CN100557399C - Polarization maintaining fiber beat length measuring apparatus - Google Patents
Polarization maintaining fiber beat length measuring apparatus Download PDFInfo
- Publication number
- CN100557399C CN100557399C CNB2007100187554A CN200710018755A CN100557399C CN 100557399 C CN100557399 C CN 100557399C CN B2007100187554 A CNB2007100187554 A CN B2007100187554A CN 200710018755 A CN200710018755 A CN 200710018755A CN 100557399 C CN100557399 C CN 100557399C
- Authority
- CN
- China
- Prior art keywords
- polarization maintaining
- optical fibre
- maintaining optical
- light
- tested
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses a kind of polarization maintaining fiber beat length measuring apparatus, comprise light path system, force application apparatus, data acquisition and disposal system.Light path system contains light source, the crystal polarizer, condenser lens, crystal analyzer, and its effect is to provide linearly polarized light for measurement; Force application apparatus adopts the travel mechanism have the high precision two-way stepping motor, have the clamp system of safeguard measure and have the force application mechanism of micrometer, its effect is fixing tested polarization maintaining optical fibre, and radially apply certain pressure with move mode to it along the length direction of tested polarization maintaining optical fibre, make luminous power cyclical variation occur through exporting behind the tested polarization maintaining optical fibre; Data acquisition and disposal system are gathered the luminous power of tested optical fiber output by light power meter, after by computing machine the output of light power meter being handled accordingly and resolved, draw the change curve of the long and luminous power of the average bat of tested polarization maintaining optical fibre with acquisition time.Major advantage of the present invention is, and is simple in structure, easy to operate, the measuring accuracy height.
Description
Technical field
The invention belongs to the inertia device field of measuring technique, relate generally to a kind of polarization maintaining fiber beat length measuring apparatus, relating in particular to a kind of is the beat length of polarization maintaining optical fiber measurement mechanism that core and employing modulated pressure move the power method principle with the extinction ratio test component.
Technical background
Polarization maintaining optical fibre belongs to a kind of of single-mode fiber, and it is meant the core cross sections ovalization that deliberately makes optical fiber, or utilize non-rotational symmetry to produce birefringence so that two polarized waves of quadrature with the optical fiber of coupling scheme independent transmission not.Polarization maintaining optical fibre is widely used in sensory field of optic fibre, and it is mainly used and comprises optical fibre gyro etc.Clapping length is the important technology index of polarization maintaining optical fibre, and it has characterized the birefringenct property of polarization maintaining optical fibre.
The polarization maintaining optical fibre fibre core is not to be desirable circle, has certain ovality, simultaneously the isotropy that the refractive index of its section neither be absolute and have certain difference.In fact, what transmit in polarization maintaining optical fibre is not real single mode, but transmits two polarization modes, i.e. HE
11 xMould and HE
11 yMould.Along with the difference of fiber lengths, also can change with the phase differential between two orthogonal polarization modes of degenerate state transmission thereupon.Therefore, when incident light is a linearly polarized light, on the output terminal cross section of single-mode fiber, the emergent light synthetic by these two orthogonal polarization modes is the polarized light that the polarization direction changes with fiber lengths, and its polarization state periodically develops between linear polarization, elliptic polarization and circular polarization.The polarization evolution cycle is that phase differential is the xsect spacing L of 2 π
B, promptly clap long L
BAccording to this characteristic of polarization maintaining optical fibre, if apply the modulated pressure of one-period variation for one section polarization maintaining optical fibre, so along with force part moving along the polarization maintaining optical fibre length direction, this polarization maintaining optical fibre output polarization state of light (the luminous power size with a certain polarization direction characterizes) will generating period variation, and be to collect waveform and the wave number (referring to Fig. 1) that this polarization state changes by light power meter, these features that light power meter collects are sent in the computing machine that is composed of test procedure, the distance that can move along fiber length according to modulated pressure mechanism just, calculate the fiber lengths that polarization state changes one-period, just the bat of polarization maintaining optical fibre is long.
Chinese patent application CN1912564A discloses a kind of pressure perturbation method polarization maintaining fiber beat length measuring apparatus of China Nankai University invention.This beat length measuring apparatus comprise accurate displacement control device, signal processing analysis control system, liquid crystal touch screen, upper and analysis process system, Optical Fiber Transmission polarization state directly be coupled regulating device, force application mechanism, have the light path system of collimation lens and analyzing device, wherein, the power source of the force application mechanism of grip optical fiber has adopted magnet control, size by electric current changes the size of pressure, and pressure block directly contacts with bare fibre.Simultaneously, the analyzing device has adopted the polarizer of optical-fiber type, and the light path system end is provided with light signal pre-process module.But also there is following problem in this passive tester: adopt magnet control force application mechanism, because the closely existence in magnetic field, magnetic field is very important to the influence of polarization of light attitude in the polarization maintaining optical fibre; Force application mechanism directly contacts with optical fiber, and optical fiber is easy to impaired; The analyzing device adopts optical fiber polarizer, and polarization property is good inadequately; Light path system adopts collimation lens and light signal pre-process module, and its structure is too complicated.Above problem all has influence on the measuring accuracy of this beat length measuring apparatus, and makes troubles to operation.
Summary of the invention
The technical problem to be solved in the present invention is, the deficiency at prior art exists provides a kind of polarization maintaining fiber beat length measuring apparatus that adopts holocrystalline body polarizer and complete mechanical force application apparatus, and this measuring instrument not only structure is formed simply, has the modularization characteristic; And measuring accuracy is higher, and is simple to operate.
For solving the problems of the technologies described above, polarization maintaining optical fibre measuring instrument provided by the invention comprises light path system, force application apparatus, data acquisition and disposal system, described light path system contains light source, the polarizer, condenser lens, analyzer, fiber adapter, described fiber adapter is connected with tested polarization maintaining optical fibre, the light beam that light source sends is by forming first linearly polarized light behind the polarizer, the line focus lens focus is gone into tested polarization maintaining optical fibre in that the interface end face of fiber adapter is laggard again, described first linearly polarized light changes through its polarization characteristic of tested polarization maintaining optical fibre transmission back because of application of force generation elastic deformation, then becomes second linearly polarized light that identical polarization characteristic is arranged with first linearly polarized light again behind described analyzer; Described force application apparatus contains clamp system, displacement mechanism, pressure regulating device, base plate: described clamp system contains bar shape and two latch mechanisms that are fixed on the base plate, two latch mechanisms split on bar shape with certain spacing, and tested polarization maintaining optical fibre is placed on the upper surface of bar shape and keeps straight motionless state under the mating reaction of bar shape and latch mechanism; Described displacement mechanism contains two-way stepping motor, tooth bar transmission component, guide assembly, fixed part in the guide assembly and described base plate are connected, the tooth bar of its slipper and tooth bar transmission component is connected, and two-way stepping motor provides power for the tooth bar transmission component; Described pressure regulating device contains micrometer, joint and web joint, micrometer stands on joint top and its telescopic head and upper end of joint and is connected, the two ends of web joint are connected with the slipper of micrometer and described guide assembly respectively, and the groove that makes the joint lower end is over against described bar shape; Rotatablely moving of two-way stepping motor converts translation motion to and drives micrometer by guide assembly mobile on tested polarization maintaining optical fibre by the tooth bar transmission component; Described data acquisition and disposal system contain light power meter, are built-in with the computing machine of Survey Software bag, and the light power meter input end is connected with described analyzer by optical patchcord, and output terminal is connected with computing machine by cable; Described Survey Software includes control module, data acquisition module, gather the parameter module of cumulative number with two-way stepping motor step-length, luminous power extreme value criterion, luminous power extreme value, be equipped with the computing module of beat length of polarization maintaining optical fiber algorithm, the major function of this software is, the operation of control two-way stepping motor with stop, the luminous power extreme value of gathering light power meter output also writes down its moment corresponding, the average bat that calculates tested polarization maintaining optical fibre according to formula is long.
According to the present invention, the described polarizer is the crystal polarizer, and described analyzer is the crystal analyzer.
According to the present invention, on contacted two end faces elastomeric pad is housed all between contacted two end faces and described bar shape and the described joint between described bar shape and the described latch mechanism.
Beneficial effect of the present invention is embodied in the following aspects.
(1) the present invention has adopted the force application apparatus of Purely mechanical and has all set up the elastomeric pad that is used to protect optical fiber in the contact site of force application apparatus and tested polarization maintaining optical fibre; compared with prior art; there be not the influence of complementary field to polarization maintaining optical fibre birefringence measurement result; guarantee that tested polarization maintaining optical fibre phenomenon of rupture can not take place in measuring process, and simplified composition structure of the present invention.
(2) the present invention has adopted modular design method, be that whole measuring instrument is made up of three independent sectors, wherein the most of functor in the extinction ratio proving installation is a mature technology, not only reduced design cost of the present invention, but also expanded the range of application of extinction ratio proving installation, simultaneously easy to carry.
(3) selected the light source driving circuit that has integrated circuit control in the extinction ratio proving installation for use, make the luminous power output accuracy of light source reach 0.5%, adopt the crystal polarizer and the crystal analyzer of high precision two-way stepping motor and High Extinction Ratio simultaneously, thereby guaranteed the accuracy of measurement result of the present invention.
Description of drawings
Fig. 1 is the curve map that luminous power changes with acquisition time.
Fig. 2 polarization maintaining fiber beat length measuring apparatus of the present invention is formed synoptic diagram.
Fig. 3 is the light source driving circuit figure in the preferred embodiment of the present invention.
Fig. 4 is that the force application apparatus shown in Fig. 1 is formed synoptic diagram.
Fig. 5 a, Fig. 5 b are that the mechanism that steps up shown in Fig. 3 forms synoptic diagram.
Fig. 6 a, Fig. 6 b are that the displacement mechanism shown in Fig. 3 is formed synoptic diagram.
Fig. 7 is the motor-drive circuit figure in the invention preferred embodiment.
Fig. 8 a, Fig. 8 b are that the pressure regulating device shown in Fig. 3 is formed synoptic diagram.
Fig. 9 is the workflow diagram of Survey Software bag of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and preferred embodiment.
As shown in Figure 2, the preferred embodiment of the present invention comprises light path system, force application apparatus 4, data acquisition and disposal system.Light path system contains light source, the crystal polarizer, condenser lens, crystal analyzer, and wherein, light source, the crystal polarizer, condenser lens are integrated into an extinction ratio proving installation separately.Light source is made of semiconductor laser and light source driving circuit.Analyze by experiment and find, the undulatory property of luminous power is determined jointly by environment temperature and constant current source that mainly in environment temperature was being freezed range of control, constant current source played a major role, and when variation of ambient temperature was big, the latter played a major role.The light source driving circuit of this preferred embodiment is started with from the power environment temperature of constant current source and control semiconductor laser, designed with the integrated chip is the driving circuit of core, thereby send constant power for semiconductor laser provides constant DC source and stable working temperature with driving light source, its detailed circuit is referring to Fig. 3.The stable optical power threshold of test process that guaranteed of light source output power can not exceed the drift of error range, influences test result.The crystal polarizer and crystal analyzer are made by the High Extinction Ratio crystalline material.Condenser lens is installed in the inside of extinction ratio proving installation by a three-dimensional adjustable support, three adjusting knobs that extinction ratio proving installation outside is equipped with light source switch and is connected with three-dimensional adjustable support, the extinction ratio proving installation is connected with an end of tested polarization maintaining optical fibre 3 by fiber adapter 2, and the other end of tested polarization maintaining optical fibre 3 then is connected (length of tested polarization maintaining optical fibre is generally 2m) by another fiber adapter 2 with crystal analyzer 5.Open light source switch, light emitting diode is launched the laser beam of enough power under the driving of light source driving circuit; Light beam forms first linearly polarized light by the crystal polarizer and focuses on by condenser lens; By rotating three adjusting knobs, the focus of condenser lens accurately is positioned on the input end face of fiber adapter 2, first linearly polarized light enters crystal analyzer 5 after by tested polarization maintaining optical fibre 3.When first linearly polarized light beam transmits through tested polarization maintaining optical fibre 3, because force application apparatus radially is applied with pressure with move mode to tested polarization maintaining optical fibre 3 along its length, make tested polarization maintaining optical fibre 3 that elastic deformation take place, thereby cause the polarization characteristic of first linearly polarized light that transmits therein to change, therefore, the light beam of tested polarization maintaining optical fibre 3 outputs no longer is first linearly polarized light beam.And the effect that crystal analyzer 5 is set will make the light beam of crystal analyzer 5 outputs become the linearly polarized light that has identical direction of vibration with first linearly polarized light once more exactly, with what guarantee the light power meter reception is the luminous power of same direction of vibration, correctly reflect the period of change (clap long) of tested polarization maintaining optical fibre 3, guarantee measuring accuracy from linearly polarized light-elliptically polarized light-linearly polarized light.
According to shown in Figure 4, the force application apparatus 4 in this preferred embodiment is an autonomous device, mainly is made of clamp system, displacement mechanism, pressure regulating device, base plate 10.Base plate 10 is square and is made by aluminium.Shown in Fig. 5 a, Fig. 5 b, it is first felt piece 12 of 0.5mm that clamp system contains bar shape 13, two latch mechanisms and thickness.The bottom of bar shape 13 is arranged in longitudinal fluting of base plate 10 and is connected by screw and base plate 10, and its upper surface is with bonding first felt piece 12 of rubber liquid.Latch mechanism contains elbow pressing plate 14, fixed block 16, sells 15 directly to households.On elbow pressing plate 14 1 ends to elbow have U-shaped end cover and pin-and-hole, the other end has downward convex, the bottom in centre position has and the corresponding groove of bar shape 13 width, and groove floor is occupied the second thick felt piece of 0.5mm.Two elbow pressing plates 14 split on bar shape 13 with the spacing of 10cm, the downward convex of each elbow pressing plate 14 is connected on the base plate 10 by screw 11 and its groove is stuck in the both sides of bar shape 13, the U-shaped end of other end cover then is enclosed within the both sides of the fixed block 16 that is connected with base plate 10, overlaps to cooperate with fixed block 16 and is serially connected with selling the 15 U-shaped ends with elbow pressing plate 14 directly to households.Tested polarization maintaining optical fibre 3 wherein one section be placed on first felt piece 12, by set screw 11, second felt piece and first felt piece 12 of elbow pressing plate 14 groove floor are compressed, and guarantee that the tested polarization maintaining optical fibre 3 between two latch mechanisms keeps straight motionless state.
Shown in Fig. 6 a, Fig. 6 b, displacement mechanism comprises two-way stepping motor 27, motor-drive circuit, contain the tooth bar transmission component of spur gear 25 and tooth bar 24, contain the guide assembly of dovetail groove 22 and dovetail 23.Dovetail 23 is connected on the base plate 10 by screw, and its length direction is parallel with the length direction of bar shape 13; Dovetail groove 22 is slidingly matched with dovetail 23.Two-way stepping motor 27 is connected on the base plate 10 by clinching 28, and its transmission shaft and spur gear 25 are connected by pin 26, spur gear 25 and tooth bar 24 engagements, and tooth bar 24 is connected on the upper surface of dovetail groove 22.Fig. 7 shows the motor-drive circuit figure of this preferred embodiment.The major function of this circuit is the test instruction that reception data acquisition and disposal system provide, and drives two-way stepping motor 27 forward and reverse rotations, the rotating speed of control two-way stepping motor 27 and the step-length of definite two-way stepping motor 27.The step-length of stepper motor is an important parameter that directly influences measuring accuracy, and according to the test of many times test, the step-length of the either-rotation motor 27 that the motor-drive circuit of this preferred embodiment is controlled is 0.164mm.Usually, the bat of polarization maintaining optical fibre is long generally in 2～3mm magnitude, and the long algorithm of bat that the present invention adopts is actually that to ask for average bat long, and therefore, the motor-drive circuit of this preferred embodiment and the step value of two-way stepping motor can satisfy high-precision test request fully.
Shown in Fig. 8 a, Fig. 8 b, pressure regulating device contains joint 19, micrometer 20, broken line shape web joint 21 and the 3rd thick felt piece of 0.5mm.The upper surface of joint 19 has blind hole, and the lower surface has and bar shape 13 width corresponding groove, and the side has the pin-and-hole that communicates with blind hole.The 3rd felt piece is bonded in the groove floor of joint 19.Micrometer 20 stands on joint 19 tops, and its telescopic head is inserted in the blind hole of joint 19 and by holding screw and holds out against; The upper end riser and the micrometer 20 of broken line shape web joint 21 are connected, and the middle part transverse slat is sitting in the upper surface of dovetail groove 22, and the lower end vertical plate is connected by the side of trip bolt and dovetail groove 22, and make joint 19 lower end grooves over against bar shape 13.By the top of rotation micrometer 20, its underpart telescopic head drives joint 19 and moves up and down, and can exert pressure to being clipped in the middle tested polarization maintaining optical fibre of the first, the 3rd felt piece thus, and can regulate exerting pressure according to the test needs.Motor-drive circuit receives the steering order of data acquisition processing system output, drive stepping motor 27 is rotated and is driven dovetail groove 22 by tooth bar 24 and slides on dovetail 23, also can drive micrometer 20 thus and step up to move back and forth along tested polarization maintaining optical fibre 3 between the mechanism at two, thus the final function of realization force application apparatus.Because the position that contacts with tested optical fiber in the force application apparatus all is added with felt piece, therefore in test process, tested polarization maintaining optical fibre can not twist or by the phenomenon that joint 19 breaks, can guarantee the integrality of precision of test result or test process.
Referring to Fig. 2, data acquisition and disposal system comprise light power meter 7, contain the computing machine 8 of Survey Software bag again.Light power meter 7 models of this preferred embodiment are PMS-12F, and its measuring accuracy is ± 5%, and resolution reaches 0.001dB, and measurement range is 10pw～1000uw, satisfies test request.The input end of light power meter 7 is connected with crystal analyzer 5 with fiber adapter by optical patchcord 6, and its output terminal is connected with computing machine 8 by cable.Optical patchcord 6 is one section multimode fiber-optic bundle with standard length (normally 1m), mainly plays transmission medium and is connected.In order to reduce the loss of luminous power in light path, at this requirement, selected for use can lossless transmission light wave optical patchcord 6, because optical patchcord 6 has flexibility, help the flexible design of light path simultaneously.The major function of computing machine 8 is, the startup and the stall of control two-way stepping motor 27, and the output signal of gathering light power meter 7, and acquired signal handled accordingly, the bat that finally calculates tested polarization maintaining optical fibre 3 is long.Computing machine 8 built-in testing softwares comprise control module, data acquisition module, parameter module, computing module if divide by function.The voltage signal of data collecting module collected light power meter 7 output also converts digital signal to by A/D.Luminous power extreme value with the step value of two-way stepping motor 27, luminous power extreme value criterion, setting in the parameter module is gathered number.According to the energy loss calculating of light path and the measuring accuracy of light power meter 7, the optical power threshold of determining this preferred embodiment is 165 ± 5%uw, the number of gathering the luminous power extreme value then obtains according to the step-length 0.164mm of two-way stepping motor 27 and the length computation of clamp system, the clamp system length of present embodiment is 10cm, and then gathering number should be between 50～60.Be equipped with in the computing module and clap long computing formula, promptly
In the formula, L
ΔFor the average bat of tested polarization maintaining optical fibre long; T
NFor collection stops constantly; T
1For gathering the zero hour; N is the collection number of luminous power extreme value; S is the step-length of stepper motor.
Fig. 9 shows the workflow of Survey Software bag.Shown in figure, during measurement, the Survey Software bag is carried out following operation steps: the first step, light power meter is carried out initialization, and set test parameter, promptly optical power threshold M and luminous power extreme value are gathered cumulative number X; In second step, send the motor-driven instruction by control module to motor-drive circuit, and pick up counting; In the 3rd step, acquisition module is gathered the output signal of light power meter 7 and is converted digital signal to; In the 4th step, the optical power threshold criterion in the call parameters module is judged current luminous power data, if the luminous power data are more than or equal to the threshold value criterion, then with these luminous power data and moment corresponding T thereof
iPut into the buffer zone of computing machine and extreme value is gathered number and add 1, i=1,2,3 ... N, the circulation aforesaid operations is gathered the extreme value collection cumulative number X that number N equals to set until the luminous power extreme value; The 5th goes on foot, and sends to motor-drive circuit to stop to drive order; The 6th step, the related data in computing module call parameters module and the buffer zone, the average bat that calculates tested polarization maintaining optical fibre 3 is long; In the 7th step, the display of computing machine shows the curve map (referring to Fig. 1) that result of calculation and luminous power change with acquisition time.
To learn by test of many times, this preferred embodiment can reach ± 1% the long measuring accuracy of bat.
Sketch using method of the present invention below in conjunction with this preferred embodiment.
(1) verification
Link to each other with light power meter 7 with the fiber adapter 2 of optical patchcord 6 extinction ratio proving installation 1 output port, open the switch of light source and light power meter 7, pre-on request after thermally-stabilised ten minutes, above and stable if light power meter 7 is output as 300uw, be considered as normally, and keep this state.
(2) debugging
Replace the optical patchcord 6 that is connected between fiber adapter 2 and the light power meter 7 with tested polarization maintaining optical fibre 3, regulate the position of its inner focusing lens, be not less than 150uw until the output valve of light power meter 7 by the adjusting knob on extinction ratio proving installation 1 housing; Being connected between tested polarization maintaining optical fibre 3 output terminals and the light power meter disconnected and be connected with an end of crystal analyzer 5, the other end of crystal analyzer 5 then is connected with light power meter 7 by optical patchcord 6, adjust the analyzing angle of crystal analyzer 5, make that to see through the crystal polarizer consistent with the polarization direction of the linearly polarized light that sees through crystal analyzer 5, open power meter 7 and guarantee that the luminous power that sees through is in maximal value all the time.
(3) force application apparatus is installed
At first, lift the U-shaped end cover of two elbow pressing plates 14, wherein one section anti-putting on the first bonding felt piece 12 of bar shape 13 upper surfaces with tested polarization maintaining optical fibre 3, cooperate with fixed block 16 and be serially connected with selling 15 U-shaped ends covers directly to households then elbow pressing plate 14, by set screw 11, the groove floor and first felt piece 12 of elbow pressing plate 14 are compressed, tested polarization maintaining optical fibre 3 can not be slided or twist.Secondly, regulate the screw rod of micrometer 20, the joint that is connected with its telescopic head is moved down, contact with tested polarization maintaining optical fibre 3 and applied corresponding pressure by test request until the second bonding felt piece of joint bottom groove.
(4) test
Open the power supply of computing machine, by keyboard input test order, computing machine sends driving command to motor-drive circuit, stepper motor 27 entrys into service, and drive micrometer 20 by tooth bar transmission component and guide assembly and move along tested polarization maintaining optical fibre 3, meanwhile, light power meter 7 is gathered through the crystal polarizer, tested polarization maintaining optical fibre 3, optical power signals after 5 transmission of crystal analyzer is also sent into computing machine 8, Survey Software bag in the computing machine is handled accordingly and is calculated the optical power signals of being gathered, though finally draw the curve map of the long and luminous power acquisition time variation of the average bat of tested polarization maintaining optical fibre 3 and shown by display.
Claims (3)
1. polarization maintaining fiber beat length measuring apparatus, comprise light path system, force application apparatus [4], data acquisition and disposal system: described light path system contains light source, the polarizer, condenser lens, analyzer [5] and fiber adapter [2], described fiber adapter [2] is connected with tested polarization maintaining optical fibre [3], the light beam that light source sends is by forming first linearly polarized light behind the polarizer, the line focus lens focus is gone into tested polarization maintaining optical fibre [3] in that the interface end face of fiber adapter [2] is laggard again, described first linearly polarized light changes through its polarization characteristic of tested polarization maintaining optical fibre [3] transmission back because of application of force generation elastic deformation, then becomes second linearly polarized light that identical polarization characteristic is arranged with first linearly polarized light again behind described analyzer [5]; It is characterized in that: described force application apparatus [4] contains clamp system, displacement mechanism, pressure regulating device and base plate [10]: described clamp system contains bar shape [13] and two latch mechanisms that are fixed on the base plate [10], two latch mechanisms split on bar shape [13] with certain spacing, and tested polarization maintaining optical fibre [3] is placed on the upper surface of bar shape [13] and at the mating reaction of bar shape [13] and the latch mechanism straight motionless state of maintenance down; Described displacement mechanism contains two-way stepping motor [27], tooth bar transmission component and guide assembly, fixed part in the guide assembly [23] is connected with described base plate [10], its slipper [22] is connected with the tooth bar [24] of tooth bar transmission component, and two-way stepping motor [27] provides power for the tooth bar transmission component; Described pressure regulating device contains micrometer [20], joint [19] and web joint [21], micrometer [20] stands on joint [19] top and its telescopic head and joint [19] upper end and is connected, the two ends of web joint [21] are connected with the slipper [22] of micrometer [20] and described guide assembly respectively, and the groove that makes joint [19] lower end is over against described bar shape [13]; Rotatablely moving of two-way stepping motor [27] converts translation motion to and drives micrometer [20] by guide assembly upward mobile at tested polarization maintaining optical fibre [3] by the tooth bar transmission component; Described data acquisition and disposal system contain light power meter [7], are built-in with the computing machine [8] of Survey Software bag, and light power meter [7] input end is connected with described analyzer [5] by optical patchcord [6], and output terminal is connected with computing machine [8] by cable; Described Survey Software includes control module, data acquisition module, gather the parameter module of cumulative number with two-way stepping motor step-length, luminous power extreme value criterion and luminous power extreme value, be equipped with the computing module of beat length of polarization maintaining optical fiber algorithm, the major function of this software is, the operation of control two-way stepping motor [27] with stop, the luminous power extreme value of gathering light power meter [7] output also writes down its moment corresponding, the average bat that calculates tested polarization maintaining optical fibre [3] according to formula is long.
2. polarization maintaining fiber beat length measuring apparatus according to claim 1 is characterized in that: the described polarizer is the crystal polarizer, and described analyzer [5] is the crystal analyzer.
3. polarization maintaining fiber beat length measuring apparatus according to claim 1 and 2 is characterized in that: on contacted two end faces elastomeric pad is housed all between contacted two end faces and described bar shape [13] and the described joint [19] between described bar shape [13] and the described latch mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100187554A CN100557399C (en) | 2007-09-28 | 2007-09-28 | Polarization maintaining fiber beat length measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100187554A CN100557399C (en) | 2007-09-28 | 2007-09-28 | Polarization maintaining fiber beat length measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101236127A CN101236127A (en) | 2008-08-06 |
| CN100557399C true CN100557399C (en) | 2009-11-04 |
Family
ID=39919903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100187554A Active CN100557399C (en) | 2007-09-28 | 2007-09-28 | Polarization maintaining fiber beat length measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100557399C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710023B (en) * | 2009-11-12 | 2011-01-12 | 北京航空航天大学 | Method and device for testing polarization maintaining fiber beat length |
| CN107976300A (en) * | 2017-11-15 | 2018-05-01 | 苏州润桐专利运营有限公司 | A kind of measuring method of beat length of polarization maintaining optical fiber |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338691A (en) * | 2010-07-16 | 2012-02-01 | 北京国科世纪激光技术有限公司 | Optical parameter measuring device and measuring method of extinction ratio |
| CN102466559A (en) * | 2010-11-11 | 2012-05-23 | 北京国科世纪激光技术有限公司 | Method for measuring extinction ratio of magneto-optical isolator, and device for measuring optical parameter |
| CN102183360B (en) * | 2011-03-04 | 2015-09-30 | 天津大学 | The detection method of polarization extinction ratio of optical polarizer and pick-up unit |
| CN103364175B (en) * | 2012-04-06 | 2016-02-10 | 德逸时代(天津)科技有限公司 | A kind of passive tester based on circular motion image data |
| CN106033023B (en) * | 2015-03-16 | 2019-09-27 | 中国科学院西安光学精密机械研究所 | Polarization maintaining optical fiber beat length measuring method and system |
| CN107544113A (en) * | 2017-10-20 | 2018-01-05 | 上海理工大学 | Optical switch device based on Helical Fiber |
| CN108398242B (en) * | 2018-01-31 | 2019-11-26 | 北京交通大学 | The measuring device and method of elliptical polarization holding optical fiber extinction ratio |
| CN115585985B (en) * | 2022-10-19 | 2023-08-18 | 深圳市新联恒光电科技有限公司 | Performance index monitoring system suitable for polarization maintaining fiber device |
-
2007
- 2007-09-28 CN CNB2007100187554A patent/CN100557399C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710023B (en) * | 2009-11-12 | 2011-01-12 | 北京航空航天大学 | Method and device for testing polarization maintaining fiber beat length |
| CN107976300A (en) * | 2017-11-15 | 2018-05-01 | 苏州润桐专利运营有限公司 | A kind of measuring method of beat length of polarization maintaining optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101236127A (en) | 2008-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100557399C (en) | Polarization maintaining fiber beat length measuring apparatus | |
| CN102183360B (en) | The detection method of polarization extinction ratio of optical polarizer and pick-up unit | |
| CN100476387C (en) | System for detecting polarization maintaining optical fiber beat length | |
| CN101349576A (en) | Optical fiber position digital encoder and uses thereof | |
| CN106989712B (en) | A kind of high-precision Self-resetting probe-type displacement measuring device and measuring method | |
| CN103616127B (en) | Trace to the source caliberating device and the source tracing method of micro-cantilever elastic constant | |
| CN101949685A (en) | Fiber laser self-mixing interferometer and measurement method thereof | |
| CN110186363A (en) | A kind of flatness inspection devices and measurement method | |
| CN102235887A (en) | Device for measuring ground settlement | |
| CN109425314A (en) | A method of track plates angularity is detected using laser displacement range measurement principle | |
| CN202748273U (en) | Leather property index testing instrument | |
| CN102589848B (en) | System for testing optical thin film damage threshold | |
| CN109357607A (en) | A kind of full-automatic calibrating device for vibrating string type strain transducer | |
| CN1137370C (en) | Image-type automatic calibrating instrument for micrometer gauge or dial gauge | |
| CN102538954B (en) | Vibration verification device based on linear motor and vibration detecting method thereof | |
| CN103438816A (en) | High-precision measuring device for measuring joint type equipment member bar deformation | |
| GB2337815A (en) | Thickness meter for thin transparent objects | |
| CN1912564A (en) | Partial fibre-optical passive tester and its application | |
| CN202442689U (en) | Displacement monitoring device | |
| CN201203966Y (en) | Demonstration apparatus for optical rotation experiment | |
| CN102313594B (en) | Detection device with different diffraction angle light intensity distributions | |
| CN208653442U (en) | Non-contact type device for detecting deflection angle of roller wire | |
| CN208833411U (en) | Parameter test system is lost in actuator | |
| CN202350703U (en) | Small range contacting two-dimensional displacement measuring tool | |
| CN202471239U (en) | Vibration calibrating device based on linear motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |