CN1831572A - Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application - Google Patents
Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application Download PDFInfo
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Abstract
A method for setting axle of polarization shaft on polarization preserving fiber based on side view light intensity distribution includes regulating distance between said fiber and objective to let light intensity distribution present nine characteristic points, rotating said fiber to obtain light intensity characteristic amounts at different position angle and to obtain measurement curve of angle variation in following to light intensity characteristic amounts, making cross - correlation of measurement curve with standard curve and using angle corresponding to maximum value of cross - correlation as position angle of said fiber.
Description
Technical field
The present invention relates to a kind of high precision dead axle method and application thereof of the polarization maintaining optical fibre polarization axle based on five-finger type side-looking light distribution.
Background technology
Polarization maintaining optical fibre be owing to can be implemented in the maintenance of the specific polarization state of transmitting in the optical fiber, thereby in fields such as interferometric optical fiber sensor making, coherent fiber communication and fibre optic gyroscopes important use arranged.Why polarization maintaining optical fibre can keep the polarization characteristic of the specific polarized light that transmits in its fibre core constant, and method commonly used is that the fibre core that designs this type optical fiber artificially is subjected to asymmetric stress, makes and form stress birefrin in fibre core.Usually the method that realizes this design is on polarization maintaining optical fibre and xsect different stress distribution zones, routine panda optic fibre or elliptical clad fiber to be set.On the xsect of this class polarization maintaining optical fibre, the direction of stress value maximum and minimum direction are commonly referred to the direction of two polarization axles, and the direction of stress value maximum often is called slow-axis direction, and the direction of stress value minimum often is called quick shaft direction, these two also are referred to as polarization axle, or are referred to as birefringence axis.The dimensional orientation of these two polarization axles is relevant in the position of polarization maintaining optical fibre xsect with the stressed zone.Usually it is vertical mutually to design and be made into these two polarization axles.
In the application of polarization maintaining optical fibre, particularly making the polarization maintaining optical fibre device---as polarization-maintaining fiber coupler, polarization-maintaining fiber polarizer, polarization maintaining optical fibre connector, polarization maintaining optical fibre polarization beam apparatus etc., and when two polarization maintaining optical fibres of welding, want to have made full use of the polarization characteristic of the specific polarized light that transmits in its maintenance fibre core, the technology of a key is exactly to want accurately to determine these two polarization axles of polarization maintaining optical fibre.
The axis fixation method of the polarization axle of existing definite polarization maintaining optical fibre mainly contains side elevation image dead axle method, and it is with degree of precision, simple and feasible characteristics, thereby is applicable to that various types of optical fiber has using value most.Select for use the different characteristic image of side elevation image just to constitute different axis fixation methods with eigenwert.
U.S. Pat 005758000A discloses the POL method, belong to a kind of of side elevation image dead axle method recited above, the shape characteristic of its selected light distribution is that the maximum control value h (difference of light intensity maximal value and minimum value) of light distribution is positioned at the fiber optic hub position.When optical fiber rotated (azimuthal variation), light distribution was also along with change.Utilize control value h as eigenwert, record the curve that h changes with angle, and utilize the symmetry of this curve and periodically carrying out Fourier expansion obtains the typical curve of initial angle for zero degree.Subsequently that the arbitrary orientation angle is initial measurement curve and typical curve are done simple crosscorrelation, and the pairing angle of maximum value is azimuthal value of the polarization axle of asking, but this method is subject to the measuring accuracy of h.
European patent EP 0319041B1 also belongs to side elevation image dead axle method, this patent disclosure with the pattern middle body of light distribution several zones (not being unique point) be characteristic quantity, shape clearly demarcated by central portion, the dark space is determined the position angle of polarization axle.Because the light and shade district can not accurately judge in image, has limited the high precision dead axle.
Chinese patent CN1131279 also belongs to side elevation image dead axle method, this patent disclosure following method, when light side direction irradiation polarization maintaining optical fibre, three crests with side-looking light distribution pattern central authorities are characteristic area, get spacing a, b between three crests in first polarization maintaining optical fibre light distribution pattern as characteristic quantity, in like manner get in the light distribution pattern of second polarization maintaining optical fibre spacing c, d between three crests as characteristic quantity, as a: b=c: during d, determine that the polarization axle position angle of two optical fiber is identical.This patent is applicable in the optical fiber splicer carries out welding to two polarization maintaining optical fibres, but is not suitable for the concrete position angle of the polarization axle of determining every polarization maintaining optical fibre.
U.S. Pat 2002166953 also belongs to side elevation image dead axle method, this patent disclosure following method, during illuminating ray side direction irradiation polarization maintaining optical fibre, transmission is crossed in the side-looking light distribution of polarization maintaining optical fibre two crests, the position angle of determining polarization axle as characteristic quantity with the height and the position of these two crests.This method has been ignored among the patent US005758000A h to the contribution of measuring accuracy.
People such as Wang Jine also are based on side elevation image (" based on the matching type polarization-preserving fiber axis fixing new method of 5 eigenwerts ", " optical communication technique ", 2005, the first phase, 20～22), with the light distribution pattern middle body that is similar to " mountain type " several as characteristic quantity, 5 method of characteristic have been proposed.5 eigenwert ratio juris are the extraction difference of eigenwert with the difference of patent US005758000A.5 method of characteristic are that the data sum of getting first crest, first trough and second crest deducts the poor of second trough and the 3rd crest, and the value that obtains is as characteristic quantity.The characteristic quantity of the method utilization is compared with patent US005758000A with the azimuthal variation of polarization axle, its characteristic quantity is more obvious with the variation of angle, be easy to realize the location of polarization principal axis, improved measuring accuracy to a certain extent, but precision is subject to value poor at two bright peaks.
These patents and method have realized the polarization maintaining optical fibre polarization axle dead axle of degree of precision to a certain extent.Yet the dead axle precision of these methods still can not meet the demands in the special applications of some polarization maintaining optical fibre.For example, when making polarization-maintaining fiber coupler or polarization-maintaining fiber polarizer, near the dead axle precision of the position angle of polarization axle 0 ° (or 90 °) determining final performance of device and quality, less than 0.5 ° can be controlled at crosstalking effectively-41dB axis error.The dead axle accuracy limitations of existing these axis fixation methods the performance of these devices and the further raising of quality.
Summary of the invention
Can not satisfy the problem that the polarization maintaining optical fibre element manufacturing requires in order to solve the precision that exists in the prior art polarization maintaining optical fibre polarization axle dead axle, primary and foremost purpose of the present invention is to provide a kind of polarization maintaining optical fibre high precision dead axle method based on the side-looking light distribution, the light distribution pattern curve of the described side elevation image of this method presents the distribution of " five-finger type ", be called " the five-finger type curve of light distribution ", there are five crests, four troughs in described " the five-finger type curve of light distribution " central authorities, have nine unique points.Near the dead axle precision of this axis fixation method 0 ° or 90 ° of positions can reach 0.1 ° in theory, in experiment, can be better than 0.5 °, when particularly suitable is made polarization-maintaining fiber coupler and polarization-maintaining fiber polarizer, the high precision dead axle of polarization principal axis when 0 ° or 90 ° of position angles.
Another object of the present invention is to provide the Application for Field such as making of above-mentioned axis fixation method polarization-maintaining fiber coupler and polarization-maintaining fiber polarizer, polarization maintaining optical fibre welding, optical fibre gyro.
Purpose of the present invention is achieved through the following technical solutions: a kind of polarization-preserving fiber axis fixing method based on the side-looking light distribution comprises the steps:
(1) the dead axle polarization maintaining optical fibre is treated in the irradiation of incoherent directional light side direction, is made on the plane of vision of microcobjective and form a measurable light distribution that described light distribution images on the video camera through microcobjective.
(2) adjust distance between polarization maintaining optical fibre and the object lens, make the pattern curve of light distribution present the distribution of " five-finger type ", be called " the five-finger type curve of light distribution ".
(3) rotation polarization maintaining optical fibre obtains a series ofly along with polarization maintaining optical fibre is positioned at the azimuthal light intensity characteristic amount of different polarization axle, and draws the measurement curve of light intensity characteristic amount with the polarization axle azimuthal variation.
(4) obtain typical curve through handling.
(5) will measure curve and typical curve is done simple crosscorrelation, the pairing angle of the maximum value of simple crosscorrelation is the residing position angle of polarization maintaining optical fibre.
There are five crests and four troughs in described " the five-finger type curve of light distribution " central authorities, have nine unique points.Described " the five-finger type curve of light distribution " rises from left to right, and unique point is followed successively by first crest, first trough, second crest, second trough, the 3rd crest, the 3rd trough, the 4th crest, the 4th trough and the 5th crest.The data sum of first crest value of described unique point, first trough value, second crest value, second trough value, the 3rd crest value deducts the data sum of the 3rd trough value, the 4th crest value, the 4th trough value, the 5th crest value, and resulting difference is the light intensity characteristic amount.Described light intensity characteristic amount is corresponding one by one with the position angle of polarization maintaining optical fibre polarization axle.
Described typical curve obtains as follows: carry out simulation calculation with the Ray-tracing Method programming, calculate on the inspection surface light distribution pattern that presents " five-finger type ", and simulation calculation goes out the light intensity characteristic amount of polarization maintaining optical fibre different orientations, and draws the typical curve of theoretical light intensity characteristic quantity with the polarization axle azimuthal variation; Perhaps in experiment, record light intensity characteristic amount (the light intensity characteristic amount here is through calculating by nine unique points on " five-finger type " curve of light distribution) with the curve of polarization axle azimuthal variation and utilize its symmetry and periodicity to carry out Fourier expansion and obtain the typical curve of initial angle for zero degree (polarization maintaining optical fibre slow axis parallel time be defined as 0 °) in the same way with incident light.
The rotation polarization maintaining optical fibre adopts two stepper motors to rotate synchronously in the described step (3).The precision of the angle of described rotation polarization maintaining optical fibre reaches more than 0.1 °.Described video camera is CCD (electric charge coupling) video camera, and image pixel resolution is more than the 0.5 μ m/ pixel.
The polarization-preserving fiber axis fixing method that the present invention is based on the side-looking light distribution can be applicable to the fields such as making of polarization-maintaining fiber coupler and polarization-maintaining fiber polarizer, polarization maintaining optical fibre welding, optical fibre gyro.
Polarization maintaining optical fibre high precision dead axle method based on the side-looking light distribution of the present invention (being five-finger type light distribution eigenwert determining method) mainly is applicable near the situation that (in ± 10 ° of scopes) have high requirements to the dead axle precision 0 ° or 90 ° (definition polarization maintaining optical fibre slow axis just is with the counter clockwise direction rotation angle of directional light), usually when making polarization-maintaining fiber coupler and polarization-maintaining fiber polarizer, there are this requirement, the present invention to can be applicable to make the welding, optical fibre gyro etc. of polarization-maintaining fiber coupler, polarization-maintaining fiber polarizer, polarization maintaining optical fibre.
The ultimate principle of side elevation image dead axle method: the polarization maintaining optical fibre that will treat dead axle laterally places under the object lens of optical microscope, when the incoherent directional light side direction that penetrates from light source shines polarization maintaining optical fibre, polarization maintaining optical fibre is because the refractive index difference of two stressed zones, fibre core, covering, make polarization maintaining optical fibre to the similar cylindrical lens of incident directional light, make on the distance fiber optic hub is the inspection surface (front focal plane of object lens just) of L, to have formed a measurable curve of light distribution that comprises polarization maintaining optical fibre polarization axle locus.The curve of light distribution is relevant with the attitude of polarization axle on the polarization maintaining optical fibre xsect, and just the curve of light distribution is relevant with the attitude of polarization axle.When the pattern of having determined the curve of light distribution, again to extracting characteristic quantity on the curve of light distribution of having determined, with this characteristic quantity as with the corresponding variable in polarization maintaining optical fibre polarization axle position angle, characteristic quantity that obtains and the characteristic quantity that the prior determined polarization axle of Theoretical Calculation is positioned at the specific dimensional orientation angle are contrasted, just can determine the value of the pairing attitude of polarization axle of polarization maintaining optical fibre this moment, realize accurate dead axle.This method realizes that the key of high precision dead axle is exactly the choosing of shape characteristic and the determining of shape characteristic value of the curve of light distribution.Shape characteristic and the eigenwert of choosing the different curves of light distribution just have different axis fixation methods, accessible separately dead axle precision difference, or to reach the needed dead axle time of dead axle precision be inequality.
The present invention compared with prior art has following advantage and beneficial effect:
Near 0 ° or 90 ° (definition polarization maintaining optical fibre slow axis with the counter clockwise direction rotation angle of directional light for just) (in ± 10 ° of scopes), the light distribution pattern curve of side elevation image of the present invention presents the distribution of " five-finger type ", there are five crests, four troughs in central authorities, have nine unique points.The present invention compares with the POL method with 5 method of characteristic, the eigenwert variable quantity of five-finger type light distribution eigenwert determining method is all bigger than the eigenwert variable quantity of 5 method of characteristic, POL method, and the eigenvalue graph of five-finger type light distribution eigenwert determining method is more obvious with the variation of angle, more precipitous.In addition, near 0 ° or 90 °, five-finger type light distribution eigenwert determining method will make azimuthal measurement sensitivity obtain to improve greatly, when making polarization-maintaining fiber coupler or polarization-maintaining fiber polarizer, near 0 ° or 90 ° dead axle there is higher requirement, near the theoretical dead axle precision of this method 0 ° or 90 ° can reach 0.1 °, experimentally is better than 0.5 °.
Description of drawings
Fig. 1 is a side elevation image dead axle method synoptic diagram.
Fig. 2 is an experimental provision synoptic diagram of the present invention.
Fig. 3 a is " the five-finger type curve of light distribution " of the present invention figure; Fig. 3 b is the pairing polarization maintaining optical fibre cross-section location of Fig. 3 a figure.
Fig. 4 is the skeleton view of polarization maintaining optical fibre 11 of the present invention.
Fig. 5 Aa, Fig. 5 Ba are polarization maintaining optical fibre when being in different orientations, the different situations distribution plan of the five-finger type curve of light distribution; Fig. 5 Ab, Fig. 5 Bb are respectively Fig. 5 Aa, the pairing polarization maintaining optical fibre cross-section location of Fig. 5 Ba figure.
Fig. 6 is the eigenvalue graph form comparison diagram of near the POL method of (80 °～104 °) each corresponding angle 90 °, 5 method of characteristic and five-finger type light distribution method of characteristic.
Fig. 7 is near the light intensity characteristic value variable quantity curve comparison diagram of (87.75 °～92.25 °) POL method, 5 method of characteristic and five-finger type light distribution method of characteristic 90 °.
When the position angle that Fig. 8 calculates panda protecting polarized light fiber for simulation theory of the present invention is in 90 °, " five-finger type " curve of light distribution figure shown under the situation of the distance L of plane of vision and core centre=151.5 μ m.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples, but embodiments of the present invention are not limited thereto.
Embodiment
The present invention is based on the polarization maintaining optical fibre polarization axle axis fixation method of side-looking light distribution:
(1) as shown in Figure 1 (the 18th, polarization maintaining optical fibre polarization principal axis (slow axis)), incoherent source of parallel light 13 is sent incoherent directional light 14 side direction to shine and treated dead axle polarization maintaining optical fibre (panda type polarization-preserving fiber) at 11 o'clock, polarization maintaining optical fibre is because the refractive index difference of two stressed zones, fibre core, covering, make polarization maintaining optical fibre (as shown in Figure 4 to the similar cylindrical lens of incident directional light, 1a, 1c are two stressed zones, 1b is a fibre core, 1d is a covering), make on the distance fiber optic hub is the inspection surface 15 of L, to have formed a measurable curve of light distribution 16.This curve of light distribution figure has comprised the spatial positional information of polarization maintaining optical fibre polarization axle, and the ccd video camera 19 that is had an A/D translation function is noted.Adjust the plane of vision 15 of microcobjective 12, then the pattern of the light distribution of ccd video camera 19 records can change.Adjustment generally speaking, the pattern of the light distribution 16 of record are " mountain " type and distribute.
(2) polarization maintaining optical fibre is placed as shown in Figure 2.The two ends of polarization maintaining optical fibre are fixed to clamp by two anchor clamps 23, and the rear side of two anchor clamps 23 all has 21, two stepper motors 21 of stepper motor and is fixed on the lifting table 22.By adjusting lifting table 22, treat distance between dead axle polarization maintaining optical fibre 11 and the object lens 12 to reach careful adjustment, thereby realize the position of the plane of vision 15 of careful adjusting microcobjective 12, when regulating among Fig. 1 the distance L of inspection surface and polarization maintaining optical fibre fibre core and be 150 μ m～152 μ m, the light distribution 16 of record can occur and different generally speaking patterns on ccd video camera 19, as shown in Figure 3, the pattern curve of the side direction light distribution of the polarization maintaining optical fibre of this record presents the distribution of " five-finger type ", is called " the five-finger type curve of light distribution ".
(3) shown in Fig. 3 a, there are five crests, four troughs in " the five-finger type curve of light distribution " central authorities, have nine unique points, from a left side, first crest called after unique point 1, first trough called after unique point 2, second crest called after unique point 3, second trough called after unique point 4, the 3rd crest called after unique point 5, the 3rd trough called after unique point 6, the 4th crest called after unique point 7, the 4th trough called after unique point 8, the 5th crest called after unique point 9.Fig. 3 b is the pairing polarization maintaining optical fibre cross-section location of Fig. 3 a figure, and dotted line is a slow axis, and the angle theta of it and directional light is exactly the position angle 17 (polarization maintaining optical fibre slow axis with the counterclockwise angle of directional light for just) of polarization maintaining optical fibre polarization axle this moment.
(4) place in the panda type polarization-preserving fiber orientation as shown in Figure 2 that the axial length undetermined company that flies is produced, this moment, the two ends of panda type polarization-preserving fiber were fixed to clamp by two anchor clamps 23, the rear side of two anchor clamps 23 all has 21, two stepper motors 21 of stepper motor and is fixed on the lifting table 22.Reach the distance of adjusting between polarization maintaining optical fibre and the object lens by the height of regulating lifting table, make plane of vision present " five-finger type " light distribution, ccd video camera will be noted the five-finger type curve of light distribution 16 of polarization maintaining optical fibre 11 this moment.According to the curve of light distribution of noting 16, the data sum of first crest value 1 of unique point, first trough value 2, second crest value 3, second trough value 4, the 3rd crest value 5 is deducted the data sum of the 3rd trough value 6, the 4th crest value 7, the 4th trough value 8, the 5th crest value 9, resulting difference is as characteristic quantity (characteristic quantity is the light intensity characteristic value), with this characteristic quantity as with the corresponding variable in panda type polarization-preserving fiber polarization axle position angle, the corresponding characteristic quantity in each polarization axle position angle of polarization maintaining optical fibre.
(5) rotate panda type polarization-preserving fiber 11 synchronously with two stepper motors 21, obtain a series of characteristic quantities that are positioned near different orientations (0 ° or 90 ° ± 10 ° of scopes) along with polarization maintaining optical fibre, draw the curve of characteristic quantity thus with the polarization axle azimuthal variation, this curve is for measuring curve, shown in the five-finger type image feature value curve map among Fig. 6.
(6) adopt Ray-tracing Method emulation directional light by behind the panda type polarization-preserving fiber 11, can calculate the light intensity distributions that arbitrary vertical plane (inspection surface) is located in the light ray propagation process.Programme and carry out simulation calculation with Ray-tracing Method, when the distance (L among Fig. 1) of setting inspection surface and panda type polarization-preserving fiber fibre core is 150 μ m～152 μ m, calculate on the inspection surface light distribution pattern that presents " five-finger type ", as shown in Figure 8, confirmed the existence of " five-finger type " light distribution pattern of gained in the experiment in theory.Identical with the disposal route of experiment, the data sum of getting first crest value of unique point, first trough value, second crest value, second trough value, the 3rd crest value deducts the data sum of the 3rd trough value, the 4th crest value, the 4th trough value, the 5th crest value, resulting difference is as characteristic quantity, with this characteristic quantity as with the corresponding variable in polarization maintaining optical fibre position angle.Simulation calculation goes out the characteristic quantity of panda type polarization-preserving fiber different orientations, draws thus that characteristic quantity is with the curve of polarization axle azimuthal variation in theory, and this curve is as typical curve.
(7) will measure curve and typical curve is done simple crosscorrelation, the pairing angle of the maximum value of simple crosscorrelation is the residing azimuth angle theta of polarization maintaining optical fibre polarization axle.
Fig. 5 Aa, Fig. 5 Ba are near polarization maintaining optical fibre is in 90 ° during different orientations, the different situations distribution plan of the five-finger type curve of light distribution; Fig. 5 Ab, Fig. 5 Bb are respectively Fig. 5 Aa, the pairing polarization maintaining optical fibre cross-section location of Fig. 5 Ba figure.Fig. 5 Aa be polarization maintaining optical fibre be in 90 ° (this moment polarization maintaining optical fibre slow axis (main shaft) vertical with directional light, be that angle is 90 °) time, incoherent directional light is by the curve of light distribution shape characteristic of side elevation image that polarization maintaining optical fibre forms, and unique point 1, unique point 2 are symmetrical with unique point 8, unique point 9 in the curve map.Fig. 5 Ba is that polarization maintaining optical fibre slow axis and directional light angle are when being 89.5 °, incoherent directional light is by the curve of light distribution shape characteristic of side elevation image that polarization maintaining optical fibre forms, and unique point 1, unique point 2 obviously are asymmetric form with unique point 8, unique point 9 in this curve map.By the tracing pattern of Fig. 5 Aa, two figure of Fig. 5 Ba as can be seen, when the polarization axle position angle of polarization maintaining optical fibre changed 0.5 °, variation clearly took place in the eigenwert of unique point 1, unique point 2, unique point 8,9 four points of unique point, but the dead axle precision.
When the position angle that Fig. 8 calculates panda protecting polarized light fiber for simulation theory is in 90 °, " five-finger type " curve of light distribution figure shown under the situation of the distance L of plane of vision and core centre=151.5 μ m.Confirmed the existence of " five-finger type " light distribution pattern of gained in the experiment in theory.
As shown in Figure 2, the two ends of polarization maintaining optical fibre are fixed to clamp by two anchor clamps 23, and the rear side of two anchor clamps 23 all has 21, two stepper motors 21 of stepper motor and is fixed on the lifting table 22.Incoherent source of parallel light 13 is sent incoherent directional light by behind the panda type polarization-preserving fiber 11, on the front focal plane of optical microscope 12, form a measurable curve of light distribution, the curve of light distribution is had the ccd video camera 19 of A/D translation function and is noted behind optical microscope 12, and be saved on the computing machine 20,20 pairs of light distribution of noting of computing machine are analyzed and control step motor driver 21 rotates polarization maintaining optical fibre 11, thereby realize dead axle.In this experimental system, the two ends that drive polarization maintaining optical fibre 11 with two stepper motor drivers 21 rotate, and the stepper motor step angle that is adopted is 1.8 °, promptly whenever make a move is 1.8 °, carry out 72 segmentations again, reach that whenever to walk for four steps be exactly 0.1 °, its precision can meet the demands on angle changes.Experimental system for the present invention's use, the final detection in the CCD output image, corresponding about 250 pixels of polarization maintaining optical fibre cladding diameter (the panda optic fibre diameter that is adopted is 125 μ m), therefore pixel resolution is about 125/250=0.5 μ m/ pixel, this pixel resolution is comparatively desirable, can reach precision preferably.
Comparing embodiment
Test at the panda optic fibre that company of Chinese Wuhan Changfei produces, the characteristics of five-finger type light distribution eigenwert determining method of the present invention are described in view of the above, and compare with original axis fixation method.
1 eigenvalue graph form
As shown in Figure 6, curve among the figure is respectively that POL method, 5 method of characteristic, five-finger type light distribution eigenwert determining method are in polarization principal axis is 80 ° to 104 ° variation ranges, three's light intensity characteristic value separately is with the pairing empirical curve of the variation of angle, horizontal ordinate is the position angle of polarization principal axis, and ordinate is the light intensity characteristic value (arbitrary unit) of method separately.Can learn by the eigenvalue graph among Fig. 6, between 86 ° to 90 °, the light intensity characteristic value of five-finger type light distribution eigenwert determining method drops to 9.663 from 13.346, and variable quantity is 3.683, and the variable quantity of the light intensity characteristic value of 5 method of characteristic and POL method is respectively 2.601,1.999.Similarly, between 90 ° to 94 °, the light intensity characteristic value of five-finger type light distribution eigenwert determining method rises to 14.708 from 9.663, and variable quantity is 5.045, and the variable quantity of the light intensity characteristic value of 5 method of characteristic and POL method is respectively 4.705,3.841.Can draw thus, near 90 ° (between 80 ° to 100 °, promptly ± 10 in ° scope), the eigenwert variable quantity of five-finger type light distribution eigenwert determining method is all bigger than the eigenwert variable quantity of 5 method of characteristic, POL method, and the eigenvalue graph of five-finger type light distribution eigenwert determining method is more obvious with the variation of angle, more precipitous.
2 measure the comparison of sensitivity
In the azimuthal judgement of polarization maintaining optical fibre, measure sensitivity and also can decide by the slope of eigenvalue graph, promptly under the identical situation of angle variable quantity, the eigenwert variable quantity is big more, and sensitivity is high more.When we make the position angle variable quantity are 0.56 ° on a certain definite angle position, the curve map of light intensity characteristic value variation delta I, as shown in Figure 7.Horizontal ordinate among Fig. 7 is the position angle of polarization principal axis, and ordinate is the light intensity characteristic value variable quantity (arbitrary unit) of position angle correspondence when changing 0.56 ° on a certain definite angle position.Can learn by Fig. 7, in whole horizontal ordinate zone (87.75 ° to 92.25 °, promptly near 90 ° ± 2.25 ° of scopes in), the light intensity characteristic value variable quantity of five-finger type light distribution eigenwert determining method is much larger than the eigenwert variable quantity of POL method and 5 method of characteristic.For example, the eigenwert variable quantity maximal value of five-finger type light distribution eigenwert determining method is on 90 °, during 0.56 ° of every variation, its size is 2.347 units, and the maximum variable quantity of the eigenwert of 5 method of characteristic and POL method all is to locate at 89.4375 °, be respectively 1.537 units, 1.006 units, it is the sensitiveest that the eigenwert of visible five-finger type light distribution eigenwert determining method changes with angle.Being apparent that more that 90 ° of positions the eigenwert variable quantity of five-finger type light distribution eigenwert determining method is 2.347 units, only is 0.32 unit and the eigenwert variable quantity of 5 method of characteristic is the eigenwert variable quantity of 1.035 units, POL method.Can draw by top resulting data, compare with the POL method with 5 method of characteristic, near 90 °, five-finger type light distribution eigenwert determining method will make azimuthal measurement sensitivity obtain to increase exponentially, near 90 ° of positions experiment dead axle precision can be better than 0.5 °, and Theoretical Calculation shows that the dead axle precision can reach 0.1 °.Also explanation simultaneously, though the dead axle of 5 method of characteristic is highly sensitive in the POL method, and the sensitivity of five-finger type light distribution eigenwert determining method more is better than 5 method of characteristic, the sensitivity of five-finger type light distribution eigenwert determining method is the highest in the three.
Claims (10)
1, a kind of polarization-preserving fiber axis fixing method based on the side-looking light distribution comprises the steps:
(1) the dead axle polarization maintaining optical fibre is treated in the irradiation of incoherent directional light side direction, is made on the plane of vision of microcobjective and form a measurable light distribution that described light distribution images on the video camera through microcobjective;
(2) adjust distance between polarization maintaining optical fibre and the object lens, make the pattern curve of light distribution present the distribution of " five-finger type ", be called " the five-finger type curve of light distribution ";
(3) rotation polarization maintaining optical fibre obtains a series ofly along with polarization maintaining optical fibre is positioned at the azimuthal light intensity characteristic amount of different polarization axle, and draws the measurement curve of light intensity characteristic amount with the polarization axle azimuthal variation;
(4) obtain typical curve through handling;
(5) will measure curve and typical curve is done simple crosscorrelation, the pairing angle of the maximum value of simple crosscorrelation is the residing position angle of polarization maintaining optical fibre.
2, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 1 is characterized in that, there are five crests and four troughs in described " the five-finger type curve of light distribution " central authorities, have nine unique points.
3, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 2, it is characterized in that, described " the five-finger type curve of light distribution " rises from left to right, and unique point is followed successively by first crest, first trough, second crest, second trough, the 3rd crest, the 3rd trough, the 4th crest, the 4th trough and the 5th crest.
4, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 3, it is characterized in that, the data sum of first crest value of described unique point, first trough value, second crest value, second trough value, the 3rd crest value deducts the data sum of the 3rd trough value, the 4th crest value, the 4th trough value, the 5th crest value, and resulting difference is the light intensity characteristic amount.
5, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 4 is characterized in that, described light intensity characteristic amount is corresponding one by one with the position angle of polarization maintaining optical fibre polarization axle.
6, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 1, it is characterized in that, described typical curve obtains as follows: carry out simulation calculation with the Ray-tracing Method programming, calculate on the inspection surface light distribution pattern that presents " five-finger type ", and simulation calculation goes out the light intensity characteristic amount of polarization maintaining optical fibre different orientations, and draws the typical curve of theoretical light intensity characteristic quantity with the polarization axle azimuthal variation; Perhaps in experiment, record the light intensity characteristic amount with the curve of polarization axle azimuthal variation and utilize its symmetry and periodically carrying out Fourier expansion obtains the typical curve of initial angle for zero degree.
7, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 1 is characterized in that, the rotation polarization maintaining optical fibre adopts two stepper motors to rotate synchronously in the described step (3).
8, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 1 is characterized in that, the precision of the angle of rotation polarization maintaining optical fibre reaches more than 0.1 ° in the described step (3).
9, the polarization-preserving fiber axis fixing method based on the side-looking light distribution according to claim 1 is characterized in that, described video camera is a charge coupling camera, and image pixel resolution is more than the 0.5 μ m/ pixel.
10, a kind of polarization-preserving fiber axis fixing method based on the side-looking light distribution is in the making Application for Field of polarization-maintaining fiber coupler and polarization-maintaining fiber polarizer, polarization maintaining optical fibre welding, optical fibre gyro.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610035056 CN1831572A (en) | 2006-04-18 | 2006-04-18 | Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application |
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| CN 200610035056 CN1831572A (en) | 2006-04-18 | 2006-04-18 | Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application |
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| CN 200610035056 Pending CN1831572A (en) | 2006-04-18 | 2006-04-18 | Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application |
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| CN101980060A (en) * | 2010-09-15 | 2011-02-23 | 暨南大学 | Lateral view light intensity five-finger type distribution-based axis fixing method of polarization-maintaining optical fiber polarization axis |
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| CN104614803A (en) * | 2015-01-27 | 2015-05-13 | 北京航空航天大学 | ARM-based integrated polarization maintaining fiber axis positioning instrument |
| CN104614803B (en) * | 2015-01-27 | 2018-03-06 | 北京航空航天大学 | Integrated polarization-preserving fiber axis fixing instrument based on ARM |
| CN105068180A (en) * | 2015-07-16 | 2015-11-18 | 北京航空航天大学 | Side-view imaging azimuth-aligning method and apparatus for polarization maintaining fiber |
| CN105068180B (en) * | 2015-07-16 | 2018-03-16 | 北京航空航天大学 | A kind of polarization maintaining optical fibre side view imaging axis fixation method and device |
| CN105182469A (en) * | 2015-09-25 | 2015-12-23 | 北京航空航天大学 | Polarization maintaining optical fiber axis positioning method based on side view light intensity curve correlation peak sharp degrees |
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| CN110888197A (en) * | 2019-12-11 | 2020-03-17 | 北京工业大学 | Polarization maintaining optical fiber counter shaft device based on optical fiber internal microstructure far-field pattern |
| CN115371959A (en) * | 2022-10-25 | 2022-11-22 | 中国电子科技集团公司第四十六研究所 | Polarization maintaining optical fiber five-finger side lobe characteristic value axis fixing method |
| CN115371959B (en) * | 2022-10-25 | 2023-03-03 | 中国电子科技集团公司第四十六研究所 | Polarization maintaining optical fiber five-finger side lobe characteristic value axis fixing method |
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