CN1448697A - Self-injection locking fibre-optical laser circulator - Google Patents
Self-injection locking fibre-optical laser circulator Download PDFInfo
- Publication number
- CN1448697A CN1448697A CN 02112846 CN02112846A CN1448697A CN 1448697 A CN1448697 A CN 1448697A CN 02112846 CN02112846 CN 02112846 CN 02112846 A CN02112846 A CN 02112846A CN 1448697 A CN1448697 A CN 1448697A
- Authority
- CN
- China
- Prior art keywords
- fiber
- laser
- gain
- ring
- dfb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Lasers (AREA)
- Gyroscopes (AREA)
Abstract
The present invention relates to optical gyro, and is especially fiber laser gyro comprising fiber laser, detector and differential frequency processing circuit. It features that the fiber laser consists of semiconductor laser with tail fiber, single-frequency distributed feedback fiber laser DFB, fiber ring and fiber coupler, with the fiber ring comprising wavelength division multiplexer, isolator, gain fiber and fiber coupler. Two fiber rings with gain fiber forms two independent resonant cavities, into which the DFB injects seed laser to lock their work wavelength. The isolator makes the laser work in single-direction traveling wave state, and the laser transmission direction is clockwise in one ring and counterclockwise in the other. The present invention eliminates spatial hole burning in homogeneously expanded gain medium and interlock effect caused by back scattering, and makes laser in two ring cavities work in narrow-line width single-longitudinal mode state.
Description
Technical field:
The present invention relates to optical gyroscope, relate in particular to optical fiber laser peg-top.
Background technology:
Gyro is as a kind of important sensor, important use arranged in the location of satellite, aircraft, naval vessel, automobile, orientation, navigation etc. aspect dual-use.Optical gyroscope of new generation (as: laser gyro, interference optical fiber top etc.) based on Sagnac (Sagnac) effect has caused people's research interest.Laser gyro is as first generation product, in low precision Application for Field entered practicability.It adopts the difference frequency signal detection mode, and it is comparatively convenient that electronics is handled, and the signal Processing precision is higher; But defective effects such as discrete optical element and life-span are short, volume is big, weight is big the application of laser gyro in the high precision field.As the interference optical fiber top of second generation product, its full consolidated structures causes people's very big interest.Simultaneously it also has advantages such as power consumption is little, the life-span is long, volume is little, in light weight, in development is preferably also arranged in the application of low accuracy requirement; But interference optical fiber top adopts phase-detection, electronics is handled comparatively complicated, simultaneously, problems such as noise, stability, dynamic range and scale factor linearization have limited the further raising of fiber optic gyroscope performance, have equally also influenced the application of interference optical fiber top in the high precision field.Development along with fiber laser, people just wish and the advantage of full advantage of solidifying of optical fibre gyro and the processing of laser gyro difference frequency signal can be combined, develop high performance optical fiber laser peg-top, to satisfy the more requirement of high-precision applications field (as inertial navigation).
The high-performance optical fiber laser gyro has two key requests: 1. gain media should be able to provide directional gain, produces gain competition with the laser of avoiding transmitting in opposite directions; 2. back scattering must be able to be ignored, to eliminate latch up effect.The optical fiber laser peg-top that has proposed at present, as Chinese patent application CN1320821A " laser gyro with optical fibre ring ", its core is the single frequency optical fiber laser of narrow linewidth, its utilize Mach-once the interferometer multiple-stage filtering be realized the fiber laser single frequency operation, with two paths of signals laser from the space separately, to avoid occurring the competition of clockwise and counterclockwise two paths of signals laser because of shared gain.But, single-stage Mach-once the relative broad of filtering bandwidth of interferometer, need to use multistage Mach-once the long controller of interferometer and chamber, make complexity of ring cavity structure, precision and sensitivity are affected.
Summary of the invention:
The object of the present invention is to provide a kind of new optical gyroscope, i.e. self-injection locking fibre-optical laser circulator, it can solve gain competition and latch up effect problem, can make again simple in structure, volume is small and exquisite, Gyro Precision and sensitivity improve.
The present invention realizes in the following manner:
Self-injection locking fibre-optical laser circulator is made up of fiber laser and detector, difference frequency signal treatment circuit, wherein fiber laser is made up of semiconductor laser, single-frequency distributed feedback optical fiber laser DFB, fiber optic loop, the fiber coupler of magnetic tape trailer fibre, fiber optic loop then is made up of wavelength division multiplexer, isolator, gain fibre and fiber coupler, and concrete structure is: with the semiconductor laser LD of two magnetic tape trailer fibres
1And LD
2Respectively by wavelength division multiplexer WDM
1And WDM
2Be connected with the two ends of DFB; WDM then
1And WDM
2Respectively with isolator I
1And I
2, gain fibre GF
1And GF
2Link to each other I
1And I
2, GF
1And GF
2Again respectively with fiber coupler C
1And C
2Link to each other separately, form band two fiber optic loop gain, that direction is opposite; Fiber coupler C
1And C
2An output terminal more respectively with fiber coupler C
3Two input ends be connected C
3Two output terminals respectively with detector PD
1And PD
2Link to each other PD
1Or PD
2Be connected with the difference frequency signal treatment circuit again.
That is to say, the present invention is that the topological structure by the fiber laser with self-injection locking effect constitutes optical fiber laser peg-top, and promptly the fiber laser as the optical fiber laser peg-top core component is the single frequency optical fiber laser (its concrete structure as shown in the figure) of two-way self-injection locking.It is the semiconductor laser LD that utilizes two magnetic tape trailer fibres
1And LD
2As pumping source, for single-frequency distributed feedback optical fiber laser DFB provides pump power, be injected into separately the other way around then in the fiber optic loop, the signal laser that inverted running is also locked takes out from fiber optic loop and surveys and handle again.The pump power of two fiber optic loop is also by LD
1And LD
2Provide respectively.LD
1And LD
2Respectively by wavelength division multiplexer WDM
1And WDM
2Be connected LD with the two ends of DFB
1And LD
2Wavelength decide on the absorption peak of operation material in the gain fibre that DFB adopted (or claiming Active Optical Fiber), common pumping wavelength has 650nm, 780nm, 800nm, 915nm, 980nm and 1480nm etc., output power is generally selected to be advisable greater than 100mW; DFB directly is produced on the gain fibre, gain fibre should be selected highly doped rare-earth doped optical fibre or other doped fibers (as: doping is above er-doped or a Yb dosed optical fiber of 800ppm) for use, its length is generally about 3～10cm, can provide stable in opposite directions single longitudinal mode seed laser (halfwidth of line of DFB output wavelength should less than the longitudinal mode spacing of fiber optic loop) to two fiber optic loop; WDM
1And WDM
2Has identical characterisitic parameter, at the operation wavelength of pumping source wavelength and signal laser and select.Wavelength division multiplexer WDM
1, isolator I
1, fiber coupler C
1And gain fibre GF
1Between link to each other, form a fiber optic loop 1, wavelength division multiplexer WDM by single-mode fiber
2, isolator I
2, fiber coupler C
2And gain fibre GF
2Between also link to each other, form the ring cavity that 2, two fiber optic loop of another fiber optic loop are formed band gain separately by single-mode fiber, their direction is on the contrary, just the direction of isolator makes that the traffic direction of the signal laser that produces is opposite in two fiber optic loop.Wherein, two isolator I
1And I
2Also be to have identical characterisitic parameter, its return loss surpasses 60dB at the signal laser wavelength; The gain fibre that is adopted in two fiber optic loop is identical with the material among the DFB, and its length is generally decided according to optic fibre characteristic and concrete applied environment, makes one's options can be from several centimetres to several meters, as long as can make generation signal laser in the fiber optic loop; The length of fiber optic loop (being ring cavity) is adjusted by single-mode fiber, generally just can satisfy higher application accuracy requirement (the chamber length of two ring cavitys is difference slightly, makes that there is a difference on the frequency in the laser work frequency in two chambeies) from several meters to tens meters.Fiber coupler C in two fiber optic loop
1And C
2An output terminal more respectively with another fiber coupler C
3Two input ends be connected C
3Two output terminals then respectively with detector PD
1And PD
2Link to each other PD
1Or PD
2Be connected with the difference frequency signal treatment circuit again.C
1And C
2Coupling ratio select to be 98: 2, C
3Coupling ratio to be chosen as 1: 1 be 3dB; Detector can be selected common PIN photodetector or avalanche photodetector.
This clearly demarcated course of work is as follows:
Under the pumping of two semiconductor lasers, the fiber optic loop of two band gain fibres has formed two resonator cavitys independently separately.In two fiber optic loop, inject seed laser respectively by DFB, the operation wavelength in two resonator cavitys is locked.The wavelength of the signal laser of locking is determined by the condition of resonance of two ring cavitys and the wavelength of DFB respectively; The isolator that adds respectively in two optic fiber ring-shaped cavities makes signal laser be operated in the unidirectional traveling wave state, and the Laser Transmission direction is a clockwise direction in a ring, and the transmission direction of laser is counterclockwise in another ring; The spatial hole burning phenomenon that causes in the even broadening gain media (being gain fibre) in the fiber optic loop has been eliminated in the work of signal laser unidirectional traveling wave, adds the injection locking of DFB, makes two laser works in the ring cavity at the very narrow stable single longitudinal mode state of live width; And, can eliminate the latch up effect that causes because of back scattering well owing to the return loss of isolator can be accomplished greater than 60dB.The holding position phased constant becomes two coherent lights to the single longitudinal mode signal laser of two ring cavity outputs owing to the injection locking of DFB, thereby can adopt difference frequency signal to detect; The frequency of operation of two signal lasers is owing to there is a difference on the frequency in the long slightly difference of optical fiber ring cavity, this original frequency difference both can be used for eliminating because of signal laser itself has measurement blind area that certain live width brings to improve measuring accuracy, also can be used to judge the direction of rotational angular velocity.
The frequency of operation of supposing when static signal laser in the ring is ν
1, the frequency of operation of signal laser is ν in another ring
2, then when ring rotates along clockwise angular velocity with Ω, according to the Sagnac effect, the frequency of two signal lasers will become:
ν
1′＝ν
1+(2A
1/λ
0L
1)Ω 〔1〕
ν
2′＝ν
2-(2A
2/λ
0L
2)Ω 〔2〕
In the formula, A
1And L
1Be respectively the area and the length of ring 1, A
2And L
2Be respectively the area and the length of ring 2, λ
0Be in a vacuum wavelength of laser (, thinking that the operation wavelength when they are static is identical) because the initial difference on the frequency of two laser is very little.
After then rotating, the difference on the frequency of two signal lasers is:
Δν＝ν
2′-ν
1′
＝(ν
2-ν
1)-(2A
2/λ
0L
2+2A
1/λ
0L
1)Ω 〔3〕
When fiber optic loop with the angular velocity of Ω when being rotated counterclockwise, then the frequency of two signal lasers becomes:
ν
1″＝ν
1-(2A
1/λ
0L
1)Ω 〔4〕
ν
2″＝ν
2+(2A
2/λ
0L
2)Ω 〔5〕
Then the difference on the frequency of two signal lasers is:
Δν＝ν
2″-ν
1″
＝(ν
2-ν
1)+(2A
2/λ
0L
2+2A
1/λ
0L
1)Ω 〔6〕
Then as can be known, detect the frequency difference of two laser, can measure rotational angular velocity by difference frequency by (3) and (6) two formulas; And frequency difference was also inequality when rotation direction was different, therefore also can judge rotation direction according to frequency difference.
Advantage of the present invention is:
1, the seed laser of DFB generation injects the single-frequency laser that produces clockwise and counterclockwise both direction respectively.Not only two signal lasers that transmit are in opposite directions spatially separated, made it not have shared gain, can produce stable two-way signaling laser output; And, utilize injection locking that the position of two signal lasers is kept constant mutually, coherent light makes it to adopt difference frequency to detect each other.
2, adopt isolator to suppress back scattering (surpassing 60dB), can eliminate latch up effect, also eliminated the effects of spatial of gain media simultaneously, pressed the work live width of signal laser narrow, thereby improved the sensitivity and the measuring accuracy of gyro.
3, by regulating the length difference of two fiber optic loop, directly realize the shift frequency of optical fiber laser peg-top and need not other additional components and parts, not only make two laser have initial frequency difference, both helped the raising of rotational angular velocity measuring accuracy, also can judge rotation direction according to frequency difference; But also simplified the structure of gyro greatly.
4,, only need several meters just can reach navigation request (for example the long 5m of optical fiber ring cavity can reach 10 because the injection locking of DFB makes that the frequency change slope of signal laser is big, highly sensitive
-3Measuring accuracy), thereby accuracy of detection height, dynamic range are big.
5, whole gyro is full optical fiber curing structure, and used components and parts are common components, no specific (special) requirements, thus simple in structure, make easily, and power consumption is little, the life-span is long, volume is little, in light weight.
6,, also make the influence that the even drift that causes of temperature distributing disproportionation can be ignored, mechanical shock produces very little, thereby have very high stability because the chamber is long shorter.
The present invention is applicable to orientation, location, the navigation of satellite, aircraft, naval vessel, automobile etc.Because it has very high precision, sensitivity and stability, therefore be suitable for satellite inertial navigation and flight attitude adjustment; Also can be used as the important inertial navigation set or the device of aerospacecraft high-precision independent orbit determination, self-navigation.
Description of drawings:
Accompanying drawing 1 is a structural representation of the present invention.
Embodiment:
Below in conjunction with accompanying drawing embodiments of the invention are described.As can be seen from Figure, semiconductor laser LD is the pump laser that is generally used for Erbium-Doped Fiber Amplifier (EDFA), and model is QLM9S470-915, and operation wavelength is 980nm, and output power is 150mW; DFB is the single frequency optical fiber laser of er-doped, its two-way output power 0.25mW, wavelength 1.546 μ m, live width 2MHz; Two optical fiber ring cavities are about and are 4m, and longitudinal mode spacing is about 50MHz, fiber optic loop coiled 4 rings, and the ring radius is about 15.9cm, and wherein gain fibre GF adopts Er-doped fiber, gain to be 15dB/m; Isolator adopts CASIX product (A level), return loss 65dB, peak value isolation 42dB; Coupling mechanism C
1And C
2Coupling ratio be 98: 2, wherein 2% is to draw as detectable signal C in the chamber
3Coupling ratio be that 1: 1 (being 3dB) interferes two laser difference frequencies; Wavelength division multiplexer WDM is 980/1550nm, and isolation is greater than 30dB; Two fiber optic loop overlap.Detector adopts the PIN photodetector, and peak wavelength is 1550nm, and whole gyro is full fiberize, is solidificated on the indium steel plate.
Claims (1)
1, a kind of self-injection locking fibre-optical laser circulator, form by fiber laser and detector, difference frequency signal treatment circuit, it is characterized in that fiber laser is made up of semiconductor laser, single-frequency distributed feedback optical fiber laser DFB, fiber optic loop, the fiber coupler of magnetic tape trailer fibre, fiber optic loop then is made up of wavelength division multiplexer, isolator, gain fibre and fiber coupler, and concrete structure is: with the semiconductor laser LD of two magnetic tape trailer fibres
1And LD
2Respectively by wavelength division multiplexer WDM
1And WDM
2Be connected with the two ends of DFB; WDM then
1And WDM
2Respectively with isolator I
1And I
2, gain fibre GF
1And GF
2Link to each other I
1And I
2, GF
1And GF
2Again respectively with fiber coupler C
1And C
2Link to each other separately, form band two fiber optic loop gain, that direction is opposite; Fiber coupler C
1And C
2An output terminal more respectively with fiber coupler C
3Two input ends be connected C
3Two output terminals respectively with detector PD
1And PD
2Link to each other PD
1Or PD
2Be connected with the difference frequency signal treatment circuit again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112846 CN1264000C (en) | 2002-04-03 | 2002-04-03 | Self-injection locking fibre-optical laser circulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112846 CN1264000C (en) | 2002-04-03 | 2002-04-03 | Self-injection locking fibre-optical laser circulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448697A true CN1448697A (en) | 2003-10-15 |
| CN1264000C CN1264000C (en) | 2006-07-12 |
Family
ID=28680566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02112846 Expired - Fee Related CN1264000C (en) | 2002-04-03 | 2002-04-03 | Self-injection locking fibre-optical laser circulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1264000C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216314B (en) * | 2008-01-14 | 2010-06-02 | 浙江大学 | Resonance type optical gyroscope digital closed loop system frequency feedback and tracking locking apparatus and method |
| CN101532838B (en) * | 2009-04-09 | 2011-01-05 | 浙江大学 | Triaxial integration resonant mode optical fiber gyro for optical path multiplexing |
| CN101995246A (en) * | 2010-08-13 | 2011-03-30 | 北京大学 | Laser gyroscope based on parallel feedback |
| CN102455301A (en) * | 2011-04-08 | 2012-05-16 | 安徽农业大学 | Laser coherence detection device for ceramic product surface defect |
| CN110319828A (en) * | 2019-07-24 | 2019-10-11 | 哈尔滨工程大学 | A kind of the resonance type optical fiber gyro system and its signal detecting method of bicyclic cavity configuration |
| CN110470292A (en) * | 2019-08-30 | 2019-11-19 | 哈尔滨工程大学 | A kind of self seeding frequency locking resonance type optical gyroscope and its working method |
| CN110651167A (en) * | 2017-05-30 | 2020-01-03 | 加州理工学院 | Integrated optical gyroscope with noise cancellation |
| CN112066975A (en) * | 2020-09-25 | 2020-12-11 | 中北大学 | Gyroscope and accelerometer integrated system based on double resonant cavities and preparation method thereof |
| CN112113556A (en) * | 2020-08-28 | 2020-12-22 | 哈尔滨工程大学 | High-sensitivity resonant micro-optical gyroscope based on self-injection frequency locking and detection method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101169324B (en) * | 2006-10-23 | 2010-09-29 | 北京理工大学 | Photon infusion saturated absorption mode-locking type optical fiber laser peg-top |
| US11506495B2 (en) | 2020-07-27 | 2022-11-22 | Honeywell International Inc. | Injection locking resonator fiber optic gyroscope |
-
2002
- 2002-04-03 CN CN 02112846 patent/CN1264000C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216314B (en) * | 2008-01-14 | 2010-06-02 | 浙江大学 | Resonance type optical gyroscope digital closed loop system frequency feedback and tracking locking apparatus and method |
| CN101532838B (en) * | 2009-04-09 | 2011-01-05 | 浙江大学 | Triaxial integration resonant mode optical fiber gyro for optical path multiplexing |
| CN101995246A (en) * | 2010-08-13 | 2011-03-30 | 北京大学 | Laser gyroscope based on parallel feedback |
| CN101995246B (en) * | 2010-08-13 | 2012-11-07 | 北京大学 | Laser gyroscope based on parallel feedback |
| CN102455301A (en) * | 2011-04-08 | 2012-05-16 | 安徽农业大学 | Laser coherence detection device for ceramic product surface defect |
| CN110651167A (en) * | 2017-05-30 | 2020-01-03 | 加州理工学院 | Integrated optical gyroscope with noise cancellation |
| CN110651167B (en) * | 2017-05-30 | 2023-10-31 | 加州理工学院 | Integrated optical gyroscope with noise cancellation |
| CN110319828B (en) * | 2019-07-24 | 2022-09-27 | 哈尔滨工程大学 | Resonant fiber-optic gyroscope system with double-ring cavity structure and signal detection method thereof |
| CN110319828A (en) * | 2019-07-24 | 2019-10-11 | 哈尔滨工程大学 | A kind of the resonance type optical fiber gyro system and its signal detecting method of bicyclic cavity configuration |
| CN110470292A (en) * | 2019-08-30 | 2019-11-19 | 哈尔滨工程大学 | A kind of self seeding frequency locking resonance type optical gyroscope and its working method |
| CN110470292B (en) * | 2019-08-30 | 2023-08-01 | 哈尔滨工程大学 | Self-injection frequency-locking resonant optical gyroscope and working method thereof |
| CN112113556B (en) * | 2020-08-28 | 2022-06-24 | 哈尔滨工程大学 | High-sensitivity resonant micro-optical gyroscope based on self-injection frequency locking and detection method thereof |
| CN112113556A (en) * | 2020-08-28 | 2020-12-22 | 哈尔滨工程大学 | High-sensitivity resonant micro-optical gyroscope based on self-injection frequency locking and detection method thereof |
| CN112066975B (en) * | 2020-09-25 | 2021-05-14 | 中北大学 | Gyroscope and accelerometer integrated system based on double resonant cavities and preparation method thereof |
| CN112066975A (en) * | 2020-09-25 | 2020-12-11 | 中北大学 | Gyroscope and accelerometer integrated system based on double resonant cavities and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1264000C (en) | 2006-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7283216B1 (en) | Distributed fiber sensor based on spontaneous brilluoin scattering | |
| CN107843248B (en) | Self-injection locking resonant optical gyroscope and working method thereof | |
| Meng et al. | Stable single-mode operation of a narrow-linewidth, linearly polarized, erbium-fiber ring laser using a saturable absorber | |
| US6630658B1 (en) | Fiber laser pressure sensor | |
| US9568319B2 (en) | Angular velocity detection method adopting bi-directional full reciprocal coupling optoelectronic oscillator | |
| EP0470710B1 (en) | Optical waveguide amplifier source gyroscope | |
| CN1264000C (en) | Self-injection locking fibre-optical laser circulator | |
| EP2698605B1 (en) | Fiber resonator gyroscope with low round trip loss and high output power | |
| CN100423384C (en) | Single frequency tunable doped erbium optical fiber laser system | |
| CA3125242A1 (en) | Gain-coupled resonator gyroscope | |
| CA2050538C (en) | Residual pump light attenuating fibre using yb and erbium atoms in rotation sensor systems | |
| CN111129923B (en) | Single-frequency and single-polarization optical fiber distributed feedback laser | |
| Iwatsuki | Excess noise reduction in fiber gyroscope using broader spectrum linewidth Er-doped superfluorescent fiber laser | |
| CN110838671A (en) | Single-frequency optical fiber laser | |
| US9562768B2 (en) | Active waveguide optical gyroscope | |
| Liu et al. | Enhancement of sensitivity near exceptional point by constructing nonreciprocal fiber cavity assisted by isolator and erbium-doped fiber | |
| Ford et al. | Cavity element for resonant micro optical gyroscope | |
| CN112113556A (en) | High-sensitivity resonant micro-optical gyroscope based on self-injection frequency locking and detection method thereof | |
| Fesler et al. | Behavior of broadband fiber sources in a fiber gyroscope | |
| CN104655119A (en) | Self-injection-locking optical fiber laser gyroscope | |
| CN113310480B (en) | Optical gyroscope system based on silicon nitride waveguide resonant cavity | |
| Ashley et al. | Applications of SLDs in fiber optical gyroscopes | |
| CN100588056C (en) | Single-frequency single-polarization liner cavity ytterbium-doping optical fiver laser | |
| Chopra et al. | Fiber-optical gyroscopes | |
| Wang et al. | The characterizations of polarization in resonator integrated optic gyroscope |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |