CN103743487A - Optical coherence domain polarization measurement device - Google Patents
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Abstract
The present ivention belongs to the techical field of optical fiber measurement, in particular to an optical coherence domain polarization measurement device of differential symmetric optical path scanning. The present ivention comprises a wide spectrum light source, a polarizer, a polarization device to be measured, a polarization analyzer, an optical path correlator, a differential detection device, a photoelectric signal conversion and a signal recording device which are connected together according to the order. The present invention has advantage of the character that the product of output signal amplitude of optical coherence domain polarization measurement device is in proportion to the transmitted light intensity of scanning optical path delayer, the differential symmetric optical path scanner in the two interference arms of an optical path correlator is realized to automatically compensate the light intensity, greatly suppressing the effect of a single scanner strength floating on the measurement, improving the measurement accuracy of the polarization crosstalk, decreasing the demand of the scanner strength floating performance.
Description
Technical field
The present invention's design belongs to optical fiber measurement technical field, is specifically related to a kind of optical coherence territory polarimeter of the symmetrical light path scanning of difference.
Background technology
Optical coherence territory Polarization Detection (OCDP) based on white light interference principle is the most promising a kind of optical fiber measurement technical scheme.According to white light interference principle, 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 path compensation is carried out by scan-type Michelson interferometer in optical coherence territory polarization technology (OCDP), realizes the interference between different coupled mode, can station-keeping mode Coupling point etc. the position of inside of optical fibre defect, utilize interference strength, analyze this stiffness of coupling.Therefore, OCDP technology 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 obtained 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), the low coherent reflection meter of optics (OLCR), optical frequency domain reflection technology (OFDR), light coherent field reflection technology (OCDR) distributed detection method, compare with technology, OCDP technology has (based on interferometers such as Mach-Zehnder or Michelson) simple in structure, high spatial resolution (several centimetres), wide-measuring range (several kilometers), super high measurement sensitivity (90～-100dB), super big dynamic range (10
9～10
10) etc. advantage.
As far back as the eighties, started research just improving Polarization Detection precision abroad.Early 1990s, people (the Method for the detection of polarization couplings in a birefringent optical system and application of this method to the assembling of the components of an optical system such as France Herve Lefevre, US Patent 4893931) the OCDP system based on white light interference principle is disclosed first, its adopt super-radiance light emitting diode (SLD) as light source and space interference light path as light path measurement of correlation structure.France Photonetics company has developed WIN-P125 and two kinds of model OCDP test macros of WIN-P400 according to this patent, is mainly used in shorter (500m) and grows the polarization characteristic analysis of (1600m) polarization maintaining optical fibre.Its main performance be polarization interference sensitivity for-70dB, dynamic range be 70dB.The ICD800 that Korea S Fiberpro company has released 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, bring up to-80dB of sensitivity.
2011, the people such as Yao Xiaotian of AM General photoelectricity company (General Photonics Corporation) disclose a kind of full optical measuring system (Measuring Distributed Polarization Crosstalk in Polarization Maintaining Fiber and Optical Birefringent Material for polarization maintaining optical fibre and the measurement of optical birefringence material distributed polarization interference, US 20110277552), utilization increased optical path delay device before light path correlator, quantity and the amplitude of spuious white light interference signal while suppressing polarization interference measurement.The method can be by the bring up to-95dB of polarization interference sensitivity of full optical measuring system, but dynamic range remains on 75dB.
The same year, the people such as the Zhang Hongxia of University Of Tianjin disclose a kind of detection method and pick-up unit (Chinese Patent Application No.: CN 201110052231.3) of optical polarization device extinction ratio, the same space interference light path that adopts 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 people's such as Herve Lefevre scheme, and technical feature and index are close.
2012, applicant discloses the full test optical fiber device (Chinese Patent Application No.: CN 201210379406) that a kind of optical device polarization interference is measured, this invention adopts full test optical fiber device, 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.: CN 201210379407) that improves optical device polarization interference measurement performance, this invention can greatly suppress noise amplitude, improves sensitivity and dynamic range that polarization interference is measured.
In the full test optical fiber device (accompanying drawing 2) of measuring at typical optical device polarization interference, the interchange intensity of interference signal is directly proportional to optical device polarization crosstalk value, when light path scanister exists only in wherein Yi road of two optical interference circuits, an i.e. reference arm that light path is constant, a gage beam with light path scanning, there is many defects: (1) light path scanister only has an arm to have single scanning mechanism, light-intensity variation will directly have influence on the measuring accuracy of whole polarization crosstalk measuring system, exist light-intensity variation large, the scanning shortcomings such as light path is short; (2) because optical device (as collimation lens) exists inherent shortcoming, go out light intensity distributions even not, be difficult to reach the perfect condition of expectation, by boost device performance, improving total system index will produce very large difficulty; (3) length of single scanning mechanism measurement optics is narrower, increases scanning distance and is faced with the increase of scanning mechanism yardstick, and then have 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 that suppresses light-intensity variation, increases scanning distance, and then improve optical device polarization crosstalk measuring accuracy, become a difficult point of polarization crosstalk measuring technique lifting.
The invention discloses the symmetrical light path scanning optical of a kind of difference coherent field polarimeter.The symmetrical light path Scan Architecture of difference is comprised of the light path delayed sweep device of two function opposite independent.The transmitted light intensity of delayer has complementary symmetry with the variation of light path scanning distance:, when light path scans, a monotonic intensity increase adds, and another one dullness reduces, and the Strength Changes of the two has reversion symmetry.Adopt the optical coherence territory polarimeter of the symmetrical light path Scan Architecture of difference can greatly suppress the impact that single scanning device intensity is floated on measurement, improved the measuring accuracy of polarization crosstalk, reduced the requirement to scanner strength retrogression performance, making always to scan light path has increased by one times.The present invention can be widely used in measurement, sensing and the acquisition of information field based on white light interference principle.
Summary of the invention
The object of the present invention is to provide the single light path scanner of the inhibition intensity of the symmetrical light path scanning of a kind of difference to float on the impact of measuring, improve the measuring accuracy of polarization crosstalk, increase the optical coherence territory polarimeter of light path sweep limit.
The object of the present invention is achieved like this:
An optical coherence territory polarimeter, wide spectrum light source, the polarizer, polarizer to be measured, analyzer, light path correlator, difference detecting device, photosignal conversion link together according to said sequence with signal recording apparatus,
In light path correlator, with the symmetrical light path Scan Architecture of difference, by the light path delayed sweep device of two function opposite independent, formed, specifically comprise the 1st collimation lens, the 2nd collimation lens, displacement scanister; The removable optical mirror of forward and reverse removable optical mirror are installed on displacement scanister;
The 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; The 1st collimation lens is consistent with the optical device parameter of the 2nd collimation lens, the removable optical mirror of forward and reverse removable optical mirror;
The 1st collimation lens and the 2nd collimation lens are connected to two of light path correlator different interference in arms: when the removable optical mirror of forward is during 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 difference detecting device, finally detects and is connected with treating apparatus with interference signal;
Light path correlator is comprised 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 mirror 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 output terminal of the 1st circulator, the 2nd circulator connects respectively the 1st collimation lens, the 2nd collimation lens; 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 reflection end of the 1st circulator, the 2nd circulator is 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 comprised of Mach-Zehnder interferometer or Michelson interferometer, and interferometer two arms are poor for being chosen as zero point:
1) when the removable optical mirror of forward is in leading zero's position, and reverse removable optical mirror is while having 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 of utilizing optical coherence territory polarimeter signal output amplitude to be directly proportional to the product of light path delayed sweep device transmitted light intensity, make to interfere the symmetrical light path scanister of difference in arm to realize light intensity auto-compensation in light path correlator two, greatly having suppressed single scanning device intensity floats on the impact of measuring, improve the measuring accuracy of polarization crosstalk, reduce the requirement to the unsteady performance of scanner intensity;
(2) adopt the symmetrical light path Scan Architecture of difference, in the situation that adopting same scan gearshift, light path scanning distance is doubled, can be in the situation that not changing existing system overall dimensions, expand the measurement range of system, and then can improve optical coherence territory polarimeter overall performance;
(3) use the whole identical optical device of parameter that comprise collimating apparatus, catoptron etc., and adopt differential scanning structure, can reduce environment to the impact of measuring, improve systematically stability.
Accompanying drawing explanation
Fig. 1 is the full test optical fiber device schematic diagram that a kind of typical optical device polarization interference is measured;
Fig. 2 is the symmetrical light path scanning optical of a kind of difference coherent field polarimeter schematic diagram;
Fig. 3 is that in the symmetrical light path Scan Architecture of single light path Scan Architecture and difference, relevant light intensity changes schematic diagram;
Fig. 4 is a kind of optical coherence territory polarimeter schematic diagram of the symmetrical light path Scan Architecture of difference of transmission-type;
Fig. 5 is a kind of optical coherence territory polarimeter schematic diagram of the symmetrical light path Scan Architecture of difference 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 the symmetrical light path scanning optical of a kind of difference coherent field polarimeter, comprised wide spectrum light source, the polarizer, polarizer to be measured, analyzer, light path correlator, difference detecting device, photosignal conversion and signal recording apparatus.It is characterized in that:
1) in light path correlator 110 with the symmetrical light path Scan Architecture of difference M, by light path delayed sweep device Ma, the Mb of two function opposite independent, formed, specifically comprise the 1st collimation lens the 115, the 2nd collimation lens 116, displacement scanister 117; The removable optical mirror 117a of forward and reverse removable optical mirror 117b are installed on displacement scanister 117;
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; The optical device parameters such as the 1st collimation lens 115 and the 2nd collimation lens 116, the removable optical mirror 117a of forward and reverse removable optical mirror 117b have consistance; 1st, the insertion loss of 2 collimation lenses 115 and 116 pairs is linear change and monotonic decay with distance;
3) the 1st, 2 collimation lenses 115 and 116 are connected in two of the light path correlator 110 different arm 1A of interference and 1B, and the light path scan variations between the two has displacement complementarity: when the removable optical mirror 117a of forward is during 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, the removable optical mirror 117a of forward and reverse removable optical mirror 117b have identical displacement L.
Described a kind of optical coherence territory polarimeter, is characterized in that:
1) 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 difference detecting device 120, finally detects and is connected with treating apparatus 130 with interference signal.
2) light path correlator 110 is comprised of the 1st coupling mechanism the 111, the 2nd coupling mechanism the 112, the 1st circulator the 113, the 2nd circulator the 114, the 1st collimation lens the 115, the 2nd collimation lens 116, forward optical mirror 117a, reverse optical mirror 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, the 1d 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 114b of the output terminal 113b of the 1st circulator 113, the 2nd circulator 114 connects respectively the 1st collimation lens the 115, the 2nd collimation lens 116; The removable optical mirror 117a of forward of the corresponding displacement scanister 117 of the 1st collimation lens 115, the reverse removable optical mirror 117b of the corresponding displacement scanister 117 of the 2nd collimation lens 116; The reflection end 114c of the reflection end 113c of the 1st circulator 113, the 2nd circulator 114 is connected with two input port 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 the sweep limit L of table top can cover whole light path scopes that testing fiber device 104 front/rear ends produce.
The structure of described light path correlator 110, is characterized in that being comprised of Mach-Zehnder interferometer or Michelson interferometer, and interferometer two arms are poor for being chosen as zero point:
1) when the removable optical mirror 117a of forward is in leading zero's position, and reverse removable optical mirror 117b is while having maximum displacement L, and vice versa;
2) when the removable optical mirror 117a of forward and reverse removable optical mirror 117b have half L/2 of maximum displacement simultaneously.
The light that wide spectrum light source 101 sends is through a series of measuring elements, by the input end 1a of the 1st coupling mechanism 111, enters light path difference scanning optical path 110, and light is divided into two-way by the 1st coupling mechanism; Two output terminal 1c, 1d via the 1st coupling mechanism input to light respectively the input end 113a of the 1st circulator and the input end 114a of the 2nd circulator; Due to the optical-unidirectional transfer function that circulator has, the light entering from input end is transferred to GRIN Lens 115 and 116 via output terminal 113b, the 114b of circulator respectively; Two-beam forms light path difference through displacement scanister 117, and GRIN Lens 115 emergent lights are reflected back GRIN Lens 115 by optical mirror 117a, and GRIN Lens 116 emergent lights are reflected back GRIN Lens 116 by optical mirror 117b; Two-beam enters respectively circulator 113,114 again, enters into respectively input end 1e and the 1f of the 2nd coupling mechanism 112 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 is delivered to interference signal detection and analyze with treating apparatus 130.
(1) to suppressing light-intensity variation, be analyzed as follows:
From classical coherence theory, two single light source p stacks on one point, synthetic complex amplitude E (p) is
E(p)＝E
1(p)+E
2(p) （1）
Wherein, E
1and E (p)
2(p) be respectively the amplitude of single light source.
The product that is proportional to the synthetic complex amplitude E (p) of this point and its conjugate complex amplitude E* (p) at the interference light intensity I of a p (p), can be expressed as
By formula (2), can be obtained, synthetic interference signal light-intensity variation and the light-intensity variation of single light source value are closely related.
Mach-Zehnder interferometer 210 in the full optical fiber testing system (accompanying drawing 2) that typical optical device polarization interference is measured contrasts with the Mach-Zehnder interferometer 110 in the optical coherence territory polarimeter (accompanying drawing 1) based on the symmetrical light path Scan Architecture of difference.
The collimation lens of light in light path scanister propagated, and the directional light that can regard as in tail optical fiber converges and sends through collimation lens, and its outgoing light field distribution of amplitudes is one increases the function of dispersing gradually with distance.
For analytic explanation simply qualitatively, suppose that collimation lens 214,115,116 bright dipping end light intensity changes in spatial distribution move as linear change process with displacement platform; Suppose at nearly collimation lens end, light intensity is maximum during x=0, and size is regarded relative amplitude 1 as, collimation distal-most end, and P when light intensity relative amplitude is near-end doubly, is P (0 < P < 1).
Collimation lens 214,115,116 bright dipping end light intensity displacement platforms move and 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 respectively y
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 of difference light path y as shown in Figure 4 b.
Single collimation lens and double-collimation lens light intensity displacement platform are moved and changed such as shown in Fig. 4 c: single collimation lens occurs minimum value P at L place, at 0 place, occurs maximal value 1, and fluctuating is
α
1＝(1-P) （6）
There is minimum value P in double-collimation lens, at L/2 place, occurs maximal value at two ends
maximum fluctuation is
Improving heel largest light intensity fluctuation ratios delta is before
Due to 0 < P < 1, so
Can adopt thus the symmetrical light path light path of difference scan compensation method, can make light-intensity variation at least be reduced to original 1/4.
Light-intensity variation amplitude changes as shown in Fig. 4 d with P value, curve α
2the symmetrical light path Scan Architecture of corresponding difference, curve α
1corresponding single light path Scan Architecture.After contrast, can obviously find out the fluctuation difference of light intensity between the two: curve α
2with P value, reduce slowly to change to 0.25, curve α from 0
1linear rises to 1, curve α
2compared with curve α
1mild a lot.Visible improvement project is applied in the polarization measurement system of optical coherence territory, light-intensity variation is suppressed obviously, and then reach the object that improves the measuring precision.
(2) scanning light path is doubled to be analyzed as follows:
If the displacement range of displacement scanister 117 displacement table tops is L, apart from the distance of collimation lens 115 ends, be x(0≤x≤L), the distance apart from collimation lens 117 ends is L-x.Via the light institute of 110 liang of arms of light path correlator through process respectively:
Via the 1st coupling mechanism 111 output terminal 1c, interfere arm:
S
1*=111—1c—113a—113—113b—115—x—117a—x—115—113b—113—113c—1e—112；
Via the 1st coupling mechanism 111 output terminal 1d, interfere arm:
S
2*=111—1d—114a—114—114b—116—（L-x）—117b—（L-x）—116—114b—114—114c—1f—112。
According to above light path analysis, suppose that the performance parameter of identical optical device is strictly identical, interfere arms to do poorly to obtain optical path difference S* and be 117 liang of displacement scanister
S*=S
1*-S
2*=2x-2(L-x)=4x-2L （9）
Because 0≤x≤L, so have-2L≤S*≤2L, 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 full optical fiber testing system (accompanying drawing 2) of typical optical device polarization interference measurement.If the displacement range of displacement scanister 215 displacement table tops is L, apart from the distance of collimation lens 214 ends, be x(0≤x≤L).Via the light institute of 210 liang of arms of light path scanning optical path through process respectively:
Via the 1st coupling mechanism 211 output terminal 2c, interfere arm:
S
1=211—2c—213a—213—213b—214—x—215a—x—214—213b—213—213c—21e—212；
Via the 1st coupling mechanism 211 output terminal 2d, interfere arm:
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。
According to above light path analysis, suppose that the performance parameter of identical optical device is strictly identical, interfere arms to do poorly to obtain optical path difference S* and be 215 liang of displacement scanister
S=S
1-S
2=2x （10）
Because 0≤x≤L, so there is 0≤S≤2L, the scope of optical path difference S is 2L.
According to formula (9) and formula (10), compare modified optical path difference S* and typical light path difference S, be easy to get
S*=2S （11）
Can adopt thus the symmetrical light path Scan Architecture of difference method, use same scan distance can realize 2 times of light path scannings.Improvement project is applied in the polarization measurement system of optical coherence territory, use same scan apart from time, can make systematic survey device length double.
Application Example 1---the cross polarization measurement mechanism based on reflection light path scanner
Measurement mechanism as shown in Figure 1, select as follows by device parameters:
(1) the centre wavelength 1550nm of wideband light source 101, half spectral width are greater than 45nm, fiber power is greater than 10mW, and extinction ratio is greater than 6dB;
(2) testing fiber device 104 is 200m panda type polarization-preserving fiber;
(3) collimation lens 115 and 116 operation wavelength are 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 between 0～200mm, change, average insertion loss is 3.0dB, loss fluctuation 0.8dB.
Comprehensive above condition:
(1) according to collimation lens 115 and 116 power swing characteristics, when its near-end power definition is 100%, distal power loss is 0.8dB, is the 83%(P=0.83 of near-end power) by formula (7), obtained
From above formula, the symmetrical light path scanister of difference α
2light-intensity variation 0.72%, and single light path scanister α
1light-intensity variation 17%, light intensity is floated and to be reduced to original 1/24.
(2) adopt the symmetrical light path Scan Architecture scanning of difference 200m panda type polarization-preserving fiber, in displacement scanister, scan table identity distance is from becoming traditional 1/2.Use equally the light path scanister of 0～200mm distance, the light path that the optical coherence territory polarimeter (accompanying drawing 1) of employing based on the symmetrical light path Scan Architecture of difference can reach full test optical fiber device (accompanying drawing 2) 0～400mm distance of typical optical device polarization interference measurement scans effect.
Application Example 2---the cross polarization measurement mechanism based on transmission light path scanner
The symmetrical light path scanning optical of a kind of difference 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 again (417) two removable catoptrons of displacement scanister into two removable collimation lenses (414 and 416), respectively the light path delayed sweep device relatively independent with two of collimation lens (the 413 and 414) configurations of coupling mechanism (411) output port; The 1st collimation lens has respectively complementary symmetry to (413 and 415) and the 2nd collimation lens to the delayed sweep line of (414 and 416) formation, 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 can greatly suppress single scanning device intensity floats on the impact of measuring, improved the measuring accuracy of polarization crosstalk, reduced the requirement to scanner strength retrogression performance, making always to scan light path has increased by one times.
Application Example 3---the cross polarization measurement mechanism based on Michelson interferometer
The symmetrical light path scanning optical of a kind of difference coherent field polarimeter as shown in Figure 5.With accompanying drawing 1 difference be that Mach-Zehnder interferometer is transformed into Michelson interferometer.
Simplicity due to Michelson interferometer structure, without unnecessary optical device, can realize difference: two interference arms (5A and 5B) are connected with two collimation lenses (511 and 512) respectively, and GRIN Lens bright dipping is corresponding displacement scanister (513) reflection device (513a and 513b) respectively.Collimation lens (511 and 512) is the light path delayed sweep device relatively independent with two of catoptron (513a and 513b) configurations respectively; The delayed sweep line forming has respectively complementary symmetry, 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---the cross polarization measurement mechanism of the symmetrical light path Scan Architecture of difference based on Michelson interferometer, can greatly suppress single scanning device intensity floats on the impact of measuring, improved the measuring accuracy of polarization crosstalk, reduced the requirement to scanner strength retrogression performance, making always to scan light path has increased by one times.
Claims (4)
1. an optical coherence territory polarimeter, wide spectrum light source (101), the polarizer (102), polarizer to be measured (104), analyzer (106), light path correlator (110), difference detecting device (120), photosignal conversion link together according to said sequence with signal recording apparatus (130), it is characterized in that:
In light path correlator (110) with the symmetrical light path Scan Architecture (M) of difference, light path delayed sweep device (Ma, Mb) by two function opposite independent forms, and specifically comprises the 1st collimation lens (115), the 2nd collimation lens (116), displacement scanister (117); The removable optical mirror of forward (117a) and reverse removable optical mirror (117b) are installed on displacement scanister (117);
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; The 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);
The 1st collimation lens (115) and the 2nd collimation lens (116) are connected to two of light path correlator (110) different interference in arms: when the removable optical mirror of forward (117a) is during 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 according to claim 1 territory polarimeter, 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 difference detecting device (120), finally detects and is connected with treating apparatus (130) with interference signal;
Light path correlator (110) is comprised 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 mirror (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 (114b) of the output terminal (113b) of the 1st circulator (113), the 2nd circulator (114) connects respectively the 1st collimation lens (115), the 2nd collimation lens (116); The removable optical mirror of forward (117a) of the 1st corresponding displacement scanister of collimation lens (115) (117), the reverse removable optical mirror (117b) of the 2nd corresponding displacement scanister of collimation lens (116) (117); The reflection end (114c) of the reflection end (113c) of the 1st circulator (113), the 2nd circulator (114) is 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 according to claim 1 territory polarimeter, it is characterized in that: described displacement scanister (117), the sweep limit of table top (L) can cover whole light path scopes that testing fiber device (104) front/rear end produces.
4. a kind of optical coherence according to claim 1 territory polarimeter, it is characterized in that: the structure of described light path correlator (110), can be comprised of Mach-Zehnder interferometer or Michelson interferometer, interferometer two arms are poor for being chosen as zero point:
1) when the removable optical mirror of forward (117a) is in leading zero's position, and reverse removable optical mirror (117b) is while having 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310739314.9A CN103743487B (en) | 2013-12-30 | 2013-12-30 | A kind of optical coherence domain polarization measurement device |
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| CN104792503A (en) * | 2015-05-05 | 2015-07-22 | 哈尔滨工程大学 | Device for enhancing sensitivity of distributed crosstalk measurement of optical polarizing device |
| CN105823620A (en) * | 2016-03-17 | 2016-08-03 | 哈尔滨工程大学 | Method of identifying pseudo interference peaks in polarization maintaining fiber defect point measurement |
| CN105953919A (en) * | 2016-04-01 | 2016-09-21 | 哈尔滨工程大学 | All-fiber Fourier expansion 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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| CN104792503A (en) * | 2015-05-05 | 2015-07-22 | 哈尔滨工程大学 | Device for enhancing sensitivity of distributed crosstalk measurement of optical polarizing device |
| CN105823620A (en) * | 2016-03-17 | 2016-08-03 | 哈尔滨工程大学 | Method of identifying pseudo interference peaks in polarization maintaining fiber defect point measurement |
| CN105953919A (en) * | 2016-04-01 | 2016-09-21 | 哈尔滨工程大学 | All-fiber Fourier expansion spectrum analyzer |
| 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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