CN208333489U - A kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers - Google Patents
A kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers Download PDFInfo
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- CN208333489U CN208333489U CN201820958770.0U CN201820958770U CN208333489U CN 208333489 U CN208333489 U CN 208333489U CN 201820958770 U CN201820958770 U CN 201820958770U CN 208333489 U CN208333489 U CN 208333489U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 159
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000013078 crystal Substances 0.000 claims abstract description 6
- 230000010287 polarization Effects 0.000 claims description 23
- 230000008033 biological extinction Effects 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 230000003321 amplification Effects 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
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- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model relates to technical field of optical fiber sensing, for existing gyro because drawing the conventional polarizers bring open-loop optical fiber gyro reliability hidden danger such as cone and crystal growth, Y waveguide using optical fiber, being difficult to realize a series of problems, such as smaller volume and power consumption are larger, there is provided a kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers comprising light source, detector, the first coupler, the second coupler, fiber optic loop and phase-modulator；The light source is SLD light source or ASE light source；Light source and detector are connect with the first coupler respectively；Second coupler is connected with the both ends of fiber optic loop；It is characterized in that further include 45 ° of inclined optical fiber grating polarizers, and 45 ° of inclined optical fiber grating polarizers both ends are connected with the first coupler and the second coupler respectively.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, and in particular to one kind is based on 45 ° of inclined optical fiber grating polarizers
Open-loop optical fiber gyro.
Background technique
Optical fibre gyro is a kind of sensor for detecting carrier movement angular speed, is the Primary Component in navigation instrument,
Its product has been widely used in the wide range of areas such as aeronautics and space, navigation and deep-sea detecting, railway, communication.Wherein, open loop light
Fine gyro has performance small in size, light-weight, structure is simple and relatively excellent, has in middle low-precision optical fiber gyro field
Broad mass market potentiality.
With the continuous expansion of scientific research and engineer application, the environment of open-loop optical fiber gyro work becomes increasingly complex, divided ring
Stability, volume, weight and the power consumption of optical fibre gyro also have higher requirement.
The polarizer used in traditional open-loop optical fiber gyro scheme draws cone and crystal growth for online optical fiber, this to be polarized
The device is complicated for scheme demand, technology difficulty is big, yield rate is low, and wimble structure is drawn also to determine that its impact resistance is poor, it is reliable to exist
Property hidden danger.In recent years, Some Enterprises and research institution have carried out some improvement for being polarized scheme, start being polarized using Y waveguide
Scheme, but still have following defects that
(1) Y waveguide itself is not all optical fibre structure, needs Space Coupling to optical fiber output in optical fibre gyro system, at this
Being spatially separating coupling unit need to exist by special fixation and encapsulation because environment high vibration causes coupling efficiency to reduce even
The risk of failure.In addition, to obtain smaller gyro volume, or even Y waveguide encapsulation can be removed, it further reduced optical fibre gyro
Stability.
(2) since Y waveguide is block structure, in certain open-loop optical fiber gyro schemes, to realize smaller volume optical fiber top
The same super-radiance light emitting diode of Y waveguide (SLD) light source, circuit board can only be generally fixed on the two sides of fiber optic loop, to draw by spiral shell
Enter an optical fiber longitudinally through gyro.To protect the optical fiber, fiber optic loop need to be designed by special machine, additionally will be to the Duan Zong
Casing protection is added to optical fiber.Nevertheless, the optical fiber still remains damage in the environment of high-frequency vibration, high vibration
Risk, and then lead to the system failure.
(3) Insertion Loss of Y waveguide is larger, therefore is had based on power of the open-loop optical fiber gyro of Y waveguide for light source higher
Requirement, while make open-loop optical fiber gyro power consumption increase, be unfavorable for the application of optical fibre gyro.
Utility model content
The utility model provides a kind of based on 45 ° of inclined optical fiber grating polarizers for the problems of prior art
Open-loop optical fiber gyro, solve existing gyro because drawing cone and the conventional polarizers bring such as crystal growth, Y waveguide using optical fiber
Open-loop optical fiber gyro reliability hidden danger is difficult to realize a series of problems, such as smaller volume and power consumption are larger.Guaranteeing open loop light
While fine Gyro Precision, its stability, reliability can be effectively improved, improves the multinomial performance of open-loop optical fiber gyro, realization is opened
Smallerization of ring optical fibre gyro, lighter amount, more low-power consumption, more inexpensive, more constructional simple design and technique are open loop light
Fine gyro performance boost, application, expansion and market are universal to have established important foundation.
The utility model design of the utility model is: SLD (super-radiance light emitting diode) light source or ASE (Amplified Spontaneous spoke
Penetrate) into 45 ° of inclined optical fiber grating polarizers after the first coupler, it generates single polarization and simultaneously enters the light of light source sending
Second coupler, the two-beam that the polarization states such as isocandela are divided into after the second coupler enter fiber optic loop, this two-beam is in optical fiber
It is propagated respectively along opposite clockwise and counterclockwise in ring, and two-beam meets coherent condition.When fiber optic loop is around central shaft
After rotating, Sagnac effect is produced, so that the interference light intensity at the second coupler changes；By photodetector
The light intensity of variation is detected, after processing up to rotational angular velocity.
The utility model provides a kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers, including light source, spy
Survey device, the first coupler, the second coupler, fiber optic loop and phase-modulator；The light source is SLD light source or ASE light source；Light
Source and detector are connect with the first coupler respectively；Second coupler is connected with the both ends of fiber optic loop；It is characterized in that also
Including 45 ° of inclined optical fiber grating polarizers, 45 ° of inclined optical fiber grating polarizers both ends respectively with the first coupler and
Two couplers are connected.
Further, above-mentioned first coupler and the second coupler are connected by its tail optical fiber；Second coupler uses
Polarization-maintaining coupler, tail optical fiber are polarization maintaining optical fibre, 45 ° of inclined optical fiber gratings are inscribed on the tail optical fiber of the second coupler, shape is at 45 ° to incline
The oblique fiber grating polarizer；Alternatively, tail optical fiber is polarization maintaining optical fibre, the when first coupler uses polarization-maintaining coupler
45 ° of inclined optical fiber gratings, the shape inclined optical fiber grating polarizer at 45 ° are inscribed on the tail optical fiber of one coupler.
Further, the operating central wavelength of above-mentioned 45 ° of inclined optical fiber gratings is 850nm or 1310nm or 1550nm,
Operation wavelength bandwidth is 100nm~200nm, is polarized direction along polarization maintaining optical fibre fast axle or slow-axis direction, and extinction ratio is 20dB
~50dB.
Further, above-mentioned phase-modulator is piezoelectric ceramic phase；Piezoelectric ceramics phase is added in the optical path
Modulator further improves the sensitivity of detection system, and after ovennodulation, demodulation, which has obtained high sensitivity and same
When can distinguish again positive and negative rotation linearisation output.
Further, above-mentioned light source is using coaxial packaging light source or butterfly-type packaged light source or straight cutting packaged light source.According to reality
Border needs choosing multiple form packaged light source, and the parameters such as light intensity, structure can be made to be easier to adjust, and high reliablity is batch
It is good.
Further, above-mentioned first coupler is using drawing cone coupler or crystal light splitting coupler；Second coupler uses
Draw cone coupler or crystal light splitting coupler or micro-optics coupler.
Further, above-mentioned detector uses coaxial packaging, and its reliability is high, electromagnetism interference, good product consistency.
Further, the polarization maintaining optical fibre that above-mentioned polarization maintaining optical fibre is 125 μm in addition to traditional covering can be used, also can be used covering
For 80 μm or 60 μm of polarization maintaining optical fibre, polarization crosstalk is small, and at low cost, corollary equipment is complete.
Currently, 45 ° of inclined optical fiber gratings of open report are mainly used in optical fiber laser, optical fibre device and imaging side
Face.
Initially, Britain Aston university, which reports, realizes 1.5 mu m waveband mode-locked fiber lasers using 45 ° of inclined optical fiber gratings
Device (Optics Express, Vol.18, No.18,18906,2010).
It is inclined that Xian Inst. of Optics and Precision Mechanics, Chinese Academy of Sciences using 45 ° of inclined optical fiber gratings realizes 1 μm of wave band list
It shakes mode locked fiber laser (Optics Express, Vol.20, No.17,19000,2012).
Aston university of Britain devises complete optical fiber polarization interference filter (Optics using 45 ° of inclined optical fiber gratings
Letters, Vol.37, No.3,353,2012), and the filtering to laser output orphan's sideband is realized with the filter
(Optics Letters,Vol.37,No.21,4522,2012)。
Nearly 2 years articles report also still concentrates on the application of optical fiber laser, such as: utilize 45 ° of inclined optical fiber gratings
1.5 μm of narrow linewidth mode-locked lasers (Optics Express, Vol.25, No.14,16708,2017), nanosecond tune Q are made
Laser (Applied Optics, Vol.56, No.12,3583,2017) and some other type optical fiber laser
(Optics Communications,Vol.406,151,2017；25th International Conference on
Optical Fiber Sensors(OFS),SPIE,10323,2017)。
In addition, 2016,45 ° of inclined optical fiber gratings be applied in imaging system (Optics Letters, Vol.41,
No.11,2398,2016)。
Due to the main research of 45 ° of inclined optical fiber gratings, the Aston university that production unit is Britain, the country has the device
Part production ability is more limited to the only a fews list such as Xian Inst. of Optics and Precision Mechanics, Chinese Academy of Sciences, Central China University of Science and Technology
Position, has no 45 ° of inclined optical fiber grating products with High Extinction Ratio in the market, and independent research, production have 45 ° of High Extinction Ratio
Inclined optical fiber grating technical difficulty is big, threshold is high；More importantly because the operation wavelength of 45 ° of inclined optical fiber gratings is mainly 1
μm and 1.5 mu m wavebands, operation wavelength lack its application in optical fibre gyro that limits of 850nm, 1310nm wave band, it is public
The characteristics of crowd is for 45 ° of inclined optical fiber grating polarizers and production method understanding are limited, do not find it in open-loop optical fiber gyro
The potentiality of application.
45 ° of inclined optical fiber gratings are polarized principle are as follows: the fiber grating refraction index changing very little (10 made by ultraviolet light-5
~10-3Magnitude), different refractivity ratio is almost 1, and being computed its Brewster's angle is 45 °.Therefore, work as fiber grating inclination
When angle is 45 °, according to Brewster's law, a branch of non-polarized light passes through 45 ° of inclined optical fiber gratings, and the light of s polarization state is anti-
It is shot out, the light of p-polarization state continues to transmit, and is polarized effect to generate.
Compared with prior art, the utility model replaces original Y waveguide to be polarized using 45 ° of inclined optical fiber grating polarizers
Device realize single polarization generation, it can be achieved that open-loop optical fiber gyro multinomial performance promotion, have the following beneficial effects:
1, the stability and reliability of open-loop optical fiber gyro are improved.45 ° of inclined optical fiber gratings itself are optical fiber input
It exports and there is good impact resistance (> 100G), sky is not present using the open-loop optical fiber gyro of 45 ° of inclined optical fiber grating polarizers
Between optical coupling, realize all optical fibre structure of system, stability, reliability are greatly improved, can cope with more acutely, it is complicated
Application environment.
2, smallerization of open-loop optical fiber gyro is realized.45 ° of inclined optical fiber grating polarizers have all optical fibre structure, volume
It is small, flexible, it is suitble to the optical path assembling of miniaturization open-loop optical fiber gyro and integrates, it, can pole compared to the Y waveguide using block structure
The volume of big reduction open-loop optical fiber gyro.
3, open-loop optical fiber gyro more low-power consumption is realized.Generally there are the intrinsic Insertion Loss of 3dB and 2 for the Y waveguide that the prior art uses
~4dB coupling loss, and 45 ° of inclined optical fiber grating polarizers are due to its all optical fibre structure, almost there is only the intrinsic Insertion Loss of 3dB,
Therefore open-loop optical fiber gyro power consumption performance can promote about 1 times.
4, the simpler structure design of open-loop optical fiber gyro and technique are realized.Using 45 ° of inclined optical fiber grating polarizer phases
It for the scheme using Y waveguide, does not need to exclusively carry out and is polarized device space structure design and fixation in optical fibre gyro, be not necessarily to
Special package has simpler technique and production process.
5, the more inexpensive of open-loop optical fiber gyro is realized.The production and encapsulation of Y waveguide are relative complex, expensive；And 45 °
The price of inclined optical fiber grating can save a large amount of cost for a large amount of open-loop optical fiber gyro market demand lower than Y waveguide.
Detailed description of the invention
Fig. 1 is the utility model open-loop optical fiber gyro one embodiment light path part structure principle chart；
Fig. 2 is the structural schematic diagram of 45 ° of inclined optical fiber grating polarizer one embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Open-loop optical fiber gyro as shown in Figure 1 based on 45 ° of inclined optical fiber grating polarizers, including SLD light source, detector,
First coupler, 45 ° of inclined optical fiber grating polarizers, the second coupler, fiber optic loop and phase-modulator；Phase-modulator uses
Piezoelectric ceramic phase, the first coupler, the second coupler are all made of drawing cone coupler.
SLD light source is driven by a light source driving circuit.Referring to Fig. 1, SLD light source and detector are located at the same of the first coupler
Side is connect with the first coupler respectively；Second coupler is connected with the both ends of fiber optic loop by polarization maintaining fiber pigtail；First
Coupler and the second coupler are connected by its tail optical fiber；Second coupler uses polarization-maintaining coupler, and tail optical fiber is polarization maintaining optical fibre,
Inscribe 45 ° of inclined optical fiber gratings on the tail optical fiber of second coupler, the central wavelength of 45 ° of inclined optical fiber gratings be 850nm or
1310nm or 1550nm, operation wavelength bandwidth are 100nm~200nm, are polarized direction along polarization maintaining optical fibre fast axle or slow axis side
To, and extinction ratio is 20dB~50dB.45 ° of inclined optical fiber grating polarizers are ultimately formed, referring to fig. 2.
The present embodiment uses 45 ° of inclined optical fiber gratings of 1.3 mu m wavebands, and manufacturing process is as follows:
Photosensitizer processing in 48 hours is carried out to 1.3 μm of polarization maintaining optical fibres first, then passes through amplification shaft system calibration polarization-maintaining
The speed of optical fiber is axial, by theoretical calculation select mask plate cycle parameter 1515nm, 33.7 degree of tilt angle parameter, utilization
The method of the ultraviolet optical scanning phase mask plate of 244nm makes 1.3 mu m waveband inclined optical fiber gratings along polarization maintaining optical fibre fast axle or slow axis.
After actual measurement, extinction ratio the > 20dB, spectral bandwidth > of 45 ° of 1.3 mu m waveband of production inclination polarization-maintaining fiber gratings
100nm。
Realize that the scheme of open-loop optical fiber gyro has obtained actual verification using 45 ° of inclined optical fiber grating polarizers.Using
1.3 mu m waveband, the 45 ° of inclined optical fiber grating polarizers made on polarization maintaining optical fibre, realize open-loop optical fiber gyro, the structure open loop
Fiber-optics gyroscope index reaches same kind of products at abroad level, and has passed through high and low temperature environment test, presents good stabilization
Property.
Claims (8)
1. a kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers, including light source, detector, the first coupler,
Second coupler, fiber optic loop and phase-modulator；The light source is SLD light source or ASE light source；Light source and detector are respectively with
The connection of one coupler；Second coupler is connected with the both ends of fiber optic loop；
It is characterized by also including 45 ° of inclined optical fiber grating polarizers, 45 ° of inclined optical fiber grating polarizer both ends difference
It is connected with the first coupler and the second coupler.
2. the open-loop optical fiber gyro according to claim 1 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
First coupler and the second coupler are connected by its tail optical fiber；
Second coupler uses polarization-maintaining coupler, and tail optical fiber is polarization maintaining optical fibre, and 45 ° are inscribed on the tail optical fiber of the second coupler
Inclined optical fiber grating, the shape inclined optical fiber grating polarizer at 45 °；
Alternatively, tail optical fiber is polarization maintaining optical fibre, in the tail optical fiber of the first coupler when first coupler uses polarization-maintaining coupler
45 ° of inclined optical fiber gratings of upper inscription, the shape inclined optical fiber grating polarizer at 45 °.
3. the open-loop optical fiber gyro according to claim 2 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
The operating central wavelength of 45 ° of inclined optical fiber gratings is 850nm or 1310nm or 1550nm, and operation wavelength bandwidth is
100nm~200nm is polarized direction along polarization maintaining optical fibre fast axle or slow-axis direction, and extinction ratio is 20dB~50dB.
4. the open-loop optical fiber gyro according to claim 3 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
The phase-modulator is piezoelectric ceramic phase.
5. the open-loop optical fiber gyro according to claim 4 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
The light source is using coaxial packaging light source or butterfly-type packaged light source or straight cutting packaged light source.
6. the open-loop optical fiber gyro according to claim 5 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
First coupler is using cone coupler or crystal light splitting coupler is drawn, and second coupler is using drawing cone coupler or crystalline substance
Body light splitting coupler or micro-optics coupler.
7. the open-loop optical fiber gyro according to claim 6 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
The detector uses coaxial packaging.
8. the open-loop optical fiber gyro according to claim 7 based on 45 ° of inclined optical fiber grating polarizers, it is characterised in that:
The polarization maintaining optical fibre that covering is 60 μm or 80 μm or 125 μm can be used in the polarization maintaining optical fibre.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680152A (en) * | 2018-06-21 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | A kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680152A (en) * | 2018-06-21 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | A kind of open-loop optical fiber gyro based on 45 ° of inclined optical fiber grating polarizers |
| CN108680152B (en) * | 2018-06-21 | 2024-03-08 | 西安中科华芯测控有限公司 | Open-loop fiber optic gyroscope based on 45-degree inclined fiber optic grating polarizer |
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