CN105659814B - A kind of closed-loop fiber optic gyroscope and light path implementation method of full light path weldless point - Google Patents
A kind of closed-loop fiber optic gyroscope and light path implementation method of full light path weldless pointInfo
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- CN105659814B CN105659814B CN200910122254.XA CN200910122254A CN105659814B CN 105659814 B CN105659814 B CN 105659814B CN 200910122254 A CN200910122254 A CN 200910122254A CN 105659814 B CN105659814 B CN 105659814B
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- lithium niobate
- tail optical
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- 239000000835 fiber Substances 0.000 title claims abstract description 144
- 239000003365 glass fiber Substances 0.000 claims abstract description 401
- GQYHUHYESMUTHG-UHFFFAOYSA-N Lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 111
- 238000005498 polishing Methods 0.000 claims abstract description 63
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 230000004927 fusion Effects 0.000 claims abstract description 13
- 230000001808 coupling Effects 0.000 claims abstract description 12
- 230000003287 optical Effects 0.000 claims description 32
- 239000003292 glue Substances 0.000 claims description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 230000001105 regulatory Effects 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000007499 fusion processing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 16
- 238000003466 welding Methods 0.000 description 11
- 239000000758 substrate Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000006880 cross-coupling reaction Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 235000020127 ayran Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229920000591 gum Polymers 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000051 modifying Effects 0.000 description 1
- 230000003071 parasitic Effects 0.000 description 1
- 229910052904 quartz Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
A kind of closed-loop fiber optic gyroscope of full light path weldless point, its light path comprises light source, photo-detector, two Y waveguide integrated optics device lithium niobate chips and polarization-maintaining fiber coil, light source, photo-detector tail optical fiber are of coupled connections with one of them Y waveguide integrated optics device lithium niobate chip respectively, another Y waveguide integrated optics device lithium niobate chip is connected with polarization-maintaining fiber coil pigtail coupling, and two Y waveguide integrated optics device lithium niobate chips are of coupled connections by a polarization maintaining optical fibre. Its light path implementation method, comprises polarization-preserving fiber axis fixing, fixing, polishing; Preparation and the end face polishing of Y waveguide integrated optics device lithium niobate chip; Being of coupled connections of light source, photo-detector tail optical fiber, polarization-maintaining fiber coil tail optical fiber and polarization maintaining optical fibre and two Y waveguide integrated optics device lithium niobate chips. In the present invention, eliminate all fusion points of fiber-optic gyroscope light path, in fusion process to axle inaccurate and that cause polarization interference can be avoided, improve the performance of optical fibre gyro further; In addition, owing to eliminate fusion point, the reliability of optical fibre gyro is also improve.<pb pnum="1" />
Description
Technical field
The present invention relates to a kind of closed-loop fiber optic gyroscope and light path implementation method thereof of weldless point, belong to inertia apparatusTable field.
Background technology
Optical fibre gyro is a kind of all solid state instrument of utilizing optics Sagnac effect to detect rotational angular velocity,Have that volume is little, lightweight, movement-less part, flexible design, accuracy rating are wide, high reliability,Thus obtain general concern. Optical fibre gyro has been widely used in sky, land, sea and air multiple fields at present.
Open-loop optical fiber gyro and closed-loop fiber optic gyroscope can be divided into according to signal detecting mode optical fibre gyro. WhereinPerson generally adopts Y waveguide integrated optical device to realize the closed-loop control of optical fibre gyro. During optical fibre gyro work,By applying voltage and produced a nonreciprocal phase shift by electrooptic effect on Y waveguide device, be used for compensating forSagnac phase shift, therefore no matter the speed of rotation is how many, total between the light wave of suitable counter-clockwise direction propagationPhase difference is always constant value. Measure the nonreciprocal phase shift that meets this condition as gyrostatic output. Closed loopOptical fibre gyro is linear to the response of the speed of rotation substantially, adopts Y waveguide integrated optical device at presentClosed-loop fiber optic gyroscope has become the mainstream scheme of optical fibre gyro.
At present to comprise light source, detector, fiber coupler, Y waveguide many for common closed-loop fiber optic gyroscope light pathFunction i ntegration optics, the large main components of fiber optic loop five, the mutual welding by tail optical fiber between them connectsConnect and form gyro light path. There is following problem in such light path connected mode:
(1) owing to there is optical fiber fusion welding point in light path, can there is larger stress in fusion point place, become light pathIn weak link, have impact on the reliability of optical fibre gyro.
(2) because fiber optic loop generally adopts polarization maintaining optical fibre to reduce the polarization error of gyro, therefore at Y rippleLead in the inclined to one side tail optical fiber of guarantor of integrated optical device and the process of polarization-maintaining fiber coil tail optical fiber welding, exigent to axlePrecision. But in being carried out fusion process by Polarization Maintaining Optical Fiber Fusion Splicer, reality is difficult to guarantee to axle precision, andCannot detect axle deviation, thus the polarization error of optical fibre gyro effectively cannot be controlled, affect optical fibre gyroOverall performance. If the tail optical fiber of fiber optical gyroscope and fiber optic loop are dissimilar polarization maintaining optical fibre,This problem is more serious, this restrict optical fibre gyro to more high-precision development.
(3) fiber coupler more generally adopts the method for fused biconical taper to be prepared at present, due in technique mistakeCheng Zhong, optical fiber is easy to residual stress in process that high-temperature process returns to normal temperature again, and the intensity of optical fiber becomesWeak. Although fused biconical taper part all can be protected with elastic gum and quartz socket tube, but still is optic fibre light pathIn weak link, under the effect of the external force such as vibration, impact, be easy to occur the fracture of optical fiber, impactThe reliability of optical fibre gyro.
About the light path design of optical fibre gyro, also someone proposed to carry out structure with two Y waveguide integrated optical devicesBecome the reciprocity light channel structure of closed-loop fiber optic gyroscope, two Y waveguide integrated optical device structures of using the earliest asShown in Fig. 2, do not use fiber coupler in such a configuration, avoid the weak link in light path, but byBe connected in the single-ended of Liang Ge Y branch, the radiation coupling of " the 4th port " in Y branch can be coupled intoIn gyro light path, cause gyro noise, affect the zero stability of optical fibre gyro.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provides a kind of precision high, reliableProperty is good, closed-loop fiber optic gyroscope and the light path implementation method of the full light path weldless point of good stability, weldless point.
Technical solution of the present invention is: a kind of closed-loop fiber optic gyroscope of full light path weldless point, light path bagDraw together light source, photo-detector, the first Y waveguide integrated optics device lithium niobate chip, the second Y waveguide Integrated LightLearn device lithium niobate chip, polarization-maintaining fiber coil and polarization maintaining optical fibre, the first Y waveguide integrated optics device lithium niobateThe end face polishing of chip and the second Y waveguide integrated optics device lithium niobate chip, polarization-maintaining fiber coil first,Tail optical fiber II, I end of the tail optical fiber of two end tail optical fibers, light source, the tail optical fiber of photo-detector and polarization maintaining optical fibre is fixing respectivelyFirst, second, third and fourth, five and six fibers fixed block on, by first and second end tail optical fiber of polarization-maintaining fiber coil,The tail optical fiber of light source, the tail optical fiber of photo-detector and polarization maintaining optical fibre tail optical fiber II, I end and first, second, third and fourth,Five polishings together with six fibers fixed block, first end tail optical fiber and the first optical fiber fixed block polishing of polarization-maintaining fiber coilAngle is consistent with the second Y waveguide integrated optics device lithium niobate chip polishing angle direction, the tail of photo-detectorFibre and the 4th optical fiber fixed block polishing angle and the first Y waveguide integrated optics device lithium niobate chip polishing angleDirection is consistent, and Y waveguide integrated optics device lithium niobate chip end face polishing angle beta and optical fiber and optical fiber are fixedThe pass of the polishing angle [alpha] of piece isWherein n1For Y waveguide integrated optical device niobiumThe refractive index of acid lithium chip, n2For the refractive index of optical fiber;
First and second output of the first Y waveguide integrated optics device lithium niobate chip respectively with the tail optical fiber of light sourceAnd tail optical fiber and the 4th optical fiber fixed block of the 3rd optical fiber fixed block, photo-detector are of coupled connections, the second Y waveguideFirst and second output of integrated optics device lithium niobate chip respectively with first and second tail optical fiber of polarization-maintaining fiber coilAnd first and second optical fiber fixed block is of coupled connections, and tail optical fiber II, I of polarization maintaining optical fibre end and the 5th, six fibers are solidDetermine piece respectively with input, the first Y waveguide Integrated Light of the second Y waveguide integrated optics device lithium niobate chipThe input of learning device lithium niobate chip is of coupled connections, and does not have the welding of optical fiber in whole fiber-optic gyroscope light pathPoint.
A closed-loop fiber optic gyroscope light path implementation method for full light path weldless point, is realized by following steps:
The first step, to first and second end tail optical fiber dead axle of polarization-maintaining fiber coil, identifies its stress axis, polarisation will be protectedFirst and second end tail optical fiber of fine ring is according to the side of slow axis perpendicular to the holddown groove bottom surface of first and second optical fiber fixed blockTo being fixed on first and second optical fiber fixed block;
Second step, is fixed on the tail optical fiber of the tail optical fiber of light source and photo-detector on third and fourth optical fiber fixed block;
3rd step, to tail optical fiber I and the II end dead axle of polarization maintaining optical fibre, identifies the stress axis at its two ends, by tail optical fiberI and II end according to slow axis perpendicular to the direction of the holddown groove bottom surface of the 6th, five optical fiber fixed blocks be fixed on the 6th,On five optical fiber fixed blocks;
4th step, prepare first, second Y waveguide integrated optics device lithium niobate chip and by its end face by throwingAngular β polishing;
5th step, by the optical fiber pigtail described in the first step, second step and the 3rd step and the polishing of optical fiber fixed block,By the polishing of polishing angle [alpha], Y waveguide integrated optics device lithium niobate chip end face polishing angle beta and optical fiber andThe pass of the polishing angle [alpha] of optical fiber fixed block isWherein n1For Y waveguide Integrated LightLearn the refractive index of device lithium niobate chip, n2For the refractive index of optical fiber;
6th step, divides the first output and the input of the first Y waveguide integrated optics device lithium niobate chipOther and the tail optical fiber of light source and the tail optical fiber I of the 3rd optical fiber fixed block and polarization maintaining optical fibre hold and six fibers fixed block couplingClose connection;
7th step, by the second output and the photo-detector of the first Y waveguide integrated optics device lithium niobate chipTail optical fiber and the 4th optical fiber fixed block be of coupled connections;
8th step, divides the first output and the input of the second Y waveguide integrated optics device lithium niobate chipDo not hold with the first end tail optical fiber of polarization-maintaining fiber coil and the tail optical fiber II of the first optical fiber fixed block and polarization maintaining optical fibre and the 5thOptical fiber fixed block is of coupled connections;
9th step, by integrated to the second end tail optical fiber of polarization-maintaining fiber coil and the second optical fiber fixed block and the second Y waveguideThe second output of optics lithium niobate chip is of coupled connections, and realizes the closed-loop fiber optic gyroscope light of weldless pointRoad.
Principle of the present invention is:
In original fiber-optic gyroscope light path implementation method, the tail of Y waveguide integrated optics device lithium niobate chipFine and fiber optic loop is linked together by the mode of tail optical fiber welding, for polarization maintaining optical fibre fiber optic loop, fused fiber spliceTime need to ensure that polarization axle is aimed at, when using heat sealing machine welding, strict aligning is impossible, alwaysHave the error of 1 ~ 2 °, alignment error will produce polarization coupled, when alignment error angle is θ, and Coupling pointThe Jones matrix of (fusion point) can be expressed as
From above formula, the coupling power of each Coupling point is than being ρc＝sin2θ; In the hypothesis incident of Coupling point placeLight strictly aim at a polarization axle of optical fiber, then after fusion point, extinction ratio is:ER＝-10log(tan2θ). If when deviation of the alignment is respectively 1 ° and 2 °, then ER be respectively 35dB and29dB。
General Requirements is greater than 30dB from the extinction ratio of Y waveguide integrated optical device tail optical fiber, due to fused fiber spliceThe point cross-linked existence in place, the extinction ratio in fiber optic loop can far below the extinction ratio of waveguide tail optical fiber. For oneIndividual length is the fiber optic loop of 200m, and its intrinsic extinction ratio can reach 30dB, but when its one end and delustringWhen carrying out welding than the waveguide tail optical fiber that is greater than 30dB, even can from the extinction ratio that the other end of fiber optic loop measuresTo be reduced to 20dB. Visible optical fiber fusion welding point is can not be ignored for the impact of polarization cross coupling in fiber optic loop, and if consider another fusion point, then polarization cross coupling can be larger, and gyro polarization error is alsoLarger.
Adopt the solution of the present invention, then eliminate the fusion point of fiber optic loop and waveguide tail optical fiber. Then can be understood as" welding " some place, completely accurately to axle, is 0 to axis error θ. While optical fiber and waveguide still can accurately to axlesCoupling, the light entering in optical fiber from waveguide-coupled still has the extinction ratio of more than 30dB, due in fiber optic loop onlyHave the polarization cross coupling of optical fiber self, its value is very little, and then the extinction ratio in fiber optic loop can keep substantiallyAt 30dB, the polarization error of gyro can be reduced greatly.
The Y waveguide integrated optics device lithium niobate chip that this programme adopts adopts process annealing proton exchange processPreparation, does not exist in the process as the material molten process in fiber coupler preparation, optical waveguide substrates itselfThe still original crystalline state of basic maintenance, internal stress is little, and large vibratory impulse can be tolerated. Therefore weCase is compared with the scheme that adopts fiber coupler, and gyro has higher reliability.
Owing to adopting two Y waveguide integrated optics device lithium niobate chips, and between them, pass through to protect polarisationBetween fibre, connect, in optical waveguide substrates, the light of " the 4th port " scattering can not be coupled in waveguide, and then also notCan be coupled in another Y waveguide light path, therefore this scheme also effectively overcomes " the 4th port " scattered lightImpact, improves the performance of gyro.
The present invention compared with prior art beneficial effect is:
(1) light source of the present invention, photo-detector, fiber optic loop tail optical fiber respectively with two Y waveguide Integrated LightsDevice lithium niobate chip is of coupled connections, and between two chips, is also of coupled connections by a polarization maintaining optical fibre,Therefore in whole gyro light path, except only several be of coupled connections a little, non-existent welding on optical fiberPoint, substantially increase the reliability of gyro;
(2) the present invention is owing to there not being optical fiber fusion welding point, in assembling process without the need to carrying out fused fiber splice, thereforeCompletely eliminate optical fiber problem inaccurate to axle in fusion process, meanwhile, it is solid that polarization maintaining optical fibre is fixed to optical fiberDead axle precision before determining piece is very high, and aiming at optical fiber slow axis and chip polarization direction between effectively can be guaranteed,Therefore, the polarization error of optical fibre gyro significantly can be reduced, improve the precision of optical fibre gyro;
(3) the present invention adopts Y waveguide integrated optics device lithium niobate chip to instead of the light in conventional schemeFine coupler, thoroughly overcome optical fibre coupler in process of fused biconical taper district bad mechanical strength to optical fibre gyro bring canBy property hidden danger, improve the reliability of optical fibre gyro further;
(4) light path implementation method of the present invention adopts high-precision optical fiber dead axle, effectively controls the polarization in light pathCross-couplings, ensure that the precision of optical fibre gyro;
(5) light source, the photo-detector that in light path implementation method of the present invention, adopt optical fibre gyro intrinsic, carry out realityTime signal monitoring, workable, and the gyro signal strength signal intensity in when work directly can be assessed, be convenient to dressJoin the optical path loss control of process;
(6) light path implementation method of the present invention adopts special polishing angle, effectively reduces in light path dorsadReflecting background;
(7) the present invention adopts optical fiber fixed block to be connected with chip connection together with optical fiber, and optical fiber fixed blockPolishing together with optical fiber, increases the area of coupling, improves the quality being of coupled connections;
(8) the present invention adopts two Y waveguide integrated optics device lithium niobate chips, and logical between themCross between polarization maintaining optical fibre and connect, in optical waveguide substrates, the light of " the 4th port " scattering can not be coupled in waveguide,And then also can not be coupled in another Y waveguide light path, therefore effectively overcome " the 4th port " shadow of scattered lightRing, improve the performance of gyro;
(9) the Y waveguide integrated optics device lithium niobate chip that the present invention adopts adopts process annealing proton to hand overChange technique preparation, optical waveguide substrates itself is the original crystalline state of basic maintenance still, and internal stress is little, Neng GounaiBe subject to large vibratory impulse, than adopting the gyro of fiber coupler to have higher reliability.
Accompanying drawing explanation
Fig. 1 is fiber-optic gyroscope light path schematic diagram of the present invention;
Fig. 2 is existing pair of Y waveguide integrated optical device structure chart;
Fig. 3 is polarization-preserving fiber axis fixing schematic diagram of the present invention;
View a after Fig. 4 is polarization maintaining optical fibre of the present invention and the polishing of optical fiber fixed block;
View b after Fig. 5 is polarization maintaining optical fibre of the present invention and the polishing of optical fiber fixed block.
View a after Fig. 6 is Y waveguide integrated optical device chip of the present invention polishing;
View b after Fig. 7 is Y waveguide integrated optical device chip of the present invention polishing.
Detailed description of the invention
As shown in Figure 1, its light path comprises light source 1, optical detection to the closed-loop fiber optic gyroscope of full light path weldless pointDevice 2, the first Y waveguide integrated optics device lithium niobate chip 3, the second Y waveguide integrated optical device niobic acidThe output 8 of lithium chip 4 and polarization-maintaining fiber coil 5, first Y waveguide integrated optics device lithium niobate chip 3The first Y waveguide integrated optical device is connected with tail optical fiber 6 and optical fiber fixed block 19 direct-coupling of light source 1The output 9 of lithium niobate chip 3 connects with the tail optical fiber 7 of photo-detector 2 and optical fiber fixed block 20 direct-couplingConnect the tail optical fiber 10 of polarization-maintaining fiber coil 5 and optical fiber fixed block 17 and the second Y waveguide integrated optical device niobic acidThe output 12 of lithium chip 4 is of coupled connections, the tail optical fiber 11 of polarization-maintaining fiber coil 5 and optical fiber fixed block 18 withThe output 13 of the second Y waveguide integrated optics device lithium niobate chip 4 is of coupled connections, the first Y waveguide collectionBecome input 14 and the second Y waveguide integrated optics device lithium niobate chip 4 of optics lithium niobate chip 3Input 15 connected by a polarization maintaining optical fibre 16, the tail optical fiber I of polarization maintaining optical fibre 16 end and optical fiber are fixedThe input 14 of piece 22 and the first Y waveguide integrated optics device lithium niobate chip 3 is of coupled connections, and protects polarisationFine 16 tail optical fiber II end and optical fiber fixed block 21 and the second Y waveguide integrated optics device lithium niobate chip 4Input 15 is of coupled connections. The fusion point of optical fiber is there is not in the light path of whole closed-loop fiber optic gyroscope.
The first Y waveguide integrated optics device lithium niobate chip 3 and the second Y waveguide integrated optics device lithium niobateThe end face polishing of chip 4, the tail optical fiber 6 of light source 1, the tail optical fiber 7 of photo-detector 2, polarization-maintaining fiber coil 5Tail optical fiber I, II end of tail optical fiber 10,11 and polarization maintaining optical fibre 16 be separately fixed at optical fiber fixed block 19,20,17, on 18,22 and 21, by the tail optical fiber of light source 16, the tail optical fiber 7 of photo-detector 2, polarization-maintaining fiber coilTogether with the optical fiber fixed block of 5 tail optical fiber 10,11 and tail optical fiber I, II of polarization maintaining optical fibre 16 end and each self-retainingPolishing, tail optical fiber 10 and optical fiber fixed block 17 polishing angle and second Y waveguide of polarization-maintaining fiber coil 5 are integratedOptics lithium niobate chip 4 polishing angle direction is consistent, and tail optical fiber 7 and the optical fiber thereof of photo-detector 2 are fixedPiece 20 polishing angle is consistent with the first Y waveguide integrated optics device lithium niobate chip 3 polishing angle direction, YThe polishing angle of wave-guide integrated optics device lithium niobate chip end face polishing angle beta and optical fiber and optical fiber fixed blockThe pass of α isWherein n1For the refraction of Y waveguide integrated optics device lithium niobate chipRate, n2For the refractive index of optical fiber.
First and second Y waveguide integrated optics device lithium niobate chip 3,4 adopts process annealing proton exchange workSkill preparation, do not exist in the process as the material molten process in fiber coupler preparation, optical waveguide substrates originallyBody still keeps original crystalline state substantially, and internal stress is little, and large vibratory impulse can be tolerated. In light pathThe first Y waveguide integrated optics device lithium niobate chip 3 as photo-coupler, only for the beam splitting of light, closeAn inclined to one side analyzing function of bundle and optical signal, the second Y waveguide integrated optics device lithium niobate chip 4 closesRing feedback use, except having the function of the first Y waveguide integrated optics device lithium niobate chip 3, also has electricityThe function of light phase modulation, realizes the closed-loop control of closed-loop fiber optic gyroscope whereby.
As shown in Figure 3, end face has trapezoidal holddown groove and is used for installing light optical fiber fixed block 17 ~ 22 thereonFibre, one side end face angle polishing as shown in Figure 4,5.
The mode being of coupled connections is formal dress coupling, namely Waveguide end face and optical fiber and fixed block end face directly bonding,And each tail optical fiber is mutually independent.
The closed-loop fiber optic gyroscope light path implementation method of full light path weldless point, is realized by following steps:
One, dead axle
Polarization maintaining fiber pigtail dead axle is as shown in Figure 3, by the tail optical fiber of polarization-maintaining fiber coil 5 10 and optical fiber fixed block17 difference clampings, on fixture, are observed under being then put in microscope, tail optical fiber 10 end face can be observedOn stressed zone distribution, rotate optical fiber, make the slow axis 23 of optical fiber perpendicular to the holddown groove of optical fiber fixed block 17Bottom surface, tail optical fiber 10 is pressed in holddown groove, then some glue on tail optical fiber 10, makes tail optical fiber 10 with fine solidDetermine piece 17 to be bonded together. In Fig. 3 only taking the tail optical fiber 10 of polarization-maintaining fiber coil 5 and optical fiber fixed block 17 asExample illustrates the process of polarization maintaining fiber pigtail dead axle, and remaining polarization maintaining fiber pigtail dead axle principle is identical, at this justDo not repeat one by one.
To two of polarization-maintaining fiber coil 5 tail optical fiber 10 and 11 dead axles, identify its stress axis, by polarization-maintaining fiber coil5 tail optical fiber 10 and 11 is solid perpendicular to the direction of the holddown groove bottom surface of optical fiber fixed block 17 and 18 according to slow axisFix on optical fiber fixed block 17 and 18; To tail optical fiber I and the II end dead axle of polarization maintaining optical fibre 16, identify its twoThe stress axis of end, and according to the direction difference of slow axis perpendicular to the holddown groove bottom surface of optical fiber fixed block 22 and 21Be fixed on optical fiber fixed block 22 and 21.
The tail optical fiber 7 of the tail optical fiber of light source 16 and photo-detector 2 is generally to ordinary optic fibre, only need be fixedOn optical fiber fixed block 19 and 20. The tail optical fiber 6 of light source 1 also can be selected polarization maintaining optical fibre, to the tail of light source 1Fine 6 dead axles, identify its stress axis, and according to slow axis perpendicular to the holddown groove bottom surface of optical fiber fixed block 19Direction is fixed on optical fiber fixed block 19.
The dead axle precision of polarization-preserving fiber axis fixing is in order to ensure that in subsequent coupling process, polarization maintaining optical fibre slow axis and waveguide are inclined to one sideStrict aligning between polarization state. The dead axle precision of polarization-preserving fiber axis fixing should be guaranteed within the scope of ± 1.5 °, according toSuch dead axle accuracy computation, from optical waveguide coupled enter the extinction ratio of optical signal of optical fiber be:ER＝-10log(tan21.5 °), it is 32dB that extinction ratio can be calculated, and gyro requirement can be met.
Two, Y waveguide integrated optics device lithium niobate chip is prepared
Prepare first, second Y waveguide integrated optics device lithium niobate chip 3,4 and by its end face polishing,Form shape as is seen in fig. 6 or fig. 7, the polishing angle beta of Y waveguide integrated optics device lithium niobate chipGenerally get 8 ° or 10 °, mismachining tolerance is ± 0.5 °.
Three, polishing fiber tail optical fiber and optical fiber fixed block
By tail optical fiber I and II end, the light source of two tail optical fibers of polarization-maintaining fiber coil 5 10 and 11, polarization maintaining optical fibre 161 tail optical fiber 6 with the tail optical fiber 7 of photo-detector 2 together with the optical fiber fixed block polishing bonding with them. WithTwo tail optical fibers 10 and 11 of polarization-maintaining fiber coil 5 illustrate for example, and all the other in like manner just do not repeat one by one at this.
As shown in Figure 4, the tail optical fiber 10 of polarization-maintaining fiber coil 5 is pressed α angle polishing together with optical fiber fixed block 17,As shown in Figure 5, the tail optical fiber 11 of polarization-maintaining fiber coil 5 is pressed α angle polishing together with optical fiber fixed block 18, throwsThe object one of light is to reduce the scattering of fiber end face light, improves the coupling efficiency of optical fiber and waveguide, reduces light pathLoss; Two is to carry out polishing according to certain angle alpha, and the reverberation at Coupling point place can be avoided again to be coupled intoIn waveguide, the parasitic interaction that forms reverberation causes gyro noise. Certain angle alpha is by formulaDetermine, wherein n1For the refractive index of Y waveguide integrated optics device lithium niobate chip,n2For the refractive index of optical fiber. As β gets 10 °, the refractive index n of waveguide1=2.2, the refractive index n of optical fiber2For=1.5,It is 15 ° that substitution above formula can obtain α, and now reflect and is reduced to 60dB at Coupling point place. Optical fiber and optical fiber fixed blockMismachining tolerance be ± 0.5 °.
Tail optical fiber 10 and optical fiber fixed block 17 and tail optical fiber 11 and optical fiber fixed block 18 polishing of polarization-maintaining fiber coil 5Angle is contrary, and the tail optical fiber 6 of light source 1 and the tail optical fiber 7 of optical fiber fixed block 19 and photo-detector 2 and optical fiber are solidDetermine piece 20 polishing angle contrary.
Tail optical fiber 10 and optical fiber fixed block 17 polishing angle and the Y waveguide integrated optics device of polarization-maintaining fiber coil 5Part lithium niobate chip 4 polishing angle direction is consistent, tail optical fiber 7 and the optical fiber fixed block 20 thereof of photo-detector 2Polishing angle is consistent with Y waveguide integrated optics device lithium niobate chip 3 polishing angle direction. If Y waveguideIntegrated optics device lithium niobate chip 3 and 4 carries out polishing, then polarization-maintaining fiber coil 5 by angle as shown in Figure 6Tail optical fiber 10, the tail optical fiber 7 of photo-detector 2 by angle shown in Fig. 4, polishing need be carried out, polarization-maintaining fiber coil 5The tail optical fiber 6 of tail optical fiber 11, light source 1 need by carrying out polishing shown in Fig. 5; As fruit chip is pressed angle as shown in Figure 7Degree polishing, then the tail optical fiber 7 of tail optical fiber 10, the photo-detector 2 of tail optical fiber polarization-maintaining fiber coil 5 needs press angle shown in Fig. 5Degree carries out polishing, and the tail optical fiber 11 of polarization-maintaining fiber coil 5, the tail optical fiber 6 of light source 1 need by carrying out polishing shown in Fig. 4;And for I and the II end of polarization maintaining optical fibre 16, no matter which kind of situation, all can be polished to Fig. 4 or Fig. 5 instituteThe angle of showing.
Four, be of coupled connections
1, by the output of the first Y waveguide integrated optics device lithium niobate chip 38 and input 14 differenceBe of coupled connections with the tail optical fiber 6 of light source 1 and the tail optical fiber I of polarization maintaining optical fibre 16 end.
Add drive source to light source 1, make it in running order; The tail optical fiber of light source 16 and optical fiber are fixedTail optical fiber I end and the optical fiber fixed block 22 of piece 19 and polarization maintaining optical fibre 16 are placed on sextuple fine adjustment frame, makeThe tail optical fiber 6 of light source 1 is aimed at the output 8 of the first Y waveguide integrated optics device lithium niobate chip 3, protectsThe tail optical fiber I end of polarisation fibre 16 is right with the input 14 of the first Y waveguide integrated optics device lithium niobate chip 3Standard, the tail optical fiber II termination of polarization maintaining optical fibre 16 enters light power meter; Light source 1 is regulated by sextuple fine adjustment frameThe tail optical fiber I end of tail optical fiber 6 and polarization maintaining optical fibre 16 and the first Y waveguide integrated optics device lithium niobate chip 3Position, makes the luminous power maximum that the light power meter of the tail optical fiber II termination of polarization maintaining optical fibre 16 detects; By light source 1Tail optical fiber 6 and the tail optical fiber I end of optical fiber fixed block 19 and polarization maintaining optical fibre 16 and optical fiber fixed block 22 respectively withThe first Y waveguide integrated optics device lithium niobate chip 3 end face carries out a glue to be fixed, and realizes and the first Y waveguideBeing of coupled connections of integrated optics device lithium niobate chip 3.
2, by the output of the first Y waveguide integrated optics device lithium niobate chip 39 and photo-detector 2Tail optical fiber 7 is of coupled connections.
Add drive source to photo-detector 2, make it in running order; By the tail optical fiber of photo-detector 27 together withOptical fiber fixed block 20 is placed on sextuple fine adjustment frame together, makes tail optical fiber 7 and a Y of photo-detector 2The output 9 of wave-guide integrated optics device lithium niobate chip 3 is aimed at; From the tail optical fiber II end of polarization maintaining optical fibre 16Input optical power, is regulated tail optical fiber 7 and the first Y waveguide Integrated Light of photo-detector 2 by sextuple fine adjustment frameLearn the position of device lithium niobate chip 3, make the luminous power maximum receiving from photo-detector 2; Light is visitedSurvey the tail optical fiber 7 of device 2 and optical fiber fixed block 20 and the first Y waveguide integrated optics device lithium niobate chip 3 endFace is carried out a glue and is fixed, and realization is of coupled connections with the first Y waveguide integrated optics device lithium niobate chip 3.
3, by 15 points of the output of the second Y waveguide integrated optics device lithium niobate chip 4 12 and inputsOther and the tail optical fiber 10 of polarization-maintaining fiber coil 5 and the tail optical fiber II of polarization maintaining optical fibre 16 end are of coupled connections.
Add drive source to light source (1), make it in running order; By the tail optical fiber of polarization-maintaining fiber coil 5 10And the tail optical fiber II end of optical fiber fixed block 17 and polarization maintaining optical fibre 16 and optical fiber fixed block 21 are placed on sextuple fine settingOn frame, make the tail optical fiber 10 of polarization-maintaining fiber coil 5 and the second Y waveguide integrated optics device lithium niobate chip 4Output 12 is aimed at, tail optical fiber II end and the second Y waveguide integrated optics device lithium niobate core of polarization maintaining optical fibre 16The input 15 of sheet 4 is aimed at, and the tail optical fiber 11 of polarization-maintaining fiber coil 5 accesses light power meter; Micro-by 6 DOFFrame is adjusted to regulate the tail optical fiber II end of polarization maintaining optical fibre 16 and the tail optical fiber of polarization-maintaining fiber coil 5 10 and the second Y waveguide integratedThe position of optics lithium niobate chip 4, the light power meter that the tail optical fiber 11 of polarization-maintaining fiber coil 5 is connect detectsThe luminous power maximum arriving; By the tail optical fiber of polarization-maintaining fiber coil 5 10 and optical fiber fixed block 17 and polarization maintaining optical fibre 16Tail optical fiber II end and the end face of optical fiber fixed block 21 and the second Y waveguide integrated optics device lithium niobate chip 4Carry out a glue to fix, realization is of coupled connections with the second Y waveguide integrated optics device lithium niobate chip 4.
4, by the tail optical fiber of polarization-maintaining fiber coil 5 11 and the second Y waveguide integrated optics device lithium niobate chip 4Output 13 is of coupled connections, and realizes the closed-loop fiber optic gyroscope light path of weldless point.
Add drive source to light source 1 and photo-detector 2, make it in running order; By polarization-maintaining fiber coil 5Tail optical fiber 11 and optical fiber fixed block 18 be placed on sextuple micropositioning stage, make the tail optical fiber 11 of polarization-maintaining fiber coil 5Aim at the output 13 of the second Y waveguide integrated optics device lithium niobate chip 4; By sextuple micropositioning stageRegulate tail optical fiber 11 and the second Y waveguide integrated optics device lithium niobate chip 4 relative of polarization-maintaining fiber coil 5Position, makes the luminous power maximum detecting from photo-detector 2; By the tail optical fiber of polarization-maintaining fiber coil 5 11 and lightThe end face of fine fixed block 18 and the second Y waveguide integrated optics device lithium niobate chip 4 carries out a glue to be fixed,Realization is of coupled connections with the second Y waveguide integrated optics device lithium niobate chip 4.
The circuits assembly of optical fibre gyro of the present invention is substantially identical with conventional fiber gyro, when light path and circuit wholeComplete when assembling, by the mode of gold wire bonding by the second Y waveguide integrated optics device lithium niobate chip 4Modulator electrode is connected with gyro circuit, completes gyro assembly.
The common practise that the unspecified part of the present invention is those skilled in the art.
Claims (10)
1. a closed-loop fiber optic gyroscope for full light path weldless point, is characterized in that: light path comprise light source (1),Photo-detector (2), the first Y waveguide integrated optics device lithium niobate chip (3), the second Y waveguide Integrated LightLearn device lithium niobate chip (4), polarization-maintaining fiber coil (5) and polarization maintaining optical fibre (16), the first Y waveguide is integratedThe end face of optics lithium niobate chip (3) and the second Y waveguide integrated optics device lithium niobate chip (4)Polishing, first and second end tail optical fiber (10,11) of polarization-maintaining fiber coil (5), the tail optical fiber (6) of light source (1),The tail optical fiber (7) of photo-detector (2) and tail optical fiber II, I of polarization maintaining optical fibre (16) end be separately fixed at first,Two, three, four, five and six fibers fixed block (17,18,19,20,21,22) upper, polarisation will be protectedFirst and second end tail optical fiber (10,11), the tail optical fiber (6) of light source (1), the photo-detector (2) of fine ring (5)Tail optical fiber (7) and polarization maintaining optical fibre (16) tail optical fiber II, I end and first, second, third and fourth, five and sixOptical fiber fixed block (17,18,19,20,21,22) polishing together, first of polarization-maintaining fiber coil (5)End tail optical fiber (10) and the first optical fiber fixed block (17) polishing angle and the second Y waveguide integrated optical device niobiumAcid lithium chip (4) polishing angle direction is consistent, and tail optical fiber (7) and the 4th optical fiber of photo-detector (2) are solidDetermine piece (20) polishing angle and the first Y waveguide integrated optics device lithium niobate chip (3) polishing angle sideTo unanimously, Y waveguide integrated optics device lithium niobate chip end face polishing angle beta and tail optical fiber and optical fiber fixed blockThe pass of polishing angle [alpha] beWherein n1For Y waveguide integrated optical device niobic acidThe refractive index of lithium chip, n2For the refractive index of optical fiber;
First and second output (8,9) point of the first Y waveguide integrated optics device lithium niobate chip (3)Not and the tail optical fiber (7) of the tail optical fiber (6) of light source (1) and the 3rd optical fiber fixed block (19), photo-detector (2)And the 4th optical fiber fixed block (20) be of coupled connections, the second Y waveguide integrated optics device lithium niobate chip (4)First and second output (12,13) respectively with first and second tail optical fiber of polarization-maintaining fiber coil (5) (10,11) and first and second optical fiber fixed block (17,18) be of coupled connections, the tail optical fiber II of polarization maintaining optical fibre (16),I end and the 5th, six fibers fixed block (21,22) respectively with the second Y waveguide integrated optics device lithium niobateThe input (15) of chip (4), the input of the first Y waveguide integrated optics device lithium niobate chip (3)End (14) is of coupled connections, and does not have the fusion point of optical fiber in whole fiber-optic gyroscope light path.
2. the closed-loop fiber optic gyroscope of a kind of full light path weldless point according to claim 1, its feature existsIn: the described mode being of coupled connections is formal dress coupling.
3. a closed-loop fiber optic gyroscope light path implementation method for full light path weldless point, it is characterized in that by withLower step realizes:
The first step, to first and second end tail optical fiber (10,11) dead axle of polarization-maintaining fiber coil (5), identifies itStress axis, by first and second end tail optical fiber (10,11) of polarization-maintaining fiber coil (5) according to slow axis perpendicular toOne, the direction of the holddown groove bottom surface of two optical fiber fixed blocks (17,18) is fixed on first and second optical fiber fixed blockOn (17,18);
Second step, is fixed on third and fourth by the tail optical fiber (7) of the tail optical fiber of light source (1) (6) and photo-detectorOn optical fiber fixed block (19,20);
3rd step, to tail optical fiber I and the II end dead axle of polarization maintaining optical fibre (16), identifies the stress axis at its two ends,Tail optical fiber I and II is held according to the holddown groove bottom surface of slow axis perpendicular to the 6th, five optical fiber fixed blocks (22,21)Direction be fixed on the 6th, five optical fiber fixed blocks (22,21);
4th step, prepares first, second Y waveguide integrated optics device lithium niobate chip (3,4) and by itEnd face is by the polishing of polishing angle beta;
5th step, by the tail optical fiber described in the first step, second step and the 3rd step and the polishing of optical fiber fixed block, pressesThe polishing of polishing angle [alpha], Y waveguide integrated optics device lithium niobate chip end face polishing angle beta and tail optical fiber and lightThe pass of the polishing angle [alpha] of fine fixed block isWherein n1For Y waveguide integrated opticsThe refractive index of device lithium niobate chip, n2For the refractive index of optical fiber;
6th step, by first output (8) of the first Y waveguide integrated optics device lithium niobate chip (3)And input (14) is inclined to one side with tail optical fiber (6) and the 3rd optical fiber fixed block (19) and the guarantor of light source (1) respectivelyTail optical fiber I end and the six fibers fixed block (22) of optical fiber (16) are of coupled connections;
7th step, by second output (9) of the first Y waveguide integrated optics device lithium niobate chip (3)Be of coupled connections with tail optical fiber (7) and the 4th optical fiber fixed block (20) of photo-detector (2);
8th step, by first output (12) of the second Y waveguide integrated optics device lithium niobate chip (4)And input (15) is fixed with first end tail optical fiber (10) and first optical fiber of polarization-maintaining fiber coil (5) respectivelyTail optical fiber II end and the 5th optical fiber fixed block (21) of piece (17) and polarization maintaining optical fibre (16) are of coupled connections;
9th step, by the second end tail optical fiber (11) of polarization-maintaining fiber coil (5) and the second optical fiber fixed block (18)Be of coupled connections with second output (13) of the second Y waveguide integrated optics device lithium niobate chip (4),Realize the closed-loop fiber optic gyroscope light path of weldless point.
4. the closed-loop fiber optic gyroscope light path realization side of a kind of full light path weldless point according to claim 3Method, is characterized in that: the first end tail optical fiber (10) and first of polarization-maintaining fiber coil (5) in described 4th stepOptical fiber fixed block (17) is contrary with the second end tail optical fiber (11) and the second optical fiber fixed block (18) polishing angle,The tail optical fiber (6) of light source (1) and the tail optical fiber (7) of the 3rd optical fiber fixed block (19) and photo-detector (2)And the 4th optical fiber fixed block (20) polishing angle contrary.
5. the closed-loop fiber optic gyroscope light path realization side of a kind of full light path weldless point according to claim 3Method, is characterized in that: in described 6th step, be coupled through following steps and realize,
The first step, adds drive source to light source (1), makes it in running order;
Second step, by the tail optical fiber of light source (1) (6) and the 3rd optical fiber fixed block (19) and polarization maintaining optical fibre (16)Tail optical fiber I end and six fibers fixed block (22) be placed on sextuple fine adjustment frame, make light source (1)Tail optical fiber (6) is right with first output (8) of the first Y waveguide integrated optics device lithium niobate chip (3)Standard, tail optical fiber I end and the first Y waveguide integrated optics device lithium niobate chip (3) of polarization maintaining optical fibre (16)Input (14) aim at, the tail optical fiber II termination of polarization maintaining optical fibre (16) enters light power meter;
3rd step, is regulated tail optical fiber (6) and the polarization maintaining optical fibre (16) of light source (1) by sextuple fine adjustment frameTail optical fiber I end and the position of the first Y waveguide integrated optics device lithium niobate chip (3), make polarization maintaining optical fibre(16) the luminous power maximum that the light power meter of tail optical fiber II termination detects;
4th step, by the tail optical fiber of light source (1) (6) and the 3rd optical fiber fixed block (19) and polarization maintaining optical fibre (16)Tail optical fiber I end and six fibers fixed block (22) respectively with the first Y waveguide integrated optics device lithium niobate coreSheet (3) end face carries out a glue to be fixed, and realizes and the first Y waveguide integrated optics device lithium niobate chip (3)Be of coupled connections.
6. the closed-loop fiber optic gyroscope light path realization side of a kind of full light path weldless point according to claim 3Method, is characterized in that: in described 7th step, be coupled through following steps and realize,
The first step, adds drive source to photo-detector (2), makes it in running order;
Second step, puts the tail optical fiber of photo-detector (2) (7) together with the 4th optical fiber fixed block (20)Put on sextuple fine adjustment frame, make the tail optical fiber (7) of photo-detector (2) and the first Y waveguide integrated optics deviceSecond output (9) of part lithium niobate chip (3) is aimed at;
3rd step, from the tail optical fiber II end input optical power of polarization maintaining optical fibre (16), is adjusted by sextuple fine adjustment frameTail optical fiber (7) and the first Y waveguide integrated optics device lithium niobate chip (3) of joint photo-detector (2)Position, makes the luminous power maximum receiving from photo-detector (2);
4th step, by the tail optical fiber of photo-detector (2) (7) and the 4th optical fiber fixed block (20) and a YWave-guide integrated optics device lithium niobate chip (3) end face carries out a glue to be fixed, and realizes and the first Y waveguide collectionBecome being of coupled connections of optics lithium niobate chip (3).
7. the closed-loop fiber optic gyroscope light path realization side of a kind of full light path weldless point according to claim 3Method, is characterized in that: in described 8th step, be coupled through following steps and realize,
The first step, adds drive source to light source (1), makes it in running order;
Second step, by the first end tail optical fiber (10) of polarization-maintaining fiber coil (5) and the first optical fiber fixed block (17)And tail optical fiber II end and the 5th optical fiber fixed block (21) of polarization maintaining optical fibre (16) are placed on sextuple micropositioning stage,Make the first end tail optical fiber (10) of polarization-maintaining fiber coil (5) and the second Y waveguide integrated optics device lithium niobate coreFirst output (12) of sheet (4) is aimed at, tail optical fiber II end and second Y waveguide of polarization maintaining optical fibre (16)The input (15) of integrated optics device lithium niobate chip (4) is aimed at, second of polarization-maintaining fiber coil (5)End tail optical fiber (11) access light power meter;
3rd step, is regulated tail optical fiber II end and the polarization-maintaining fiber coil (5) of polarization maintaining optical fibre (16) by sextuple micropositioning stageThe position of first end tail optical fiber (10) and the second Y waveguide integrated optics device lithium niobate chip (4), makeThe luminous power maximum that the light power meter that the second end tail optical fiber (11) of polarization-maintaining fiber coil (5) connects detects;
4th step, by the first end tail optical fiber (10) of polarization-maintaining fiber coil (5) and the first optical fiber fixed block (17)And tail optical fiber II end and the 5th optical fiber fixed block (21) and the second Y waveguide integrated optics of polarization maintaining optical fibre (16)The end face of device lithium niobate chip (4) carries out a glue to be fixed, and realizes and the second Y waveguide integrated optical deviceBeing of coupled connections of lithium niobate chip (4).
8. the closed-loop fiber optic gyroscope light path realization side of a kind of full light path weldless point according to claim 3Method, is characterized in that: in described 9th step, be coupled through following steps and realize,
The first step, adds drive source to light source (1) and photo-detector (2), makes it in running order;
Second step, by the second end tail optical fiber (11) of polarization-maintaining fiber coil (5) and the second optical fiber fixed block (18)Be placed on sextuple micropositioning stage, make the second end tail optical fiber (11) of polarization-maintaining fiber coil (5) and the second Y waveguideSecond output (13) of integrated optics device lithium niobate chip (4) is aimed at;
3rd step, is regulated the second end tail optical fiber (11) and second of polarization-maintaining fiber coil (5) by sextuple micropositioning stageThe relative position of Y waveguide integrated optics device lithium niobate chip (4), makes to detect from photo-detector (2)Luminous power maximum;
4th step, by the second end tail optical fiber (11) of polarization-maintaining fiber coil (5) and the second optical fiber fixed block (18)Carry out a glue with the end face of the second Y waveguide integrated optics device lithium niobate chip (4) to fix, realize and theBeing of coupled connections of two Y waveguide integrated optics device lithium niobate chip (4).
9. the closed-loop fiber optic gyroscope light path of a kind of full light path weldless point according to claim 3 realizesMethod, is characterized in that: the tail optical fiber (6) of light source in described second step (1) is selected polarization maintaining optical fibre, and it is right to needTail optical fiber (6) dead axle of light source (1), identifies its stress axis, according to slow axis perpendicular to the 3rd optical fiber fixed block(19) direction of holddown groove bottom surface is fixed on the 3rd optical fiber fixed block (19).
10. the closed-loop fiber optic gyroscope light path of a kind of full light path weldless point according to claim 3 or 9Implementation method, is characterized in that: the dead axle precision of described polarization maintaining fiber pigtail is ± 1.5 °.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105659814B true CN105659814B (en) | 2013-05-08 |
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| CN113884085B (en) * | 2021-12-01 | 2022-02-08 | 深圳奥斯诺导航科技有限公司 | Based on SiO2Integrated optical chip for fiber-optic gyroscope with-SiN coupled chip structure |
| CN113865578A (en) * | 2021-12-06 | 2021-12-31 | 深圳奥斯诺导航科技有限公司 | SiN-based integrated optical chip for optical fiber gyroscope based on SiON polarizer |
| CN113865578B (en) * | 2021-12-06 | 2022-02-08 | 深圳奥斯诺导航科技有限公司 | SiN-based integrated optical chip for optical fiber gyroscope based on SiON polarizer |
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