CN103900680A - Device and detecting method for restraining polarization crosstalk measuring noise by the adoption of light source - Google Patents
Device and detecting method for restraining polarization crosstalk measuring noise by the adoption of light source Download PDFInfo
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Abstract
The invention provides a device and detecting method for restraining polarization crosstalk measuring noise by the adoption of a light source. The device is composed of a broadband light source, a polarization device to be detected, an optical path correlator, a difference detecting device, an optical signal converting device and a signal recording device. The device is characterized in that the broadband light source is a low coherent light source with high degree of polarization, and a polarization device provided with high extinction ratio is arranged behind the light source. The detecting method comprises the steps that a polarization state controller is connected between the light source and the polarization device, and the polarizing angle of line polarization light and the polarization device are overlapped with each other seriously through adjusting the polarization state of the output light of the light source. According to the device, the high degree of polarization light source and the high extinction ratio polarization device are combined, the measuring noise in the optical coherent domain polarization can be restrained through increasing the extinction ratio of signal light injected into the device to be detected, and measuring accuracy to the device polarization feature of the device is improved. The device and detecting method for restraining polarization crosstalk measuring noise by the adoption of the light source are simple in structure, excellent in performance and easy to adjust, and can be widely applied to the field of high accuracy measuring and analyzing to optical performances of optical type polarization-maintaining devices and the like.
Description
Technical field
What the present invention relates to is a kind of optical fiber measurement device, is specifically related to a kind of device that utilizes light source to suppress polarization crosstalk measurement noise.
Background technology
Optical coherence territory Polarization Detection (OCDP) based on white light interference principle is the most promising optical fiber measurement technical scheme of one.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, compared with technology, OCDP technology has (based on the interferometer such as Mach-Zehnder or Michelson) simple in structure, (the coupling-90 of high spatial resolution (several centimetres), wide-measuring range (several kilometers), super high measurement sensitivity
~-100dB), super big dynamic range (10
9～10
10) etc. advantage.The future development of OCDP technology becomes a kind of high precision, universal test technology and system and becomes a kind of inexorable trend.
As far back as the eighties, start research just improving Polarization Detection precision abroad.Early 1990s, the people such as France Herve Lefevre (disclose the OCDP system 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 based on white light interference principle first, US4893931), its adopt 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 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 Fiberpro company of Korea S has released is mainly used in replacing WIN-P series OCDP system, spatial resolution 10cm, and scanning polarization maintaining optical fibre length by length is increased to 1000m, bring up to-80dB of sensitivity.
2011, the people such as the 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, US20110277552), utilize and before light path correlator, increase optical path delay device, 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.: CN201110052231.3) of polarization extinction ratio of optical polarizer, the same core apparatus of space interference light path as OCDP that adopt, 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.: CN201210379406) that a kind of optical device polarization interference is measured, this invention adopts full test optical fiber measurement device precision high, there is good temperature 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) that improves optical device polarization interference measurement performance, this invention adopts the Mach-Zehnder light path correlator that contains polarization beam splitting function, utilize fiber rotation connector, can greatly suppress noise amplitude, improve sensitivity and dynamic range that polarization interference is measured, risen to respectively-95dB and 95dB.
In optical coherence territory polarimetry technology, the polarization property of device under test---polarization crosstalk information is mainly reflected on the peak amplitude and light path position of interference signal: the former is directly proportional to the power coupling factor amplitude of cross-talk, and the latter is corresponding with the occurrence positions of cross-talk in device.In the ideal case, by after device under test, only there is polarization coupled one time at fault location in the pure line polarisation that light source sends, and its power is all directly proportional to power and the cross-talk size of transmission light.If light source does not have desirable linear polarization characteristic, when main pole polarization direction (elliptically polarized light major axis) causes polarization crosstalk, in its orthogonal polarization polarization direction can there is polarization coupled phenomenon in (elliptically polarized light minor axis) equally, and interference peak is now for measurement, being conventionally construed to is optical noise.The signal of optical noise and device polarization crosstalk is overlapped, must cause the performance of device under test to produce erroneous judgement, and then the precision of optical coherence territory polarimetry is produced and had a strong impact on.If the luminous energy of light source vertical direction is not limited, optical noise quantity will increase, amplitude will improve, thereby causes the polarization crosstalk signal of high performance device to differentiate, and equivalence has reduced measurement sensitivity.
If in existing full test optical fiber device, by changing light-source structure composition, on source, suppress the introducing of polarization noise, make great efforts to improve source degree of polarization, make the small polarization coupled intensity of vertical light component in light source elliptically polarized light drop to enough low level, reach the object that suppresses optical noise, improves the measuring accuracy of system, for optical coherence polarimetry, there is great practical value.
Summary of the invention
The object of the present invention is to provide and a kind ofly can improve measuring accuracy to device polarization characteristic, simple in structure, function admirable, adjusting are easy to utilize light source to suppress polarization crosstalk measures the device of noise.The present invention also aims to provide a kind of method of utilizing light source to suppress polarization crosstalk measurement noise.
The object of the present invention is achieved like this:
The device that utilizes light source to suppress polarization crosstalk measurement noise of the present invention comprises wide spectrum light source 100, polarizer to be measured 110, light path correlator 120, difference detecting device 130, photosignal conversion and signal recording apparatus 140; Wide spectrum light source 100 comprises low-coherence light source 101, polarization state controller 102, the polarizer 103 of high-polarization, and the low-coherence light source 101 of high-polarization regulates and is connected with polarizer 103 linearly polarized light of exporting high-polarization via polarization state controller 102; The linearly polarized light of high-polarization enters into light path correlator 120 by the 1st rotary connector 111, testing fiber device 112, the 2nd rotary connector 113, analyzer 114 successively; Analyzer 114 is connected with the 1st coupling mechanism 121 by input port 1a, and output port 1c, the 1d of the 1st coupling mechanism 111 interferes the scan arm 1A in arms to be connected with reference arm 1B with two of light path correlator 110 respectively; Light scans by displacement scanister 125, converges interference with the light in reference arm 1B at two input port 1e, 1f of the 2nd coupling mechanism 122; Two output terminals of the 2nd coupling mechanism 122 are finally connected with difference detecting device 130; After difference, signal is input to interference signal and detects and analyze with treating apparatus 140.
The device that utilizes light source to suppress polarization crosstalk measurement noise of the present invention can also comprise:
1, described polarization state controller 102 is made up of input optical fibre 2a, the 1st fiber optic loop the 21, the 2nd fiber optic loop the 22, the 3rd fiber optic loop 23, output optical fibre 2b, and its input optical fibre 2a and output optical fibre 2b are single-mode fiber.
2, described polarization state controller 102 is made up of input optical fibre 3a, optical fiber squeezer 31, optic fibre turning device 32, output optical fibre 3b, realizes Polarization Control by extruding, torsion, and its input optical fibre 3a and output optical fibre 3b are single-mode fiber.
3, described polarizer 103 is the waveguide-type polarizers 6 that are made up of lithium columbate crystal material, only supports the transmission of a polarization polarised direction guided mode in waveguide chip 62, and has high extinction ratio, >=80dB; Input optical fibre 61 is single-mode fiber, and output optical fibre 63 is polarization maintaining optical fibre.
The method of utilizing light source to suppress polarization crosstalk measurement noise of the present invention is:
1, the wide spectral range low-coherence light source of high-polarization 101 being sent, high linearly polarized light are injected in 1 × 2 fiber coupler 104, the 1st output terminal connects the 1st photodetector 105, carry out corresponding status monitoring, the 2nd output terminal connects polarization state controller 102, polarizer 103;
2, regulate polarization state controller 102, the low-coherence light source 101 that changes high-polarization is exported the major axis angle of light, makes its light intensity after polarizer 103 reach maximum;
3, regulate waveguide chip 62 and output optical fibre 63 angles, the two is carried out axle at fast axle or slow-axis direction, at solder joint, weld at 106 places, and error is less than 0.2 °;
4, the linearly polarized light that the low-coherence light source 101 of high-polarization sends after related device adjustment, successively by polarizer 110 to be measured, light path correlator 120, difference detecting device 130, after difference, signal is input to interference signal and detects with treating apparatus 140 and analyze.
The present invention has introduced to have the light-source structure that suppresses polarization crosstalk measurement noise function.Wide spectrum light source is the low-coherence light source with high-polarization, places the polarizer with High Extinction Ratio after light source; Between light source and polarizer, connect polarization state controller, by light source output polarized state of light is regulated, linearly polarized light is strictly overlapped with the polarizing angle of polarizer.This device combines high-polarization light source and High Extinction Ratio polarizer, is injected into the extinction ratio of flashlight in device under test by raising, suppresses the measurement noise in the polarimeter of optical coherence territory, improves the measuring accuracy to device polarization characteristic.The advantage such as that the present invention has is simple in structure, function admirable, adjusting are easy, can be widely used in optical-fiber type and protect the field such as high-acruracy survey and analysis of inclined to one side device optical property.
The present invention is a kind of technological improvement of light-source structure in the full test optical fiber device (OCDP) that typical optical device polarization interference is measured, and makes it have the function that suppresses polarization crosstalk measurement noise.
Ideally, only having the light that ought be input in the polarimeter of optical coherence territory is strict linearly polarized light, i.e. extinction ratio PER
swhen=∞, just there is the test extinction ratio PER of test component to equal the true extinction ratio PER of device
chip.And this ideal situation cannot be realized, by improving constantly the delustring ratio of light source output, make to test delustring ratio and device actual value and constantly approach, be a kind of effective ways that improve the measuring accuracy of optical coherence territory polarimeter to device polarization crosstalk.
In the full test optical fiber device (accompanying drawing 4) of measuring at typical optical device polarization interference, the Lights section only has wide spectrum light source SLD and the optical fiber polarizer, due to the polarizer self defective workmanship, delustring is smaller, the natural light 5a that wide spectrum light source SLD sends is difficult to form theoretic linearly polarized light after optical fiber polarizer P1, but has less ovality angle θ
1elliptically polarized light (5b).Its extinction ratio is
Ovality angle θ
1closely related with the characteristic of optical fiber polarizer P1.Will be with θ
1elliptically polarized light be delivered directly to light path correlator via polarizer to be measured and test, the test extinction ratio PER obtaining is subject to PER
1affect very large.And domestic SLD source degree of polarization is in 40% left and right, and along with external environment changes and fluctuates, now will cause polarization phase error.
Measure in the device (accompanying drawing 1) of noise utilizing light source to suppress polarization crosstalk, wide spectrum light source is the polarized light source with high-polarization, and its light sending can have been regarded as and has less ovality angle θ
2elliptically polarized light 5c, through polarization state controller axle is regulated, major axis, by polarizer P2, obtains desirable linearly polarized light (5d), total extinction ratio is
PER
2=PER
s+ PER
p(2) wherein, PER
sfor polarized light source extinction ratio, PER
pfor polarizer extinction ratio.
Know from formula (1), test extinction ratio PER is subject to optical fiber polarizer performance impact, and the inferior optical fiber polarizer has directly reduced the precision of test extinction ratio PER; Know from formula (2), test extinction ratio PER is subject to the extinction ratio sum performance impact of polarized light source and polarizer, by the type selecting to the two, can improve constantly the precision of test extinction ratio PER, reduces the impact of other noise, makes test result to true extinction ratio PER
chipapproach.
By the improvement of light-source structure, by the optical fiber polarizer combination of high polarized light source and High Extinction Ratio, improve light source and related device polarization characteristic from root, improved the quality that is input to polarized light in polarizer to be measured: more than bringing up to 98dB by lower 40dB.Reach the polarization interference noise that suppresses entire system, improved the object of the measuring accuracy of optical coherence territory polarimeter to device polarization crosstalk.
Compared with prior art, tool of the present invention has the following advantages:
(1) compared with using low polarization wide spectrum light source, this scheme adopts high-polarization wide spectrum light source, from source, improves the polarization property of testing light source, obvious to the inhibition of test macro optical noise;
(2) adopt high-performance polarizer part, and combine with the low-coherence light source of high-polarization, further improved the polarization property that is injected into the flashlight in device under test, greatly suppressed probability and amplitude that optical noise occurs.Without changing under the prerequisite of other hardware, sensitivity and the precision of the polarimetry of optical coherence territory are improved;
(3) adopt the polarization state modulation device of full optical fiber, in light path, without breakpoint, both can realize the adjusting of the full polarization state of light source, do not have again new optical noise to introduce;
(4) test macro adopts full optical fiber optical optical road, has that volume is little, measuring accuracy is high, temperature stability and an advantage such as vibrostability is good.
Brief description of the drawings
Fig. 1 is a kind of apparatus and method of utilizing light source to suppress polarization crosstalk measurement noise;
Fig. 2 is a kind of three rotation oar Polarization Controller schematic diagram of all optical fibre structure;
Fig. 3 is a kind of in-line arrangement Polarization Controller schematic diagram of all optical fibre structure;
Fig. 4 is the full test optical fiber device schematic diagram that a kind of typical optical device polarization interference is measured;
Fig. 5 is that light source passes through polarizer part polarization characteristic variation schematic diagram;
Fig. 6 is a kind of waveguide-type polarizer structural representation being made up of lithium columbate crystal material.
Embodiment
For example the present invention is described in more detail below in conjunction with accompanying drawing, but should limit the scope of the invention with this.
In conjunction with Fig. 1, the device that utilizes light source to suppress polarization crosstalk measurement noise of the present invention comprises wide spectrum light source 100, polarizer to be measured 110, light path correlator 120, difference detecting device 130, photosignal conversion and signal recording apparatus 140.
Wide spectrum light source 100 is made up of devices such as the low-coherence light source 101 of high-polarization, polarization state controller 102, polarizers 103; Low-coherence light source 101 and polarizer 103 extinction ratio sums that the extinction ratio of wide spectrum light source 100 entirety output light is high-polarization.
The low-coherence light source 101 of high-polarization has wide spectral range, high linearly polarized light (extinction ratio >=18dB) output; External output optical fibre is single-mode fiber.
Polarizer 103 is the waveguide-type polarizers 6 that are made up of lithium columbate crystal material; In waveguide chip 62, only support the transmission of a polarization polarised direction guided mode, and there is high extinction ratio (>=80dB); Input optical fibre 61 is single-mode fiber, and output optical fibre 63 is polarization maintaining optical fibre.
The low-coherence light source 101 of high-polarization regulates via polarization state controller 102, is connected with polarizer 103 linearly polarized light of exporting high-polarization.
In the polarimeter of optical coherence territory, the linearly polarized light that the low-coherence light source 101 of high-polarization sends after related device adjustment, by the 1st rotary connector 111, testing fiber device 112, the 2nd rotary connector 113, analyzer 114, enter into light path correlator 120 successively; Be connected with the 1st coupling mechanism 121 by input port 1a; Output port 1c, the 1d of the 1st coupling mechanism 111 interferes the scan arm 1A in arms to be connected with reference arm 1B with two of light path correlator 110 respectively; Light scans by displacement scanister 125, converges interference with the light in reference arm 1B at two input port 1e, 1f of the 2nd coupling mechanism 112; Two output terminals of the 2nd coupling mechanism 112 are finally connected with difference detecting device 130; After difference, signal is input to interference signal and detects and analyze with treating apparatus 140.
Are three rotation oar Polarization Controllers for all optical fibre structure in conjunction with a kind of scheme of the polarization state controller 102 described in Fig. 2, do not contain optics point of discontinuity; It is made up of input optical fibre 2a, the 1st fiber optic loop the 21, the 2nd fiber optic loop the 22, the 3rd fiber optic loop 23, output optical fibre 2b, in function, the light signal of random polarization state can be converted into other random polarization state light signal; In structure, be similar to the 1/4 λ wave plate of having connected successively, a 1/2 λ wave plate and a 1/4 λ wave plate; Wave cooperatively interacting of adjusting by three fiber optic loop, can realize all polarization state control; Its input optical fibre 2a and output optical fibre 2b are single-mode fiber.
Another kind of scheme in conjunction with the polarization state controller 102 described in Fig. 3 is extruding twisted fiber structure, and it is made up of input optical fibre 3a, optical fiber squeezer 31, optic fibre turning device 32, output optical fibre 3b; By extruding, torsion, realize Polarization Control; Its input optical fibre 3a and output optical fibre 3b are single-mode fiber.
Utilize light source to suppress a method for polarization crosstalk measurement noise, it is characterized in that:
1) wide spectral range low-coherence light source of high-polarization 101 being sent, high linearly polarized light are injected in 1 × 2 fiber coupler 104, the 1st output terminal connects the 1st photodetector 105, carry out corresponding status monitoring, the 2nd output terminal connects polarization state controller 102, polarizer 103;
2) regulate polarization state controller 102, the low-coherence light source 101 that changes high-polarization is exported the major axis angle of light, makes its light intensity after polarizer 103 reach maximum;
3) regulate waveguide chip 62 and output optical fibre 63 angles, the two is carried out axle in fast axle (or slow axis) direction, at solder joint, weld at 106 places, and error is less than 0.2 °;
4) linearly polarized light that the low-coherence light source 101 of high-polarization sends after related device adjustment, successively by polarizer 110 to be measured, light path correlator 120, difference detecting device 130, after difference, signal is input to interference signal and detects with treating apparatus 140 and analyze.
Main devices type selecting and the parameter of optical coherence territory polarimeter are as follows:
1) the centre wavelength 1550nm of polarized light source, half spectral width are greater than 30nm, fiber power is greater than 5mW, and extinction ratio is 18dB;
2) three of all optical fibre structure rotation oar Polarization Controllers, fiber optic loop diameter 27mm, oar rotation angle range ± 117.5 °, bending loss is less than 0.1dB;
3) polarizer is the waveguide-type polarizer that lithium columbate crystal material forms, tail optical fiber front end order mode fiber, and rear termination polarization maintaining optical fibre, and the fast axle of waveguide aims at the fast axle of polarization maintaining optical fibre, and the extinction ratio of chip is 80dB;
4) the splitting ratio 2:98 of 1 × 2 fiber coupler, operation wavelength 1550nm;
5) testing fiber device is 200m panda type polarization-preserving fiber;
6) centre wavelength of removable optical mirror is 1550nm, and diameter is 20mm, thick 2mm, and average reflectance is greater than 95%;
7) operation wavelength of three port circulators is 1550nm, and insertion loss is 1dB, and isolation is greater than 50dB;
8) operation wavelength of collimation lens is 1550nm, in the scope of displacement platform sweep limit 0～200mm, and insertion loss 2dB, loss fluctuation is less than 0.2dB;
9) the splitting ratio 50:50 of 2 × 2 fiber couplers, operation wavelength 1550nm.
The course of work of proving installation is as follows:
Polarized light source 101 is exported light through 1 × 2 fiber coupler 104 beam splitting, fraction energy is monitored from detector 105 outputs, most of light arrives polarizer 103 through the accurate adjustment of polarization state controller 102, the linearly polarized light that polarizer 103 is exported, locate to realize 0 ° of welding with rearmounted polarization fiber at fast axle (or slow axis) at solder joint (106), and then obtain comparatively pure linearly polarized light.
Through rotary connector 111, accurate 45 ° to axle the slow axis to the input end of device under test polarization maintaining optical fibre, light signal is exported via 45 ° of rotary connectors 113 through its tail optical fiber; Light mixes in optical fiber analyzer 114, is evenly divided into two bundles by 2 × 2 fiber couplers 121, enters into two arms of light path correlator 120; Light in scan arm 1A is by the light path scanning of displacement scanister 125, and when the optical path difference producing between two arms matches from the signal transmission with different optical path differences to be measured, difference detecting device 130 is exported white light interference signal; Finally by crossing difference, signal is input to interference signal detection and carries out interpretation of result with treating apparatus 140.Its interference peak is directly proportional to the amplitude of light signal to be measured, and corresponding light path scanning position is directly proportional to the light path of measured signal.
Obtained by formula (2), the extinction ratio that enters into device under test light at 106 solder joint places is PER
2=18+80=98dB.
It should be noted that, 1) polarizer 103 front ends will be with the light through polarization state controller 102 accurately to axle: the major axis of the elliptically polarized light that polarized light source the sends fast axle (or slow axis) intrinsic with polarizer highly overlaps, and shows as and makes light light intensity after polarizer 103 reach maximal value; 2) polarizer 103 rear ends will be at solder joint 106 with polarization maintaining optical fibre accurately to axle: the two intrinsic fast axle (or slow axis) of polarizer and polarization maintaining optical fibre highly overlaps.
Polarizer axle precision is had an immense impact on to the polarization state of whole the Lights section.Improve the measuring accuracy of optical coherence territory polarimeter to device polarization crosstalk, in improving light-source structure, be also noted that between each optical device to axis error.
Claims (5)
1. utilize light source to suppress a device for polarization crosstalk measurement noise, comprise wide spectrum light source (100), polarizer to be measured (110), light path correlator (120), difference detecting device (130), photosignal conversion and signal recording apparatus (140); It is characterized in that: wide spectrum light source (100) comprises low-coherence light source (101), polarization state controller (102), the polarizer (103) of high-polarization, the low-coherence light source (101) of high-polarization regulates and is connected with polarizer (103) linearly polarized light of exporting high-polarization again via polarization state controller (102); The linearly polarized light of high-polarization enters into light path correlator (120) by the 1st rotary connector (111), testing fiber device (112), the 2nd rotary connector (113), analyzer (114) successively; Analyzer (114) is connected with the 1st coupling mechanism (121) by input port (1a), and the output port (1c) of the 1st coupling mechanism (111), (1d) are connected with reference arm (1B) with the scan arm (1A) in two interference arms of light path correlator (110) respectively; Light, by displacement scanister (125) scanning, converges interference with the light in reference arm (1B) at two input ports (1e, 1f) of the 2nd coupling mechanism (122); Two output terminals of the 2nd coupling mechanism (122) are finally connected with difference detecting device (130); After difference, signal is input to interference signal and detects and analyze with treating apparatus (140).
2. the device that utilizes light source to suppress polarization crosstalk measurement noise according to claim 1, it is characterized in that: described polarization state controller (102) is made up of input optical fibre (2a), the 1st fiber optic loop (21), the 2nd fiber optic loop (22), the 3rd fiber optic loop (23), output optical fibre (2b), and its input optical fibre (2a) and output optical fibre (2b) are single-mode fiber.
3. the device that utilizes light source to suppress polarization crosstalk measurement noise according to claim 1, it is characterized in that: described polarization state controller (102) is made up of input optical fibre (3a), optical fiber squeezer (31), optic fibre turning device (32), output optical fibre (3b), realize Polarization Control by extruding, torsion, its input optical fibre (3a) and output optical fibre (3b) are single-mode fiber.
4. suppress the device of polarization crosstalk measurement noise according to the light source that utilizes described in claim 1,2 or 3, it is characterized in that: described polarizer (103) is the waveguide-type polarizer (6) being made up of lithium columbate crystal material, in waveguide chip (62), only support the transmission of a polarization polarised direction guided mode, and there is high extinction ratio, >=80dB; Input optical fibre (61) is single-mode fiber, and output optical fibre (63) is polarization maintaining optical fibre.
5. a method of utilizing light source to suppress the detection of polarization crosstalk measurement noise device claimed in claim 1, is characterized in that:
1) wide spectral range low-coherence light source of high-polarization (101) being sent, high linearly polarized light are injected in 1 × 2 fiber coupler (104), the 1st output terminal connects the 1st photodetector (105), carry out corresponding status monitoring, the 2nd output terminal connects polarization state controller (102), polarizer (103);
2) regulate polarization state controller (102), change the major axis angle of low-coherence light source (101) the output light of high-polarization, make its light intensity after polarizer (103) reach maximum;
3) regulate waveguide chip (62) and output optical fibre (63) angle, the two is carried out axle at fast axle or slow-axis direction, at solder joint, weld at 106 places, and error is less than 0.2 °;
4) linearly polarized light that the low-coherence light source of high-polarization (101) sends after related device adjustment, successively by polarizer to be measured (110), light path correlator (120), difference detecting device (130), after difference, signal is input to interference signal and detects with treating apparatus (140) and analyze.
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