CN110030987A - A kind of high-power Gaussian spectrum ASE light source of fibre optic gyroscope - Google Patents
A kind of high-power Gaussian spectrum ASE light source of fibre optic gyroscope Download PDFInfo
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- CN110030987A CN110030987A CN201910215067.XA CN201910215067A CN110030987A CN 110030987 A CN110030987 A CN 110030987A CN 201910215067 A CN201910215067 A CN 201910215067A CN 110030987 A CN110030987 A CN 110030987A
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- light source
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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
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- Optics & Photonics (AREA)
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- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
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Abstract
The present invention relates to a kind of high-power Gaussian spectrum ASE light sources of fibre optic gyroscope, and technical characteristics are: light source driving circuit includes constant current source driving circuit, power control circuit and temperature-control circuit；Light source optical path includes pump laser, wavelength division multiplexer, Er-doped fiber, reflecting mirror, isolator and filter, the pump laser is connected with wavelength division multiplexer, the wavelength division multiplexer, Er-doped fiber, reflecting mirror, which are sequentially connected, to be connect, which also passes through isolator, filter is connected with optical fibre gyro；Constant current source driving circuit is connected with the thermistor in pump laser, and power control circuit and temperature-control circuit are connected with pump laser.The present invention has rational design, improves the temperature stability of light source power, ensure that laser light power and wavelength stability, reduces the volume and weight of gyro, reduces manufacturing cost, is applied to miniaturization optical fiber gyro instrument, can meet system requirement.
Description
Technical field
The invention belongs to fibre optic gyroscope technical field, the high-power Gaussian spectrum ASE light of especially a kind of fibre optic gyroscope
Source.
Background technique
The development of optical fibre gyro is built upon on the basis of the new and high technologies such as contemporary optic communication and optoelectronic intagration.Due to it
Common concern in the importance of Aeronautics and Astronautics, navigation and weapons field, by the countries in the world especially military.Currently, domestic
The commercialization of infrared optical fiber gyro is widely used in many fields.These application fields include: satellite gravity anomaly and determine
To；The inertial navigation on naval vessel, guided missile and military, civilian aircraft；Various carrier rocket applications；Tactical weapon guidance system；It leads on land
Boat and positioning and orientation system；It is attitude heading reference system and automobile navigation instrument, oil drilling orientation, optics compass, various
The industry such as control device of limit operation and civil field.
Light source is the critical component of optical fibre gyro, and the performance superiority and inferiority of optical fibre gyro is inseparable with the performance of light source.
With the promotion of inertial navigation system miniature requirement, miniaturization optical fiber gyro is also had higher requirement.The low precision in
Application field, it is even more small that optical fiber loop size from original Φ 120, Φ 98 has been gradually decreased to Φ 75, Φ 60, therefore,
How to accomplish higher precision just at optical fibre gyro urgent problem to be solved under smaller ring size.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose that a kind of design is reasonable, small in size and with high accuracy
The high-power Gaussian spectrum ASE light source of fibre optic gyroscope.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of fibre optic gyroscope high-power Gaussian spectrum ASE light source, including light source driving circuit and light source optical path, the light
Source driving circuit includes constant current source driving circuit, power control circuit and temperature-control circuit；The light source optical path includes pumping
Laser, wavelength division multiplexer, Er-doped fiber, reflecting mirror, isolator and filter, the pump laser are connected with wavelength division multiplexer
It connects, the wavelength division multiplexer, Er-doped fiber, reflecting mirror, which are sequentially connected, to be connect, which also passes through isolator, filter and light
Fine gyro is connected；The constant current source driving circuit is connected with the thermistor in pump laser, the power control electricity
Road and temperature-control circuit are connected optical path feedback signal and temperature feedback for acquiring pump laser with pump laser
Signal simultaneously carries out drive control to pump laser.
The power control circuit include PD detector, amplification translation circuit and driving output circuit, the PD detector with
Light source optical path, which is connected, acquires optical path feedback signal, which is added to be sent to and put with control setting value
Big varying circuit is simultaneously controlled it by driving output circuit to be output to pump laser.
The temperature-control circuit includes thermistor, amplification translation circuit, driving output circuit, and thermistor is to pumping
Laser carries out temperature sampling and obtains temperature error signal, which is added with control setting value and is sent to amplification change
Change circuit and the Plter refrigerator by driving output circuit to be output to pump laser surface controls it.
The wavelength that the pump laser issues is 980nm；The Er-doped fiber generation wavelength is the spontaneous spoke of 1550nm
Light is penetrated, the wavelength of the wavelength division multiplexer output is 1550nm.
The filter selects Gaussian type filter.
Sagnac rotation phase shift is converted into electric signal and handled for subsequent modulation-demodulation circuit by the detector, should
The resistance value of the transimpedance of detector carries out Dynamic Graph adjustment with corresponding optical power to meet Δ V~0.1V.
The advantages and positive effects of the present invention are:
1, light source driving circuit of the invention uses optical power feedback control loop and temperature control loop, improves light
The temperature stability of source power ensure that laser light power and wavelength stability；Cooperate corresponding light path devices simultaneously
The signal-to-noise ratio that optical fibre gyro output can be improved with technology further decreases the volume and weight of gyro, reduces manufacturing cost, will
It is applied to miniaturization optical fiber gyro instrument, can meet system requirement.
2, filter of the invention selects Gaussian filters solutions: using the scheme of bandpass filtering, original spectrum passes through
After bandpass filtering, main peak can be retained, secondary peak is filtered off, to form the spectrum of class Gaussian, light source can be obviously improved
Mean wavelength stability.
Detailed description of the invention
Fig. 1 is relative intensity noise, shot noise, thermal noise and total random walk coefficient and arrival detector optical power
Relational graph；
Fig. 2 is the relational graph of random walk coefficient and offset phase；
Fig. 3 is the relational graph of random walk coefficient and offset phase under the conditions of two kinds.
Fig. 4 is the schematic diagram of filtering mode in Er-Doped superfluorescent fiber source；
Fig. 5 is whole schematic diagram of the invention；
Fig. 6 is the schematic diagram of light source driving circuit of the invention；
Fig. 7 is light source optical path structural schematic diagram of the invention；
Fig. 8 is to improve circuit drives ability using AD8591 parallel connection.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing.
Mentality of designing of the invention are as follows:
High-power ASE light source and optical path matching technique relate generally to high-power high wavelength stability light source production and gyro letter
It makes an uproar than promoting two aspects.
Influence of the promotion of optical power to optical fibre gyro noise, and the performance of accurate evaluation gyro are analyzed, is needed to optical fiber
Gyro establishes corresponding random noise model, by analyzing the statistical property of gyro, obtains the coefficient for characterizing different noise characteristics.
The model of optical fibre gyro random walk coefficient is built upon on the basis of gyro physical model and statistical model.It first has to determine object
Manage the noise source that gain profiles and links in model introduce.For the closed-loop optical fiber using the demodulation of intrinsic square-wave frequency modulation
Gyro, the output noise of angular speed are usually characterized by random walk coefficient, and the definition of random walk coefficient is produced by white noise
The raw gyroscope output error coefficient accumulated at any time, the expression formula of random walk coefficient are as follows:
In conjunction with the design parameter of certain type gyro, simulation result is as shown in Figure 1.
After establishing the model of random walk coefficient, the parameter optimization by variable is needed, chooses suitable biasing phase
Position, the value and input optical power of transimpedance meet the requirements noise level.The optical power for choosing light source is respectively 10mW,
30mW, 60mW and 100mW, for fixed optical fiber loop, the loss of entire optical path is about 23dB, at this time corresponding arrival detection
The optical power of device is respectively 50,150,200 and 500 μ W, as shown in Figure 2.Draw under different optical powers random walk coefficient and partially
Set phase (modulation depth) φbRelation curve it can be seen that 1) when the timing of optical power one, random walk coefficient is deep with modulation
The intensification of degree and reduce, it to be more than the value that there are one and the corresponding best modulation depth of biasing optical power, and random walk coefficient is again
It can become larger rapidly；2) for biggish optical power, best modulation depth is also further decreased closer to π, random walk coefficient.?
When modulation depth is less than 2.8rad, it is very limited to the promotion of random walk coefficient only to improve optical power；3) another aspect, by
In there are ambient noise, noise can increase sharply when modulation depth is close to π, while modulation depth is too deep also will affect the dynamic of gyro
State property energy, therefore only may also be not enough to reach expected precision target by improving optical power and applying ovennodulation.
In actual engineer application, it is also contemplated that the transimpedance matching problem of detector, the i.e. upper direct current of detector
The level amount of raising Δ V=RfηDI0(1+cosφb)/2.In optical fibre gyro, Δ V is generally set to 0.1V.The value is excessively high
Words can cause detector thermal noise to become larger；When the value is too small, ambient noise starts to show.Still above-mentioned four kinds of optical power water is chosen
It is flat, random walk coefficient is drawn out in RfConstant and RfIt is main when meeting Δ V=0.1V and the relationship (as shown in Figure 3) of offset phase
Investigate influence of the detector transimpedance matching to fiber optic gyroscope performance.It can be seen that 1) one timing of optical power, is taking across resistance
After anti-matching technique, compare RfIt can continue to reduce random walk coefficient when constant；2) after taking transimpedance matching technique, optical power
The potentiality that bigger noise reduces are bigger.In addition, guaranteeing Δ V=0.1V and I0One timing, by Δ V=RfηDI0(1+cosφb)/2
It is found that the transimpedance R of detectorfIt can become larger with the intensification of modulation depth.Therefore, it when choosing suitable modulation depth, mentions
High optical power can more highlight the advantage of transimpedance matching technique.
It can be seen that in for the optical fibre gyro of low precision, promoted light source optical power can be effectively reduced with
Machine migration coefficient.
For ASE light source, optical power and average wavelength stability are promoted using the structure of double-pass backward.Light is being determined
After the overall structure in source, it is also necessary to be designed to the filter in optical path, through filtered spectrum, mean wavelength stability
It can greatly promote.The principle of filtering is the design spectral line opposite with Er-Doped superfluorescent fiber source original spectrum gain, whole to spectrum with this
Spectral pattern required for being obtained after shape.The mode of filtering is generally divided into two kinds according to the difference of spectral pattern after filtering, first is that rectangle is (flat
It is smooth) filtering, another kind is (bell) filtering of Gauss, as shown in Figure 4.Wherein Gaussian filtering is divided into band according to the mode of filtering again
Pass filter and parameter design filtering.
Based on above-mentioned design philosophy, the high-power Gaussian spectrum ASE light source of fibre optic gyroscope of the present invention, as shown in figure 5, including
Light source driving circuit and light source optical path, the light source driving circuit include constant current source driving circuit, power control circuit and temperature
Control circuit.The light source optical path includes pump laser, wavelength division multiplexer, Er-doped fiber, reflecting mirror, isolator, filter.
The constant current source driving circuit is connected with the thermistor in pump laser, the power control circuit and temperature control electricity
Road is connected with pump laser acquires the optical path feedback signal and temperature feedback signal and to pump laser of pump laser
Carry out drive control.This light source driving circuit uses optical power feedback control loop and temperature control loop, improves light source
The temperature stability of power ensure that laser light power and wavelength stability.
As shown in fig. 6, the power control circuit includes PD detector, amplification translation circuit, driving output circuit, PD is visited
Survey device is connected with light source optical path acquires optical path feedback signal, and output bias signal is added with control setting value and is sent to amplification
Varying circuit is simultaneously controlled it by driving output circuit to be output to pump laser.The temperature-control circuit includes heat
Quick resistance, amplification translation circuit, driving output circuit, thermistor carry out temperature sampling to pump laser and obtain temperature deviation
Signal, the temperature error signal are added with control setting value and are sent to amplification varying circuit and by driving output circuit to be output to
The Plter refrigerator on pump laser surface controls it.
In the present embodiment, light source optical path uses the structure of double-pass backward, as shown in Figure 5 and 7.It is big in order to meet light source
The demand of power output, the light source optical path are needed to select corresponding high performance pump laser, wavelength division multiplexer (WDM), be mixed
The devices such as erbium optical fiber, reflecting mirror, isolator and filter build optical path.The pump laser is connected with wavelength division multiplexer,
The wavelength division multiplexer, Er-doped fiber, reflecting mirror, which are sequentially connected, to be connect, which also passes through isolator, filter and optical fiber
Gyro is connected.The wavelength issued from pump laser is the high-intensitive pump light of 980nm, is coupled into increasing through wavelength division multiplexer
In beneficial medium Er-doped fiber.Er-doped fiber generation wavelength through pumping is the spontaneous emission light (ASE) of 1550nm, and along two sides
To propagation, the light of forward direction reflects the 1550nm output end together with backward light through wavelength division multiplexer through reflecting mirror and imports isolator,
It is exported after then passing through filter filtering shaping.
In the present embodiment, filter selects Gaussian filters solutions: using the scheme of bandpass filtering, original spectrum warp
After crossing bandpass filtering, main peak can be retained, secondary peak is filtered off, to form the spectrum of class Gaussian.Due to the light finally obtained
It is relatively narrow to compose spectrum width, so the mean wavelength stability of light source can be obviously improved.
In the present embodiment, Sagnac can be rotated phase shift and is converted by end of the detector as entire light source optical path
Electric signal is handled for subsequent modulation-demodulation circuit.Therefore, it is necessary to transimpedance matched designs, consider Δ V=RfηDI0(1+
cosφb)/2, in the case where the modulation depth of gyro is constant, the resistance value of detector transimpedance need with corresponding optical power into
Mobile state figure adjusts to meet Δ V~0.1V.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore packet of the present invention
Include and be not limited to embodiment described in specific embodiment, it is all by those skilled in the art according to the technique and scheme of the present invention
The other embodiments obtained, also belong to the scope of protection of the invention.
Claims (6)
1. a kind of fibre optic gyroscope is existed with high-power Gaussian spectrum ASE light source, including light source driving circuit and light source optical path, feature
In: the light source driving circuit includes constant current source driving circuit, power control circuit and temperature-control circuit；The light source optical path
Including pump laser, wavelength division multiplexer, Er-doped fiber, reflecting mirror, isolator and filter, the pump laser and wavelength-division are multiple
It is connected with device, the wavelength division multiplexer, Er-doped fiber, reflecting mirror, which are sequentially connected, to be connect, which also passes through isolator, filter
Wave device is connected with optical fibre gyro；The constant current source driving circuit is connected with the thermistor in pump laser, the function
Rate control circuit and temperature-control circuit be connected with pump laser optical path feedback signal for acquiring pump laser and
Temperature feedback signal simultaneously carries out drive control to pump laser.
2. a kind of high-power Gaussian spectrum ASE light source of fibre optic gyroscope according to claim 1, it is characterised in that: described
Power control circuit includes that PD detector, amplification translation circuit and driving output circuit, the PD detector are connected with light source optical path
Acquisition optical path feedback signal is connect, which is added with control setting value and is sent to amplification varying circuit simultaneously
It is controlled it by driving output circuit to be output to pump laser.
3. a kind of high-power Gaussian spectrum ASE light source of fibre optic gyroscope according to claim 1, it is characterised in that: described
Temperature-control circuit includes thermistor, amplification translation circuit, driving output circuit, and thermistor carries out temperature to pump laser
Degree sampling obtains temperature error signal, which is added with control setting value is sent to amplification varying circuit and passes through
The Plter refrigerator that driving output circuit is output to pump laser surface controls it.
4. a kind of fibre optic gyroscope according to any one of claims 1 to 3 high-power Gaussian spectrum ASE light source, feature
Be: the wavelength that the pump laser issues is 980nm；The Er-doped fiber generation wavelength is the spontaneous radiation of 1550nm
The wavelength of light, the wavelength division multiplexer output is 1550nm.
5. a kind of fibre optic gyroscope according to any one of claims 1 to 3 high-power Gaussian spectrum ASE light source, feature
Be: the filter selects Gaussian type filter.
6. a kind of fibre optic gyroscope according to any one of claims 1 to 3 high-power Gaussian spectrum ASE light source, feature
Be: Sagnac rotation phase shift is converted into electric signal and handled for subsequent modulation-demodulation circuit by the detector, the spy
It surveys the resistance value of the transimpedance of device and corresponding optical power carries out Dynamic Graph adjustment to meet Δ V~0.1V.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970792A (en) * | 2019-11-20 | 2020-04-07 | 中国船舶重工集团公司第七0七研究所 | High-stability ASE light source for high-precision fiber-optic gyroscope |
| CN112556680A (en) * | 2020-11-24 | 2021-03-26 | 之江实验室 | ASE light source for three-axis optical fiber gyroscope |
| CN112710296A (en) * | 2020-12-15 | 2021-04-27 | 株洲菲斯罗克光电技术有限公司 | Method and system for improving stability of output wavelength of laser by optical fiber gyroscope |
| CN113865574A (en) * | 2021-09-28 | 2021-12-31 | 中国船舶重工集团公司第七0七研究所 | System for improving scale factor linearity of fiber-optic gyroscope |
| CN114552373A (en) * | 2022-02-23 | 2022-05-27 | 腾景科技股份有限公司 | DFB seed source circuit design method with stable wavelength and stable power |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970792A (en) * | 2019-11-20 | 2020-04-07 | 中国船舶重工集团公司第七0七研究所 | High-stability ASE light source for high-precision fiber-optic gyroscope |
| CN112556680A (en) * | 2020-11-24 | 2021-03-26 | 之江实验室 | ASE light source for three-axis optical fiber gyroscope |
| CN112556680B (en) * | 2020-11-24 | 2022-08-26 | 之江实验室 | ASE light source for three-axis optical fiber gyroscope |
| CN112710296A (en) * | 2020-12-15 | 2021-04-27 | 株洲菲斯罗克光电技术有限公司 | Method and system for improving stability of output wavelength of laser by optical fiber gyroscope |
| CN113865574A (en) * | 2021-09-28 | 2021-12-31 | 中国船舶重工集团公司第七0七研究所 | System for improving scale factor linearity of fiber-optic gyroscope |
| CN114552373A (en) * | 2022-02-23 | 2022-05-27 | 腾景科技股份有限公司 | DFB seed source circuit design method with stable wavelength and stable power |
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Application publication date: 20190719 |