modulator | |
| EP1437586A1 (en) | Method and device for measuring half-wave voltage of mach-zehnder type optical modulator | |
| CN101608930B (en) | Realizing method of pi/2 phase bias of optical fiber interferometer | |
| US6421483B1 (en) | Optical monitoring in optical interferometric modulators | |
| CN111162835A (en) | Optical time domain reflectometer | |
| CN202994433U (en) | Y-type optical waveguide parameter measuring device | |
| CN111735610B (en) | Method and device for measuring refractive index of optical waveguide group |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| DC01 | Secret patent status has been lifted |