CN107990886A - There is the high-precision optical fiber gyro light channel structure for suppressing relative intensity noise - Google Patents
There is the high-precision optical fiber gyro light channel structure for suppressing relative intensity noise Download PDFInfo
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- CN107990886A CN107990886A CN201711390288.8A CN201711390288A CN107990886A CN 107990886 A CN107990886 A CN 107990886A CN 201711390288 A CN201711390288 A CN 201711390288A CN 107990886 A CN107990886 A CN 107990886A
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- noise
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- relative intensity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
Abstract
The present invention relates to a kind of high-precision optical fiber gyro light channel structure for having the function of to suppress relative intensity noise, including ASE light sources, detector, coupler, Y waveguide integrated optical device and polarization-maintaining fiber coil, its technical characteristics to be：Semiconductor optical amplifier is equipped between ASE light sources and coupler, ASE light sources are divided into two-way after semiconductor optical amplifier, coupler, Y waveguide integrated optical device and enter polarization-maintaining fiber coil, and the interference light come out from polarization-maintaining fiber coil is by entering detector after coupler.The present invention adds the semiconductor optical amplifier (SOA) for being operated in saturation region in fiber-optic gyroscope light path, suppresses noise using the optical characteristics of semiconductor optical amplifier, so as to restrained effectively the relative intensity noise of light source, improves optical fiber gyroscope precision；Use semiconductor optical amplifier at the same time, it is not necessary to increase extra noise suppressed passage and backfeed loop, demodulator circuit design difficulty and gyro debugging difficulty will not be increased, its implementation is easy and effective.
Description
Technical field
The invention belongs to fiber-optics gyroscope field, especially a kind of high accuracy for having the function of to suppress relative intensity noise
Fiber-optic gyroscope light path structure.
Background technology
White noise available random migration coefficient characterization in optical fibre gyro is right for superhigh precision fibre optic gyroscope
Its required precision is very stringent, and random walk coefficient requirement is less than a ten thousandth.Light path, circuit system noise and drift are limitations
The principal element of precision development, to develop superhigh precision optical fibre gyro, it is necessary to by the circuit of optical fibre gyro and light path noise
It is reduced to minimum.With the progress of circuit devcie performance and modulation and demodulation method, circuit noise has no longer been limit fibre top
The principal element that spiral shell develops towards higher precision, principal element become light path noise.Fiber-optic gyroscope light path noise can be divided into
Three classes：Detector thermal noise, shot noise and relative intensity noise (RIN).For the fiber-optic gyroscope light path shown in Fig. 1, it is made an uproar
The statistical models of acoustoelectric current are as follows：
Wherein,Respectively thermal noise, shot noise and light source relative intensity noise；σ2For light
The sum of fine gyro noise；kBFor Boltzmann constant, TkFor thermodynamic temperature, B is detection bandwidth, RfFor detector transimpedance, q
For electron charge,For the average current of detector, Δ ν is the bandwidth of light source.
Optical fibre gyro noise can be expressed as with signal-to-noise ratio：
In these noises, thermal noise is small more on the order of magnitude compared with shot noise, relative intensity noise, generally
In the case of be negligible.Therefore, formula (2) can be write as：
As can be seen that when photoelectric current is smallerWhen, the signal-to-noise ratio of optical fibre gyro is determined by shot noise；When
When photoelectric current is larger, optical fibre gyro signal-to-noise ratio will be determined by relative intensity noise.
ASE light sources have the advantages that power is big, wavelength stability is good, coherence is weak, be superhigh precision optical fibre gyro must
So selection.When ASE light source powers are smaller, optical fiber gyroscope precision is mainly limited by shot noise, can be by increasing light source work(
Rate lifts optical fiber gyroscope precision.But with the increase of power, light source relative intensity noise substitution shot noise is increasingly becoming gyro
Main Noise Sources, limit and improve improvement of the luminous power to gyro signal-to-noise ratio (and precision), random walk coefficient can not obtain
To reduction.
So suppress relative intensity noise becomes the key that Gyro Precision is further lifted, proposed in domestic and international patent
Some RIN suppression technologies, as square-wave frequency modulation it is intrinsic demodulation electricity phase subtract RIN suppression technologies, direct feedback inhibition light source is relatively strong
Noise technique is spent, such scheme belongs to electricity scheme, its circuit structure is complicated, and debugging difficulty is big, if parameter setting
It is unreasonable, not only the effect for suppressing noise cannot be played, extra noise can be also introduced, which has limited its answering in practice
With.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, proposes that a kind of design is reasonable, precision is high and realizes simple
Have the function of suppress relative intensity noise high-precision optical fiber gyro light channel structure.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of high-precision optical fiber gyro light channel structure for having the function of to suppress relative intensity noise, including ASE light sources, detection
Device, coupler, Y waveguide integrated optical device and polarization-maintaining fiber coil, are equipped with semiconductor optical amplification between ASE light sources and coupler
Device, ASE light sources are divided into two-way after semiconductor optical amplifier, coupler, Y waveguide integrated optical device and enter polarization maintaining optical fibre
Ring, the interference light come out from polarization-maintaining fiber coil is by entering detector after coupler.
The semiconductor optical amplifier selects partly leading for corresponding saturated light power parameter according to ASE source device output optical powers
Body image intensifer, suppresses the relative intensity noise of the output light of ASE light sources.
The advantages and positive effects of the present invention are：
The present invention adds in fiber-optic gyroscope light path and is operated in the semiconductor optical amplifier (SOA) of saturation region, using partly leading
The optical characteristics of body image intensifer suppresses noise, so as to restrained effectively the relative intensity noise of light source, improves optical fiber top
Spiral shell precision；Use semiconductor optical amplifier at the same time, it is not necessary to increase extra noise suppressed passage and backfeed loop, will not increase
Demodulator circuit design difficulty and gyro debugging difficulty, its implementation are easy and effective.
Brief description of the drawings
Fig. 1 interferes formula high-precision optical fiber gyro light channel structure figure for existing standard；
Fig. 2 is the structure chart of the present invention；
Fig. 3 is the semiconductor optical amplifier input-output curve for being operated in saturation region；
Fig. 4 is the noise contribution factor under different input optical powers | H (f, 0) |2；
Fig. 5 is relative intensity noise measurement scheme；
Fig. 6 is the RIN measured values of light path before coupler in optical fibre gyro.
Embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing.
A kind of high-precision optical fiber gyro light channel structure for having the function of to suppress relative intensity noise, as shown in Fig. 2, including
ASE light sources, detector, semiconductor optical amplifier (SOA), Y waveguide integrated optical device, coupler and polarization-maintaining fiber coil, it is described
Semiconductor optical amplifier (SOA) is arranged between ASE light sources and coupler, and ASE light sources amplify through semiconductor optical amplifier (SOA)
It is divided into two-way to coupler and after Y waveguide integrated optical device afterwards and enters polarization-maintaining fiber coil, is come out from polarization-maintaining fiber coil
Interference light is by entering detector after coupler.This high-precision optical fiber gyro light channel structure is in standard interference formula high-precision optical fiber
On the architecture basics of gyro, semiconductor optical amplifier (SOA) is added between ASE light sources and coupler, according to ASE light source outputs
Luminous power, selects the semiconductor optical amplifier of corresponding saturated light power parameter, semiconductor optical amplifier is operated in saturation region, profit
The relative intensity noise of the output light of ASE light sources is suppressed with the optical characteristics of semiconductor optical amplifier.Gyro light path its
His partly hardware and program with modulation-demodulation circuit, it is unchanged with unused optical fibre gyro of the invention.
The principle of the present invention is：The semiconductor optical amplifier for being operated in saturation region there is suppression to make the noise of its input light
With.Macroscopical aspect, semiconductor optical amplifier are amplified input light by stimulated emission.When increasing input optical power, by
Carrier density in the consumption of the stimulated emission of input light, semiconductor optical amplifier declines, and causes semiconductor optical amplifier
Gain decline.This gain decline i.e. the gain saturatiuon of semiconductor optical amplifier, it causes the non-linear of amplification characteristic.
Fig. 3 is the principle using gain saturatiuon semiconductor optical amplifier inhibition strength noise.The nonlinear area caused by gain saturatiuon
When being amplified input light, the fluctuation of luminous power is compressed, this is a side for suppressing RIN using saturation semiconductor optical amplifier
Face.
Gain saturatiuon semiconductor can also be analyzed from point of theory to the noisy matching of saturation semiconductor optical amplifier
Image intensifer suppresses principle to light source RIN.
By half classical analysis to electric field in semiconductor amplifier, position z can be obtained in amplifier to output terminal
Noise contribution expression formula：
In formula, z is position, and z=0 represents the input terminal of semiconductor optical amplifier, and z=L represents semiconductor optical amplifier
Output terminal；ρs(z) amplifier Electric Field Function E (t, z) amplitude when being no amplifier noise；F is frequency；τcFor carrier lifetime.
The noise contribution factor has arrowband property, is the fundamental characteristics of nonlinear semiconductor image intensifer.By | H (f, z) |2
As can be seen that | H (f, 0) |2It is maximized, | H (f, L) |2=1.It means that the major part of output noise is attributed to spontaneous spoke
Penetrate, be exaggerated when resulting from the unsaturated region (close to input terminal) of semiconductor optical amplifier, and being propagated along amplifier, saturation region
The usual very little of contribution of the domain to whole noise.By | H (f, 0) |2Can investigate different input power or different gains compression it is lower with
The size of the related noise contribution factor in position：
Wherein,PinFor
Input optical power, PsatFor saturation luminous power, G0For SOA small-signal gains, GcFor the gain compression of opposite small-signal gain.Bring into
Certain specification semiconductor optical amplifier parameter, Fig. 4 give the size of the noise contribution factor under different input optical powers, it can be seen that
Increase saturation optical power levels, the inhibition of intensity noise is obvious, up to more than 10dB.Only when semiconductor optical amplifier gain
Change can response intensity fluctuation when, this description is only correctly.Therefore, RIN noise suppresseds only in ＜ 5GHz (with semiconductor
The efficient carrier service life of image intensifer in relation to) low-frequency range it is effective, but to optical fibre gyro application for, it is enough.
The effect of the present invention is verified below by experiment：
After the relative intensity noise of test ASE light source output light and ASE light sources are followed by semiconductor optical amplifier respectively, partly lead
The relative intensity noise of the output light of body image intensifer, wherein SOA are operated in saturation region.RIN noise measurement systems such as Fig. 5 institutes
Show, input light to be measured is decayed by variable optical attenuator to match the input range of PIN-FET, passes through universal meter and frequency spectrum
Instrument can test the DC quantity and noise of PIN-FET output voltages, calculate the size of the RIN of input light.Fig. 6 is given not
With the different DC level variable quantity of input optical power, that is, detector under, the RIN noises that measure illustrates addition gain saturatiuon
SOA has ASE light source relative intensity noises the inhibition of 10dB or so, meets with theory analysis.
To sum up, on the architecture basics of standard interference formula optical fibre gyro, the present invention first suppresses semiconductor optical amplifier
The principle of noise is analyzed, and the relative intensity noise of gyro light source can be suppressed by demonstrating semiconductor optical amplifier, secondly
Propose optical fibre gyro and suppress the relative intensity noise solution of light source, and verification experimental verification has been carried out to scheme, the results showed that
The program can effectively suppress light source relative intensity noise, lift Gyro Precision.
By above scheme, do not increase extra noise suppressed passage and backfeed loop, do not increase demodulator circuit design
On the premise of difficulty and gyro debugging difficulty, light source relative intensity noise has been obtained effective suppression, lift optical fiber gyroscope precision.
It is emphasized that embodiment of the present invention is illustrative, rather than it is limited, therefore present invention bag
The embodiment being not limited to described in embodiment is included, it is every by those skilled in the art's technique according to the invention scheme
The other embodiment drawn, also belongs to the scope of protection of the invention.
Claims (2)
1. a kind of high-precision optical fiber gyro light channel structure for having the function of to suppress relative intensity noise, including ASE light sources, detection
Device, coupler, Y waveguide integrated optical device and polarization-maintaining fiber coil, it is characterised in that：It is equipped between ASE light sources and coupler
Semiconductor optical amplifier, ASE light sources be divided into after semiconductor optical amplifier, coupler, Y waveguide integrated optical device two-way into
Enter polarization-maintaining fiber coil, the interference light come out from polarization-maintaining fiber coil is by entering detector after coupler.
2. the high-precision optical fiber gyro light channel structure according to claim 1 for having the function of to suppress relative intensity noise, its
It is characterized in that：The semiconductor optical amplifier selects partly leading for corresponding saturated light power parameter according to ASE source device output optical powers
Body image intensifer, suppresses the relative intensity noise of the output light of ASE light sources.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282805A (en) * | 2018-08-24 | 2019-01-29 | 浙江大学 | The device and method for reducing optical fibre gyro random walk coefficient with active spectral filtering |
| CN109580180A (en) * | 2018-12-10 | 2019-04-05 | 株洲菲斯罗克光电技术有限公司 | A kind of light source relative intensity noise test macro |
| CN110044347A (en) * | 2019-02-25 | 2019-07-23 | 浙江大学 | A kind of novel low noise optical fibre gyro |
| CN111044026A (en) * | 2019-12-30 | 2020-04-21 | 北京航空航天大学 | Relative intensity noise suppression device for high-precision fiber-optic gyroscope |
| CN111780739A (en) * | 2020-06-18 | 2020-10-16 | 湖南航天机电设备与特种材料研究所 | Optical fiber gyroscope and relative intensity noise suppression device and method thereof |
| CN114526719A (en) * | 2022-02-15 | 2022-05-24 | 哈尔滨工业大学 | Entanglement enhanced interference type fiber-optic gyroscope for inhibiting relative intensity noise and control method thereof |
| CN114868343A (en) * | 2020-01-03 | 2022-08-05 | 思科技术公司 | Active relative intensity noise reduction using nested interferometers and transimpedance amplifiers |
| CN115900772A (en) * | 2023-03-09 | 2023-04-04 | 中国船舶集团有限公司第七〇七研究所 | Method and system for improving random walk coefficient of integrated optical gyroscope |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109282805A (en) * | 2018-08-24 | 2019-01-29 | 浙江大学 | The device and method for reducing optical fibre gyro random walk coefficient with active spectral filtering |
| CN109282805B (en) * | 2018-08-24 | 2020-12-18 | 浙江大学 | Device and method for reducing random walk coefficient of fiber-optic gyroscope by active spectral filtering |
| CN109580180A (en) * | 2018-12-10 | 2019-04-05 | 株洲菲斯罗克光电技术有限公司 | A kind of light source relative intensity noise test macro |
| CN110044347A (en) * | 2019-02-25 | 2019-07-23 | 浙江大学 | A kind of novel low noise optical fibre gyro |
| CN110044347B (en) * | 2019-02-25 | 2020-10-20 | 浙江大学 | Novel low-noise optical fiber gyroscope |
| CN111044026A (en) * | 2019-12-30 | 2020-04-21 | 北京航空航天大学 | Relative intensity noise suppression device for high-precision fiber-optic gyroscope |
| CN114868343A (en) * | 2020-01-03 | 2022-08-05 | 思科技术公司 | Active relative intensity noise reduction using nested interferometers and transimpedance amplifiers |
| CN111780739A (en) * | 2020-06-18 | 2020-10-16 | 湖南航天机电设备与特种材料研究所 | Optical fiber gyroscope and relative intensity noise suppression device and method thereof |
| CN114526719A (en) * | 2022-02-15 | 2022-05-24 | 哈尔滨工业大学 | Entanglement enhanced interference type fiber-optic gyroscope for inhibiting relative intensity noise and control method thereof |
| CN115900772A (en) * | 2023-03-09 | 2023-04-04 | 中国船舶集团有限公司第七〇七研究所 | Method and system for improving random walk coefficient of integrated optical gyroscope |
| CN115900772B (en) * | 2023-03-09 | 2023-05-09 | 中国船舶集团有限公司第七〇七研究所 | Method and system for improving random walk coefficient of integrated optical gyroscope |
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