CN103900799A - Optical coherence polarization measuring device capable of restraining interferential noises - Google Patents
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- CN103900799A CN103900799A CN201410120901.4A CN201410120901A CN103900799A CN 103900799 A CN103900799 A CN 103900799A CN 201410120901 A CN201410120901 A CN 201410120901A CN 103900799 A CN103900799 A CN 103900799A
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Abstract
The invention provides an optical coherence polarization measuring device capable of restraining interferential noises. The optical coherence polarization measuring device capable of restraining the interferential noises is composed of a high polarization stability broadband light source, an element to be detected, an optical path demodulator, a polarization crosstalk detector and a recording device. The optical path demodulator comprises a Faraday rotator for eliminating the optical interferential polarization fading effect and an optical circulator for detecting optical path difference, and polarization state controllers are arranged in front of the Faraday rotator and the optical circulator respectively. The polarization state of the transmitting light is adjusted to enable the polarization state of the input light to meet the minimum reflection condition under the Brewster angle, residue reflecting light signals in a device are reduced and eliminated, the optical interferential noises are restrained, and the polarization crosstalk measuring sensitivity is improved. The optical coherence polarization measuring device capable of restraining the interferential noises has the advantages of being high in measuring accuracy, wide in dynamic range, small in size, convenient to adjust, low in loss, and high in reliability, and can be applied to the optical performance quantitative test to high extinction ratio integration waveguide over 80 db and optical polarization devices.
Description
Technical field
What the present invention relates to is a kind of optical fiber measurement device, specifically a kind of optical coherence polarimeter with optical interference noise suppressing function.
Background technology
Optical coherence territory polarimetry technology (OCDP) is a kind of high precision distributed polarization coupling measurement technology, it is based on wide spectrum optical principle of interference, carry out optical path compensation by scan-type optical interdferometer, realize the interference between different polarization pattern, can carry out high-precision measurement and analysis to the locus of polarization interference, polarization coupled signal intensity, and then obtain the important parameter such as extinction ratio, bat length of optical polarization device.OCDP technology, as a kind of detection method of very promising distributed optical polarization performance, 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: polarization time domain reflection technology (POTDR), optical frequency domain reflection technology (OFDR), light coherent field reflection technology (OCDR) distributed detection method are compared with technology, and that OCDP technology has is simple in structure, high spatial resolution (5～10cm), wide-measuring range (measuring several kilometers of length), super high measurement sensitivity (coupling energy-80～-100dB), super big dynamic range (10
8～10
10) etc. advantage, be hopeful very much to develop into a kind of high precision, universal test technology and system.Because it the most directly and has truly described the transport behavior of flashlight in optic fibre light path, thus be particularly suitable for optical fibre device, assembly, and high precision, the superhigh precision interference-type optical fiber sensing light path such as optical fibre gyro are tested and are assessed.
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 Patent4893931] the OCDP system based on white light interference principle 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.Photonetics company of France has developed WIN-P125 and two kinds of model OCDP test macros of WIN-P400 according to this patented technology, is mainly used in shorter (500m) and grows the polarization characteristic analysis of (1600m) polarization maintaining optical fibre.Its main performance is polarization interference sensitivity for-70dB, dynamic range are 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 disclose a kind of detection method and pick-up unit (Chinese Patent Application No.: 201110052231.3) 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 measurement of the multiple optical polarization devices such as polarization maintaining optical fibre, polarization-maintaining fiber coupler, polarizer.Compared with the people's such as Herve Lefevre scheme, technical feature and index are close.
The same year, the people such as the Yao Xiaotian of AM General photoelectricity company (General Photonics Corporation) disclose a kind of full optical measuring system (US20110277552 for polarization maintaining optical fibre and the measurement of optical birefringence material distributed polarization interference, Measuring Distributed Polarization Crosstalk in Polarization Maintaining Fiber and Optical Birefringent Material), 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.
2012, applicant of the present invention has proposed the polarization crosstalk proving installation (Chinese Patent Application No.: CN201210379406.6) based on full optical fiber optical optical road and has improved the method (Chinese Patent Application No.: CN201210379407.0) of optical device polarization crosstalk measurement performance, the technical scheme that adopts full optical fiber optical optical road and suppress to clap noise, greatly suppress noise amplitude, the sensitivity of polarization crosstalk measurement is brought up to-more than 95dB, dynamic range can correspondingly remain on 95dB simultaneously, and reduced the volume of test macro, increase Measurement sensibility.
Along with the development of optical coherence polarimetry technology, detection sensitivity constantly improves, during from-march toward gradually-100dB of 95dB, the interference of light peak that the spurious reflections signal producing in optical path and main interference flashlight produce will become the optical noise that has a strong impact on measurement.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, as Faraday polarization apparatus, formed by the element of multiple difference in functionalitys such as tail optical fiber, collimating apparatus, polarization apparatus, catoptron, at the interface of optical reflection, have the very faint reflected light signal of intensity and produce, the amplitude size of its reflected signal is described with return loss characteristic.For optic communication device, General Requirements return loss is controlled at-below 55dB, just can ignore its impact; And for optical coherence polarimetry technology, compare the detection sensitivity of-90～-100dB, above-mentioned return loss is wanted large 3～4 orders of magnitude, can not ignore completely.If particularly its transmission direction of multiple reflections parasitic light signal is identical with main interference light, cannot be eliminated by the general method such as optically filtering and cut-off; They are discrete with reference light on light path, and amplitude is only greater than the detection sensitivity of system, within optical path difference drops on light path sweep limit, just can exert an influence.Therefore,, in optical coherence polarimetry light path, the parasitic light 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 can realize in the optical path remaining elimination of reflected light signal of device and the inhibition of optical interference noise, improve polarization crosstalk and measure 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 degree of stability wide spectrum light source 1, light path demodulating equipment 3, polarization crosstalk detect and pen recorder 4;
1) described light path demodulating equipment is made up of analyzer 31, the first Polarization Controller 32, optical circulator 33, Michelson type light path correlator 34, optical attenuator 37, interference signal differential detector 36, the first Polarization Controller 32, by controlling the polarization state of transmission light in tail optical fiber 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 Polarization Controller 344, the 3rd Polarization Controller 347, the first faraday polariscope 345 and the second Faraday mirror 348 form, the second Polarization Controller 344 is controlled the polarization state of transmission light in the fixed arm 343 of light path correlator 34, suppress the residual light reflection 58B of the first faraday polariscope 345, the 3rd Polarization Controller 347 is controlled the polarization state of transmission light in dry light path correlator 34 scan arms 346, suppress the residual light reflection 58B of the second Faraday mirror 348,
3) interference signal differential detector 36 is connected to input end 341, the output terminal 349 of light path correlator 34 by circulator 33 and optical attenuator 37, for surveying interference signal.
The first faraday polariscope 345 is made up of the first input optical fibre 51, the 3rd optical collimator 52, the first gyrotropi crystal 53, the first magnet ring 54, the first catoptron 55, for the flashlight reflection at light path correlator 34 fixed arms 343 by transmission, and by polarization state half-twist; The second Faraday mirror 348 is made up of the second input optical fibre 61, the 4th optical collimator 62, the second gyrotropi crystal 63, the second magnet ring 64, the second catoptron 65, for the flashlight reflection at light path correlator 34 scan arm fixed arms 346 by transmission, 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 point of discontinuity; Its function is to enter the random polarization state light signal of incident light of optical fiber, can export the flashlight of appointment polarization state after controlling; Can adopt fiber optic loop structure, it is made up of input optical fibre 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; Or adopt extruding twisted fiber structure, it is made up of input optical fibre 91, optical fiber squeezer 92, optic fibre turning device 93, output optical fibre 94.
Described optical path delay line 35 is a kind of transmission-type optical path delay devices, and light signal can be from the first optics collimator 351 incidents, and after corner reflector 352 reflections, from the second optics collimator 352 outgoing, vice versa.
The wide spectrum light source 11 of described high polarization degree of stability wide spectrum light source 1 will connect the first photodetector 14 by the first output terminal 13 of fiber coupler 12; After fibre optic isolater 16, be connected in the optical fiber polarizer 17 by the second output terminal 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 341 of light path correlator 34, with the insertion loss sum of tail optical fiber 341 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 interference polarization decay effect, light path demodulating equipment adopts the Michelson light path correlator with Faraday polarization apparatus, has adopted the light path difference detecting structure with optical circulator in order to improve the dynamic range of measurement.But the introducing of above-mentioned optical fibre device, has increased the optics point of discontinuity in optical path too, increase the probability that produces spurious reflections signal, cause the deteriorated of optical interference noise.
The optical coherence polarimeter that the present invention proposes suppresses optical interference noise core concept: by suppressing the spurious reflections signal of fiber optic component and optic fibre light path generation, reduce quantity and the amplitude at its white light interference peak, reach the object that suppresses optical noise.As shown in Figure 2, as a branch of incident light 56(or 66) incide two media n
1and n
2interface 73 time, can occur reflection and refraction effect, there is reflected light 56A(or 66A) and refract light 57(or 67); From Fresnel formula, in the time that input angle 72 is certain specific angle (being Brewster angle), reflected light 56A(or 66A) will only comprise the linearly polarized light that direction of vibration is vertical with the plane of incidence, Brewster angle θ can be expressed as
If now adjust input light 56(or 66) polarization state, as shown in Figure 3, make it only have the direction of vibration that is parallel to the plane of incidence, reflected light 56A(or 66A) by suppressed, even disappear, incident light 56(or 66) whole in refract light 57(or 67) outgoing.
In order to reduce and eliminate the remaining reflected light of Faraday polarization apparatus and optical circulator in optical path, can before device, place polarization state controller, by transmission polarized state of light is regulated, make to input polarisation of light state and meet the condition that direction of vibration under Brewster angle is parallel to the plane of incidence, come amplitude and the quantity of remaining reflected signal light in suppression device, the return loss that makes device from-55～-60dB bring up to-more than 80dB, realize the inhibition of the interaction noise of white light interferometric, reach the object that improves polarization crosstalk measurement 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 optical device, can not change on the one hand light channel structure and the parameter of light path demodulating equipment, can keep all advantages of former optical path, can not introduce on the other hand new optical noise, have that control method is easy, noise suppression effect good, loss is low, high reliability yet;
(2) the light path demodulating equipment of employing Faraday polarization apparatus, has overcome the polarization decay effect in optical interference, improves environmental suitability and the reliability measured;
(3) adopt differential optical sniffer to interference signal demodulation, increased the signal to noise ratio (S/N ratio) that polarization crosstalk is measured, expanded the dynamic range of measuring;
(5) adopt full optical fiber optical optical road, have that volume is little, measuring accuracy is high, an advantage such as temperature stability and anti-vibration good stability, reduced the requirement of measurement mechanism to environment.
Accompanying drawing explanation
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 incident angle, is parallel to the transmitted light path schematic diagram of the polarized 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 inner structure of Faraday polarization apparatus and the light path schematic diagram that remaining reflected light produces;
Fig. 7 is the process schematic diagram that the remaining reflected light of Faraday polarization apparatus produces interferometric optical noise;
Fig. 8 is the polarization crosstalk measurement result figure with the optical interference noise of remaining reflected light generation;
Fig. 9 is in the time of Brewster incident angle, is parallel to the polarized light of the plane of incidence at the transmission index path of Faraday polarization apparatus inside;
Figure 10 eliminates after the remaining reflected light of Faraday polarization apparatus 348, suppresses the optical principle schematic diagram that interaction noise produces;
Figure 11 is the polarization crosstalk measurement result figure eliminating after the interaction noise of Faraday polarization apparatus 348 in light path correlator scan arm;
Figure 12 is the polarization crosstalk measurement result figure eliminating after the interaction noise of Faraday polarization apparatus 345 in light path correlator fixed arm.
Embodiment
For the optical coherence polarimeter of the optical noise inhibition that clearly explanation the present invention relates to, the invention will be further described with accompanying drawing in conjunction with the embodiments, 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, fiber power is greater than 2mW, be approximately-60dB of light source light spectrum ripple <0.05dB(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, and insertion loss is 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 light path scanner 352(reflectivity are more than 92%) between light path scanning distance between 0～200mm, change greatly, average insertion loss is 2.0dB, in loss fluctuation ± 0.2dB, and light path scanner 352 is approximately in the time of 100mm position, and the fixed arm 343 of Michelson type light path correlator 34 and the optical path difference of scan arm 346 are 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) photochromics of first, second differential detector 361 and 362 is InGaAs, and photodetection scope is 1100～1700nm, and 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, and its structure 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, and the fast axle of waveguide tail optical fiber is aimed at the fast axle of waveguide chip, waveguide chip length 30mm.
The course of work of measurement mechanism is as follows:
The output light of wide spectrum light source 11 becomes line polarisation after light splitting, the isolation of fibre optic isolater 16 and the polarization of the polarizer 17 of fiber coupler 12, 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 again, luminous energy is injected in the fast and slow axis of waveguide chip 2D to be measured equably, light signal is divided into two bundles, transmits respectively in 2B and 2C; 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 in the fixed arm 343 being made up of the second polarization state controller 344 and the first Faraday polarization apparatus 345, and a branch of transmission is in the scan arm 346 being made up of first collimator 351, corner reflector 352, the second optics collimator 352, the 3rd Polarization Controller 347, the second Faraday mirror 348 in addition.In the time that 310 motions of light path scanner realize light path scanning, when the optical path difference producing between the fixed arm of light path correlator 34 and scan arm matches from the signal transmission with different optical path differences to be measured, interference signal differential detector 36 will be exported white light interference signal.Its interference peak is directly proportional to the amplitude of light signal to be measured, and the light path scanning position that its peak value is corresponding is directly proportional to the light path for the treatment of sidelight signal.
As shown in Figure 6, when transmission will enter respectively first, second Faraday polarization apparatus 345 and 347 in flashlight 56 and the transmission of fixed arm 343 at the flashlight 66 of scan arm 346.Take the second GRIN Lens 52 as example, generally on the interface 52B of the second GRIN Lens 52 and air, flashlight 56 can produce faint Fresnel reflection light 56A, light signal is after polarization apparatus 53 transmissions and catoptron 55 reflections, during again through interface 52B, can produce same faint Fresnel reflection light 58B.Remaining reflected light 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 reflected light 66A, the 68B identical with the transmission direction of flashlight 69.
As shown in Figure 7, the middle two-beam (transmission light 59 and remaining reflected light 58B) of scan arm 346 and the two-beam (transmission light 69 and remaining reflected light 68B) of fixed arm 343 produce the process schematic diagram of white light interference peak value: 1) in the time that remaining reflected light 58B and transmission light 69 light path occurs mate, to produce interference peak 73, its amplitude is directly proportional to the light intensity of remaining reflected light 58B; 2) in the time that transmission light 59 and transmission light 69 light path occurs mate, will produce interference peak 71, its amplitude is directly proportional to the light intensity of transmission light 59 and 69, and the difference of interference peak 73 and 71 scanning optical path lengths is the optical path difference of remaining reflected light 58B and transmission light 59; 3) in the time that transmission light 59 mates with remaining reflected light 68B generation light path, will produce interference peak 74, its amplitude is directly proportional to the light intensity of remaining reflected light 68B, and the difference of interference peak 74 and 71 scanning optical path lengths is the optical path difference of remaining reflected light 68B and transmission light 69.The optical interference noise measurement curve that Fig. 8 obtains for measurement, in figure, peak value 73 and 74 is respectively the interference peak that remaining reflected light 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 reflected light 56A, 58B and 66A, 68B be greatly suppressed disappearance even, as shown in Figure 9.To regulate the 3rd Polarization Controller 347 as example, can make remaining reflected light 56A and 58B disappear.The white light interference peak value that now transmission light 59 of scan arm 346 and the transmission light 69 of fixed arm 343 and remaining reflected light 68B produce, as shown in figure 10, interference peak 73 will disappear.By controlling the state of the 3rd Polarization Controller 347, can suppress the optical interference noise of Faraday polarization apparatus 348, its measured result is 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 the validity that this device suppresses interaction noise.
In like manner, by controlling the state of the 3rd Polarization Controller 344, can suppress the optical interference noise of Faraday polarization apparatus 345, its measured result as shown in figure 12, as shown in Figure 12, reflection peak 74, from-drop to-80dB of 58dB, lower than the Noise Background of measurement mechanism, has further been verified the validity that this device suppresses interaction noise.
Claims (7)
1. can suppress an optical coherence polarimeter for interaction noise, comprise that high polarization degree of stability wide spectrum light source (1), light path demodulating equipment (3), polarization crosstalk detect and pen recorder (4), is characterized in that:
1) described light path demodulating equipment is connected to form by analyzer (31), the first Polarization Controller (32), optical circulator (33), Michelson type light path correlator (34), optical attenuator (37), interference signal differential detector (36), and the first Polarization Controller (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) is 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 mirror (348) composition, in the fixed arm (343) of the second Polarization Controller (344) control light path correlator (34), the polarization state of transmission light suppresses the residual light reflection (58B) of the first faraday polariscope (345), the polarization state of transmission light in dry light path correlator (34) scan arm (346) of controlling the 3rd Polarization Controller (347) suppresses the residual light reflection (58B) of the second Faraday mirror (348),
3) interference signal differential detector (36) is connected to input (341), the output terminal (349) of light path correlator (34) by circulator (33) and optical attenuator (37), for surveying interference signal.
2. the optical coherence polarimeter that suppresses interaction noise as claimed in claim 1, it is characterized in that: the first faraday polariscope (345) is made up of the first input optical fibre (51), the 3rd optical collimator (52), the first gyrotropi crystal (53), the first magnet ring (54), the first catoptron (55), for transmitting the flashlight reflection at light path correlator (34) fixed arm (343), and by polarization state half-twist; The second Faraday mirror (348) is made up of the second input optical fibre (61), the 4th optical collimator (62), the second gyrotropi crystal (63), the second magnet ring (64), the second catoptron (65), for transmitting the flashlight reflection at light path correlator (34) scan arm fixed arm (346), and by polarization state half-twist.
3. the optical coherence polarimeter that suppresses interaction noise as claimed in claim 1, it is characterized in that: the first Polarization Controller (32), the second Polarization Controller (344), the 3rd Polarization Controller (347) are all optical fibre structure, the random polarization state light signal of the incident light that enters optical fiber is exported to the flashlight of specifying polarization state after controlling; The fiber optic loop structure that described all optical fibre structure is made up of input optical fibre (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), or the extruding twisted fiber structure being formed by input optical fibre (91), optical fiber squeezer (92), optic fibre turning device (93), output optical fibre (94).
4. the optical coherence polarimeter that suppresses interaction noise as claimed in claim 1, it is characterized in that: described optical path delay line (35) is a kind of transmission-type optical path delay device, light signal is from the first optics collimator (351) incident, after corner reflector (352) reflection, from the second optics collimator (352) outgoing, otherwise or.
5. by the optical coherence polarimeter that suppresses interaction noise claimed in claim 1, it is characterized in that: the consisting of of described high polarization degree of stability wide spectrum light source (1), wide spectrum light source (11) will connect the first photodetector (14) by first output terminal (13) of fiber coupler (12), be connected in the optical fiber polarizer (17) by the second output terminal (15) after fibre optic isolater (16).
6. by the optical coherence polarimeter that suppresses interaction noise claimed in claim 1, it is characterized in that: the insertion loss of optical attenuator (37) is chosen as the input tail optical fiber (331) of optical circulator (33) to the input tail optical fiber (341) of light path correlator (34), with the insertion loss sum of tail optical fiber (341) to the second output tail optical fiber (332) of optical circulator (33).
7. by the optical coherence polarimeter that suppresses interaction noise claimed in claim 1, it is characterized in that: light path demodulating equipment (3) forms the tail optical fiber of device, except the first Polarization Controller (32), is single-mode fiber.
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| CN111102994A (en) * | 2020-01-19 | 2020-05-05 | 枣庄学院 | Method for simultaneously measuring polarization coupling distribution of optical fiber ring and beat length of ring-wound optical fiber |
| CN111238549A (en) * | 2020-01-14 | 2020-06-05 | 华东师范大学 | All-fiber interference method and device for inhibiting back scattering by utilizing polarization coding |
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