CN108398242A - Elliptical polarization keeps the measuring device and method of optical fiber extinction ratio - Google Patents
Elliptical polarization keeps the measuring device and method of optical fiber extinction ratio Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
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Abstract
The invention discloses measuring devices and method that a kind of elliptical polarization keeps optical fiber extinction ratio, including sequentially connected wide spectrum light source, the polarizer, Polarization Controller, testing fiber, polarization analysis instrument, fiber adapter and computer.The wide spectrum light source forms the linearly polarized light of High Extinction Ratio through the polarizer, utilize Polarization Controller combination polarization analysis instrument, so that the polarization state for being input to testing fiber light is consistent with the eigenstate of polarization of the optical fiber, then the Stokes' parameter variation in poincare sphere is recorded, the variance of the power and another orthogonal to that eigenstate of polarization power of the eigenstate of polarization is calculated, extinction ratio of the testing fiber under the length is obtained；Recycle the decibels that former and later two extinction ratios are cut in cutback technique acquisition poor, the extinction ratio decibels as this section of testing fiber.Apparatus of the present invention and method can measure the extinction ratio that elliptical polarization keeps optical fiber, it can also be used to the measurement of conventional polarization maintaining optical fibre extinction ratio.
Description
Technical field
The present invention relates to the measuring devices that technical field of optical fiber more particularly to a kind of elliptical polarization keep optical fiber extinction ratio
And method.
Background technology
Polarization maintaining optical fibre is widely used in the fields such as optical fibre gyro, fibre optic hydrophone, coherent light communication, Fibre Optical Sensor.It is oval
It is a kind of Novel polarization-maintaining optical that polarization state, which keeps optical fiber, it is drawn by controlling the rotation of polarization-preserving fiber preform in wire drawing
It forms, the application demand of circular polarization state retainer member in the fields such as Fibre Optical Sensor can be met, therefore, elliptical polarization keeps optical fiber
It is called high birefringence spin fiber, elliptical polarization can be kept to stablize transmission, be the key that the systems such as optical fiber current mutual inductor
Device.
Polarization extinction ratio (hereinafter referred to as extinction ratio) is to weigh one of the important parameter of light polarization, and characterize polarization-maintaining
The important indicator of optical fiber or much polarizing device properties.Therefore, it is always that people are concerned about very much to the accurate measurement of extinction ratio
The problem of.Traditional definition about extinction ratio is essentially all two orhtogonal linear polarizaiton directions (such as the directions x and the direction y)
The decibels of power ratio.Based on traditional definition measure the method for extinction ratio also there are many kinds of, including rotatable polarizer method, Si Tuo
Gram this parametric method, backscattering method, heterodyne interferometry, White Light Interferometer.The above method, will be measured by being all attributed to by two mutually hangs down
The power of straight linearly polarized light.However, elliptical polarization keeps optical fiber different from common polarization maintaining optical fibre, eigenstate of polarization is not
Two orthogonal linear polarizations of x and y, it is two mutually orthogonal ellipses that elliptical polarization, which keeps the eigenstate of polarization of optical fiber,
Polarization state.Therefore, traditional measurement method for extinction ratio cannot measure the extinction ratio that elliptical polarization keeps optical fiber.
Invention content
The present invention provides measuring devices and method that a kind of elliptical polarization keeps optical fiber extinction ratio, to overcome existing disappear
Light ratio measuring method is not suitable for the problem of elliptical polarization keeps optical fiber.
To achieve the goals above, this invention takes following technical solutions.
According to an aspect of the invention, there is provided a kind of elliptical polarization keeps the measuring device of optical fiber extinction ratio, packet
Include sequentially connected wide spectrum light source, the polarizer, Polarization Controller, testing fiber, polarization analysis instrument, fiber adapter and calculating
Machine；
The wide spectrum light source gives the polarizer for generating wide spectrum optical, and by the optical transport；
The polarizer, for the light for coming from the wide spectrum light source to be converted to linearly polarized light, and by the linear polarization
Optical transport gives the Polarization Controller；
The Polarization Controller, for the linearly polarized light for coming from the polarizer to be transformed to the polarization with testing fiber
The consistent polarization state of eigenstate, and it is injected into testing fiber；
The polarization analysis instrument, for record testing fiber export polarization state Stokes' parameter and be shown in Pa'anga
On ball；
The fiber adapter, for realizing testing fiber cut before with cutting after between optical fiber connector and polarization analysis instrument
Interface adaptation；
The computer, the data for being recorded according to polarization analysis instrument calculate testing fiber and cut front and back extinction ratio
Decibels it is poor, the extinction ratio of the testing fiber is calculated according to the decibels difference.
Further, the wide spectrum light source by work in the semiconductor optical amplifier of spontaneous radiation state with work in it is spontaneous
The erbium-doped fiber amplifier cascade composition of radiation regimes.
Further, the polarizer includes the ordinary optic fibre for carrying GRIN Lens, polarization splitting prism and carries certainly
The linear polarization of condenser lens keeps optical fiber.
Further, the Polarization Controller includes manual fiber turns Polarization Controller.
Further, the Polarization Controller includes electronic Polarization Controller.
According to another aspect of the present invention, provide it is a kind of using the measuring device to elliptical polarization keep light
The method that fine extinction ratio measures, including：
After the polarizer receives the incidence for the light that wide spectrum light source transmits, linearly polarized light is formed by the polarizer, by institute
It states linearly polarized light and is transferred to the Polarization Controller；
Polarization Controller is adjusted, so that the polarization degree shown in polarization analysis instrument poincare sphere is reached maximum, and make to be injected into
The polarization state of testing fiber is consistent with the eigenstate of polarization of the testing fiber；
It keeps measuring environment constant, records the Stokes' parameter of the output light of the testing fiber in a period of time, and
The output of an eigenstate of polarization of the output light of testing fiber in this period is calculated according to the Stokes' parameter of record
Average light power P0With the meansquaredeviationσ of the output power of another orthogonal eigenstate of polarization；According to formula ER=10lg
(P0/ k σ) extinction ratio under the length is calculated, wherein k is confidence interval coefficient when measuring；
The decibels that extinction ratio before and after the testing fiber is cut is obtained using cutback technique are poor, using the decibels difference as institute
State the extinction ratio of testing fiber.
Further, it within identical a period of time, adjusts Polarization Controller and the output polarization state of testing fiber is existed
The area drawn on polarization analysis instrument reaches minimum so that is injected into the polarization state of testing fiber and the polarization of the testing fiber
Eigenstate is consistent.
Further, 95% or more the polarization state quantity of the value covering statistics of the confidence interval coefficient k.
Further, the same fiber adapter is used when measuring testing fiber and cutting forward and backward polarization state, it is described
Fiber adapter is equipped with spring pressuring plate, which only squeezes the sheath of testing fiber without squeezing testing fiber.
Further, increase a card at the sheath that the fiber adapter squeezes testing fiber, make testing fiber
It is not compact in the space that spring pressuring plate is propped up with card, and the spring pressuring plate is loosened repeatedly, it observes and is polarized in poincare sphere
State changes, if loosen spring pressuring plate, polarization state does not change, it is determined that the spring pressuring plate does not cause to squeeze to testing fiber
Pressure.
The elliptical polarization provided in an embodiment of the present invention it can be seen from the technical solution that embodiments of the invention described above provide
State keeps the measuring device of optical fiber extinction ratio and method not only to can be adapted for the measurement that elliptical polarization keeps state optical fiber extinction ratio,
It is readily applicable to the measurement of conventional polarization maintaining optical fibre extinction ratio.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, others are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structure for the measuring device that a kind of elliptical polarization provided in an embodiment of the present invention keeps optical fiber extinction ratio
Figure, wherein reference numeral are explained：101- wide spectrum light sources；The 102- polarizers；103- Polarization Controllers；104- testing fibers；105-
Polarization analysis instrument；
Fig. 2 is a kind of Computing Principle schematic diagram of extinction ratio provided in an embodiment of the present invention.
Specific implementation mode
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that is used in the specification of the present invention arranges
It refers to there are the feature, integer, step, operation, element and/or component, but it is not excluded that presence or addition to take leave " comprising "
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
When part is "connected" or "coupled" to another element, it can be directly connected to or be coupling-connected to other elements, Huo Zheye with optical fiber
There may be intermediary elements.In addition, " connection " used herein or " coupling " may include space optical coupling.It is used herein to arrange
Diction "and/or" includes any cell of one or more associated list items and all combines.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology) there is meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, will not be with idealizing or the meaning of too formal be explained.
For ease of the understanding to the embodiment of the present invention, done further by taking several specific embodiments as an example below in conjunction with attached drawing
Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
A kind of elliptical polarization provided in an embodiment of the present invention keeps structure such as Fig. 1 institutes of the measuring device of optical fiber extinction ratio
Show, including wide spectrum light source (101), the polarizer (102), Polarization Controller (103), oval holding optical fiber (104) to be measured, polarization point
Analyzer (105) and computer (106).Wherein, one end of the output end connection polarizer (102) of the wide spectrum light source (101), rises
Inclined device (102) other end is connect with Polarization Controller (103) one end, Polarization Controller (103) other end and elliptical polarization to be measured
State keeps one end connection of optical fiber (104), elliptical polarization to be measured to keep the other end and polarization analysis instrument of optical fiber (104)
(105) input terminal connection, the polarization analysis instrument (105) record polarization state distributed data in poincare sphere, polarization analysis instrument
(105) output end connection computer (106), the computer (106) calculate elliptical polarization to be measured by computer and keep
The extinction ratio of optical fiber (105).
Fig. 2 is a kind of Computing Principle schematic diagram of extinction ratio provided in an embodiment of the present invention, and the present invention realizes that extinction ratio is surveyed
The principle of amount is as follows：
The traditional definition of one polarised light extinction ratio be two orthogonal linear polarization (directions x and the directions y) power it
The decibels of ratio,
RE=10lg (Px/Py) (1)
When evaluating the extinction ratio of optical fiber with this definition, need to input with a linearly polarized light, and measure this linear polarization
Optical output power PxWith the power Δ P for being coupled to another orthogonal linearly polarized lighty, formula (1) should then be changed to
RE=10lg (Px/ΔPy) (2)
However this definition still has certain limitation.First, the eigenstate of polarization of tested optical fiber is not necessarily linear polarization
State, it may be the different form such as circularly polarized light, elliptically polarized light, therefore above-mentioned definition is not suitable for elliptical polarization holding
Optical fiber.Secondly as mode coupling occurs at random, so, the Δ P in formula (2)yIt is a random number, is counted when long
Average is zero, therefore should use Δ PyMean square deviation indicate.Third, theoretically, a circular polarization state or elliptical polarization,
The directions x and the directions y can be transformed to by a fixed Polarization Controller, and extinction ratio does not change, so without must
It is however emphasized that must be two linear polarization power ratios.For this purpose, the present invention by the concept of extinction ratio from " two orhtogonal linear polarizaitons
The decibels for " two cross-polarization eigenstates " power ratio are expanded in direction ".Consider above-mentioned factor, the present invention proposes public
Formula (2) is rewritten as
RE=10lg (Pξ/ΔPη) (3)
In formula, PξFor the output power of an eigenstate of polarization of input optical registration, Δ PηTo be coupled to and above-mentioned polarization sheet
Levy the mean square deviation of the output power of another orthogonal eigenstate of polarization of state.
Under this definition, it is important to how to find two orthogonal eigenstate of polarization and their power.
Assuming that an ideal optical system, the polarization state of light source input areOutput polarization state isThen
M is the Muller matrix of the optical system.
Ideally, ifIt is stable with M, thenIt is also stable.Therefore, it shows as in poincare sphere
One point.The power of another polarization state orthogonal with it is 0, and thus according to above-mentioned definition, extinction ratio is infinity.
Under actual conditions,It is not stable with M.It is influenced by the various factors such as manufacturing defect and inappropriate application, than
If optical source wavelength changes, fibre-optical bending is squeezed, reverses and the influences such as temperature change, leads to fiber lengths L and refractive index n
Change, cause the variation of M, changes so as to cause output polarization state, show in poincare sphere it is no longer a point, but one small
Region.At this moment, no matter how we adjust input polarization, and it is a point that can not also make its concentration, can only collect one
The Stokes' parameter of group distribution：
In formula,It is the Stokes vector of different moments；Respectively 3 basic vectors of Stokes vector；s1
(t),s2(t),s3(t) it is respectively 3 Stokes' parameter amounts of changing with time.
In order to obtain extinction ratio information in this group of random number, first, present invention uses wideband light source and the polarizer, with
Just stable input polarization is obtained.Secondly, the present invention used in elliptical polarization to be measured keep optical fiber, it be by
The rotation that polarization-preserving fiber preform is controlled when wire drawing is drawn, and the ellipse synthesized after its local linear birefringence and rotation is two-fold
All very high, the birefringence caused by various enchancement factors is penetrated, is not only much smaller than the local birefringence of this optical fiber, but also much smaller than rotation
The ellipse birefringence synthesized afterwards, therefore influence of the environment to polarization state can be more effectively resisted than common polarization maintaining optical fibre, significantly
Improve the stability of output polarization state.Therefore, theoretically when input polarization is directed at the eigenstate of polarization of testing fiber, both
It is not the ideal point of a concentration, nor that extends endlessly tampers at random, but the random of certain Statistical Distribution is presented
Distribution.
The present invention uses
The assembly average for indicating polarization state, in formula, ＜ ＞ indicate average value, it can be being averaged for set
Value, can also be the average value for the time.Since the random process is stationary random process, so for the average value of set
Equal to the average value for the time.(6) formula shows the average value for Stokes vector, is equal to each Stokes' parameter
Average value vector sum.
Variance is used in combination
The dispersion degree for indicating polarization state distribution, in formula,Indicate the average value for vector modulus value square, i.e., Indicate the modulus value square of vector average value, i.e.,Formula (7) shows polarization state point
The variance of cloth is equal to the difference of the average value of vector modulus value square and the modulus value square of vector average value.
It it is easy to show that
In formula,The variance of respectively 3 Stokes' parameters, that is, total variance are equal to each stoke
The sum of this parameter variance.Because being Gaussian Profile for each Stokes' parameter, the amplitude of the vector of synthesis is then max
Wei is distributed.
Lead to the variation of polarization state because of mode coupling caused by various defects and interference, assembly average is when long
Zero.Therefore, if constantly regulate input polarization, when being adjusted to the random fluctuation minimum of output polarization state, that is, varianceWhen minimum, you can recognize Stokes vectorCorresponding polarization state
For the eigenstate of polarization of the testing fiber under the present situation.Corresponding power P0It is exactly the work(of the eigenstate of polarization
Rate Pξ。
In order to seek the power Δ P of another eigenstate of polarization caused by mode couplingη, referring to Fig. 2, it is assumed that statistical average
Polarization state corresponds to O points, and the point of other polarization states will surround O point random distributions, such as Fig. 2 (a).If the centre of sphere of poincare sphere is P,
The O points of great circle nearby randomly take a point A, cross PO and A points and do a great circle, obtain Fig. 2 (b).If PB is PA on PO
Projection, angle θ, then
PB=PAcos θ=cos θ (9)
PB is contributions of the random polarization state A for eigenstate of polarization O points, and OB is exactly caused by mode coupling and inclined
The size delta P of another orthogonal eigenstate of polarization of eigenstate of shaking O pointsη.So average inclined using the meansquaredeviationσ of OB as deviateing
The power variance of polarization state, and enable
Δ P=k σ (10)
Wherein k is the coefficient that is determined according to the requirement of confidence interval.Substituting into extinction ratio formula (3) can obtain
ER=-10lg (k σ) (11)
Elliptical polarization described in above-mentioned Fig. 1 is kept in the measuring device of optical fiber extinction ratio：
The wide spectrum light source (101) is worked in one by a semiconductor optical amplifier in spontaneous radiation state
The erbium-doped fiber amplifier cascade composition of spontaneous radiation state.
Ordinary optic fibre, a polarization splitting prism, the band that the polarizer (102) carries GRIN Lens by one
There is the linear polarization of GRIN Lens that optical fiber fabrication is kept to form；Wherein polarization splitting prism is the polarization spectro of a High Extinction Ratio
Prism can form the linearly polarized light of High Extinction Ratio after wide spectrum light source (101) is incident.
The Polarization Controller (103) be one manually fiber turns controller either one by piezoelectric ceramics to light
Fibre is squeezed to change the electric controller of polarization state.
Above-mentioned elliptical polarization keeps the fundamental measurement process of the measuring device of optical fiber extinction ratio to include：
By adjusting Polarization Controller (103), keep the polarization degree shown in polarization analysis instrument (105) poincare sphere maximum, i.e.,
More than the polarization degree threshold value of setting, and make input polarization consistent with the eigenstate of polarization of testing fiber (104).It is specific and
Speech adjusts the output that Polarization Controller so that elliptical polarization to be measured keeps optical fiber and polarizes inclined within identical a period of time
The area drawn on vibration analysis instrument reaches minimum, and optical fiber is kept using the averaged SOP on the area as elliptical polarization to be measured
Output light an eigenstate of polarization.
It keeps measuring environment constant, records this in poincare sphere of polarization state of the output light of testing fiber in a period of time
Stokes parameter, and thus calculate the luminous power P of the eigenstate of polarization of the output light of testing fiber in this period0Therewith
The meansquaredeviationσ of the output power of another orthogonal eigenstate of polarization, according to formula ER=10lg (P0/ k σ) calculate the length
Under extinction ratio, wherein k is the coefficient that is determined according to the requirement of confidence interval.
Find out the extinction ratio for cutting forward and backward testing fiber (104), the decibels of two extinction ratios respectively using cutback technique
Difference, the decibels difference are the extinction ratio decibels of this section of tested optical fiber (104).Wherein it is before avoiding testing fiber 104 from cutting
Afterwards with the variation of 105 jointing of polarization analysis instrument, measurement result accuracy is influenced to arrive, testing fiber 104 is cut front and back
Same fiber adapter is all made of with polarization analysis instrument 105 to connect.In the selection of adapter, selection is a kind of only to be squeezed using spring
The jacket portions of press polish fibre should ensure that the fiber adapter is applied to described wait for without squeezing a kind of adapter of bare fibre
The pressure very little surveyed on optical fiber does not influence the output polarization state of testing fiber.
When installing optical fiber using fiber adapter, the reduction is for the method for testing fiber pressure：It is being adapted to
Device is fixed at the extruding point of optical fiber, and a thin card is increased, and is made in the space that optical fiber be in spring pressuring plate and card is propped up, not by
It squeezes, and loosens spring pressuring plate repeatedly, observe polarization state variation in poincare sphere, if loosen reed, polarization state does not change,
Illustrate that spring pressuring plate does not cause to squeeze to testing fiber.
In conclusion the measuring device and method of elliptical polarization holding optical fiber extinction ratio provided in an embodiment of the present invention are not
It only can be adapted for the measurement that elliptical polarization keeps state optical fiber extinction ratio, be readily applicable to the survey of conventional polarization maintaining optical fibre extinction ratio
Amount.
One of ordinary skill in the art will appreciate that：Attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Flow is not necessarily implemented necessary to the present invention.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates may or may not be physically separated, the component shown as unit can be or
Person may not be physical unit, you can be located at a place, or may be distributed over multiple network units.It can root
According to actual need that some or all of module therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (10)
1. a kind of elliptical polarization keeps the measuring device of optical fiber extinction ratio, which is characterized in that including sequentially connected wide spectrum optical
Source, the polarizer, Polarization Controller, testing fiber, polarization analysis instrument, fiber adapter and computer；
The wide spectrum light source gives the polarizer for generating wide spectrum optical, and by the optical transport；
The polarizer for the light for coming from the wide spectrum light source to be converted to linearly polarized light, and the linearly polarized light is passed
It is defeated by the Polarization Controller；
The Polarization Controller, it is intrinsic with the polarization of testing fiber for being transformed to the linearly polarized light for coming from the polarizer
The consistent polarization state of state, and it is injected into testing fiber；
The polarization analysis instrument, for record testing fiber export polarization state Stokes' parameter and be shown in poincare sphere
On；
The fiber adapter, for realizing testing fiber cut before with cutting after connecing between optical fiber connector and polarization analysis instrument
Mouth adaptation；
The computer, the data for being recorded according to polarization analysis instrument calculate point that testing fiber cuts front and back extinction ratio
Shellfish number is poor, and the extinction ratio of the testing fiber is calculated according to the decibels difference.
2. elliptical polarization as described in claim 1 keeps the measuring device of optical fiber extinction ratio, which is characterized in that the wide range
Light source is by working in the semiconductor optical amplifier of spontaneous radiation state and working in the erbium-doped fiber amplifier of spontaneous radiation state
Cascade composition.
3. elliptical polarization as described in claim 1 keeps the measuring device of optical fiber extinction ratio, which is characterized in that described to be polarized
Device includes that ordinary optic fibre, polarization splitting prism and the linear polarization with GRIN Lens with GRIN Lens keep optical fiber.
4. keeping the measuring device of optical fiber extinction ratio by the elliptical polarization described in claims 1 or 2 or 3, which is characterized in that institute
It includes manual fiber turns Polarization Controller to state Polarization Controller.
5. keeping the measuring device of optical fiber extinction ratio by the elliptical polarization described in claims 1 or 2 or 3, which is characterized in that institute
It includes electronic Polarization Controller to state Polarization Controller.
6. a kind of measuring device using described in claim 1 to 5 any one keeps elliptical polarization the extinction ratio of optical fiber
The method measured, which is characterized in that including：
After the polarizer receives the incidence for the light that wide spectrum light source transmits, linearly polarized light is formed by the polarizer, by the line
Polarised light is transferred to the Polarization Controller；
Polarization Controller is adjusted, so that the polarization degree shown in polarization analysis instrument poincare sphere is reached maximum, and make to be injected into be measured
The polarization state of optical fiber is consistent with the eigenstate of polarization of the testing fiber；
Keep measuring environment constant, the Stokes' parameter of the output light of the testing fiber in record a period of time, and according to
The output that the Stokes' parameter of record calculates an eigenstate of polarization of the output light of testing fiber in this period is average
Luminous power P0With the meansquaredeviationσ of the output power of another orthogonal eigenstate of polarization；According to formula ER=10lg (P0/k
The extinction ratio under the length σ) is calculated, wherein k is confidence interval coefficient when measuring；
The decibels that extinction ratio before and after the testing fiber is cut is obtained using cutback technique are poor, which is waited for as described in
Survey the extinction ratio of optical fiber.
7. according to the method for claim 6, which is characterized in that within identical a period of time, adjusting Polarization Controller makes
The area that is drawn on polarization analysis instrument of output polarization state of testing fiber reaches minimum so that be injected into the light of testing fiber
Polarization state is consistent with the eigenstate of polarization of the testing fiber.
8. according to the method for claim 6, which is characterized in that the value covering of the confidence interval coefficient k counts inclined
95% or more polarization state quantity.
9. method as described in claim 6, which is characterized in that used when measuring testing fiber and cutting forward and backward polarization state
The same fiber adapter, the fiber adapter are equipped with spring pressuring plate, which only squeezes the sheath of testing fiber
Without squeezing testing fiber.
10. method as described in claim 9, which is characterized in that at the sheath that the fiber adapter squeezes testing fiber
Increase a card, keeps testing fiber not compact in the space that spring pressuring plate is propped up with card, and loosen the bullet repeatedly
Polarization state variation in poincare sphere is observed in spring tabletting, if loosen spring pressuring plate, polarization state does not change, it is determined that the spring
Tabletting does not cause to squeeze to testing fiber.
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| CN109781386A (en) * | 2019-01-16 | 2019-05-21 | 深圳太辰光通信股份有限公司 | A kind of polarised light extinction ratio test device of magneto-optic optical fiber |
| CN110849394A (en) * | 2019-11-19 | 2020-02-28 | 中国船舶重工集团公司第七0七研究所 | Quantitative evaluation method for light polarization state change of nuclear magnetic resonance gyroscope |
| CN111811655A (en) * | 2020-06-03 | 2020-10-23 | 浙江大学 | Method for evaluating polarization state of light, application, device, electronic equipment and medium |
| CN112146849A (en) * | 2020-08-07 | 2020-12-29 | 上海中科创欣通讯设备有限公司 | Method for measuring polarization-dependent attenuation of optical device |
| CN112485930A (en) * | 2020-11-18 | 2021-03-12 | 华中科技大学 | Control method and system for realizing polarization stability |
| CN114112329A (en) * | 2021-12-28 | 2022-03-01 | 长飞光纤光缆股份有限公司 | Polarization extinction ratio measuring system and method for lossless optical fiber |
| WO2022062447A1 (en) * | 2020-09-28 | 2022-03-31 | 浙江大学 | Polarization uniformity measurement method for non-uniformly totally polarized light, application, apparatus, electronic device, and storage medium |
| CN117740337A (en) * | 2023-12-29 | 2024-03-22 | 上海傲世控制科技股份有限公司 | Polarization-maintaining tail fiber extinction ratio rapid detection system and method |
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