CN1988420B - Method for detecting optic fiber polarization mode dispersion - Google Patents
Method for detecting optic fiber polarization mode dispersion Download PDFInfo
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- CN1988420B CN1988420B CN 200610125466 CN200610125466A CN1988420B CN 1988420 B CN1988420 B CN 1988420B CN 200610125466 CN200610125466 CN 200610125466 CN 200610125466 A CN200610125466 A CN 200610125466A CN 1988420 B CN1988420 B CN 1988420B
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Abstract
This invention relates to a measurement method for fiber polarization mode dispersion(PMD) under the zero strain state, which winds fibers to a test disk with the radius greater than or equal to 140mm from a small disk in the strain of 0-0.1N, and the fiber length winded on the disk for testing is 0.8-4.2km, the creel of the fiber on the disk is not over 6 rows, then the winded fiber is placed for over 40 min horizontally then is undergone the PMD test, which eliminates the influence of outside stress to PMD and gets more accurate PMD data.
Description
Technical field
The present invention relates to a kind of under zero tension state the method for testing of optic fiber polarization mould dispersion (PMD).
Technical background
Along with optical fiber communication develops rapidly to big capacity, wide bandwidth direction, the user is more and more higher to the requirement of bandwidth, so the 40Gbit/s system moves towards the foreground gradually.Polarization mode dispersion in the 40Gbit/s system (PMD) tolerance limit descends greatly, to the higher index request of PMD performance proposition of system.Up-to-date optic fibre manufacture process can be controlled at the PMD parameter of optical fiber in the scope that satisfies the transmission of 40Gbit/s signal.But the PMD of optical fiber is different from optical characteristics such as attenuation, and except the intrinsic property of optical fiber, the effect of the external carbuncle of bringing for crooked, reverse etc. is quite responsive.Generally, optical fiber manufacturer is in order to keep the optical fiber winding displacement under the long-distance transport situation, according to requirement of client, takeup tension is generally 0.6N or 0.3N during test PMD, so optical fiber producer often only is provided at the PMD on the fiber reel that records under certain tension force situation.Yet because the complexity of test optical fibre cables PMD, general optical cable supplier only provides the fiber PMD index to the client, and this obviously has certain unreliability.
(YD/T1065-2000) stipulate in the standard in " monomode fiber polarization mode dispersion test method ": during monomode fiber PMD test, no matter adopt which kind of method of testing, all require the sample winding radius minimum must not be less than 150mm, suffered external force be 0 (representative value is 0.15N) substantially.But, the length of sample optical fiber and the concrete grammar of zero tension test when this requires zero tension test of concrete regulation not.
The optical fiber of being produced at present should belong to round uniform lightguide in theory as monomode fiber G.652, and on cross section, refractive index evenly distributes in the annular section that a series of concentric circless constitute.But, the basic mode HE that light transmits in monomode fiber
11By orthogonal two polarization mould HE
11X and HE
11The y degeneracy constitutes, the axial propagation constant β of polarization mould in transmission course
xAnd β
yBecause the influence of technology destabilizing factor often do not wait, thereby form dielectric grid causes light pulse in output broadening phenomenon.Make the actual non-proper round uniform lightguide of product, and had the feature of non-round fiber waveguide.
Cause the unsettled reason of polarization state of light in the monomode fiber, the external factor such as external carbuncle that are subjected in the internal factor of optical fiber manufacturing itself and the test process are arranged.Its internal factor is: 1. production process can't guarantee that the fiber core cross section is absolute circle, always has certain ovality; 2. the material coefficient of thermal expansion coefficient is inconsistent causes anisotropy on the cross section of optic fibre and causes the anisotropy of optical fibre refractivity.These two kinds of reasons all make β on the cross section of optic fibre
xDirection and β
yThe propagation constant of direction is different.In addition, except that above internal factor, the interference of other external factor such as takeup tension when the PMD of optical fiber also can be subjected to testing.Because work as the time spent of doing that optical fiber is subjected to external force, coat partly can cause the deformation of Optical Fiber Transmission layer (covering and core segment) because of external force produces shearing force to inside of optical fibre, and deformation can cause β again
xDirection and β
yThe propagation constant of direction changes.On the other hand, because of β
xDirection and β
yIt is very little that direction differs, and under the effect of external force, these two kinds of polarization modes can be coupled mutually randomly, and these two kinds of reasons all can make PMD change.Hence one can see that, and all multifactor of takeup tension is very large to the PMD in single-mode fiber tests affect.And the randomness of external factor and inevitable property have further influenced the stable testing of PMD, therefore, provide the reliability of the PMD that optical fiber records on fiber reel with certain tension force can not satisfy client's demand merely.Because there is bigger difference in the residing stress state of optical fiber behind such test mode and the simulation stranding, test result has uncertainty and unsteadiness.
Summary of the invention
Technical problem to be solved by this invention be the deficiency that exists at above-mentioned prior art and provide a kind of under zero tension state the method for testing of optic fiber polarization mould dispersion (PMD), the residing stress state of optical fiber is approaching behind this test mode and the stranding, and test result is comparatively determined and be stable.
The present invention for the technical scheme that problem adopted of the above-mentioned proposition of solution is:
With optical fiber from the little fiber reel with the tension force of 0～0.1N around to the measuring fiber dish of radius more than or equal to 140mm,
The fiber lengths of testing on the measuring fiber dish is 0.8km～4.2km, and the winding displacement of optical fiber on the measuring fiber dish is no more than 6 rows,
Optical fiber is after to deep bid, and the horizontal positioned time is more than 20 minutes, makes optical fiber fully discharge the residual stress that produces in the coiling process,
Foundation " monomode fiber polarization mode dispersion test method " (YD/T1065-2000) requirement of standard is carried out the PMD test of optical fiber.
Press such scheme, the described horizontal positioned time is 1～2 hour.
Press such scheme, the radius of described measuring fiber dish is 140mm～400mm, and axial length is 750mm～1000mm, and the winding displacement of optical fiber on the measuring fiber dish is generally 1～2 row.
Press such scheme, optical fiber is at the interval of the winding displacement on the measuring fiber dish (axial air gap between every circle optical fiber) minimum 5～10um that is set to.
Beneficial effect of the present invention is: when 1, optical fiber is in zero tension state, substantially eliminated the influence of external carbuncle to the PMD test, so its test is repeated best, the PMD result of acquisition is the most reliable, PMD data more accurately can be provided, help producer and select suitable optical fiber for use; 2, the zero tension force PMD of optical fiber has better correlation with the PMD result behind the stranding, and test result shows that zero tension force PMD exists with the deviation of the PMD behind the stranding
In, can think the error that repetitive operation is introduced basically; Zero tension force PMD compares and has tension force PMD test chart to reveal better reliability, and is more approaching with the residing stress state of optical fiber behind the stranding; 3, parameters such as the length of tested optical fiber, flexibility are selected rationally, and therefore, method of testing is easy, and the PMD testing cost of optical fiber is low, helps applying.
Above-mentioned effect of the present invention also further confirms for following experiment:
1, the repeatability checking of zero tension force PMD test
In order to verify the repeatability of PMD under the zero tension force situation, choose three groups of optical fiber respectively around being that every group is carried out 6 times zero tension force, 0.3N and 0.6N tension force PMD test, obtain table 1 to the big fiber reel of radius 160mm:
PMD result of the test under the table 1 differential tension situation
Analytically table as can be known: the standard deviation of PMD result of the test is all in 0.002 under three kinds of situations, but zero tension force PMD repeatability is ideal in three kinds of situations, its standard deviation is all in 0.001, and the test standard deviation of 0.3N tension force PMD is all greater than 0.0012, and the test standard deviation of PMD is all greater than 0.0017 during 0.6N tension force.This explanation is along with the reduction of takeup tension, external carbuncle reduces gradually to the influence of fiber PMD, thereby when optical fiber is in zero tension state, has eliminated the influence of external carbuncle to the PMD test substantially, so its test is repeated best, the PMD result of acquisition is the most reliable.
2, PMD result's comparison behind zero tension force PMD test and the stranding:
Takeup tension is very big to the PMD in single-mode fiber tests affect, can get the PMD average of three groups of sample optical fiber and the relation of takeup tension by table 1, and as seen from Figure 5, along with the increase of takeup tension, the PMD result of test gained reduces on the contrary, and maximum difference has reached
Though the repeatability of zero tension force PMD test has the PMD testing standard deviation of tension force all to exist than the good of tension force PMD test arranged
In, be far smaller than the maximum difference between the dual mode.In order further to verify the reliability of zero tension force PMD test, we respectively to the long company that flies produce in a large number G.652 optical fiber carried out 0.6N takeup tension and zero tension force PMD test, and test in conjunction with stranding PMD, obtain Fig. 6, in conjunction with data among Fig. 6, can obtain by calculating: the average of zero takeup tension PMD is
0.6N the average of takeup tension PMD
PMD average behind the stranding is
Hence one can see that: monomode fiber zero tension force PMD test result has the PMD test under the tension force situation better to reflect PMD value behind the optical fiber cabling, and zero tension force PMD follows the PMD result behind the stranding to have better correlation.Simultaneously, zero tension force PMD exists with the deviation of the PMD behind the stranding
In, can think the error that repetitive operation is introduced basically.This shows that zero tension force PMD has compared tension force PMD test chart and revealed better reliability.
Description of drawings
Fig. 1 is the graph of a relation of fiber PMD and takeup tension.The lines of band rhombus are the PMD of 0.6N tension force among the figure, and the lines of band rectangle are the PMD of zero tension force, are PMD behind the stranding with leg-of-mutton lines.
Fig. 2 is a fiber PMD comparison diagram as a result under the differential tension situation.The same Fig. 2 of bar.
Embodiment
Below further specify embodiments of the invention.
Embodiment 1. gets the segment length and is the G652.D monomode fiber of 1km, and around being on the fiber reel of 200mm to radius, winding displacement is (axial air gap between every circle optical fiber) minimum 9um that is set at interval with zero tension force, places 40 fens kinds after, carry out PMD and test,
The little fiber reel of wraparound carries out the stranding experiment then, carries out the PMD test with same equipment, obtains
Embodiment 2. gets the G652.D monomode fiber of segment length for 2.1km, and around being on the fiber reel of 250mm to radius, winding displacement is (axial air gap between every circle optical fiber) minimum 7um that is set at interval, places after 40 minutes with zero tension force, carries out the PMD test,
The little fiber reel of wraparound carries out the stranding experiment then, carries out the PMD test with same equipment, obtains
Embodiment 3. gets the segment length and is the G652.D monomode fiber of 4.2km, with zero tension force around being on the fiber reel of 300mm to radius, places 40 fens kinds after, carry out PMD and test,
The little fiber reel of wraparound carries out the stranding experiment then, carries out the PMD test with same equipment, obtains
Claims (7)
1. a method for detecting optic fiber polarization mould dispersion is characterized in that
With optical fiber from the little fiber reel with the tension force of 0～0.1N around to radius more than or equal to 140mm measuring fiber dish on,
The fiber lengths of testing on the measuring fiber dish is 0.8km～14km, and the winding displacement of optical fiber on the measuring fiber dish is no more than 6 rows,
Optical fiber is after to deep bid, and the horizontal positioned time is more than 20 minutes, makes optical fiber fully discharge the residual stress that produces in the coiling process,
Foundation " monomode fiber polarization mode dispersion test method " (YD/T1065-2000) requirement of standard is carried out the PMD test of optical fiber.
2. by the described method for detecting optic fiber polarization mould dispersion of claim 1, it is characterized in that the described horizontal positioned time is 1～2 hour.
3. by claim 1 or 2 described method for detecting optic fiber polarization mould dispersion, the radius that it is characterized in that described measuring fiber dish is 140mm～400mm.
4. by the described method for detecting optic fiber polarization mould dispersion of claim 3, the axial length that it is characterized in that described measuring fiber dish is 750mm～1000mm, and the winding displacement of optical fiber on the measuring fiber dish is 1～2 row.
5. by the described method for detecting optic fiber polarization mould dispersion of claim 1, it is characterized in that getting the monomode fiber of segment length, around being on the fiber reel of 200mm to radius, place after 40 minutes, carry out the PMD test with zero tension force for 1km.
6. by the described method for detecting optic fiber polarization mould dispersion of claim 1, it is characterized in that getting the monomode fiber of segment length, around being on the fiber reel of 250mm to radius, place after 40 minutes, carry out the PMD test with zero tension force for 2.1km.
7. by claim 1 or 2 described method for detecting optic fiber polarization mould dispersion, it is characterized in that getting the monomode fiber of segment length, around being on the fiber reel of 300mm to radius, place after 2 hours, carry out the PMD test with zero tension force for 4.2km.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610125466 CN1988420B (en) | 2006-12-14 | 2006-12-14 | Method for detecting optic fiber polarization mode dispersion |
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| CN 200610125466 CN1988420B (en) | 2006-12-14 | 2006-12-14 | Method for detecting optic fiber polarization mode dispersion |
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| CN1988420A CN1988420A (en) | 2007-06-27 |
| CN1988420B true CN1988420B (en) | 2010-08-11 |
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| CN105180875B (en) * | 2015-10-21 | 2018-05-18 | 长飞光纤光缆股份有限公司 | A kind of test method of anti-bending multimode fiber numerical aperture |
| CN107192346B (en) * | 2017-06-02 | 2022-03-08 | 广州广电计量检测股份有限公司 | Calibration device and equipment of optical fiber strain tester |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5859939A (en) * | 1997-02-25 | 1999-01-12 | Mci Communications Corporation | Method and system for equalizing PMD using incremental delay switching |
| CN1346436A (en) * | 1999-03-31 | 2002-04-24 | 康宁股份有限公司 | System and method for measuring polarization mode dispersion in production |
| CN1584650A (en) * | 2004-06-09 | 2005-02-23 | 北京大学 | Polarizing mould dispersion simulator |
-
2006
- 2006-12-14 CN CN 200610125466 patent/CN1988420B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5859939A (en) * | 1997-02-25 | 1999-01-12 | Mci Communications Corporation | Method and system for equalizing PMD using incremental delay switching |
| CN1346436A (en) * | 1999-03-31 | 2002-04-24 | 康宁股份有限公司 | System and method for measuring polarization mode dispersion in production |
| CN1584650A (en) * | 2004-06-09 | 2005-02-23 | 北京大学 | Polarizing mould dispersion simulator |
Non-Patent Citations (1)
| Title |
|---|
| 中华人民共和国信息产业部.《单模光纤偏振模色散的试验方法》（YD/T1065-2000）标准.中华人民共和国通信行业标准.2000,1-23. * |
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