CN204405294U - A kind of dual channel optical performance proving installation simultaneously of Y waveguide device - Google Patents
A kind of dual channel optical performance proving installation simultaneously of Y waveguide device Download PDFInfo
- Publication number
- CN204405294U CN204405294U CN201420587770.6U CN201420587770U CN204405294U CN 204405294 U CN204405294 U CN 204405294U CN 201420587770 U CN201420587770 U CN 201420587770U CN 204405294 U CN204405294 U CN 204405294U
- Authority
- CN
- China
- Prior art keywords
- waveguide
- input end
- binary channels
- optical fiber
- optically coupled
- 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.)
- Expired - Fee Related
Links
Landscapes
- Optical Integrated Circuits (AREA)
Abstract
The utility model design belongs to optical device field of measuring technique, is specifically related to a kind of dual channel optical performance proving installation simultaneously of Y waveguide device.The dual channel optical performance proving installation simultaneously of Y waveguide device, comprise high polarization wide spectrum light source, integrated waveguide modulator to be measured and Y waveguide, binary channels optically coupled device, light path demodulating equipment, polarization crosstalk detection and pen recorder, binary channels optically coupled device first input end, first input end connects Y waveguide first passage output terminal, second channel output terminal, the light signal of two passages is merged into a road, is exported by output terminal and send into light path demodulating equipment.This proving installation makes the test of Y waveguide more simple and easy to do, and two of tested device output channel optical signal are a road by its device, then only can realize binary channels performance with a set of demodulated interferential instrument and measure simultaneously.This ensure that the consistance of test very well, improves measuring accuracy.
Description
Technical field
The utility model design belongs to optical device field of measuring technique, is specifically related to a kind of dual channel optical performance proving installation simultaneously of Y waveguide device.
Background technology
Fiber optical gyroscope is commonly called as " Y waveguide ", general employing lithium niobate material is as substrate, monomode optical waveguide, beam splitter, photomodulator and optical polarizator to carry out highly integrated by it, be the core devices of composition interference optical fiber top (FOG) and optical fiber current mutual inductor, decide the measuring accuracy of optical fiber sensing system, stability, volume and cost.
As the Primary Component of high-precision optical fine measuring instrument, itself performance parameter of Y waveguide, decides the measuring accuracy of instrument.The performance of Y waveguide is evaluated primarily of these parameters: waveguide chip extinction ratio, tail optical fiber cross-talk, output channel optical path difference, the temperature characterisitic etc. of above-mentioned parameter.Therefore, measuring the optical property of Y waveguide accurately, all sidedly, and evaluate Y waveguide performance, is the key problem that research and development high-precision optical fine measuring instrument needs solution early stage.In the accurate optical fibre gyro of high precision, it reaches the extinction ratio of 80dB to the Y waveguide performance requirement used.About the measurement and assessment of Y waveguide, existing kinds of schemes.Such as, a kind of method (CN 201310185490.2) improving extinction ratio of Y-waveguide chip for fiber-optic gyroscope that the Hua Yong of No.44 Inst., China Electronical Science and Technology Group Co., equality people of relaxing propose, can realize more than 80dB Y waveguide device.And conventional polarization property detecting instrument---extinction ratio tester, the Model4810 type polarization extinction ratio measuring instrument of dBm Optics company of the U.S. development that resolution is the highest also only has 72dB; The most High Extinction Ratio of PEM-330 type of the ERM102 type of General Photonics company of all the other U.S., the ER2200 type of Fiberpro company of Korea S, Japanese Santec company all can only reach about 50dB.It all cannot meet the demands
The nineties in 20th century, the people (US 4893931) such as French Herve Lefevre make public for the first time the OCDP system based on white light interference theory, and it adopts super-radiance light emitting diode (SLD) and space interference light path to measure structure.Just grow up gradually by the optical device method of testing of white light interferometric principle.
The people such as the Alfred Healy of Fibersense Technology Corporation company of the U.S. in 2002 disclose a kind of coupling process (US6870628) of I/O optical fiber of integrated waveguide chip, utilize white light interferometry method to achieve the measurement of the coupling cross-talk of waveguide chip I/O optical fiber; The people such as Yi little Su, Xiao Wen of BJ University of Aeronautics & Astronautics in 2004 disclose a kind of optical fibre gyro integrated optical modulator on-line testing method and proving installation (CN 200410003424.X) thereof, can realize the measurement of the optical parametrics such as the loss of device, splitting ratio; The people such as Yi little Su, Xu little Bin of BJ University of Aeronautics & Astronautics in 2007 disclose a kind of Y waveguide chip and polarization maintaining optical fibre online to shaft device and online to axle method (CN 200710064176.3), utilize interferometric spectrometry to achieve the measurement of waveguide chip and waveguide I/O fiber crosswalk equally.
2011, the people such as University Of Tianjin Zhang Hongxia disclose a kind of detection method and pick-up unit (CN 201110052231.3) of polarization extinction ratio of optical polarizer, same employing space interference light path is as the core apparatus of OCDP, by detecting the stiffness of coupling of Coupling point, derive polarization extinction ratio.This device is applicable to the multiple optical polarization devices such as polarization maintaining optical fibre, polarization-maintaining fiber coupler, polarizer.Compared with the scheme of the people such as Herve Lefevre, technical feature is close with index.
The same year, the people such as the Yao Xiaotian of AM General photoelectricity company (General Photonics Corporation) disclose a kind of all-fiber measuring system for distributed polarization crosstalk measurement in polarization maintaining optical fibre and optical birefringence material (US 20110277552, Measuring Distributed Polarization Crosstalk in Polarization Maintaining Fiber and Optical Birefringent Material), utilize and increased optical path delay device before light path correlator, suppress quantity and the amplitude of spuious white light interference signal during polarization crosstalk measurement.The polarization crosstalk sensitivity of all-fiber measuring system can be brought up to-95dB by the method, but dynamic range remains on 75dB.
2012, the polarization crosstalk that this seminar proposes based on all-fiber light path is measured proving installation (CN201210379406.6) and is improved the method (CN201210379407.0) of optical device polarization crosstalk measurement performance, solve the key technology problems of high precision white light interferometric, more than-the 95dB that the sensitivity that polarization crosstalk is measured improves, dynamic range correspondingly can remain on 95dB simultaneously, reduce the volume of test macro simultaneously, add Measurement sensibility.For the feature measurement of High Extinction Ratio Y waveguide device is laid a good foundation.2013, this seminar proposes a kind of optical property measuring method (CN201310739315.3) of multi-functional lithium niobate integrated device, system and comprehensively achieve super large extinction ratio measurement scope, the integrated waveguide of high spatial resolution measures and quantitative evaluation and application.
Traditional view is thought: optical property such as chip extinction ratio, the linear birefrigence of two output terminals of Y waveguide are consistent.But the research of actual test shows: the material and the manufacture craft that are limited to Y waveguide, and the optical property of two output channels may have different, and this manufacture craft for Analysis of Waveguide and parameter have very large meaning; Based on the Y waveguide measuring system of white light interferometric principle, only possess single pass power of test, when needing to measure two output channels of Y waveguide, must measure at twice; Particularly when external environment parameters (as temperature etc.) or application parameter (the electrode on-load voltage etc. as waveguide chip) change, twice single channel measurement and a binary channels are measured simultaneously, when extraneous loading environment and Measuring Time there are differences, cannot equivalence completely.Therefore, for the parameter of the different output channel of Y waveguide device, as: the absolute value of the optical characteristics such as waveguide chip extinction ratio, linear birefrigence, insertion loss, tail optical fiber cross-talk and difference value, have very great actual value.Therefore the development of the binary channels of Y waveguide simultaneously measuring technique, will be one of key improving high precision precision optics measuring element measuring accuracy further.2013, this seminar proposes a kind of dual channel optical performance testing device of integrated waveguide modulator and polarization crosstalk identification thereof and disposal route (CN201310744466.8), propose the apparatus and method that a kind of integrated waveguide modulator binary channels is measured simultaneously, it can carry out test and evaluation to Y waveguide two channel optical performances simultaneously.But in existing utility model technology, if will measure the dual channel optical performance of Y waveguide simultaneously, each output channel all needs a set of white light interferometer to carry out demodulation to light path, this just needs two cover demodulated interferential instrument light paths, if need to obtain good consistance, then require that the parameter of its composition device is all identical.In the proving installation of reality is built, be difficult to meet such requirement, always can there is fine difference after building in two cover interferometers, this species diversity can cause Y waveguide two channel optical Performance evaluation criterion of testing to have different.Therefore improving its structure and method of testing, eliminate the impact of this inconsistent otherness, thus improve the precision of the measurement of optical device, is necessary.
The utility model improves based on prior art, provide a kind of dual channel optical performance proving installation simultaneously of Y waveguide device, its design philosophy is: adopt fiber coupler that two of Y waveguide output channel output optical signals are merged into a road, then only adopt a set of white light interferometer demodulating equipment, demodulation can be measured to two passages simultaneously.The test curve of two passage is overlapping in a polarization crosstalk test curve, different by Y waveguide output channel tail optical fiber length, is distinguished the cross-talk peak value of these two passages.This device and method of testing simplify original device and testing process, improve measuring accuracy, have simplified system building cost, can be widely used in optical property quantitative test and the evaluation analysis of more than 85dB High Extinction Ratio integrated waveguide device.
Utility model content
The purpose of this utility model there are provided a kind of dual channel optical performance simultaneously proving installation of Y waveguide device, the dual channel optical performance that the purpose of this utility model is also the to provide a kind of Y waveguide device Y waveguide polarization crosstalk identification of proving installation simultaneously and disposal route.
The purpose of this utility model is achieved in that
The dual channel optical performance proving installation simultaneously of Y waveguide device, comprises high polarization wide spectrum light source, integrated waveguide modulator to be measured and Y waveguide, binary channels optically coupled device, light path demodulating equipment, polarization crosstalk detection and pen recorder,
Binary channels optically coupled device first input end, the second input end connects Y waveguide first passage output terminal, second channel output terminal, and the light signal of two passages is merged into a road, is exported send into light path demodulating equipment by output terminal;
The optical scanning platform of light path demodulating equipment carries out single pass, utilize built-in polarization crosstalk identification and Processing Algorithm, two the channel output end optical properties obtaining Y waveguide can be measured simultaneously, two passage polarization crosstalk curves of Y waveguide are presented in same scintigram and are overlapping, and protect inclined tail optical fiber, second channel output terminal protects the polarization crosstalk peak that inclined tail optical fiber length difference distinguished guarantee two passages and do not overlap by Y waveguide first passage output terminal.
The dual channel optical performance proving installation simultaneously of Y waveguide device, the annexation between its high polarization wide spectrum light source, integrated waveguide modulator to be measured and Y waveguide, binary channels optically coupled device, light path demodulating equipment is:
The first input end of binary channels optically coupled device, the second input end export with Y waveguide first passage to be measured and protect inclined tail optical fiber, Y waveguide second channel to be measured exports and protects inclined tail optical fiber and use rotary connector to be connected, and the output terminal of binary channels optically coupled device is connected with light path demodulating equipment; The input of Y waveguide input end to be measured is protected inclined tail optical fiber and the polarizer of high polarization wide spectrum light source and is exported and protect inclined tail optical fiber and use rotary connector to be connected.
Binary channels optically coupled device is a device be connected to each other by fiber coupler and analyzer, comprises first input end, the second input end and an output terminal; Binary channels optically coupled device can be made up of polarization-maintaining fiber coupler and analyzer; Connect the first input end of polarization-maintaining fiber coupler, the second input end as first input end, second input end of binary channels optically coupled device, the output terminal of polarization-maintaining fiber coupler is connected with the input tail optical fiber of analyzer, and its solder joint is 0 ° ~ 0 ° to shaft angle degree.
Binary channels optically coupled device is made up of single-mode optical-fibre coupler and the first analyzer, the second analyzer, the first input end of single-mode optical-fibre coupler, the second input end connect the first analyzer, the second analyzer respectively, the input end tail optical fiber of the first analyzer input end tail optical fiber, the second analyzer is respectively as the input end of binary channels optically coupled device, and the output terminal of single-mode optical-fibre coupler is as the output terminal of binary channels optically coupled device;
Compared with prior art, the utility model has the advantage of:
(1) this proving installation makes the test of Y waveguide more simple and easy to do, and two of tested device output channel optical signal are a road by its device, then only can realize binary channels performance with a set of demodulated interferential instrument and measure simultaneously.This ensure that the consistance of test very well, improves measuring accuracy;
(2) adopt this device, only need single pass just can test Y waveguide two passages simultaneously.This also greatly simplify testing procedure and testing process, improves testing efficiency;
(3) system uses full light path design to realize, and compare existing method structure more simple, number of elements is less, is easier to build.This also increases the reliability of system, and reduce cost, improve efficiency, there is less volume simultaneously, be more suitable for instrumentation and commercial applications.
Accompanying drawing explanation
Fig. 1 is to the schematic diagram of Y waveguide binary channels characteristic simultaneously proving installation based on the optical coherence domain polarization test system (OCDP) of white light interference theory.
Fig. 2 is that flashlight is merged into a road by the utility model, to the proving installation schematic diagram that Y waveguide dual channel optical performance is measured simultaneously.
Fig. 3 is two kinds of implementations of the utility model binary channels optically coupled device, is polarization-maintaining fiber coupler scheme and single-mode optical-fibre coupler scheme respectively.
Embodiment
For the device that the utility model integrated waveguide modulator (Y waveguide) dual output passage is measured and measuring method are clearly described simultaneously; the utility model is described in further detail with accompanying drawing in conjunction with the embodiments, but should not limit protection domain of the present utility model with this.
The utility model is measured while achieving the absolute value of the optical parameter such as waveguide chip extinction ratio, linear birefrigence, insertion loss, tail optical fiber cross-talk between device two output channels and difference value.
The utility model provides a kind of dual channel optical performance proving installation simultaneously of Y waveguide device, comprise high polarization wide spectrum light source 1, integrated waveguide modulator to be measured (Y waveguide) 2, binary channels optically coupled device 3, light path demodulating equipment 4, polarization crosstalk detection and pen recorder 5
1) binary channels optically coupled device 3 input end 311,312 connects first and second channel output end of Y waveguide 2B, 2C, and the light signal of two passages is merged into a road, is exported send into light path demodulating equipment 4 by output terminal 39;
2) the optical scanning platform 47 of light path demodulating equipment 4 carries out single pass, utilize built-in polarization crosstalk identification and Processing Algorithm, two the output channel 2B, the 2C optical property that obtain Y waveguide 2 can be measured simultaneously, two passage polarization crosstalk curves of Y waveguide 2 are presented in same scintigram and are overlapping, and the polarization crosstalk peak that the difference of protecting inclined tail optical fiber 22,23 length by first and second output channel 2B of Y waveguide 2,2C is distinguished guarantee two passages does not overlap.Its optical property comprises: the absolute value of the waveguide chip extinction ratio between Y waveguide device two output channel, linear birefrigence, insertion loss, tail optical fiber cross-talk carries out measuring, outside Storage & Display, also will compare first and second output channel 2B, the 2C performance difference when external environment parameters (as temperature etc.) or application parameter (the electrode on-load voltage etc. as waveguide chip) change and show;
Binary channels optically coupled device 3:
1) binary channels optically coupled device 3 is the devices be connected to each other by fiber coupler and analyzer, has two input ends, 311,312 and output terminal 39;
2) binary channels optically coupled device 3 can be made up of polarization-maintaining fiber coupler 341 and analyzer 37; Its annexation is:
Connect the input end 311,312 of two input ends 311,312 as binary channels optically coupled device of polarization-maintaining fiber coupler 341, output terminal 35 is connected with the input tail optical fiber 36 of analyzer 37, and its solder joint is 0 ° ~ 0 ° to shaft angle degree;
Described binary channels optically coupled device 3:
Binary channels optically coupled device 3 also can be made up of single-mode optical-fibre coupler 342 and analyzer 32,33; Its annexation is:
Two input ends 321,331 of single-mode optical-fibre coupler 342 connect analyzer 32,33 respectively, the input end tail optical fiber 311,312 of analyzer 32,33 is respectively as the input end 311,312 of binary channels optically coupled device 3, and the output terminal of single-mode optical-fibre coupler 342 is as the output terminal 39 of binary channels optically coupled device;
The dual channel optical performance proving installation simultaneously of described Y waveguide device 2, the annexation between its high polarization wide spectrum light source 1, integrated waveguide modulator to be measured (Y waveguide) 2, binary channels optically coupled device 3, light path demodulating equipment 4, is characterized in that:
1) input end 311,312 and first and second passage of Y waveguide to be measured 2B, 2C of binary channels optically coupled device 3 export and protect inclined tail optical fiber 22,23 and use rotary connector to be connected, and output terminal 39 is connected with light path demodulating equipment 4;
2) input of Y waveguide 2 input end 2A to be measured is protected inclined tail optical fiber 21 and the polarizer 18 of high polarization wide spectrum light source 1 and is exported and protect inclined tail optical fiber 19 and use rotary connector to be connected;
Described Y waveguide 2 polarization crosstalk identification and Processing Algorithm:
1) the input channel 2A of Y waveguide 2 protects inclined tail optical fiber 21 length l
w-iexport with first and second passage 2B, 2C and protect inclined tail optical fiber length l
w-o-1, l
w-o-2the light path produced, is required to meet following formula respectively:
S
W-i＝l
W-i×Δn
f>S
ripple(1)
S
w-o-1=l
w-o-1× Δ n
fand S
w-o-2=l
w-o-2× Δ n
f>S
w=l
w× Δ n
w(2)
S
w-o-1>S
w-o-2>S
rippleor S
w-o-2>S
w-o-1>S
ripple(3)
Wherein, Δ n
ffor protecting inclined tail optical fiber linear birefrigence, Δ n
wthe linear birefrigence of waveguide chip, S
ripplefor the light path maximal value of light source (11) Secondary coherence peak, S
wit is the optical path difference between waveguide chip fast and slow axis.
2) if do not meet above-mentioned condition, then need, need to extend polarization maintaining optical fibre length to its welding respectively and be respectively l
f-i, l
f-o-1, l
f-o-2, and 0 ° ~ 0 ° is to shaft angle degree, and meet following formula:
S
f-i＝l
f-i×Δn
f>S
ripple(4)
S
f-o-1=l
f-o-1× Δ n
fand S
f-o-2=l
f-o-1× Δ n
f>S
w=l
w× Δ n
w(5)
S
f-o-1>S
f-o-2>S
rippleor S
f-o-2>S
f-o-1>S
ripple(6)
3) measure and record that inclined tail optical fiber length is protected in Y waveguide input, input tail optical fiber extend protect inclined tail optical fiber length, waveguide chip length, export protect inclined tail optical fiber length, export extend protect inclined tail optical fiber length, two passages export tail optical fiber differences in length, two passages export to extend and protect inclined tail optical fiber differences in length and record, its value is respectively input polarization maintaining optical fibre 21 length l
w-i, input extends polarization maintaining optical fibre length l
f-i, waveguide chip 2D length l
w, first and second output channel tail optical fiber 22,23 of waveguide length l
w-o-1, l
w-o-2, export and protect inclined tail optical fiber extended fiber length l
f-o-1, l
f-o-2, and calculate its optical path delay amount separately;
4) connect light path according to installation drawing, make rotary connector 20,301,302 pairs of shaft angle degree be 0 ° ~ 0 °; Start light path scan table 47 to scan, obtain Y waveguide 2 Noise Background data to be measured;
Operation rotary connector 20,301,302, makes it be respectively 0 ° ~ 45 °, 45 ° ~ 0 °, 45 ° ~ 0 ° to shaft angle degree, starts light path scan table 47, can draw Y waveguide binary channels polarization crosstalk distribution curve by single pass.Two passage polarization crosstalk curves overlapped of Y waveguide 2 are in a scanning curve figure, because Y waveguide (2) first and second output channel 2B, 2C tail optical fiber length or the inclined tail optical fiber length of output prolongation guarantor are variant, so stagger in the distribution at two passage polarization crosstalk curve cross-talk peaks of Y waveguide 2, it is in polarization crosstalk curve map, its size is unequal, S
ripplethan S
f-o-2, S
f-o-1, S
f-iall little, ripple peak so just can be avoided the impact of test result.And S
f-iand S
f-o-2, S
f-o-1size is also unequal, can well be distinguished at polarization crosstalk peak like this.Without loss of generality, the order of its arrangement can be: S
ripple<S
f-o-1<S
f-o-2<S
f-ior S
ripple<S
f-o-2<S
f-o-1<S
f-i;
5) when external environment parameters (temperature etc.) or application parameter (on-load voltage etc.) change time, remeasure the optical parametric performance of Y waveguide, the change of two channel optical characteristics with parameter change can be measured.
The utility model is to based on the technological improvement of white light interference theory to a kind of integrated waveguide device binary channels simultaneous measuring apparatus.Proving installation figure is as shown in Figure 1 simultaneously for the dual channel optical performance of this integrated waveguide modulator, in the process that Y waveguide is tested, the light signal that high polarization wide spectrum light source sends, through Y waveguide and input and output tail optical fiber thereof and tail optical fiber extended fiber, enters white light interferometer.Two corresponding two cover light path demodulating equipments of passage, share same light path scanner.Light path scan table, by single pass, can obtain the white light interference signal of two cover light path demodulating equipments, the optical property of the corresponding Y waveguide of this two width figure two passages.In this device, require that the demodulated interferential instrument light channel structure of two passages, element and device parameters are all identical.But build in use in reality, be difficult to ensure above requirement completely, always can there is fine difference in two cover interferometers, thus cause Y waveguide two the channel optical Performance evaluation criterion tested out to have different.Therefore improve its structure and method of testing, eliminate the impact of this fine difference, be necessary for the precision improving test component.
And installation drawing of the present utility model as shown in Figure 2.Fig. 2 shown device is under the control of computer for controlling, the mobile mirror of Mach-Zehnder interferometer carries out light path scanning, make interferometer two-arm optical path difference from Δ nl through zero passage, be scanned up to-Δ nl, run-down can obtain the optical characteristic test curve of Y waveguide two passages.Its expression formula is as follows:
In formula: S represents light path delayed sweep amount, the normalization self-coherence function that R (S) is wide spectrum light source, R (0)=1, the white light interference Peak signal amplitude of transmission light, optical path difference is zero; R (S)=0 (S>S
0time, S
0coherent length for wide spectrum light source); S
f-i, S
f-o-1, S
f-o-2, S
w-i, S
w-o-1, S
w-o-2, S
w-1, S
w-2be respectively the optical path delay amount inputting extended fiber, first passage output extended fiber, second channel output extended fiber, input tail optical fiber, first passage output tail optical fiber, second channel output tail optical fiber, waveguide chip first passage and second channel.When slow axis light path is ahead of fast axial light journey, above-mentioned retardation is defined as+; When slow axis light path lags behind fast axial light journey, above-mentioned retardation is defined as-, each optical path delay amount can be expressed as successively:
S
f-i＝l
f-i×Δn
f
S
W-i＝l
W-i×Δn
f
S
f-o-1＝l
f-o-1×Δn
f
S
f-o-2＝l
f-o-2×Δn
f
S
W-o-1＝l
W-o-1×Δn
f(8)
S
W-o-2＝l
W-o-2×Δn
f
S
W＝l
W×Δn
W
S
ripple＝2l
SLD×n
S
S
i＝l
i×Δn
i
In formula, l
f-i, l
f-o-1, l
f-o-2, l
w-i, l
w-o-1, l
w-o-2, l
wbe respectively the length inputting extended fiber, first passage output extended fiber, second channel output extended fiber, input tail optical fiber, first passage output tail optical fiber, second channel output tail optical fiber and waveguide chip, Δ n
f, Δ n
wbe respectively the linear birefrigence of polarization maintaining optical fibre and waveguide chip; S
ripplefor the optical path difference of light source light spectrum ripple coherence peak, its active area to SLD light source and refractive index length are directly proportional, S
ifor the optical path delay amount of the interference peak that other optical defects existed in white light interference proving installation 3 cause; ρ
f-i, ρ
f-o-1, ρ
f-o-2be respectively the cross-talk amplitude amplitude of the solder joint of the solder joint of input extended fiber and waveguide input optical fibre, the first and second passages output extended fibers and waveguide output optical fibre, ρ
w-i, ρ
w-o-1, ρ
w-o-2be respectively the cross-talk amplitude amplitude that is coupled of waveguide input the/the first second channel output optical fibre and waveguide chip, ε
chipfor the amplitude amplitude of Y waveguide extinction ratio, ρ
ripplefor the coherence peak amplitude that light source light spectrum ripple causes; ρ
ifor the interference peak amplitude that the optical defect existed in white light interference proving installation 3 causes.
From above formula, if record length and the birefringence thereof of light path various piece element, by the scanning of white light interferometric device light path, at optical path delay amount ± S
f-i, ± S
f-o-1, ± S
f-o-2, ± (S
f-i+ S
w-i), ± (S
f-o-1+ S
w-o-1), ± (S
f-o-2+ S
w-o-2), ± (S
f-o-1+ S
w-o-1+ S
f-i+ S
w-i+ S
w-1), ± (S
f-o-2+ S
w-o-2+ S
f-i+ S
w-i+ S
w-2) place can obtain white light interference peak value.Two passage polarization crosstalk curves overlapped are in a scanning curve figure, due to first and second output channel tail optical fiber length of Y waveguide or export extend protect inclined tail optical fiber length variant, so stagger in the distribution at two passage polarization crosstalk curve cross-talk peaks of Y waveguide, it is in polarization crosstalk curve map, its size is unequal, S
ripplethan S
f-o-2, S
f-o-1, S
f-iall little, ripple peak so just can be avoided the impact of test result.And S
f-iand S
f-o-2, S
f-o-1size is also unequal, can well be distinguished at polarization crosstalk peak like this.Without loss of generality, the order of its arrangement can be: S
ripple<S
f-o-1<S
f-o-2<S
f-ior <S
ripple<S
f-o-2<S
f-o-1<S
f-i.
Connected mode: before to Y waveguide test, need device exact connect ion.As shown in Figure 2, Y waveguide 2 to be measured is accessed proving installation, be connected with rotary connector 20 between Y waveguide input channel 2A tail optical fiber 21 and the polarizer of high polarization wide spectrum light source 1, Y waveguide output channel 2B, 2C use rotary connector to be connected with binary channels optically coupled device 3 input end 31,32 respectively; Binary channels optically coupled device adopts the connected mode as Fig. 2, and use 1 × 2 polarization-maintaining fiber coupler, weld between output terminal 34 with analyzer 36, solder joint is 0 ° ~ 0 ° to shaft angle degree; Other parts of device are according to connecting as shown in the figure.
Device parameters is selected:
(1) the centre wavelength 1550nm of wideband light source 11, half spectral width are greater than 45nm, and fiber power is greater than 2mW, light source light spectrum ripple <0.05dB (peak amplitude is approximately-60dB), the light path scope 4 ~ 7mm at relevant peak; Half spectral width of DFB light source 311 is less than 50MHz, and fiber power is greater than 1mW;
(2) 2/98 fiber coupler 12 operation wavelength 1550nm, splitting ratio 2:98;
(3) fibre optic isolater 16 operation wavelength 1550nm, insertion loss 0.8dB, isolation >35dB;
(4) the optical fiber polarizer 18, the operation wavelength of optical fiber analyzer 502 is 1550nm, and extinction ratio is 30dB, and insertion loss is less than 1dB;
(5) single-mode optical-fibre coupler 41,48 parameter is identical, and operation wavelength is 1310/1550nm, splitting ratio 50:50; Polarization-maintaining fiber coupler 37 operation wavelength is 1310/1550nm;
(6) optical fiber circulator is three-port circulator, insertion loss 1dB, and return loss is greater than 55dB;
(7) operation wavelength of fiber collimating lenses 46 is 1550nm, light path scanning distance between it and light path scanner 47 (reflectivity is more than 92%) changes greatly between 0 ~ 200mm, average insertion loss is 2.0dB, within loss fluctuation ± 0.2dB, and when light path scanner 47 is approximately in 100mm position, the two-arm optical path difference of light path demodulating equipment 4 is approximately zero;
(8) differential detector 491,492 photochromics is InGaAs, and photodetection scope is 1100 ~ 1700nm, and responsiveness is greater than 0.85;
(9) select Y waveguide device 2 to be measured, its operation wavelength is 1550nm, and waveguide tail optical fiber slow axis is aimed at the fast axle of waveguide chip, waveguide chip length 20mm.
Test job flow process:
(1) Y waveguide input tail optical fiber length l is first measured
w-i, judge its optical path difference S produced
w-iwhether be greater than light source light spectrum ripple to be concerned with peak light path S
rippleif do not met, then need welding one elongated segment optical fiber l
f-i, and require S
f-i>S
w.Then record input tail optical fiber length l
w-i;
(2) measure and record the length l of Y waveguide chip
w;
(3) measure first and second passage 2B, 2C and export the inclined tail optical fiber length l of guarantor
w-o-1, l
w-o-2the light path produced, is required to meet: S respectively
w-i=l
w-i× Δ n
f>S
ripple; S
w-o-1=l
w-o-1× Δ n
fand S
w-o-2=l
w-o-2× Δ n
f>S
w=l
w× Δ n
w; S
w-o-1>S
w-o-2>S
rippleor S
w-o-2>S
w-o-1>S
ripple.If do not meet above-mentioned condition, then need to extend polarization maintaining optical fibre length to its welding and be respectively l
f-i, l
f-o-1, l
f-o-2, 0 ° ~ 0 ° is to shaft angle degree.Its size of its light path is unequal, S
ripplethan S
f-o-2, S
f-o-1, S
f-iall little, ripple peak so just can be avoided the impact of test result.And S
f-iand S
f-o-2, S
f-o-1size is also unequal, can well distinguish like this.Without loss of generality, the order of its arrangement is got: S
ripple<S
f-o-1<S
f-o-2<S
f-i;
(4) measure and record that inclined tail optical fiber length is protected in Y waveguide input, input tail optical fiber extend protect inclined tail optical fiber length, waveguide chip length, export protect inclined tail optical fiber length, export extend protect inclined tail optical fiber length, two passages export tail optical fiber differences in length, two passages export to extend and protect inclined tail optical fiber differences in length and record, its value is respectively input polarization maintaining optical fibre 21 length l
w-i, input extends polarization maintaining optical fibre length l
f-i, waveguide chip 2D length l
w, first and second output channel tail optical fiber 22,23 of waveguide length l
w-o-1, l
w-o-2, export and protect inclined tail optical fiber extended fiber length l
f-o-1, l
f-o-2, and calculate its optical path delay amount separately;
(5) connect light path according to installation drawing, make rotary connector 20,301,302 pairs of shaft angle degree be 0 ° ~ 0 °; Start light path scan table 47 to scan, obtain Y waveguide 2 Noise Background data to be measured;
Operation rotary connector 20,301,302, makes it be respectively 0 ° ~ 45 °, 45 ° ~ 0 °, 45 ° ~ 0 ° to shaft angle degree, starts light path scan table 47, can draw Y waveguide binary channels polarization crosstalk distribution curve by single pass.Two passage polarization crosstalk curves overlapped of Y waveguide 2 are in a scanning curve figure, because first and second output channel 2B of Y waveguide 2,2C tail optical fiber length or the inclined tail optical fiber length of output prolongation guarantor are variant, so stagger in the distribution at two passage polarization crosstalk curve cross-talk peaks of Y waveguide 2, it is in polarization crosstalk curve map, its arrangement order then: S
ripple<S
f-o-1<S
f-o-2<S
f-i;
(6) when external environment parameters (temperature etc.) or application parameter (on-load voltage etc.) change time, remeasure the optical parametric performance of Y waveguide, the change of two channel optical characteristics with parameter change can be measured.
Embodiment 1:
1, a kind of dual channel optical performance of Y waveguide device proving installation simultaneously, comprise high polarization wide spectrum light source (1), integrated waveguide modulator to be measured (Y waveguide) (2), binary channels optically coupled device (3), light path demodulating equipment (4), polarization crosstalk detection and pen recorder (5), it is characterized in that:
1) binary channels optically coupled device (3) input end (311,312) Y waveguide first output terminal (2B), second channel output terminal (2C) is connected, the light signal of two passages is merged into a road, is exported by output terminal (39) and send into light path demodulating equipment (4);
2) the optical scanning platform (47) of light path demodulating equipment (4) carries out single pass, utilize built-in polarization crosstalk identification and Processing Algorithm, the first output terminal (2B) obtaining Y waveguide (2) can be measured simultaneously, second channel output terminal (2C) optical property, two passage polarization crosstalk curves of Y waveguide (2) are presented in same scintigram and are overlapping, inclined tail optical fiber (22) is protected by Y waveguide (2) first output terminal (2B), the polarization crosstalk peak that the difference that second channel output terminal (2C) protects inclined tail optical fiber (23) length is distinguished guarantee two passages does not overlap.Its optical property comprises: the absolute value of the waveguide chip extinction ratio between Y waveguide device two output channel, linear birefrigence, insertion loss, tail optical fiber cross-talk carries out measuring, outside Storage & Display, also will compare the first output terminal (2B), second channel output terminal (2C) performance difference when external environment parameters (as temperature etc.) or application parameter (the electrode on-load voltage etc. as waveguide chip) change and show;
2, by binary channels optically coupled device (3) according to claim 1, it is characterized in that:
1) binary channels optically coupled device (3) is a device be connected to each other by fiber coupler and analyzer, has two input ends (311,312) and an output terminal (39);
2) binary channels optically coupled device (3) can be made up of polarization-maintaining fiber coupler (341) and analyzer (37); Its annexation is:
Connect two input ends (311 of polarization-maintaining fiber coupler (341), 312) as the input end (311 of binary channels optically coupled device, 312), output terminal (35) is connected with the input tail optical fiber (36) of analyzer (37), and its solder joint is 0 ° ~ 0 ° to shaft angle degree;
3, by binary channels optically coupled device (3) according to claim 1, it is characterized in that:
Binary channels optically coupled device (3) also can be made up of single-mode optical-fibre coupler (342) and analyzer (32,33); Its annexation is:
Two input ends (321 of single-mode optical-fibre coupler (342), 331) analyzer (32 is connected respectively, 33), analyzer (32,33) input end tail optical fiber (311,312) respectively as the input end (311,312) of binary channels optically coupled device (3), the output terminal of single-mode optical-fibre coupler (342) is as the output terminal (39) of binary channels optically coupled device;
4, by the dual channel optical performance proving installation simultaneously of claim 1 and Y waveguide device according to claim 2, annexation between its high polarization wide spectrum light source (1), integrated waveguide modulator to be measured (Y waveguide) (2), binary channels optically coupled device (3), light path demodulating equipment (4), is characterized in that:
1) input end (311 of binary channels optically coupled device (3), 312) with first and second passage of Y waveguide to be measured (2B, 2C) export the inclined tail optical fiber (22 of guarantor, 23) use rotary connector to connect, output terminal (39) is connected with light path demodulating equipment (4);
2) input of Y waveguide to be measured (2) input end (2A) is protected inclined tail optical fiber (21) and the polarizer (18) of high polarization wide spectrum light source (1) and is exported and protect inclined tail optical fiber (19) and use rotary connector to be connected;
5, by Y waveguide according to claim 1 (2) polarization crosstalk identification and Processing Algorithm, it is characterized in that:
1) input channel (2A) of Y waveguide (2) protects inclined tail optical fiber (21) length l
w-iexport with first and second passage (2B, 2C) and protect inclined tail optical fiber length l
w-o-1, l
w-o-2the light path produced, is required to meet following formula respectively:
S
W-i＝l
W-i×Δn
f>S
ripple(1)
S
w-o-1=l
w-o-1× Δ n
fand S
w-o-2=l
w-o-2× Δ n
f>S
w=l
w× Δ n
w(2)
S
w-o-1>S
w-o-2>S
rippleor S
w-o-2>S
w-o-1>S
ripple(3)
Wherein, Δ n
ffor protecting inclined tail optical fiber linear birefrigence, Δ n
wthe linear birefrigence of waveguide chip, S
ripplefor the light path maximal value of light source (11) Secondary coherence peak, S
wit is the optical path difference between waveguide chip fast and slow axis.
2) if do not meet above-mentioned condition, then need, need to extend polarization maintaining optical fibre length to its welding respectively and be respectively l
f-i, l
f-o-1, l
f-o-2, and 0 ° ~ 0 ° is to shaft angle degree, and meet following formula:
S
f-i＝l
f-i×Δn
f>S
ripple(4)
S
f-o-1=l
f-o-1× Δ n
fand S
f-o-2=l
f-o-1× Δ n
f>S
w=l
w× Δ n
w(5)
S
f-o-1>S
f-o-2>S
rippleor S
f-o-2>S
f-o-1>S
ripple(6)
3) measure and record that inclined tail optical fiber length is protected in Y waveguide input, input tail optical fiber extend protect inclined tail optical fiber length, waveguide chip length, export protect inclined tail optical fiber length, export extend protect inclined tail optical fiber length, two passages export tail optical fiber differences in length, two passages export to extend and protect inclined tail optical fiber differences in length and record, its value is respectively input polarization maintaining optical fibre (21) length l
w-i, input extends polarization maintaining optical fibre length l
f-i, waveguide chip (2D) length l
w, first and second output channel tail optical fiber of waveguide (22,23) length l
w-o-1, l
w-o-2, export and protect inclined tail optical fiber extended fiber length l
f-o-1, l
f-o-2, and calculate its optical path delay amount separately;
4) connect light path according to installation drawing, make rotary connector (20,301,302) be 0 ° ~ 0 ° to shaft angle degree; Start light path scan table (47) scanning, obtain Y waveguide to be measured (2) Noise Background data;
Operation rotary connector (20,301,302) it, is made to be respectively 0 ° ~ 45 °, 45 ° ~ 0 °, 45 ° ~ 0 ° to shaft angle degree, start light path scan table (47), Y waveguide binary channels polarization crosstalk distribution curve can be drawn by single pass.Two passage polarization crosstalk curves overlapped of Y waveguide (2) are in a scanning curve figure, due to Y waveguide (2) first and second output channel (2B, 2C) tail optical fiber length or export extend protect inclined tail optical fiber length variant, so stagger in the distribution at two passage polarization crosstalk curve cross-talk peaks of Y waveguide (2), it is in polarization crosstalk curve map, its size is unequal, S
ripplethan S
f-o-2, S
f-o-1, S
f-iall little, ripple peak so just can be avoided the impact of test result.And S
f-iand S
f-o-2, S
f-o-1size is also unequal, can well be distinguished at different polarization crosstalk peaks like this.Without loss of generality, the order of its arrangement can be: S
ripple<S
f-o-1<S
f-o-2<S
f-ior S
ripple<S
f-o-2<S
f-o-1<S
f-i;
5) when external environment parameters (temperature etc.) or application parameter (on-load voltage etc.) change time, remeasure the optical parametric performance of Y waveguide, the change of two channel optical characteristics with parameter change can be measured.
Claims (3)
1. the dual channel optical performance of Y waveguide device proving installation simultaneously, comprise high polarization wide spectrum light source (1), integrated waveguide modulator to be measured and Y waveguide (2), binary channels optically coupled device (3), light path demodulating equipment (4), polarization crosstalk detection and pen recorder (5), it is characterized in that:
Binary channels optically coupled device (3) first input end (311), second input end (312) connects Y waveguide first passage output terminal (2B), second channel output terminal (2C), the light signal of two passages is merged into a road, is exported by output terminal (39) and send into light path demodulating equipment (4);
The optical scanning platform (47) of light path demodulating equipment (4) carries out single pass, two the channel output end optical properties obtaining Y waveguide (2) can be measured simultaneously, two passage polarization crosstalk curves of Y waveguide (2) are presented in same scintigram and are overlapping, and protect inclined tail optical fiber (22), second channel output terminal protects the polarization crosstalk peak that inclined tail optical fiber (23) length difference distinguished guarantee two passages and do not overlap by Y waveguide (2) first passage output terminal;
The dual channel optical performance of Y waveguide device is proving installation simultaneously, and the annexation between its high polarization wide spectrum light source (1), integrated waveguide modulator to be measured and Y waveguide (2), binary channels optically coupled device (3), light path demodulating equipment (4) is:
The first input end (311) of binary channels optically coupled device (3), the second input end (312) export with Y waveguide first passage to be measured and protect inclined tail optical fiber, Y waveguide second channel to be measured exports and protects inclined tail optical fiber and use rotary connector to be connected, and the output terminal (39) of binary channels optically coupled device is connected with light path demodulating equipment (4); The input of Y waveguide to be measured (2) input end (2A) is protected inclined tail optical fiber (21) and the polarizer (18) of high polarization wide spectrum light source (1) and is exported and protect inclined tail optical fiber (19) and use rotary connector to be connected.
2. the dual channel optical performance of a kind of Y waveguide device according to claim 1 proving installation simultaneously, it is characterized in that, described binary channels optically coupled device (3) is a device be connected to each other by fiber coupler and analyzer, comprise first input end (311), the second input end (312) and an output terminal (39); Binary channels optically coupled device (3) can be made up of polarization-maintaining fiber coupler (341) and analyzer (37); Connect the first input end (311) of polarization-maintaining fiber coupler (341), the second input end (312) as first input end (311), second input end (312) of binary channels optically coupled device, the output terminal (35) of polarization-maintaining fiber coupler is connected with the input tail optical fiber (36) of analyzer (37), and its solder joint is 0 ° ~ 0 ° to shaft angle degree.
3. the dual channel optical performance of a kind of Y waveguide device according to claim 1 proving installation simultaneously, it is characterized in that: binary channels optically coupled device (3) is by single-mode optical-fibre coupler (342) and the first analyzer (32), second analyzer (33) is formed, the first input end (321) of single-mode optical-fibre coupler (342), second input end (331) connects the first analyzer (32) respectively, second analyzer (33), first analyzer (32) input end tail optical fiber (311), the input end tail optical fiber (312) of the second analyzer (33) is respectively as the input end of binary channels optically coupled device (3), the output terminal of single-mode optical-fibre coupler (342) is as the output terminal (39) of binary channels optically coupled device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420587770.6U CN204405294U (en) | 2014-10-11 | 2014-10-11 | A kind of dual channel optical performance proving installation simultaneously of Y waveguide device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420587770.6U CN204405294U (en) | 2014-10-11 | 2014-10-11 | A kind of dual channel optical performance proving installation simultaneously of Y waveguide device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204405294U true CN204405294U (en) | 2015-06-17 |
Family
ID=53429144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420587770.6U Expired - Fee Related CN204405294U (en) | 2014-10-11 | 2014-10-11 | A kind of dual channel optical performance proving installation simultaneously of Y waveguide device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204405294U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953817A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Method for assembling core sensitive optical path of optical fiber gyro |
| CN111912400A (en) * | 2020-07-30 | 2020-11-10 | 广东工业大学 | Polarization-maintaining optical fiber ring distributed polarization crosstalk bidirectional simultaneous measurement device and method |
-
2014
- 2014-10-11 CN CN201420587770.6U patent/CN204405294U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953817A (en) * | 2016-04-26 | 2016-09-21 | 哈尔滨工程大学 | Method for assembling core sensitive optical path of optical fiber gyro |
| CN111912400A (en) * | 2020-07-30 | 2020-11-10 | 广东工业大学 | Polarization-maintaining optical fiber ring distributed polarization crosstalk bidirectional simultaneous measurement device and method |
| CN111912400B (en) * | 2020-07-30 | 2022-09-06 | 广东工业大学 | Polarization-maintaining optical fiber ring distributed polarization crosstalk bidirectional simultaneous measurement device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103743553B (en) | The dual channel optical performance testing device of a kind of integrated waveguide manipulator and polarization crosstalk identification thereof and processing method | |
| CN102928199B (en) | Device and method for improving polarization crosstalk measurement performance of optical device | |
| CN102279095B (en) | Device for reducing influence of birefringent chromatic dispersion on polarization coupling measurement of polarization maintaining optical fiber | |
| CN104280216A (en) | Dual-channel optical performance simultaneous testing device for Y waveguide device and Y waveguide polarization crosstalk recognizing and processing method thereof | |
| CN102288388B (en) | Device and method for improving polarization-maintaining optical fiber polarization coupling measurement precision and symmetry | |
| CN103900798B (en) | A kind of optical coherence domain polarization measurement device scanning on-line correction with light path | |
| CN103743551A (en) | Method for measuring optical performance of multi-functional lithium niobate integrator | |
| CN106768877B (en) | A kind of Larger Dynamic range scaling method for optical coherence domain polarimeter | |
| CN105841928B (en) | A kind of High Extinction Ratio measurement method of optical fiber polarizer | |
| CN104792503A (en) | Device for enhancing sensitivity of distributed crosstalk measurement of optical polarizing device | |
| CN106441353B (en) | A kind of symmetry assessment device of optical fibre gyro ring polarization coupled | |
| CN105043718A (en) | Noise suppression device and noise suppression method for distributed polarization crosstalk measurement of optical polarizer | |
| CN104280217B (en) | A kind of Y waveguide dual channel optical device for measuring properties | |
| CN103900680A (en) | Device and detecting method for restraining polarization crosstalk measuring noise by the adoption of light source | |
| CN103900799A (en) | Optical coherence polarization measuring device capable of restraining interferential noises | |
| CN101639387B (en) | Optical fiber temperature sensor for detection based on wavelength corresponding to extreme value and temperature sensing method | |
| CN108106817B (en) | Method for improving polarization performance measurement accuracy of Y waveguide device | |
| CN106989904A (en) | A kind of measuring method of polarization maintaining optical fibre extinction ratio | |
| CN112082735B (en) | Optical fiber sensing ring bidirectional synchronous measurement device and method based on Sagnac structure | |
| CN109946042B (en) | Method and device for measuring coupling precision of Y-shaped waveguide | |
| Yu et al. | Distributed measurement of polarization characteristics for a multifunctional integrated optical chip: A review | |
| CN104280215B (en) | Dual-channel optical performance bi-directional multi-alignment-angle automatic testing device for Y waveguide | |
| CN204405294U (en) | A kind of dual channel optical performance proving installation simultaneously of Y waveguide device | |
| CN204202850U (en) | A kind of two-way multipair shaft angle degree automatic testing equipment of dual channel optical performance of Y waveguide | |
| CN112082651B (en) | Polarization characteristic measurement method for assembling full polarization-maintaining Sagnac closed light path |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20181011 |