CN103837931A - Novel polarization circulating Y-waveguide structure for fiber-optic gyroscope - Google Patents
Novel polarization circulating Y-waveguide structure for fiber-optic gyroscope Download PDFInfo
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- CN103837931A CN103837931A CN201410005173.2A CN201410005173A CN103837931A CN 103837931 A CN103837931 A CN 103837931A CN 201410005173 A CN201410005173 A CN 201410005173A CN 103837931 A CN103837931 A CN 103837931A
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Abstract
The invention relates to a novel polarization circulating Y-waveguide structure for a fiber-optic gyroscope. The novel polarization circulating Y-waveguide structure comprises a Y-shaped branched waveguide, a semicircular waveguide, an input tail optical fiber and two polarization-maintaining output tail optical fibers. The semicircular waveguide is located at output ends of the Y-shaped branched waveguide. The low-loss linear polarization direction in which the semicircular waveguide transmits light is perpendicular to the low-loss linear polarization direction in which an existing Y-shaped branched waveguide transmits light. The two ends of the semicircular waveguide are tangent to the two output ends of the Y-shaped branched waveguide, so it can be guaranteed that the low-loss linear polarization direction in which the semicircular waveguide transmits light and the low-loss linear polarization direction in which the existing Y-shaped branched waveguide transmits the light coincide with the polarization direction of the polarization-maintaining output tail optical fibers. Compared with an existing Y-shaped branched waveguide technology, the novel polarization circulating Y-waveguide structure for the interference type polarization-maintaining fiber-optic gyroscope can effectively suppress nonreciprocal errors such as polarization crosstalk and Faraday effects and can enable the length of a sensing coil to be doubled.
Description
Technical field
The present invention relates to a kind of inertial navigation device assembly, especially relate to the belt Y waveguide structure of a kind of novel polarization for interfere type polarization maintaining optical fibre gyro.
Background technology
Optical fibre gyro is take sensor coil and integrated optical device as basic inertial navigation device, for autonomous rotatablely move (angular velocity of rotation) of carrier with respect to inertial space of measuring, the exact position of inertia system being calculated to carrier, direction etc. have key effect.Its ultimate principle is based on Sagnac effect, interference optical fiber top (IFOG) is mainly take interferometer as basis, two-beam to transmit clockwise and counterclockwise in fiber optic coils, because the rotation of carrier produces phase differential, interfere in detection port, and then calculate the angular velocity of rotation of carrier.IFOG with it in precision, shock resistance, price, size, weight and the obvious advantage that had on the long-life; be applicable to the advantage of large-scale production; in industry and Military Application, expand many newer purposes, become one of inertia device at present with the fastest developing speed.
Integrated optical device (Y waveguide) is the Primary Component of optical fibre gyro.Device adopts lithium niobate (LiNbO conventionally
3) be substrate, adopt the techniques such as proton exchange to make the optical waveguide of Y shape shape, light beam is divided/closes, the partially/analyzing multiple function that rises of phase of light wave modulation and light integrates.Rise and partially make the input light of sensing coil be approximately linearly polarized light, analyzing can suppress the impact of the orthogonal polarisation state that in sensing coil, light wave coupling produces, and reduces the polarization error of gyro.But existing Y waveguide device can not suppress the nonreciprocal error such as polarization interference and Faraday effect in sensing coil, practical along with optical fibre gyro system is also more and more higher to the performance requirement of Y waveguide integrated optical device.
Summary of the invention
Object of the present invention is exactly that a kind of novel polarization that can suppress the nonreciprocal error such as polarization interference and Faraday effect in sensing coil Y waveguide branch device architecture that goes in ring is provided in order to overcome the defect that above-mentioned existing Y waveguide technology exists.
Object of the present invention can be achieved through the following technical solutions:
For the belt Y waveguide structure of novel polarization of optical fibre gyro, comprise a Y shape branch-waveguide and a semicircular waveguide, and one input optical fibre and two output protect inclined to one side optical fiber pigtail, semicircular waveguide is positioned at the output terminal of Y shape branch-waveguide, and the low-loss linear polarization of semicircular waveguide transmission light is vertical with the low-loss linear polarization of existing y branch waveguide transmission light.Two output terminals of the two ends of this semicircular waveguide and Y shape branch-waveguide are tangent, guarantee so semicircle consistent with the polarization direction of protecting inclined to one side output optical fiber pigtail with the low-loss linear polarization of existing y branch waveguide transmission light.
The backing material of described semicircular waveguide and Y shape branch-waveguide is lithium niobate or other backing material, and backing material can be identical, also can be different.
Described semicircular waveguide and Y shape branch-waveguide can adopt proton exchange or ion-exchange or interior diffusion or external diffusion or implanted ions planar optical waveguide Manufacturing Techniques.
Described semicircular waveguide and Y shape branch-waveguide can adopt the polarization eigen state of different or identical planar optical waveguide Manufacturing Techniques semicircular waveguide and the polarization eigen state of Y shape branch-waveguide orthogonal, transmit respectively the linearly polarized light of parallel polarization direction and the linearly polarized light of vertical direction.
Described novel Y waveguide output terminal two low-loss linearly polarized light directions are consistent with fast axle and the slow axis of protecting inclined to one side optical fiber pigtail, butt coupling.
When only propagating the perpendicular linear polarization light time in Y shape branch-waveguide arm, in semicircular waveguide, only propagate parallel lines polarized light; In the time only propagating parallel lines polarized light in Y shape branch-waveguide arm, in semicircular waveguide, only propagate perpendicular linear polarization light.In the time that perpendicular linear polarization light wave is inputted from tail optical fiber, perpendicular linear polarization light is exported from Y shape branch-waveguide, parallel lines polarized light will be from semicircular waveguide mechanism output, from the perpendicular linear polarization light of Y shape branch-waveguide input and all export from tail optical fiber from the parallel lines polarized light of semicircular waveguide Mechanism input.As can be seen here, no matter be the vertical direction linearly polarized light of propagating from Y shape branch-waveguide, or the parallel direction linearly polarized light of propagating from semicircular waveguide, all output to tail optical fiber by output port coupling.Can allow the wherein slow axis butt coupling of Y shape branch-waveguide and tail optical fiber, the fast axle butt coupling of semicircular waveguide and tail optical fiber.The linearly polarized light being entered by output port, slow axial light is coupled to Y shape branch-waveguide arm relaying and resumes and broadcast, and fast axial light is coupled to semicircular waveguide mechanism relaying and resumes and broadcast.
Y shape branch-waveguide is only propagated the waveguide of vertical polarization, propagates the loss of parallel polarization light time and is greater than 60dB, and semicircular waveguide is only propagated the waveguide of parallel polarization direction, propagates the loss of vertical polarization light time and is greater than 60dB.
Two output ports of described Y shape branch-waveguide are 10 °-15 ° tiltedly casting and putting, and make two y branch waveguide length asymmetric, reduce the coherence of back-reflection light wave.
Described tail optical fiber can also connect Sagnac sensing coil, one of them tail optical fiber docks with 90 ° of sensing coils, another tail optical fiber and sensing coil parallel docking, realize the length doubles of sensing coil, and can suppress to a great extent polarization acoustic, Faraday effect etc.
Compared with prior art, the present invention has the following advantages:
(1) due to for perpendicular linear polarization light and parallel lines polarized light are provided with path separately, greatly reduce the interference of polarization acoustic;
(2) due to the existence of the path that goes in ring, can allow light wave go in ring twice in sensing coil, make sensing coil length doubles;
(3) adopt the interfere type of this novel Y waveguide to protect inclined to one side gyro and can also suppress Fauraday nonreciprocal phase shift, its random walk simultaneously also has clear improvement.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, 1 is that input optical fibre, 2 is that Y shape branch-waveguide arm, 3 is that Y shape branch-waveguide arm, 4 is that semicircular waveguide, 5 is that tail optical fiber, 6 is tail optical fiber.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
For the novel polarization annular Y waveguide structure of optical fibre gyro, its structure as shown in Figure 1.Comprise a Y shape branch-waveguide and a semicircular waveguide, and an input optical fibre and the inclined to one side optical fiber pigtail of two output guarantors.Input optical fibre and Y shape branch-waveguide semicircular waveguide are positioned at the output terminal of Y shape branch-waveguide, and the low-loss linear polarization of semicircular waveguide transmission light is vertical with the low-loss linear polarization of existing y branch waveguide transmission light.Two output terminals of the two ends of this semicircular waveguide and Y shape branch-waveguide are tangent, guarantee that like this low-loss linear polarization of semicircular waveguide and existing y branch waveguide transmission light is consistent with the polarization direction of protecting inclined to one side output optical fiber pigtail.Wherein, backing material is made up of lithium niobate or other material.Semicircular waveguide 4 and Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3 are made up of lithium niobate, the polarization eigen state of semicircular waveguide 4 and Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3 are orthogonal, transmit respectively the light of linear polarization and the linearly polarized light of vertical direction of parallel polarization direction.Make the output terminal of Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3 dock with the slow axis of protecting inclined to one side tail optical fiber 5, tail optical fiber 6, semicircular waveguide 4 docks with the fast axle of protecting inclined to one side tail optical fiber 5, tail optical fiber 6.
In Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3, only propagate perpendicular linear polarization light, propagate the loss of parallel polarization light time and be greater than 60dB, in semicircular waveguide 4, only propagate parallel lines polarized light, propagate the loss of vertical polarization light time and be greater than 60dB.In the time that light wave is inputted from protecting inclined to one side tail optical fiber 5, tail optical fiber 6, perpendicular linear polarization light is exported from Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3, parallel lines polarized light will be exported from semicircular waveguide 4, the perpendicular linear polarization light of inputting from Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3 and the parallel lines polarized light of inputting from semicircular waveguide 4 all from protecting inclined to one side tail optical fiber 5, tail optical fiber 6 is exported.As can be seen here, no matter be the vertical direction linearly polarized light of propagating from Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3, or the parallel direction linearly polarized light of propagating from semicircular waveguide 4, all output to and protect inclined to one side tail optical fiber 5, tail optical fiber 6 by output port coupling.Y shape branch- waveguide arm 2,3 waveguides of propagating vertical polarization of Y shape branch-waveguide arm, in addition, two output ports of Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3 are 10 ° and tiltedly cast and put, and make two y branch waveguide length asymmetric, reduce the coherence of back-reflection light wave.
Tail optical fiber 5, tail optical fiber 6 can also connect Sagnac sensing coil, one of them tail optical fiber docks with 90 ° of sensing coils, another tail optical fiber and sensing coil parallel docking, realize the length doubles of sensing coil, and can suppress to a great extent polarization acoustic, Faraday effect etc.
Novel polarization goes in ring Y waveguide structure as accompanying drawing l, the optical waveguide that A is ordered to D with B to C point optical waveguide has the same structure and characteristics, they are Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3, and local oscillator polarization state and the conventional waveguide of the semicircular waveguide 4 that D point is ordered to C are orthogonal.Y shape branch-waveguide has two points of support arms 2,3, and semicircular waveguide 4 becomes the semicircle Liang Tiao branch that connects at output terminal, and these three waveguides form polarization circulator, and forms output tail optical fiber at output terminal and polarization maintaining optical fibre coupling.When the arbitrary output port of the Y waveguide realizing polarized light circulating adds after 90 ° of optically-active catoptrons, will become parallel lines polarized light from the perpendicular linear polarization light of y branch waveguide input and return, but enter semicircular waveguide.
Conventionally, we represent the orientation of crystal substrates with " cutting " of certain direction, represent a certain surface that is axially perpendicular to crystal of crystal, and for example x cuts, y cuts with z and cuts.Conventional Y shape branch-waveguide at present, wherein the orientation of lithium columbate crystal substrate adopts x to cut mostly, y propagates, the preparation of novel Y waveguide: first identical with traditional Y shape branch-waveguide method for making, substrate is made up of lithium niobate (LiNbO3) or other suitable materials.Waveguide material is lithium niobate, adopts proton exchange or other technique on substrate, to diffuse to form wave guide zone.Due to its structure and boundary condition, make can only propagate in Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3 light wave of perpendicular linear polarization direction, if transmission parallel polarized light loss more than 60dB.
Next prepare semicircular waveguide, because deep diffusion difficulty in technique is higher, so take the way of splicing.On traditional Y shape branch-waveguide, cut out a part, form a semicircle breach.Make again an energy and semicircle breach slitless connection, and the identical semicircle substrate bulk of size, on the arc surface of semicircle substrate, diffuse to form semicircular waveguide, again by semicircle piece 4 slitless connections to semicircle breach, so just made the semicircular waveguide of only propagating parallel polarization direction light, and Y shape branch-waveguide and semicircular waveguide are realized coincidence at output terminal C, D.
Novel Y waveguide output terminal two low-loss linearly polarized light directions are consistent with fast axle and the slow axis of protecting inclined to one side tail optical fiber, butt coupling.The shape of waveguide and other performances are not done specific requirement, only need to guarantee above-mentioned propagation characteristic requirement.
Tail optical fiber 5, tail optical fiber 6 adopt polarization maintaining optical fibre, can guarantee that like this light wave keeps its polarization state while propagation in optical fiber.
The application of interfere type polarization maintaining optical fibre gyro
This novel polarization is gone in ring to y branch waveguide structure applications in interfere type polarization maintaining optical fibre gyro, after Y waveguide is protected inclined to one side tail optical fiber, connect fiber optic sensing coil, sensing coil is necessary for polarization maintaining optical fibre.Wherein a tail optical fiber docks with 90 ° of fiber optic coils, and the slow axis of tail optical fiber docks with the fast axle of optical fiber, and the fast axle of tail optical fiber docks with the slow axis of optical fiber: another root tail optical fiber and fiber optic coils parallel docking, the slow axis of tail optical fiber docks with optical fiber slow axis.The fast axle of tail optical fiber docks with the fast axle of optical fiber.
With reference to accompanying drawing 1, perpendicular linear polarization light enters polarization circulator by A point, comes C point by Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3, enters tail optical fiber, dock because a tail optical fiber is wherein 90 ° with optical fiber, therefore light wave is propagated and is become parallel lines polarized light and come D port through coil.Then light wave will be come C port and enter tail optical fiber via semicircular waveguide 4 and transmit for the second time, become perpendicular linear polarization light again for the second time arrive port D through coil, then arrive B point via Y shape branch-waveguide arm 2, Y shape branch-waveguide arm 3.Like this, owing to propagating twice in coil, be equivalent to loop length to become original 2 times.In like manner, when perpendicular linear polarization light is entered by B point, also 2 annulars of light wave in fiber optic coils will be realized.
Above-mentioned example is only explanation technical conceive of the present invention and feature, can not limit with this protection domain of this invention.Every equivalent transformation that idea is done according to the present invention or modification, within all should being encompassed in protection scope of the present invention.
Claims (4)
1. for the belt Y waveguide structure of novel polarization of optical fibre gyro, comprise novel Y waveguide, input optical fibre is coupling-connected to novel Y waveguide input end, and two protect output optical fiber pigtail partially, are coupling-connected to novel Y waveguide two output terminals, it is characterized in that,
Between two output terminals of Y shape branch-waveguide, connected a semicircular waveguide, two output terminals of the two ends of this semicircular waveguide and Y shape branch-waveguide are tangent and protect inclined to one side optical fiber pigtail with two outputs and be of coupled connections and form the output tail optical fiber of the novel Y waveguide that can realize polarized light circulating.
2. the belt Y waveguide structure of the novel polarization for optical fibre gyro according to claim 1, is characterized in that, the low-loss linear polarization of described semicircular waveguide transmission light is vertical with the low-loss linear polarization of y branch waveguide transmission light.
3. the belt Y waveguide structure of the novel polarization for optical fibre gyro according to claim 2, is characterized in that, described novel Y waveguide output terminal two low-loss linearly polarized light directions are consistent with fast axle and the slow axis of protecting inclined to one side optical fiber pigtail, butt coupling.
4. according to the belt Y waveguide structure of the novel polarization for optical fibre gyro described in claim l, it is characterized in that, the length of described Y shape branch-waveguide two arms is unequal, and two output ports are 10 °-15 ° tiltedly casting and putting.
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| CN201410005173.2A CN103837931B (en) | 2014-01-06 | 2014-01-06 | Polarization for optical fibre gyro goes in ring Y waveguide structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104625944A (en) * | 2015-02-26 | 2015-05-20 | 中国电子科技集团公司第四十四研究所 | Photonic crystal fiber end face polishing method and device obtained according to photonic crystal fiber end face polishing method |
| CN104714275A (en) * | 2015-03-06 | 2015-06-17 | 兰州大学 | Y-branch-based easily-integrated silica-based wave guide optical reflector |
| CN105806329A (en) * | 2016-03-16 | 2016-07-27 | 北京航天时代光电科技有限公司 | Integrated optical modulator for multiplicated optical fiber gyroscope interferometer optical distance and optical fiber gyroscope optical path |
| CN105973222A (en) * | 2016-06-17 | 2016-09-28 | 同济大学 | Sagnac phase shifting multiplication structure of interferometric fiber-optic gyroscope |
| CN107328404A (en) * | 2017-07-28 | 2017-11-07 | 同济大学 | The super large Sagnac interference optical fiber tops of effective fiber length N multiplications |
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| JPH1073735A (en) * | 1996-06-07 | 1998-03-17 | Lucent Technol Inc | Optical power splitter |
| CN101294808A (en) * | 2008-06-12 | 2008-10-29 | 浙江大学 | Optical fiber gyroscope based on double-core photon crystal optical fiber |
| EP2169350A2 (en) * | 2008-09-24 | 2010-03-31 | Honeywell International Inc. | Bias-reduced fiber optic gyroscope |
| US20130170781A1 (en) * | 2011-12-28 | 2013-07-04 | Karl Kissa | Y-branch dual optical phase modulator |
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2014
- 2014-01-06 CN CN201410005173.2A patent/CN103837931B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1073735A (en) * | 1996-06-07 | 1998-03-17 | Lucent Technol Inc | Optical power splitter |
| CN101294808A (en) * | 2008-06-12 | 2008-10-29 | 浙江大学 | Optical fiber gyroscope based on double-core photon crystal optical fiber |
| EP2169350A2 (en) * | 2008-09-24 | 2010-03-31 | Honeywell International Inc. | Bias-reduced fiber optic gyroscope |
| US20130170781A1 (en) * | 2011-12-28 | 2013-07-04 | Karl Kissa | Y-branch dual optical phase modulator |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104625944A (en) * | 2015-02-26 | 2015-05-20 | 中国电子科技集团公司第四十四研究所 | Photonic crystal fiber end face polishing method and device obtained according to photonic crystal fiber end face polishing method |
| CN104714275A (en) * | 2015-03-06 | 2015-06-17 | 兰州大学 | Y-branch-based easily-integrated silica-based wave guide optical reflector |
| CN105806329A (en) * | 2016-03-16 | 2016-07-27 | 北京航天时代光电科技有限公司 | Integrated optical modulator for multiplicated optical fiber gyroscope interferometer optical distance and optical fiber gyroscope optical path |
| CN105973222A (en) * | 2016-06-17 | 2016-09-28 | 同济大学 | Sagnac phase shifting multiplication structure of interferometric fiber-optic gyroscope |
| CN107328404A (en) * | 2017-07-28 | 2017-11-07 | 同济大学 | The super large Sagnac interference optical fiber tops of effective fiber length N multiplications |
| CN107328404B (en) * | 2017-07-28 | 2020-07-28 | 同济大学 | Oversized Sagnac interference type fiber-optic gyroscope with N-multiplied effective fiber-optic length |
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