CN103743487B - A kind of optical coherence domain polarization measurement device - Google Patents
A kind of optical coherence domain polarization measurement device Download PDFInfo
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- CN103743487B CN103743487B CN201310739314.9A CN201310739314A CN103743487B CN 103743487 B CN103743487 B CN 103743487B CN 201310739314 A CN201310739314 A CN 201310739314A CN 103743487 B CN103743487 B CN 103743487B
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Abstract
The present invention's design belongs to technical field of optical fiber measurement, is specifically related to a kind of optical coherence domain polarization measurement device of differential symmetry light path scanning.Wide spectrum light source of the present invention, the polarizer, polarizer to be measured, analyzer, light path correlator, difference detecting device, photoelectric signal transformation and signal recording apparatus link together according to said sequence.The feature that the present invention utilizes optical coherence domain polarization measurement device signal output amplitude to be directly proportional to the product of light path delayed sweep device transmitted light intensity, making to be in light path correlator two interferes the differential symmetry light path scanister in arm to realize light intensity auto-compensation, single scanning device intensity is greatly inhibit to float on the impact of measuring, improve the measuring accuracy of polarization crosstalk, reduce the requirement of performance that scanner intensity floated.
Description
Technical field
The present invention's design belongs to technical field of optical fiber measurement, is specifically related to a kind of optical coherence domain polarization measurement device of differential symmetry light path scanning.
Background technology
Optical coherence domain Polarization Detection (OCDP) based on white light interference theory is the most promising optical fiber measurement technical scheme of one.According to white light interference theory, adopt the structure of full polarization fibre, utilize optical fibre device can coil the characteristic stable with device performance, it is little that whole experimental provision has volume, the feature that stability is high.Optical coherence domain polarization technology (OCDP) carries out optical path compensation by scan-type Michelson interferometer, realize the interference between different coupled mode, can the position of the inside of optical fibre defect such as station-keeping mode Coupling point, utilize interference strength, analyze this stiffness of coupling.Therefore, OCDP technology at polarization extinction ratio test, optical fibre gyro ring test, polarization maintaining optical fibre accurately, polarization maintaining optical fibre manufacture, polarization maintaining optical fibre accurately all obtain successful application to fields such as axle, the tests of device extinction ratio.With other similar techniques, such as optical time domain reflectometer (OTDR), polarization time domain reflection technology (POTDR), optical low-coherent reflectometry (OLCR), optical frequency domain reflection technology (OFDR), light coherent field reflection technology (OCDR) distributed detection method are compared with technology, and OCDP technology has structure simple (based on interferometers such as Mach-Zehnder or Michelson), high spatial resolution (several centimetres), wide-measuring range (several kilometers), superelevation measurement sensistivity (-90 ~-100dB), super big dynamic range (10
9~ 10
10) etc. advantage.
As far back as the eighties, starting research with regard to improving Polarization Detection precision abroad.Early 1990s, people (the Methodforthedetectionofpolarizationcouplingsinabirefring entopticalsystemandapplicationofthismethodtotheassemblin gofthecomponentsofanopticalsystem such as France HerveLefevre, USPatent4893931) make public for the first time the OCDP system based on white light interference theory, its adopts super-radiance light emitting diode (SLD) as light source and space interference light path as light path measurement of correlation structure.Photonetics company of France have developed WIN-P125 and WIN-P400 two profiles OCDP test macro according to this patent, is mainly used in the polarization characteristic analysis of shorter (500m) and longer (1600m) polarization maintaining optical fibre.Its main performance is polarization interference sensitivity is-70dB, dynamic range is 70dB.The ICD800 that Fiberpro company of Korea S is proposed is mainly used in replacing WIN-P series OCDP system, and spatial resolution is 10cm, and scanning polarization maintaining optical fibre length is increased to 1000m, and-80dB is brought up in sensitivity.
2011, the people such as the Yao Xiaotian of AM General photoelectricity company (GeneralPhotonicsCorporation) disclose a kind of all-fiber measuring system (MeasuringDistributedPolarizationCrosstalkinPolarizationM aintainingFiberandOpticalBirefringentMaterial measured for distributed polarization interference in polarization maintaining optical fibre and optical birefringence material, US20110277552), utilize and increased optical path delay device before light path correlator, suppress quantity and the amplitude of spuious white light interference signal during polarization interference measurement.The polarization interference sensitivity of all-fiber measuring system can be brought up to-95dB by the method, but dynamic range remains on 75dB.
The same year, the people such as University Of Tianjin Zhang Hongxia disclose a kind of detection method and pick-up unit (Chinese Patent Application No.: CN201110052231.3) of optical polarization device extinction ratio, 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.It is compared with the scheme of the people such as HerveLefevre, and technical feature is close with index.
2012, applicant discloses all-fiber proving installation (Chinese Patent Application No.: CN201210379406) that a kind of optical device polarization interference is measured, this invention adopts all-fiber proving installation, there is high, the better temperature of measuring accuracy and stability of vibration, can be used for high-acruracy survey and the analysis of optical device polarization property.The same year, applicant discloses a kind of device and method (Chinese Patent Application No.: CN201210379407) improving optical device polarization interference measurement performance, this invention can greatly restraint speckle amplitude, improves sensitivity and dynamic range that polarization interference measures.
In all-fiber proving installation (accompanying drawing 2) that typical optical device polarization interference is measured, the exchanging degree of interference signal is directly proportional to optical device polarization crosstalk value, when light path scanister exists only in two optical interference circuits road wherein, namely the reference arm that a light path is constant, a gage beam with light path scanning, there is many defects: (1) light path scanister only has an arm to there is single scanning mechanism, light-intensity variation will directly have influence on the measuring accuracy of whole polarization crosstalk measuring system, there is light-intensity variation large, the shortcomings such as scanning light path is short; (2) because optical device (as collimation lens) exists inherent shortcoming, go out light intensity distributions even not, be difficult to the perfect condition reaching expectation, improving total system index by boost device performance will produce very large difficulty; (3) length of single scanning mechanism measurement optics is narrower, increases the increase that scanning distance is faced with scanning mechanism yardstick, and then has influence on the system dimension of polarization interference measurement mechanism.How to pass through to change light channel structure, utilize identical light path scanister, reach the object suppressing light-intensity variation, increase scanning distance, and then improve optical device polarization crosstalk measuring accuracy, become a difficult point of polarization crosstalk measuring technique lifting.
The invention discloses a kind of differential symmetry light path scanning optical coherent field polarimeter.Differential symmetry light path Scan Architecture is made up of the light path delayed sweep device of two function opposite independent.The transmitted light intensity of delayer has complementary symmetry with the change of light path scanning distance: namely when light path scans, and a monotonic intensity increases, and another one dullness reduces, and the Strength Changes of the two has inversion symmetry.The optical coherence domain polarization measurement device of differential symmetry light path Scan Architecture is adopted can greatly to suppress single scanning device intensity to float on the impact of measuring, improve the measuring accuracy of polarization crosstalk, reduce the requirement to scanner strength retrogression performance, make always to scan light path and add one times.The present invention can be widely used in based on the measurement of white light interference theory, sensing and acquisition of information field.
Summary of the invention
The suppression single light path scanner intensity that the object of the present invention is to provide a kind of differential symmetry light path to scan is floated on the impact of measuring, and improves the measuring accuracy of polarization crosstalk, increases the optical coherence domain polarization measurement device of light path sweep limit.
The object of the present invention is achieved like this:
A kind of optical coherence domain polarization measurement device, wide spectrum light source, the polarizer, polarizer to be measured, analyzer, light path correlator, difference detecting device, photoelectric signal transformation and signal recording apparatus link together according to said sequence,
With differential symmetry light path Scan Architecture in light path correlator, be made up of the light path delayed sweep device of two function opposite independent, specifically comprise the 1st collimation lens, the 2nd collimation lens, displacement scanister; Displacement scanister is provided with the removable optical mirror of forward and reverse removable optical mirror;
1st collimation lens and removable optical mirror, the 2nd collimation lens and removable optical mirror form the light path delayed sweep device of two function opposite independent; 1st collimation lens and the 2nd collimation lens, the removable optical mirror of forward are consistent with the optical device parameter of reverse removable optical mirror;
1st collimation lens and the 2nd collimation lens are connected in two different interference arms of light path correlator: when the removable optical mirror of forward is in leading zero's position, reverse removable optical mirror has maximum displacement; When the removable optical mirror of forward moves to maximum displacement, reverse removable optical mirror is in null position; In scanning process, the removable optical mirror of forward and reverse removable optical mirror have identical displacement.
The light that wide spectrum light source sends is successively by the polarizer, the 1st rotary connector, testing fiber device, the 2nd rotary connector, analyzer, be connected with light path correlator, light path correlator connects polarization differential sniffer, is finally connected with interference signal detection and treatment device;
Light path correlator is made up of the 1st coupling mechanism, the 2nd coupling mechanism, the 1st circulator, the 2nd circulator, the 1st collimation lens, the 2nd collimation lens, forward optical mirror, reverse optical catoptron and displacement scanister.Front end wide spectrum light source is connected with the 1st coupling mechanism by input port via each device; The output port of the 1st coupling mechanism is connected with the input end of the 1st circulator, the input end of the 2nd circulator respectively; The output terminal of the 1st circulator, the output terminal of the 2nd circulator connect the 1st collimation lens, the 2nd collimation lens respectively; The removable optical mirror of forward of the corresponding displacement scanister of the 1st collimation lens, the reverse removable optical mirror of the corresponding displacement scanister of the 2nd collimation lens; The reflection end of the 1st circulator, the reflection end of the 2nd circulator are connected with two input ports of the 2nd coupling mechanism respectively; Two output terminals of the 2nd coupling mechanism are finally connected with difference detecting device.
Displacement scanister, the sweep limit of table top can cover whole light path scopes that testing fiber device front/rear end produces.
The structure of light path correlator, can be made up of Mach-Zehnder interferometer or Michelson interferometer, and interferometer two-arm difference is for being chosen as zero point:
1) when the removable optical mirror of forward is in leading zero's position, and when reverse removable optical mirror has maximum displacement;
2) when the removable optical mirror of forward and reverse removable optical mirror have maximum displacement one half simultaneously.
Beneficial effect of the present invention is:
(1) feature that optical coherence domain polarization measurement device signal output amplitude is directly proportional to the product of light path delayed sweep device transmitted light intensity is utilized, making to be in light path correlator two interferes the differential symmetry light path scanister in arm to realize light intensity auto-compensation, single scanning device intensity is greatly inhibit to float on the impact of measuring, improve the measuring accuracy of polarization crosstalk, reduce the requirement of performance that scanner intensity floated;
(2) differential symmetry light path Scan Architecture is adopted, when adopting same scan gearshift, light path scanning distance is doubled, can when not changing existing system overall dimensions, extend the measurement range of system, and then optical coherence domain polarization measurement device overall performance can be improved;
(3) use and comprise all identical optical device such as the parameter of collimating apparatus, catoptron etc., and adopt differential scanning structure, environment can be reduced on the impact of measuring, improve systematically stability.
Accompanying drawing explanation
Fig. 1 is all-fiber proving installation schematic diagram that a kind of typical optical device polarization interference is measured;
Fig. 2 is a kind of differential symmetry light path scanning optical coherent field polarimeter schematic diagram;
Fig. 3 is light intensity change schematic diagram relevant in single light path Scan Architecture and differential symmetry light path Scan Architecture;
Fig. 4 is a kind of optical coherence domain polarization measurement device schematic diagram of differential symmetry light path Scan Architecture of transmission-type;
Fig. 5 is a kind of optical coherence domain polarization measurement device schematic diagram of differential symmetry light path Scan Architecture of Michelson type.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
Disclose a kind of differential symmetry light path scanning optical coherent field polarimeter, comprise wide spectrum light source, the polarizer, polarizer to be measured, analyzer, light path correlator, difference detecting device, photoelectric signal transformation and signal recording apparatus.It is characterized in that:
1) in light path correlator 110 with differential symmetry light path Scan Architecture M, be made up of light path delayed sweep device Ma, Mb of two function opposite independent, specifically comprise the 1st collimation lens 115, the 2nd collimation lens 116, displacement scanister 117; Displacement scanister 117 is provided with forward removable optical mirror 117a and reverse removable optical mirror 117b;
2) the 1st collimation lens 115 and removable optical mirror 117a, the 2nd collimation lens 116 and removable optical mirror 117b form the light path delayed sweep device of two function opposite independent; 1st collimation lens 115 and the optical device parameter such as the 2nd collimation lens 116, forward removable optical mirror 117a and reverse removable optical mirror 117b have consistance; 1st, the insertion loss that 2 collimation lenses 115 and 116 are right linearly changes and monotonic decay with distance;
3) the 1st, 2 collimation lenses 115 and 116 are connected in two different interference arm 1A and 1B of light path correlator 110, and light path scan variations therebetween has displacement complementarity: when the removable optical mirror 117a of forward is in leading zero's position, reverse removable optical mirror 117b has maximum displacement L; When the removable optical mirror 117a of forward moves to maximum displacement L, reverse removable optical mirror 117b is in null position; In scanning process, forward removable optical mirror 117a and reverse removable optical mirror 117b has identical displacement L.
Described a kind of optical coherence domain polarization measurement device, is characterized in that:
1) light that sends of wide spectrum light source 101 is successively by the polarizer 102, the 1st rotary connector 103, testing fiber device 104, the 2nd rotary connector 105, analyzer 106, be connected with light path correlator 110, light path correlator 110 connects polarization differential sniffer 120, is finally connected with interference signal detection and treatment device 130.
2) light path correlator 110 is made up of the 1st coupling mechanism 111, the 2nd coupling mechanism 112, the 1st circulator 113, the 2nd circulator 114, the 1st collimation lens 115, the 2nd collimation lens 116, forward optical mirror 117a, reverse optical catoptron 117b and displacement scanister 117.Front end wide spectrum light source 101 is connected with the 1st coupling mechanism 111 by input port 1a via each device; Output port 1c, 1d of 1st coupling mechanism 111 are connected with the input end 113a of the 1st circulator 113, the input end 114a of the 2nd circulator 114 respectively; The output terminal 113b of the 1st circulator 113, the output terminal 114b of the 2nd circulator 114 connect the 1st collimation lens 115, the 2nd collimation lens 116 respectively; The removable optical mirror 117a of forward of the 1st collimation lens 115 corresponding displacement scanister 117, the reverse removable optical mirror 117b of the 2nd collimation lens 116 corresponding displacement scanister 117; The reflection end 113c of the 1st circulator 113, the reflection end 114c of the 2nd circulator 114 are connected with two input ports 1e, 1f of the 2nd coupling mechanism 112 respectively; Two output terminals of the 2nd coupling mechanism 112 are finally connected with difference detecting device 120.
Described displacement scanister 117, is characterized in that whole light path scopes that the sweep limit L of table top can cover testing fiber device 104 front/rear end and produces.
The structure of described light path correlator 110, is characterized in that to be made up of Mach-Zehnder interferometer or Michelson interferometer, and interferometer two-arm difference is for being chosen as zero point:
1) when the removable optical mirror 117a of forward is in leading zero's position, and when reverse removable optical mirror 117b has maximum displacement L, vice versa;
2) when forward removable optical mirror 117a and reverse removable optical mirror 117b has maximum displacement half L/2 simultaneously.
The light that wide spectrum light source 101 sends, through a series of measuring element, enters light path difference scanning optical path 110 by the input end 1a of the 1st coupling mechanism 111, and light is divided into two-way by the 1st coupling mechanism; Light is inputed to the input end 113a of the 1st circulator and the input end 114a of the 2nd circulator by two output terminals 1c, 1d via the 1st coupling mechanism respectively; Due to the optical-unidirectional transfer function that circulator has, the light entered from input end is transferred to GRIN Lens 115 and 116 via output terminal 113b, 114b of circulator respectively; Two-beam forms light path difference through displacement scanister 117, and GRIN Lens 115 emergent light is reflected back GRIN Lens 115 by optical mirror 117a, and GRIN Lens 116 emergent light is reflected back GRIN Lens 116 by optical mirror 117b; Two-beam enters circulator 113,114 again respectively, enters into input end 1e and 1f of the 2nd coupling mechanism 112 respectively via output terminal 113c, 114c; Two output terminals of the 2nd coupling mechanism 112 are finally connected with difference detecting device 120, interference signal difference are delivered to interference signal detection and treatment device 130 and analyze.
(1) suppression light-intensity variation is analyzed as follows:
From classical coherence theory, two single light source p superpositions on one point, synthesis complex amplitude E (p) is
E(p)＝E
1(p)+E
2(p)（1）
Wherein, E
1(p) and E
2p () is the amplitude of single light source respectively.
Be proportional to this some synthesis complex amplitude E (p) and the product of its conjugate complex amplitude E* (p) at interference light intensity I (p) of a p, can be expressed as
Can be obtained by formula (2), the interference signal light-intensity variation of synthesis and the light-intensity variation of single light source are worth closely related.
Mach-Zehnder interferometer 210 in all-fiber test macro (accompanying drawing 2) that typical optical device polarization interference is measured with contrast based on the Mach-Zehnder interferometer 110 in the optical coherence domain polarization measurement device (accompanying drawing 1) of differential symmetry light path Scan Architecture.
The collimation lens of light in light path scanister is propagated, and the directional light can regarded as in tail optical fiber converges through collimation lens and sends, and its outgoing light field distribution of amplitudes is one increases the function dispersed gradually with distance.
In order to simple analytic explanation qualitatively, suppose that collimation lens 214,115,116 bright dipping end light intensity changes in spatial distribution moves as linear course with displacement platform; Suppose that namely during x=0, light intensity is maximum at nearly collimation lens end, size regards relative amplitude 1 as, and collimation distalmost end, P when namely light intensity relative amplitude is near-end doubly, is P (0 < P < 1).
Collimation lens 214,115,116 bright dipping end light intensity displacement platform moves change as shown in fig. 4 a.
If single collimation lens light intensity y1, has
y
1＝-kx+1（3）
Wherein
The double-collimation lens light intensity of difference light path is y respectively
1and y
2, have
y
1＝-kx+1（4）
y
2＝kx+P
If total light intensity is y after difference, have
y＝y
1y
2＝-k
2x+(1-P)kx+P（5）
According to formula (4) and formula (5), the building-up process of the double-collimation lens light intensity y of difference light path as shown in Figure 4 b.
Single collimation lens and double-collimation lens light intensity displacement platform are moved change contrast as illustrated in fig. 4 c: single collimation lens occurs minimum value P at L place, occurs maximal value 1 at 0 place, and fluctuating is
α
1＝(1-P)（6）
There is minimum value P at two ends in double-collimation lens, occurs maximal value at L/2 place
maximum fluctuation is
The largest light intensity fluctuation ratios delta improved before heel is
Due to 0 < P < 1, so
Differential symmetry light path light path scan compensation method can be adopted thus, light-intensity variation can be made at least to be reduced to original 1/4.
Light-intensity variation amplitude changes as shown in figure 4d with P value, curve α
2corresponding differential symmetry light path Scan Architecture, curve α
1corresponding single light path Scan Architecture.The fluctuation difference of light intensity therebetween obviously can be found out: curve α after contrast
2reduce slowly to change to 0.25 from 0, curve α with P value
1linear rises to 1, curve α
2comparatively curve α
1mild a lot.Improvement project to be applied in optical coherence domain polarization measurement system as seen, light-intensity variation is suppressed obviously, and then reach the object improving the measuring precision.
(2) double to be analyzed as follows to scanning light path:
If the displacement range of displacement scanister 117 displacement table top is L, the distance of distance collimation lens 115 end is x(0≤x≤L), then the distance of distance collimation lens 117 end is L-x.Via light path correlator 110 two-arm light institute through process respectively:
Arm is interfered via the 1st coupling mechanism 111 output terminal 1c:
S
1*=111—1c—113a—113—113b—115—x—117a—x—115—113b—113—113c—1e—112；
Arm is interfered via the 1st coupling mechanism 111 output terminal 1d:
S
2*=111—1d—114a—114—114b—116—（L-x）—117b—（L-x）—116—114b—114—114c—1f—112。
Analyze according to above light path, suppose that the performance parameter of identical optical device is strictly identical, displacement scanister 117 liang interference arm work difference is obtained optical path difference S* is
S*=S
1*-S
2*=2x-2(L-x)=4x-2L（9）
Because 0≤x≤L, so there is-2L≤S*≤2L, namely the scope of optical path difference S* is 4L.
In like manner analyze the optical path difference of the middle Mach-Zehnder interferometer 210 of all-fiber test macro (accompanying drawing 2) that typical optical device polarization interference is measured.If the displacement range of displacement scanister 215 displacement table top is L, the distance of distance collimation lens 214 end is x(0≤x≤L).Via light path scanning optical path 210 two-arm light institute through process respectively:
Arm is interfered via the 1st coupling mechanism 211 output terminal 2c:
S
1=211—2c—213a—213—213b—214—x—215a—x—214—213b—213—213c—21e—212；
Arm is interfered via the 1st coupling mechanism 211 output terminal 2d:
S
2=211—2d—213—2f—212。
Wherein, the formation of matched fiber 213 is:
213=213a—213—213b—214—215a—214—213b—213—213c。
Analyze according to above light path, suppose that the performance parameter of identical optical device is strictly identical, displacement scanister 215 liang interference arm work difference is obtained optical path difference S* is
S=S
1-S
2=2x（10）
Because 0≤x≤L, so there is 0≤S≤2L, namely the scope of optical path difference S is 2L.
Compare modified optical path difference S* and typical light path difference S according to formula (9) and formula (10), be easy to get
S*=2S（11）
Differential symmetry light path Scan Architecture method can be adopted thus, use same scan distance can realize 2 times of light path scannings.Improvement project being applied in optical coherence domain polarization measurement system, when using same scan distance, systematic survey device length can being made to double.
Application Example 1---based on the cross polarization measurement mechanism of reflection light path scanner
Measurement mechanism as shown in Figure 1, select as follows by device parameters:
(1) wideband light source 101 centre wavelength 1550nm, half spectral width is greater than 45nm, fiber power is greater than 10mW, extinction ratio is greater than 6dB;
(2) testing fiber device 104 is 200m panda type polarization-preserving fiber;
(3) operation wavelength of collimation lens 115 and 116 is 1550nm;
(4) diameter of removable optical mirror 117a and 117b is 20mm, and average reflectance is greater than 95%;
Between collimation lens and removable optical mirror (5) (115 and 117a, 116 and 117b) light path scanning distance change between 0 ~ 200mm, average insertion loss is 3.0dB, loss fluctuation 0.8dB.
Comprehensive above condition:
(1) according to collimation lens 115 and 116 power swing characteristic, when being 100% by its near-end power definition, distal power loss is 0.8dB, is the 83%(P=0.83 of near-end power) obtained by formula (7)
From above formula, differential symmetry light path scanister α
2light-intensity variation 0.72%, and single light path scanister α
1light-intensity variation 17%, light intensity is floated and is reduced to original 1/24.
(2) adopt differential symmetry light path Scan Architecture scanning 200m panda type polarization-preserving fiber, in displacement scanister, scan table identity distance is from becoming traditional 1/2.The i.e. same light path scanister using 0 ~ 200mm distance, adopts the optical coherence domain polarization measurement device (accompanying drawing 1) based on differential symmetry light path Scan Architecture can reach the light path scanning effect of all-fiber proving installation (accompanying drawing 2) 0 ~ 400mm distance that typical optical device polarization interference is measured.
Application Example 2---based on the cross polarization measurement mechanism of transmission light path scanner
A kind of differential symmetry light path scanning optical coherent field polarimeter as shown in Figure 4.That the reflection-type of symmetrical light path Scan Architecture (M4) is transformed into transmission-type with accompanying drawing 1 difference.
Change displacement scanister (417) two movable mirror into two removable collimation lenses (414 and 416) again, light path delayed sweep device relatively independent with collimation lens (the 413 and 414) configuration two of coupling mechanism (411) output port respectively; 1st collimation lens has complementary symmetry to (413 and 415) and the 2nd collimation lens respectively to the delayed sweep line that (414 and 416) are formed, and the Strength Changes of the two has symmetrical reversibility; Two collimation lens (413 and 415,414 and 416), to light intensity linear change, have monotonic decay behaviour.
Adopt this Application Example---the cross polarization measurement mechanism of transmission light path scanner, also single scanning device intensity can be greatly suppressed to float on the impact of measuring, improve the measuring accuracy of polarization crosstalk, reduce the requirement to scanner strength retrogression performance, make always to scan light path and add one times.
Application Example 3---based on the cross polarization measurement mechanism of Michelson interferometer
A kind of differential symmetry light path scanning optical coherent field polarimeter as shown in Figure 5.That Mach-Zehnder interferometer is transformed into Michelson interferometer with accompanying drawing 1 difference.
Due to the simplicity of Michelson interferometer structure, difference can be realized: interfere arm (5A with 5B) to be connected with two collimation lenses (511 and 512) respectively by two, GRIN Lens bright dipping is corresponding displacement scanister (513) reflection device (513a and 513b) respectively without the need to unnecessary optical device.The light path delayed sweep device that collimation lens (511 and 512) is relatively independent with catoptron (513a and 513b) configuration two respectively; The delayed sweep line formed has complementary symmetry respectively, and the Strength Changes of the two has symmetrical reversibility; Collimation lens (511 and 512), to light intensity linear change, has monotonic decay behaviour.
Equally, adopt this Application Example---based on the cross polarization measurement mechanism of the differential symmetry light path Scan Architecture of Michelson interferometer, single scanning device intensity can be greatly suppressed to float on the impact of measuring, improve the measuring accuracy of polarization crosstalk, reduce the requirement to scanner strength retrogression performance, make always to scan light path and add one times.
Claims (4)
1. an optical coherence domain polarization measurement device, wide spectrum light source (101), the polarizer (102), testing fiber device (104), analyzer (106), light path correlator (110), difference detecting device (120), photoelectric signal transformation and signal recording apparatus (130) link together according to said sequence, it is characterized in that:
With differential symmetry light path Scan Architecture (M) in light path correlator (110), be made up of the light path delayed sweep device (Ma, Mb) of two function opposite independent, specifically comprise the 1st collimation lens (115), the 2nd collimation lens (116), displacement scanister (117); Displacement scanister (117) is provided with the removable optical mirror of forward (117a) and reverse removable optical mirror (117b);
1st collimation lens (115) and the removable optical mirror of forward (117a), the 2nd collimation lens (116) and reverse removable optical mirror (117b) form the light path delayed sweep device of two function opposite independent; 1st collimation lens (115) and the 2nd collimation lens (116), the removable optical mirror of forward (117a) are consistent with the optical device parameter of reverse removable optical mirror (117b);
1st collimation lens (115) and the 2nd collimation lens (116) are connected in two different interference arms of light path correlator (110): when the removable optical mirror of forward (117a) is in leading zero's position, reverse removable optical mirror (117b) has maximum displacement (L); When the removable optical mirror of forward (117a) moves to maximum displacement (L), reverse removable optical mirror (117b) is in null position; In scanning process, the removable optical mirror of forward (117a) and reverse removable optical mirror (117b) have identical displacement (L).
2. a kind of optical coherence domain polarization measurement device according to claim 1, is characterized in that:
The light that wide spectrum light source (101) sends is successively by the polarizer (102), the 1st rotary connector (103), testing fiber device (104), the 2nd rotary connector (105), analyzer (106), be connected with light path correlator (110), light path correlator (110) connects polarization differential sniffer (120), is finally connected with interference signal detection and treatment device (130);
Light path correlator (110) is made up of the 1st coupling mechanism (111), the 2nd coupling mechanism (112), the 1st circulator (113), the 2nd circulator (114), the 1st collimation lens (115), the 2nd collimation lens (116), forward optical mirror (117a), reverse optical catoptron (117b) and displacement scanister (117); Front end wide spectrum light source (101) is connected with the 1st coupling mechanism (111) by input port (1a) via each device; The output port of the 1st coupling mechanism (111) is connected with the input end (113a) of the 1st circulator (113), the input end (114a) of the 2nd circulator (114) respectively; The output terminal (113b) of the 1st circulator (113), the output terminal (114b) of the 2nd circulator (114) connect the 1st collimation lens (115), the 2nd collimation lens (116) respectively; The removable optical mirror of forward (117a) of the 1st collimation lens (115) corresponding displacement scanister (117), the reverse removable optical mirror (117b) of the 2nd collimation lens (116) corresponding displacement scanister (117); The reflection end (113c) of the 1st circulator (113), the reflection end (114c) of the 2nd circulator (114) are connected with two input ports (1e, 1f) of the 2nd coupling mechanism (112) respectively; Two output terminals of the 2nd coupling mechanism (112) are finally connected with difference detecting device (120).
3. a kind of optical coherence domain polarization measurement device according to claim 1, it is characterized in that: described displacement scanister (117), the sweep limit (L) of table top can cover whole light path scopes that testing fiber device (104) front/rear end produces.
4. a kind of optical coherence domain polarization measurement device according to claim 1, it is characterized in that: the structure of described light path correlator (110), can be made up of Mach-Zehnder interferometer or Michelson interferometer, interferometer two-arm difference is for being chosen as zero point:
1) when the removable optical mirror of forward (117a) is in leading zero's position, and when reverse removable optical mirror (117b) has maximum displacement (L);
2) when the removable optical mirror of forward (117a) and reverse removable optical mirror (117b) have maximum displacement half (L/2) simultaneously.
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| CN105823620B (en) * | 2016-03-17 | 2018-04-17 | 哈尔滨工程大学 | A kind of pseudo- interference peaks discrimination method in the measurement to polarization maintaining optical fibre defect point |
| CN105953919B (en) * | 2016-04-01 | 2018-03-13 | 哈尔滨工程大学 | A kind of all -fiber Fourier spectrum analyzer |
| CN111238772A (en) * | 2019-12-31 | 2020-06-05 | 中国航空工业集团公司西安飞机设计研究所 | Optical fiber ring detection device and detection method based on polarization crosstalk principle |
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