CN103900799B - A kind of optical coherence polarimeter that suppresses interaction noise - Google Patents
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Abstract
The present invention is to provide a kind of optical coherence polarimeter that suppresses interaction noise. It is detected with tape deck and is formed by high polarization stability wide spectrum light source, element under test, light path demodulating equipment, polarization crosstalk, in light path demodulating equipment, eliminate the Faraday polarization apparatus of optical interference polarization decay effect and the optical circulator for light path difference detecting containing being useful on, before Faraday polarization apparatus, optical circulator, place respectively polarization state controller; By the adjusting to transmission light polarization state, make to input polarisation of light state and meet the minimal reflection condition under Brewster angle, reduce with abatement device in remaining reflected light signal, reach and suppress optical interference noise, improve polarization crosstalk and measure the object of sensitivity. This device has that certainty of measurement is high, dynamic range is large, volume is little, it is easy to regulate, loss is low, high reliability, can be widely used in the optical property quantitative test of the above High Extinction Ratio integrated waveguide of 80dB and polarization optics device.
Description
Technical field
What the present invention relates to is a kind of optical fiber measurement device, specifically a kind of optics with optical interference noise suppressing functionCross polarization measurement mechanism.
Background technology
Optical coherence territory polarimetry technology (OCDP) is a kind of high accuracy distributed polarization coupling measurement technology, and it is based on wideSpectrum interference of light principle, carries out optical path compensation by scan-type optical interdferometer, realizes the interference between different polarization pattern, can be to partiallyLocus, the polarization coupled signal strength signal intensity of crosstalking of shaking carried out high-precision measurement and analysis, and then acquisition optical polarization deviceThe important parameters such as extinction ratio, bat length. OCDP technology is as a kind of detection side of very promising distributed optical polarization performanceMethod, is widely used in polarization maintaining optical fibre manufacture, polarization maintaining optical fibre accurately to fields such as axle, the tests of device extinction ratio. With other as: partiallyTime domain reflection technology (POTDR), optical frequency domain reflection technology (OFDR), light coherent field reflection technology (OCDR) decile shakeCloth formula detection method is compared with technology, and that OCDP technology has is simple in structure, high spatial resolution (5～10cm), measure model greatlyEnclose (measuring several kilometers of length), super high measurement sensitivity (coupling energy-80～-100dB), super big dynamic range (108～1010)Etc. advantage, be hopeful very much to develop into a kind of high accuracy, universal test technology and system. Due to it the most directly and trulyThe transport behavior of flashlight in optic fibre light path described, thus be particularly suitable for optical fibre device, assembly, and optical fibre gyroTest and assess etc. high accuracy, superhigh precision interference-type optical fiber sensing light path.
Early 1990s, the people [Methodforthedetectionofpolarization such as French HerveLefevrecouplingsinabirefringentopticalsystemandapplicationofthismethodtotheassemblingoftheComponentsofanopticalsystem, USPatent4893931] the OCDP system based on white light interference principle disclosed firstSystem, its adopt super-radiance light emitting diode (SLD) as light source and space interference light path as light path measurement of correlation structure. MethodPhotonetics company of state has developed WIN-P125 and two kinds of model OCDP test macros of WIN-P400 according to this patented technology,Be mainly used in shorter (500m) and grow the polarization characteristic analysis of (1600m) polarization maintaining optical fibre. Its main performance is polarization interferenceSensitivity for-70dB, dynamic range be 70dB, after through improvement, rise to respectively-80dB of sensitivity and dynamic range and 80dB.
2011, the people such as the Zhang Hongxia of University Of Tianjin disclosed a kind of detection method of polarization extinction ratio of optical polarizer and have detected dressPut (Chinese Patent Application No.: 201110052231.3), adopt equally the core apparatus of space interference light path as OCDP, logicalCross the stiffness of coupling that detects Coupling point, derive polarization extinction ratio. This device be applicable to polarization maintaining optical fibre, polarization-maintaining fiber coupler,The measurement of the multiple optical polarization device such as polarizer. Compared with the people's such as HerveLefevre scheme, technical performance and index are close.
In the same year, the people such as the Yao Xiaotian of AM General photoelectricity company (GeneralPhotonicsCorporation) disclose one and have been used forThe full optical measuring system of distributed polarization interference measurement in polarization maintaining optical fibre and optical birefringence material (US20110277552,MeasuringDistributedPolarizationCrosstalkinPolarizationMaintainingFiberandOpticalBirefringentMaterial), utilize and before light path correlator, increase optical path delay device, spuious white while suppressing polarization interference measurementThe quantity of optical interference signals and amplitude. The method can be by the bring up to-95dB of polarization interference sensitivity of full optical measuring system, butDynamic range remains on 75dB.
2012, applicant of the present invention proposed polarization crosstalk testing arrangement based on full optical fiber optical optical road (Chinese Patent Application No.:CN201210379406.6) and improve optics polarization crosstalk measurement performance method (Chinese Patent Application No.:CN201210379407.0), the technical scheme that adopts full optical fiber optical optical road and suppress to clap noise, greatly suppresses noise amplitude, makes partiallyThe sensitivity of crosstalk measurement of shaking brings up to-and more than 95dB, dynamic range can correspondingly remain on 95dB simultaneously, and has reduced surveyThe volume of test system, has increased Measurement sensibility.
Along with the development of optical coherence polarimetry technology, detectivity constantly improves, from-march toward gradually-100dB of 95dBTime, the interference of light peak that the spurious reflections signal producing in optical path and main interference flashlight produce will become and have a strong impact on surveyThe optical noise of amount. If optical noise and measuring-signal interference peak are overlapped, the performance measurement to device is produced to erroneous judgement,Severe patient makes to measure and cannot carry out. The main cause that produces spurious reflections signal is the discontinuous of fiber optic component and optic fibre light path, asFaraday polarization apparatus is generally made up of the element of multiple difference in functionalitys such as tail optical fiber, collimater, polarization apparatus, speculum, anti-at opticsThe interface of penetrating, has the very faint reflected light signal of intensity and produces, the amplitude size return loss characteristic of its reflected signalDescribe. For optic communication device, General Requirements return loss is controlled at-below 55dB, just can ignore its impact; AndFor optical coherence polarimetry technology, compare the detectivity of-90～-100dB, above-mentioned return loss is wanted large 3～4The order of magnitude, can not ignore completely. If particularly its transmission direction of multiple reflections veiling glare signal is identical with main interference light, withoutMethod is eliminated by the general method such as optically filtering and cut-off; They are discrete with reference light on light path, and amplitude needs onlyBe greater than the detectivity of system, within optical path difference drops on light path sweep limits, just can exert an influence. Therefore, at optical coherenceIn polarimetry light path, the veiling glare signal that how to suppress and eliminate, becomes the major issue of demodulation light path structural design and optimization.
Summary of the invention
The object of the present invention is to provide a kind of elimination and optical interference that can realize the remaining reflected light signal of device in optical path to make an uproarThe inhibition of sound, raising polarization crosstalk is measured the optical coherence polarimeter of the suppressed interaction noise of sensitivity.
The object of the present invention is achieved like this:
Comprise that high polarization stability wide spectrum light source 1, light path demodulating equipment 3, polarization crosstalk detect and tape deck 4;
1) described light path demodulating equipment is by analyzer 31, the first Polarization Controller 32, optical circulator 33, Michelson type lightJourney correlator 34, optical attenuator 37, interference signal differential detector 36 form, and the first Polarization Controller 32 is by controlling tail optical fiberThe polarization state of transmission light in 331, suppresses the residual light reflection of optical circulator 33;
2) described Michelson type light path correlator 34 is by 2 × 2 fiber couplers 342, optical path delay line 35, the second polarizationController 344, the 3rd Polarization Controller 347, the first faraday polariscope 345 and the second Faraday mirror 348 form, theTwo Polarization Controllers 344 control transmission light in the fixed arm 343 of light path correlator 34 polarization state, suppress the first faraday and revolveThe residual light reflection 58B of light microscopic 345, the 3rd Polarization Controller 347 is controlled transmission light in dry light path correlator 34 scan arms 346Polarization state, suppress the residual light reflection 58B of the second Faraday mirror 348;
3) interference signal differential detector 36 is connected to light path correlator 34 by optical circulator 33 and optical attenuator 37Input tail optical fiber 341, output 349, for surveying interference signal.
The first faraday polariscope 345 is by the first input optical fibre 51, the 3rd optical collimator 52, the first gyrotropi crystal 53, firstMagnet ring 54, the first speculum 55 form, for the flashlight reflection at light path correlator 34 fixed arms 343 by transmission, andBy polarization state half-twist; The second Faraday mirror 348 is revolved by the second input optical fibre 61, the 4th optical collimator 62, secondLuminescent crystal 63, the second magnet ring 64, the second speculum 65 form, for by transmission at light path correlator 34 scan arms 346Flashlight reflection, and by polarization state half-twist.
First, second, third described Polarization Controller the 32,344, the 347th, all optical fibre structure, does not contain optics discontinuity point;Its function is to enter the random polarization state optical signal of incident light of optical fiber, can export the flashlight of appointment polarization state after controlling; CanTo adopt fiber optic loop structure, it is by input optical fibre 81, λ/4 fiber optic loop 82, the 2nd λ/2 fiber optic loop 83, the 3rd λ/4 lightFine ring 84 and output optical fibre 85 form; Or adopt extruding twisted fiber structure, it by input optical fibre 91, optical fiber squeezer 92,Optic fibre turning device 93, output optical fibre 94 form.
Described optical path delay line 35 is a kind of transmission-type optical path delay devices, and optical signal can enter from the first optics collimator 351Penetrate, after corner reflector 352 reflections, from the second optics collimator 353 outgoing, vice versa.
The wide spectrum light source 11 of described high polarization stability wide spectrum light source 1 will connect by the first output 13 of fiber coupler 12Connect the first photodetector 14; After fibre optic isolater 16, be connected in the optical fiber polarizer 17 by the second output 15.
Optical attenuator 37 its insertion loss are chosen as the input tail optical fiber 331 of optical circulator 33 to the input tail optical fiber of light path correlator 34341, with the input tail optical fiber 341 of the light path correlator 34 insertion loss sum to the second output tail optical fiber 332 of optical circulator 33.
Described light path demodulating equipment 3 forms the tail optical fiber of device, except the first Polarization Controller 32, is single-mode fiber.
There is the optical coherence polarimeter of optical interference noise suppressing function, as shown in Figure 1, in order to eliminate optical interferencePolarization decay effect, light path demodulating equipment adopts the Michelson light path correlator with Faraday polarization apparatus, in order to improve surveyThe dynamic range of amount has adopted the light path difference detecting structure with optical circulator. But the introducing of above-mentioned optical fibre device, tooIncrease the optics discontinuity point in optical path, increased the probability that produces spurious reflections signal, caused optical interference noiseDeteriorated.
The optical coherence polarimeter that the present invention proposes suppresses optical interference noise core concept: by suppressing fiber optic componentWith the spurious reflections signal that optic fibre light path produces, reduce quantity and the amplitude at its white light interference peak, reach the order that suppresses optical noise. As shown in Figure 2, when a branch of incident light 56 (or 66) incides two media n1And n2Interface 73 time, can send out, there is reverberation 56A (or 66A) and refract light 57 (or 67) in raw reflection and refraction effect; By Fresnel formulaKnown, in the time that input angle 72 is certain specific angle (being Brewster angle), reverberation 56A (or 66A) will only comprise vibrationThe linearly polarized light that direction is vertical with the plane of incidence, Brewster angle θ can be expressed as
If now adjust the polarization state of input light 56 (or 66), as shown in Figure 3, it only had and be parallel to shaking of the plane of incidenceMoving direction, reverberation 56A (or 66A), by suppressed, disappears even, incident light 56 (or 66) whole withRefract light 57 (or 67) outgoing.
In order to reduce and eliminate the remaining reverberation of Faraday polarization apparatus and optical circulator in optical path, can before device, putPut polarization state controller, by transmission polarized state of light is regulated, make to input polarisation of light state and meet under Brewster angle and vibrateDirection is parallel to the condition of the plane of incidence, carrys out amplitude and the quantity of remaining reflected signal light in suppression device, makes the return loss of deviceFrom-55～-60dB bring up to-more than 80dB, realize the inhibition of the interaction noise of white light interferometric, reach improve polarization crosstalk surveyThe object of amount sensitivity.
Compared with prior art, the invention has the advantages that:
(1) adopt full fiber type polarization state controller to eliminate the residual light reflection of optics, can not change on the one hand light path solutionAdjust light channel structure and the parameter of device, can keep all advantages of former optical path, also can not introduce on the other hand new opticsNoise, has that control method is easy, noise suppression effect good, loss is low, high reliability;
(2) the light path demodulating equipment of employing Faraday polarization apparatus, has overcome the polarization decay effect in optical interference, improves and measuresEnvironmental suitability and reliability;
(3) adopt differential optical sniffer to interference signal demodulation, increased the signal to noise ratio that polarization crosstalk is measured, expanded surveyThe dynamic range of amount;
(5) adopt full optical fiber optical optical road, have that volume is little, certainty of measurement is high, an advantage such as temperature stability and anti-vibration good stability,Reduce the requirement of measurement mechanism to environment.
Brief description of the drawings
Fig. 1 is the all-fiber coherent polarimeter principle schematic with polarization state controller and Faraday polarization apparatus;
Fig. 2 is in the time of Brewster angle incidence angle, the reflection and transmission light path schematic diagram of the incident light of random polarization state;
Fig. 3 is in the time of Brewster incidence angle, is parallel to the transmitted light path schematic diagram of the polarised light of the plane of incidence;
Fig. 4 is the schematic diagram of tricyclic optical fiber polarisation state controller;
Fig. 5 is the schematic diagram of the complete optical fiber polarization state controller based on extruding and torsion;
Fig. 6 is the internal structure of Faraday polarization apparatus and the light path schematic diagram that remaining reverberation produces;
Fig. 7 is the process schematic diagram that the remaining reverberation of Faraday polarization apparatus produces interferometric optical noise;
Fig. 8 is the polarization crosstalk measurement result figure with the optical interference noise of remaining reverberation generation;
Fig. 9 is in the time of Brewster incidence angle, is parallel to the polarised light of the plane of incidence in the transmission light path of Faraday polarization apparatus insideFigure;
Figure 10 eliminates after the remaining reverberation of Faraday polarization apparatus 348, suppresses the optical principle schematic diagram that interaction noise produces;
Figure 11 is the polarization crosstalk measurement result of eliminating after the interaction noise of Faraday polarization apparatus 348 in light path correlator scan armFigure;
Figure 12 is the polarization crosstalk measurement result of eliminating after the interaction noise of Faraday polarization apparatus 345 in light path correlator fixed armFigure.
Detailed description of the invention
For the optical coherence polarimeter of the optical noise inhibition that the present invention relates to of explanation clearly, in conjunction with the embodiments andThe invention will be further described for accompanying drawing, but should not limit the scope of the invention with this.
Optical coherence polarimeter as shown in Figure 1, select as follows by the parameter of concrete device:
(1) the centre wavelength 1550nm of wideband light source 11, half spectral width is greater than 45nm, and fiber power is greater than 2mW, light sourceSpectrum ripple < 0.05dB (be approximately-60dB of peak amplitude), the light path scope 4～7mm at relevant peak;
(2) 2/98 fiber coupler 12 operation wavelength 1550nm, splitting ratio 2:98;
(3) fibre optic isolater 16 operation wavelength 1550nm, insertion loss 0.8dB, isolation > 45dB;
(4) operation wavelength of the optical fiber polarizer 17, optical fiber analyzer 31 is 1550nm, and extinction ratio is 30dB, insertion lossBe less than 1dB;
(5) fiber optical circulator 33 is three-port circulator, insertion loss 1dB, and return loss is greater than 55dB;
(6) operation wavelength of fiber coupler 342 is 1310/1550nm, splitting ratio 50:50;
(7) operation wavelength of first, second collimation lens 351,353 is 1550nm, it and corner reflector 352 (reflectivityBe more than 92%) between light path scanning distance between 0～200mm, change greatly, average insertion loss is 2.0dB, lossIn fluctuation ± 0.2dB, and corner reflector 352 is approximately in the time of 100mm position, Michelson type light path correlator 34Fixed arm 343 and the optical path difference of scan arm 346 be approximately zero;
(8) operation wavelength of first, second Faraday polarization apparatus is 1550nm, 90 ° of optically-active angles, and angular error ± 1 °,Insertion loss 0.8dB, return loss is greater than 55dB;
(9) the operation wavelength 1550nm of fibre optic attenuator, insertion loss 2dB;
(10) light-sensitive material of first, second differential detector 361 and 362 is InGaAs, and optical detection scope is1100～1700nm, responsiveness is greater than 0.85;
(12) first, second, third polarization state controllers 32,344,347 can be selected the full optical fiber controller of tricyclic, itsStructure as shown in Figure 4; Also can select to push twist mode optical fiber polarisation state controller, its structure as shown in Figure 5;
(13) device under test 2 is chosen as Y waveguide, and operation wavelength is 1550nm, the fast axle of waveguide tail optical fiber and waveguide chip fastAxle is aimed at, waveguide chip length 30mm.
The course of work of measurement mechanism is as follows:
The light splitting of the output light process fiber coupler 12 of wide spectrum light source 11, the isolation of fibre optic isolater 16 and the polarizer 17After polarization, become line polarisation, more partially input 45 ° of tail optical fiber 21 to axle solder joint through protecting inclined to one side output optical fibre 18 and the guarantor of Y waveguide 2,Light energy is injected in the fast and slow axis of waveguide chip 2D to be measured equably, and optical signal is divided into two bundles, transmits respectively at 2B and 2CIn; Inject tail optical fiber 22 from the flashlight of the first output channel 2B of Y waveguide, and through 45 ° of solder joints of tail optical fiber 311,In optical fiber analyzer 31 mix, then the first polarization state controller 32 and optical fiber circulator 33 laggard enter light path correlator 34.
Evenly be divided into two bundles from the flashlight fast, slow axis of Y waveguide 2 by fiber coupler 342, a branch of transmission is inclined to one side by secondIn the fixed arm 343 that the state of shaking controller 344 and the first Faraday polarization apparatus 345 form, a branch of transmission is by the first collimation in additionDevice 351, corner reflector 352, the second optics collimator 353, the 3rd Polarization Controller 347, the second Faraday mirror 348In the scan arm 346 of composition. In the time that corner reflector 352 motions realize light path scanning, the fixed arm of light path correlator 34 and scanningWhen the optical path difference producing between arm matches from the signal transmission with different optical path differences to be measured, interference signal differential detector 36To export white light interference signal. Its interference peak is directly proportional to the amplitude of optical signal to be measured, the light path scanning position that its peak value is correspondingBe directly proportional to the light path for the treatment of sidelight signal.
As shown in Figure 6, when transmission will be distinguished at the flashlight 66 of scan arm 346 in flashlight 56 and the transmission of fixed arm 343Enter first, second Faraday polarization apparatus 345 and 347. Taking the second GRIN Lens 52 as example, generally second certainlyCondenser lens 52 can produce faint Fresnel reflection light 56A, optical signal process with the upper flashlight 56 of interface 52B of airAfter polarization apparatus 53 transmissions and speculum 55 reflections, during again through interface 52B, can produce same faint Fresnel reflection light58B. Remaining reverberation 56A, 58B are identical with the transmission direction of flashlight 59, but on light path, are mutually discrete. In like manner,The first GRIN Lens 62 will produce remaining reverberation 66A, the 68B identical with the transmission direction of flashlight 69.
As shown in Figure 7, the middle two-beam of scan arm 346 (transmission light 59 and remaining reverberation 58B) and two of fixed arm 343Shu Guang (transmission light 69 and remaining reverberation 68B) produces the process schematic diagram of white light interference peak value: 1) as remaining reverberation 58BWhen there is light path and mate in transmission light 69, will produce interference peak 73, its amplitude is directly proportional to the light intensity of remaining reverberation 58B;2) in the time that transmission light 59 and transmission light 69 light path occurs mate, will produce interference peak 71, its amplitude and transmission light 59 and 69Luminous intensity be directly proportional, the difference of interference peak 73 and 71 scanning optical path lengths is the light of remaining reverberation 58B and transmission light 59Path difference; 3) in the time that transmission light 59 mates with remaining reverberation 68B generation light path, will produce interference peak 74, its amplitude and residualThe light intensity of coreflection light 68B is directly proportional, and the difference of interference peak 74 and 71 scanning optical path lengths is remaining reverberation 68B and transmissionThe optical path difference of light 69. The optical interference noise testing curve that Fig. 8 obtains for measurement, in figure, peak value 73 and 74 is respectively remainingThe interference peak that reverberation 58B, 68B produce.
In the time changing the state of second, third polarization state controller 344,347, in meeting Brewster angle incidence condition,Make the polarization state of incident light 56,66 be parallel to input face, can make the intensity of remaining reverberation 56A, 58B and 66A, 68BBe greatly suppressed even and disappear, as shown in Figure 9. To regulate the 3rd Polarization Controller 347 as example, can make remaining reflectionLight 56A and 58B disappear. The now transmission light 59 of scan arm 346 and transmission light 69 and the remaining reverberation 68B of fixed arm 343The white light interference peak value producing, as shown in figure 10, interference peak 73 will disappear. By controlling the 3rd Polarization Controller 347State, can suppress the optical interference noise of Faraday polarization apparatus 348, and its measured result as shown in figure 11. As shown in Figure 11,Reflection peak 73 is from-drop to-80dB of 59dB, lower than the Noise Background of measurement mechanism, thereby verified that this device is to dryRelate to the validity of noise suppressed.
In like manner, by controlling the state of the 3rd Polarization Controller 344, can suppress the optical interference of Faraday polarization apparatus 345 and make an uproarSound, as shown in figure 12, as shown in Figure 12, reflection peak 74 is from-drop to-80dB of 58dB for its measured result, lower thanThe Noise Background of measurement mechanism, has further verified the validity that this device suppresses interaction noise.
Claims (6)
1. an optical coherence polarimeter for interaction noise be can suppress, high polarization stability wide spectrum light source (1), light comprisedJourney demodulating equipment (3), polarization crosstalk detect and tape deck (4), it is characterized in that:
1) described light path demodulating equipment is by analyzer (31), the first Polarization Controller (32), optical circulator (33), MichelsonType light path correlator (34), optical attenuator (37), interference signal differential detector (36) connect to form, the first Polarization ControlDevice (32) suppresses the residual light reflection of optical circulator (33) by controlling the polarization state of transmission light in tail optical fiber (331);
2) described Michelson type light path correlator (34) by 2 × 2 fiber couplers (342), optical path delay line (35),The second Polarization Controller (344), the 3rd Polarization Controller (347), the first faraday polariscope (345) and the second faraday are revolvedLight microscopic (348) composition, the second Polarization Controller (344) is controlled the middle transmission light of fixed arm (343) of light path correlator (34)Polarization state suppress the residual light reflection (58B) of the first faraday polariscope (345), the 3rd Polarization Controller (347) controlMake the polarization state of transmission light in dry light path correlator (34) scan arm (346) and suppress the second Faraday mirror (348)Residual light reflection (58B);
3) interference signal differential detector (36) is connected to light path phase by optical circulator (33) and optical attenuator (37)Close input tail optical fiber (341), the output (349) of device (34), for surveying interference signal;
The first faraday polariscope (345) by the first input optical fibre (51), the 3rd optical collimator (52), the first gyrotropi crystal (53),The first magnet ring (54), the first speculum (55) composition, for transmitting at light path correlator (34) fixed arm (343)Flashlight reflection, and by polarization state half-twist; The second Faraday mirror (348) is by the second input optical fibre (61),Four optical collimators (62), the second gyrotropi crystal (63), the second magnet ring (64), the second speculum (65) composition, for passingDefeated flashlight reflection in light path correlator (34) scan arm (346), and by polarization state half-twist.
2. the optical coherence polarimeter that suppresses interaction noise as claimed in claim 1, is characterized in that: the first polarizationController (32), the second Polarization Controller (344), the 3rd Polarization Controller (347) be all optical fibre structure, will enter optical fiberThe flashlight of polarization state is specified in the output after controlling of the random polarization state optical signal of incident light; Described all optical fibre structure is by input lightFine (81), λ/4 fiber optic loop (82), the 2nd λ/2 fiber optic loop (83), the 3rd λ/4 fiber optic loop (84) and output optical fibre(85) the fiber optic loop structure of composition, or by input optical fibre (91), optical fiber squeezer (92), optic fibre turning device (93), defeatedGo out the extruding twisted fiber structure of optical fiber (94) composition.
3. the optical coherence polarimeter that suppresses interaction noise as claimed in claim 1, is characterized in that: described light pathDelay line (35) is a kind of transmission-type optical path delay device, and optical signal is from the first optics collimator (351) incident, through corner reflectionAfter device (352) reflection, from the second optics collimator (353) outgoing, otherwise or.
4. by the optical coherence polarimeter that suppresses interaction noise claimed in claim 1, it is characterized in that: described height is inclined to one sideConsisting of of the stability of shaking wide spectrum light source (1), wide spectrum light source (11) is by first output (13) of fiber coupler (12)To connect the first photodetector (14), and after fibre optic isolater (16), be connected in optical fiber by the second output (15) and riseDevice (17) partially.
5. by the optical coherence polarimeter that suppresses interaction noise claimed in claim 1, it is characterized in that: optical attenuator(37) insertion loss is chosen as the input tail optical fiber (331) of optical circulator (33) to the input tail optical fiber of light path correlator (34)(341), export tail optical fiber (332) with the input tail optical fiber (341) of light path correlator (34) to second of optical circulator (33)Insertion loss sum.
6. by the optical coherence polarimeter that suppresses interaction noise claimed in claim 1, it is characterized in that: light path demodulationDevice (3) forms the tail optical fiber of device, except the first Polarization Controller (32), is single-mode fiber.
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| CN105043718B (en) * | 2015-04-30 | 2017-11-21 | 哈尔滨工程大学 | A kind of Noise Suppression Device and suppressing method of the measurement of optical polarization device distributed polarization interference |
| CN106768877B (en) * | 2016-11-29 | 2018-10-26 | 哈尔滨工程大学 | A kind of Larger Dynamic range scaling method for optical coherence domain polarimeter |
| CN111238549B (en) * | 2020-01-14 | 2021-07-27 | 华东师范大学 | All-fiber interference method for inhibiting back scattering by utilizing polarization coding |
| CN111102994B (en) * | 2020-01-19 | 2021-08-20 | 枣庄学院 | Method for simultaneously measuring polarization coupling distribution of optical fiber ring and beat length of ring-wound optical fiber |
| CN112082734B (en) * | 2020-09-04 | 2022-06-21 | 哈尔滨工程大学 | Calibration method for Y waveguide reflection characteristic test |
| CN113299023B (en) * | 2021-05-21 | 2022-08-30 | 孙安 | Noise self-compensation distributed optical fiber anti-intrusion sensing array system and method |
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| CN103900799A (en) | 2014-07-02 |
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