CN101980060A - Lateral view light intensity five-finger type distribution-based axis fixing method of polarization-maintaining optical fiber polarization axis - Google Patents
Lateral view light intensity five-finger type distribution-based axis fixing method of polarization-maintaining optical fiber polarization axis Download PDFInfo
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- CN101980060A CN101980060A CN 201010284088 CN201010284088A CN101980060A CN 101980060 A CN101980060 A CN 101980060A CN 201010284088 CN201010284088 CN 201010284088 CN 201010284088 A CN201010284088 A CN 201010284088A CN 101980060 A CN101980060 A CN 101980060A
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Abstract
The invention discloses a lateral view light intensity five-finger type distribution-based axis fixing method of a polarization-maintaining optical fiber polarization axis. The method comprises the following steps of: laterally irradiating incoherent parallel light to polarization-maintaining optical fibers of an axis to be fixed to ensure that a measurable light intensity distribution is formed on an observing plane of a micro objective, wherein the light intensity distribution is imaged on a camera by the micro objective to form a 'five-finger type' light intensity distribution curve; calculating autocorrelation coefficients of the light intensity distribution curve; and accurately fixing an axis for the polarization-maintaining optical fibers according to characteristic values of 'five-finger type' wave peaks and wave troughs. The method has no need to establish a standard curve any more, thereby significantly improving the axis fixing efficiency. The method is mainly suitable for the condition that the polarization axis is nearby 0 or 90 degrees and the requirement on axis fixing accuracy is very high, and generally, the requirement exists when a polarization-maintaining optical fiber coupler and a polarization-maintaining optical fiber polarizer are manufactured. The method can be used for manufacturing the polarization-maintaining optical fiber coupler, the polarization-maintaining optical fiber polarizer, the heat sealing of the polarization-maintaining optical fibers, a polarization-maintaining optical fiber fused taper, an optical fiber gyroscope and the like.
Description
Technical field
The present invention relates to the axis fixation method of polarization maintaining optical fibre polarization axle, specifically is a kind of axis fixation method of the polarization maintaining optical fibre polarization axle that distributes based on side-looking light intensity five-finger type.
Background technology
When making polarization-maintaining fiber coupler, two accurate dead axles of polarization maintaining optical fibre as shown in Figure 1, need be carried out fused biconical taper with two polarization maintaining optical fibres then.The dead axle precision of two polarization maintaining optical fibres is high more, and the performance of coupling mechanism is good more.
Application number is 200610035056.6 Chinese invention patent application, discloses a kind of high precision dead axle method of the polarization maintaining optical fibre polarization axle based on five-finger type side-looking light distribution.Adjust the distance between polarization maintaining optical fibre and the microcobjective, make the pattern curve of light distribution present the distribution of " five-finger type ", there are five crests, four troughs in central authorities, have nine unique points; The rotation polarization maintaining optical fibre, obtain a series of light intensity characteristic amounts that are positioned at different orientations along with polarization maintaining optical fibre, and draw the measurement curve of light intensity characteristic amount with the polarization axle azimuthal variation, processing obtains typical curve, to 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.
But in the method, typical curve is not general, even the optical fiber of same producer different batches all needs to rebulid typical curve, and this is quite inconvenient in actual applications.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of axis fixation method of the polarization maintaining optical fibre polarization axle that distributes based on side-looking light intensity five-finger type is provided, this method does not need to set up typical curve, thereby very convenient in actual applications.
Purpose of the present invention is achieved through the following technical solutions:
The axis fixation method of the polarization maintaining optical fibre polarization axle that distributes based on side-looking light intensity five-finger type comprises the steps:
(1) the dead axle polarization maintaining optical fibre is treated in incoherent directional light side direction irradiation, make and form a measurable light distribution on the plane of vision of microcobjective, described light distribution images on the video camera through microcobjective, and the image of video camera picked-up imports computing machine into and carries out subsequent treatment;
(2) in computing machine, the image transitions that video camera is absorbed becomes the curve of light distribution;
(3) distance between adjustment polarization maintaining optical fibre and the microcobjective makes the curve of light distribution present the distribution of " five-finger type "; In the distribution of " five-finger type ", comprise nine unique points, from left to right, be respectively primary peak, first trough, secondary peak, second trough, the 3rd crest, the 3rd trough, the 4th crest, the 4th trough, the 5th crest; Its value is respectively V
1, V
2, V
3, V
4, V
5, V
6, V
7, V
8, V
9
Define the first differentiation amount Δ
1:
Δ
1＝V
1-V
2+V
3-V
4+V
5-V
6+V
7-V
8+V
9；
Define the second differentiation amount Δ
2:
Δ
2=V
5-V
7Or
Δ
2=V
5-V
3Or
Δ
2＝V
5-(V
3+V
7)/2；
(4) rotation polarization maintaining optical fibre, the polarization axle of polarization maintaining optical fibre rotates thereupon, obtains the azimuthal curve of light distribution of different polarization axle and the first differentiation amount and the second differentiation amount of a series of corresponding polarization maintaining optical fibres like this;
Draw the measurement curve of the first differentiation amount thus with the polarization axle azimuthal variation, when the variable quantity of the first adjacent differentiation amount goes to zero, show the polarization axle position angle be in 0 ° near or 90 ° near;
(5) calculate the above-mentioned coefficient of autocorrelation that is near near the curve of light distribution of each the polarization axle position angle correspondence 0 ° or 90 °, obtain coefficient of autocorrelation and the azimuthal corresponding curve of polarization axle; When coefficient of autocorrelation is in maximum value and approaches 1, show that this moment, the polarization axle position angle was 0 ° or 90 °; The second differentiation amount of using judges that the second differentiation amount is that canonical explanation polarization axle position angle is 0 °, and the second differentiation amount illustrates then that for negative the polarization axle position angle is 90 °.
Further, the computing method of the described coefficient of autocorrelation of step (5) are as follows: in the curve of light distribution, be central point with unique point the 3rd crest, get n pixel left successively, its light intensity value is designated as x respectively
1, x
2... x
nGet n pixel to the right successively, its light intensity value is designated as y respectively
1, y
2... y
nCalculate coefficient of autocorrelation according to following formula:
In the formula, R is a coefficient of autocorrelation;
Be x
1, x
2... x
nMean value;
Be y
1, y
2... y
nMean value.
Further, can reflect the symmetry of the curve of light distribution well, correspond to x as if the unique point primary peak in order to make the coefficient of autocorrelation that calculates
m, the value of n is determined by following formula: m≤n≤3m.
Further, in the step (3), adjust the distance between polarization maintaining optical fibre and the microcobjective, the distance L that makes plane of vision and polarization maintaining optical fibre fibre core is 150 μ m～152 μ m, can obtain the curve of light distribution of comparatively ideal " five-finger type " like this.
Further, in the step (4), adopt two stepper motors to rotate realization synchronously during the rotation polarization maintaining optical fibre.
The present invention compared with prior art has following advantage and beneficial effect:
(1) 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 curve of light distribution of side elevation image of the present invention presents the distribution of " five-finger type ".The present invention compares with the POL method with 5 method of characteristic, and the eigenwert variable quantity of light intensity symmetrical distribution determining method is all bigger than the eigenwert variable quantity of 5 method of characteristic, POL method, and eigenvalue graph is more obvious with the variation of angle, and is more precipitous.In addition, near 0 ° or 90 °, light intensity symmetrical distribution 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 °, and actual dead axle precision depends on the resolution of microscope and CCD.Of the present invention when can be applicable to make polarization-maintaining fiber coupler to the accurate dead axle of polarization maintaining optical fibre.
(2) compare with 200610035056.6 Chinese invention patent application, the present invention no longer needs to set up typical curve, thereby can significantly improve dead axle efficient.
(3) the polarization maintaining optical fibre polarization axle axis fixation method that distributes based on side-looking light intensity five-finger type of the present invention, mainly be 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 (0 °) just is with the counter clockwise direction rotation angle of directional light), usually welding, the polarization maintaining optical fibre that has this requirement, the present invention to can be applicable to make polarization-maintaining fiber coupler, polarization-maintaining fiber polarizer, polarization maintaining optical fibre when making polarization-maintaining fiber coupler and polarization-maintaining fiber polarizer draws awl, optical fibre gyro etc.
Description of drawings
Fig. 1 put synoptic diagram during dead axle for polarization-maintaining fiber coupler before making.
Fig. 2 is for realizing the device synoptic diagram of axis fixation method of the present invention.
Curve of light distribution when Fig. 3 is in 90 ° of position angles for polarization maintaining optical fibre.
Fig. 4 is near the broken line graph of the first differentiation amount of (86 °～94 °) each corresponding angle 90 °.
Fig. 5 is near the broken line graph of the coefficient of autocorrelation of (87 °～93 °) each corresponding angle 90 °.
Curve of light distribution when Fig. 6 is in 0 ° of position angle for polarization maintaining optical fibre.
Among the figure, 1: primary peak; 2: the first troughs; 3: secondary peak; 4: the second troughs; 5: the three crests; 6: the three troughs; 7: the four crests; 8: the four troughs; 9: the five crests; 11: polarization maintaining optical fibre; 12: microcobjective; 13: incoherent source of parallel light; 14: incoherent directional light; 15: plane of vision; The 16:CCD video camera; 17: the polarization axle position angle of polarization maintaining optical fibre; 18: polarization maintaining optical fibre polarization principal axis (slow axis).
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
A kind of polarization maintaining optical fibre polarization axle axis fixation method that distributes based on side-looking light intensity five-finger type:
(1) as shown in Figure 2, incoherent directional light 14 side direction that incoherent source of parallel light 13 is sent shine 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 to the effect that the incident directional light produces a similar cylindrical lens, make on the distance fiber optic hub is the plane of vision 15 of L, to have formed a measurable light distribution.This light distribution has comprised the spatial positional information of polarization maintaining optical fibre polarization axle, and the ccd video camera 16 that can be had an A/D translation function is noted.Adjust the distance of microcobjective 12 and polarization maintaining optical fibre 11, then the pattern of the light distribution of ccd video camera 16 records can change to some extent.Adjustment generally speaking, the pattern of the curve of light distribution of record are " mountain " type and distribute.In the surface of intensity distribution, get a column data on the direction vertical, can constitute the curve of light distribution of polarization maintaining optical fibre by this column data with optical fiber.
(2) two ends of polarization maintaining optical fibre are by being fixed to clamp by anchor clamps respectively, and the rear side of anchor clamps all is connected with stepper motor, and two stepper motors are fixed on the translation stage.By adjusting translation stage, treat distance between dead axle polarization maintaining optical fibre 11 and the microcobjective 12 to reach careful adjustment, thereby realize the position of the plane of vision 15 of careful adjusting microcobjective 12, when regulating among Fig. 2 the distance L of plane of vision and polarization maintaining optical fibre fibre core and be 150 μ m～152 μ m, the curve of light distribution of record can occur and different generally speaking patterns on ccd video camera 16, as shown in Figure 3, the pattern curve of the side direction curve of light distribution of the polarization maintaining optical fibre of this record presents the distribution of " five-finger type ".
(3) as shown in Figure 3, there are five crests, four troughs in the central authorities of the curve of light distribution of " five-finger type ", have nine unique points, from left to right, be defined as primary peak 1, first trough 2, secondary peak 3, second trough 4, the 3rd crest 5, the 3rd trough 6, the 4th crest 7, the 4th trough 8, the 5th crest 9 respectively.The slow axis of polarization maintaining optical fibre and the angle theta of directional light are exactly the polarization axle position angle 17 (polarization maintaining optical fibre slow axis with the counterclockwise angle of directional light for just) of polarization maintaining optical fibre this moment.
(4) according to the curve of light distribution of noting, the value of primary peak 1, the value of secondary peak 3, the value of the 3rd crest 5, the value of the 4th crest 7, the value sum of the 5th crest 9 are deducted the value of the value of the value of first trough 2, second trough 4, the 3rd trough 6, the value sum of the 4th trough 8, and resulting difference is as the first differentiation amount.
(5) rotate polarization maintaining optical fibre 11 synchronously with two stepper motors, differentiation amount in the time of can obtaining being positioned at different orientations along with polarization maintaining optical fibre, draw the measurement curve of the first differentiation amount thus with the polarization axle azimuthal variation, as shown in Figure 4, when the polarization axle position angle of polarization maintaining optical fibre was near 90 °, the variable quantity of the first differentiation amount went to zero.The polarization axle position angle of polarization maintaining optical fibre is near 0 ° the time, and the variable quantity of the first differentiation amount also goes to zero.
(6) near the coefficient of autocorrelation of the curve of light distribution of the polarization axle position angle correspondence calculating 0 ° or 90 °:
In the curve of light distribution, be central point with unique point the 3rd crest 5, get n pixel left successively, its light intensity value is designated as x respectively
1, x
2... x
nGet n pixel to the right successively, its light intensity value is designated as y respectively
1, y
2... y
nCalculate coefficient of autocorrelation according to following formula:
In the formula, R is a coefficient of autocorrelation;
Be x
1, x
2... x
nMean value;
Be y
1, y
2... y
nMean value.
In the present embodiment, adopting the CCD of 320*240, comprise 320 pixels in the curve of light distribution, is initial point 0 with the 3rd crest 5, the corresponding Xm of primary peak then, m is 45, the value of n can be got 45≤n≤135, in the present embodiment, n value 125, result of calculation are as shown in Figure 5.This moment each polarization axle azimuth angle theta, just corresponding coefficient of autocorrelation R
0, as shown in Figure 5, the maximum value of coefficient of autocorrelation and the polarization axle position angle of approaching 1 o'clock correspondence are 0 ° or 90 °.Method of discrimination for 0 ° and 90 ° is: the mean value that deducts the value of the value of secondary peak 3 and the 4th crest 7 with the value of the 3rd crest 5 is the second differentiation amount, when difference be on the occasion of the time, then the polarization axle position angle is 0 ° (curve of light distribution when optical fiber polarisation axle position angle is 0 ° is as shown in Figure 6); When difference was negative value, then optical fiber polarisation axle position angle was 90 °.
Claims (5)
1. the axis fixation method of the polarization maintaining optical fibre polarization axle that distributes based on side-looking light intensity five-finger type is characterized in that comprising the steps:
(1) the dead axle polarization maintaining optical fibre is treated in incoherent directional light side direction irradiation, make and form a measurable light distribution on the plane of vision of microcobjective, described light distribution images on the video camera through microcobjective, and the image of video camera picked-up imports computing machine into and carries out subsequent treatment;
(2) in computing machine, the image transitions that video camera is absorbed becomes the curve of light distribution;
(3) distance between adjustment polarization maintaining optical fibre and the microcobjective makes the curve of light distribution present the distribution of " five-finger type "; In the distribution of " five-finger type ", comprise nine unique points, from left to right, be respectively primary peak, first trough, secondary peak, second trough, the 3rd crest, the 3rd trough, the 4th crest, the 4th trough, the 5th crest; Its value is respectively V
1, V
2, V
3, V
4, V
5, V
6, V
7, V
8, V
9
Define the first differentiation amount Δ
1:
Δ
1＝V
1-V
2+V
3-V
4+V
5-V
6+V
7-V
8+V
9；
Define the second differentiation amount Δ
2:
Δ
2=V
5-V
7Or
Δ
2=V
5-V
3Or
Δ
2＝V
5-(V
3+V
7)/2；
(4) rotation polarization maintaining optical fibre, the polarization axle of polarization maintaining optical fibre rotates thereupon, obtains the azimuthal curve of light distribution of different polarization axle and the first differentiation amount and the second differentiation amount of a series of corresponding polarization maintaining optical fibres like this;
Draw the measurement curve of the first differentiation amount thus with the polarization axle azimuthal variation, when the variable quantity of the first adjacent differentiation amount goes to zero, show the polarization axle position angle be in 0 ° near or 90 ° near;
(5) calculate the above-mentioned coefficient of autocorrelation that is near near the curve of light distribution of each the polarization axle position angle correspondence 0 ° or 90 °, obtain coefficient of autocorrelation and the azimuthal corresponding curve of polarization axle; When coefficient of autocorrelation is in maximum value and approaches 1, show that this moment, the polarization axle position angle was 0 ° or 90 °; The second differentiation amount of using judges that the second differentiation amount is that canonical explanation polarization axle position angle is 0 °, and the second differentiation amount illustrates then that for negative the polarization axle position angle is 90 °.
2. axis fixation method according to claim 1, it is characterized in that: the computing method of the described coefficient of autocorrelation of step (5) are as follows: in the curve of light distribution, with unique point the 3rd crest is central point, gets n pixel left successively, and its light intensity value is designated as x respectively
1, x
2... x
nGet n pixel to the right successively, its light intensity value is designated as y respectively
1, y
2... y
nCalculate coefficient of autocorrelation according to following formula:
In the formula, R is a coefficient of autocorrelation;
Be x
1, x
2... x
nMean value;
Be y
1, y
2... y
nMean value.
3. axis fixation method according to claim 2 is characterized in that: the unique point primary peak corresponds to x
m, the value of n is determined by following formula: m≤n≤3m.
4. according to each described axis fixation method of claim 1-3, it is characterized in that: in the step (3), adjust the distance between polarization maintaining optical fibre and the microcobjective, the distance L that makes plane of vision and polarization maintaining optical fibre fibre core is 150 μ m～152 μ m.
5. axis fixation method according to claim 4 is characterized in that: in the step (4), adopt two stepper motors to rotate realization synchronously during the rotation polarization maintaining optical fibre.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308978A (en) * | 2013-05-29 | 2013-09-18 | 北京航空航天大学 | Automatic polarization-maintaining optical fiber axis positioning system |
| CN103645537A (en) * | 2013-11-28 | 2014-03-19 | 北京浦丹光电技术有限公司 | Device based on polarization maintaining optical fiber end surface fixed axis and re-welding method of polarization maintaining optical fiber end surface fixed axis |
| CN104238002A (en) * | 2014-09-28 | 2014-12-24 | 北京航空航天大学 | Side-view imaging polarization-maintaining optical fiber axis setting method |
| 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 |
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|---|---|---|---|---|
| WO2006032128A1 (en) * | 2004-09-20 | 2006-03-30 | Opsens Inc | Optical sensor using low-coherence interferometry |
| CN1831572A (en) * | 2006-04-18 | 2006-09-13 | 暨南大学 | Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application |
| CN101533123A (en) * | 2009-04-21 | 2009-09-16 | 暨南大学 | Polarization-preserving fiber axis fixing method based on spatial diffraction light |
-
2010
- 2010-09-15 CN CN2010102840886A patent/CN101980060B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006032128A1 (en) * | 2004-09-20 | 2006-03-30 | Opsens Inc | Optical sensor using low-coherence interferometry |
| CN1831572A (en) * | 2006-04-18 | 2006-09-13 | 暨南大学 | Axling method of polarization protection fibre-optical polarization axle based on side-looking light-intensity distributed and its application |
| CN101533123A (en) * | 2009-04-21 | 2009-09-16 | 暨南大学 | Polarization-preserving fiber axis fixing method based on spatial diffraction light |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308978A (en) * | 2013-05-29 | 2013-09-18 | 北京航空航天大学 | Automatic polarization-maintaining optical fiber axis positioning system |
| CN103308978B (en) * | 2013-05-29 | 2014-11-12 | 北京航空航天大学 | Automatic polarization-maintaining optical fiber axis positioning system |
| CN103645537A (en) * | 2013-11-28 | 2014-03-19 | 北京浦丹光电技术有限公司 | Device based on polarization maintaining optical fiber end surface fixed axis and re-welding method of polarization maintaining optical fiber end surface fixed axis |
| CN103645537B (en) * | 2013-11-28 | 2016-02-10 | 北京浦丹光电股份有限公司 | Based on device and the welding process again thereof of polarization maintaining optical fibre end face dead axle |
| CN104238002A (en) * | 2014-09-28 | 2014-12-24 | 北京航空航天大学 | Side-view imaging polarization-maintaining optical fiber axis setting method |
| CN104238002B (en) * | 2014-09-28 | 2017-08-29 | 北京航空航天大学 | A kind of side view is imaged polarization-preserving fiber axis fixing method |
| 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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