CN106840224A - Fiber Bragg Grating FBG demodulating system and Peak Search Method based on electroabsorption modulator - Google Patents
Fiber Bragg Grating FBG demodulating system and Peak Search Method based on electroabsorption modulator Download PDFInfo
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- CN106840224A CN106840224A CN201710052498.XA CN201710052498A CN106840224A CN 106840224 A CN106840224 A CN 106840224A CN 201710052498 A CN201710052498 A CN 201710052498A CN 106840224 A CN106840224 A CN 106840224A
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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Abstract
The invention discloses a kind of Fiber Bragg Grating FBG demodulating system and Peak Search Method based on electroabsorption modulator, system includes wideband light source, isolator, photo-coupler, photoswitch, bias generator, electroabsorption modulator, data collecting system and host computer, wherein wideband light source, isolator, photo-coupler and photoswitch are sequentially connected, bias generator, electroabsorption modulator, data collecting system and host computer are sequentially connected, photo-coupler is also connected with electroabsorption modulator, host computer is also connected with bias generator and photoswitch respectively, the work of PC control bias generator and photoswitch.Method is：Step one, the light for sending wideband light source enter refer to FBG；Step 2, data signal is converted optical signals to, be transmitted to host computer；Step 3, host computer carry out data processing and calculate the grating wavelength and crest location of sensing passage.Beneficial effect：Demodulation speed is high, low cost, simple structure, easy to operate, and man-machine interaction is good.
Description
Technical field
It is more particularly to a kind of to be based on electric absorption the present invention relates to a kind of Fiber Bragg Grating FBG demodulating system and Peak Search Method
The Fiber Bragg Grating FBG demodulating system and Peak Search Method of modulator.
Background technology
At present, Fiber Bragg Grating FBG (FBG) is that one kind can sense various physical parameters such as strain, temperature, pressure, magnetic field
Optical passive component, with the spy such as small volume, low cost, sensitivity high, waterproof, anti-electric, anti-lightning strike, anticorrosion, highly reliable
Point, application widely is had been obtained in sensory field.Fiber-optic grating sensor belongs to wavelength modulation fiber sensor,
It is the optical grating reflection or the spectral detection of transmission peak wavelength by being write to light inside, is realized to by the strain of geodesic structure and temperature
The absolute measurement of the values such as degree.At present, the method being demodulated to optic fiber grating wavelength mainly has spectrometer detection method, matching light
Grid method, edge filter method, tunable Fabry-Perot filter methods, non-equilibrium M-Z fibre optic interferometers method, Michelson's interferometer
Demodulation method, length scanning optical fiber laser demodulation method etc..
Electroabsorption modulator (electroabsorption modulator) has small volume, compact conformation, high speed, low sad sing, is easily integrated, by force
The advantages of non-linear absorption properties, as one of the Primary Component of modern communication technology, the application field of electroabsorption modulator by
Step expands, and the light source module of stabilization at a high speed can be not only integrated to form with semiconductor laser, in high speed wavelength division multiplexing (WDM) skill
Art and Optical Time Division Multiplexing (OTDM) are also widely used, based on electroabsorption modulator wavelength convert and Clock Extraction, letter
Number regeneration etc. technology also realized.Therefore, the application of electroabsorption modulator and development oneself achieve the achievement that attracts people's attention, and into
It is Modern optical communication technology and the focus of optical-fiber network technical research.
The content of the invention
The one kind provided the invention aims to realize inexpensive, high-precision demodulation is based on electroabsorption modulator
Fiber Bragg Grating FBG demodulating system and Peak Search Method.
The present invention provide the Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator include wideband light source, every
From device, photo-coupler, photoswitch, bias generator, electroabsorption modulator, data collecting system and host computer, wherein broadband light
Source, isolator, photo-coupler and photoswitch are sequentially connected, bias generator, electroabsorption modulator, data collecting system and upper
Machine is sequentially connected, and photo-coupler is also connected with electroabsorption modulator, host computer also respectively with bias generator and photoswitch phase
The work of connection, PC control bias generator and photoswitch.
Photoswitch is connected to one with reference to FBG and sensing FBG, and photoswitch will sense FBG and be accessed with reference to FBG
Circuit.
Photo-coupler is 50 from theoretical splitting ratio:50 photo-coupler.
Bias generator by PC control for electroabsorption modulator provide zero to electroabsorption modulator rated voltage company
Continuous linear voltage, electroabsorption modulator converts optical signals to current signal, and electroabsorption modulator is multiple quantum trap electric absorption
Modulator, the characteristic with low driving voltage and High Extinction Ratio, bias generator is Dc bias generator, the bias width of output
It is 0-100V to be worth.
Data collecting system includes a signaling conversion circuit and a high-precision modulus A/D change-over circuit, data
Current signal is converted to amplification voltage signal by acquisition system, and voltage signal is converted into number by modulus A/D change-over circuits
Word signal, sends host computer to.
Wideband light source, isolator, photo-coupler, photoswitch, bias generator, electroabsorption modulator, data collecting system
With the assembling that host computer is existing equipment, therefore, concrete model and specification are not repeated further.
The Peak Search Method of the demodulation of the Fiber Bragg Grating FBG based on electroabsorption modulator that the present invention is provided, its method is as follows
It is described：
Then step one, the light for sending wideband light source enter first through isolator, photo-coupler under the control of photoswitch
Enter to refer to FBG；
Step 2, the light reflected by reference FBG carry information and enter electroabsorption modulator, electro-absorption modulation through photo-coupler
Device provides continuously linear voltage by bias generator, converts optical signals to current signal, and data collecting system is by current signal
The voltage signal of amplification is converted to, and is converted to data signal, be transmitted to host computer；
Step 3, host computer carry out data processing, by electroabsorption modulator electric current and the absorption light intensity curve of voltage relationship
Mapping storage is done with reference to FBG spectrum, sensing FBG is carried out with FBG is referred to through same process, by the right of side-play amount and wavelength
The grating wavelength and crest location for calculating sensing passage should be related to.
Beneficial effects of the present invention：
A kind of Fiber Bragg Grating FBG demodulating system and Peak Search Method based on electroabsorption modulator that the present invention is provided, solution
Speed governing degree is high, low cost, simple structure, easy to operate, and man-machine interaction is good.Multigroup demodulating data, and query history can be stored
Data.And module expansion can be carried out, while accessing branched Sensor monitoring and being uniformly controlled.
Brief description of the drawings
Fig. 1 is principle schematic diagram. of the invention.
Fig. 2 is optical absorption spectra test result schematic diagram under different bias voltages.
Fig. 3 is absorption light intensity curve and photoelectric current and wavelength curve corresponding relation schematic diagram.
1st, wideband light source 2, isolator 3, photo-coupler 4, photoswitch 5, bias generator
6th, electroabsorption modulator 7, data collecting system 8, host computer 9, with reference to FBG
10th, FBG is sensed.
Specific embodiment
Refer to shown in Fig. 1, Fig. 2 and Fig. 3：
The present invention provide the Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator include wideband light source 1,
Isolator 2, photo-coupler 3, photoswitch 4, bias generator 5, electroabsorption modulator 6, data collecting system 7 and host computer 8, its
Middle width strip light source 1, isolator 2, photo-coupler 3 and photoswitch 4 are sequentially connected, bias generator 5, electroabsorption modulator 6, data
Acquisition system 7 and host computer 8 are sequentially connected, and photo-coupler 3 is also connected with electroabsorption modulator 6, host computer 8 also respectively with partially
Pressure generator 5 is connected with photoswitch 4, the work of the control bias generator 5 of host computer 8 and photoswitch 4.
Photoswitch 4 is connected to one with reference to a FBG 9 and sensing FBG 10, and photoswitch 4 will sense the Hes of FBG 10
Circuit is accessed with reference to FBG 9.
Photo-coupler 3 is 50 from theoretical splitting ratio:50 photo-coupler.
Bias generator 5 is controlled to electroabsorption modulator 6 and provides zero to the rated voltage of electroabsorption modulator 6 by host computer 8
Continuously linear voltage, electroabsorption modulator 6 converts optical signals to current signal, and electroabsorption modulator 6 is multiple quantum trap
Electroabsorption modulator, the characteristic with low driving voltage and High Extinction Ratio, bias generator 5 is Dc bias generator, output
Bias amplitude be 0-100V.
Data collecting system 7 includes a signaling conversion circuit and a high-precision modulus A/D change-over circuit, data
Current signal is converted to amplification voltage signal by acquisition system 7, and voltage signal is converted into number by modulus A/D change-over circuits
Word signal, sends host computer 8 to.
Wideband light source 1, isolator 2, photo-coupler 3, photoswitch 4, bias generator 5, electroabsorption modulator 6, data are adopted
Collecting system 7 and host computer 8 are the assembling of existing equipment, therefore, concrete model and specification are not repeated further.
The Peak Search Method of the demodulation of the Fiber Bragg Grating FBG based on electroabsorption modulator that the present invention is provided, its method is as follows
It is described：
Step one, the light for sending wideband light source 1 are then first under the control of photoswitch 4 through isolator 2, photo-coupler 3
It is introduced into reference to FBG 9；
Step 2, the light reflected by referring to FBG 9 carry information and enter electroabsorption modulator 6, electric absorption through photo-coupler 3
Modulator 6 provides continuously linear voltage by bias generator 5, converts optical signals to current signal, and data collecting system 7 is by electricity
Stream signal is converted to the voltage signal of amplification, and is converted to data signal, is transmitted to host computer 8；
Step 3, host computer 8 carry out data processing, and the absorption light intensity of the electric current of electroabsorption modulator 6 and voltage relationship is bent
Line does mapping storage with reference to the spectrum of FBG 9, and sensing FBG 10 is carried out with reference to FBG 9 through same process, by side-play amount
With the grating wavelength and crest location that the corresponding relation of wavelength calculates sensing passage.
Claims (6)
1. a kind of Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator, it is characterised in that：Include wideband light source,
Isolator, photo-coupler, photoswitch, bias generator, electroabsorption modulator, data collecting system and host computer, its middle width strip
Light source, isolator, photo-coupler and photoswitch are sequentially connected, bias generator, electroabsorption modulator, data collecting system and on
Position machine be sequentially connected, photo-coupler is also connected with electroabsorption modulator, host computer also respectively with bias generator and photoswitch
It is connected, the work of PC control bias generator and photoswitch.
2. the Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator according to claim 1, it is characterised in that：
Described photoswitch is connected to one with reference to FBG and sensing FBG, and photoswitch will sense FBG and access electricity with reference to FBG
Road.
3. the Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator according to claim 1, it is characterised in that：
Described photo-coupler is 50 from theoretical splitting ratio:50 photo-coupler.
4. the Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator according to claim 1, it is characterised in that：
Described bias generator is by PC control for electroabsorption modulator provides zero to the continuous of electroabsorption modulator rated voltage
Linear voltage, electroabsorption modulator converts optical signals to current signal, and electroabsorption modulator is adjusted for multiple quantum trap electric absorption
Device processed, the characteristic with low driving voltage and High Extinction Ratio, bias generator is Dc bias generator, the bias amplitude of output
It is 0-100V.
5. the Fiber Bragg Grating FBG demodulating system based on electroabsorption modulator according to claim 1, it is characterised in that：
Described data collecting system includes a signaling conversion circuit and a high-precision modulus A/D change-over circuit, and data are adopted
Current signal is converted to amplification voltage signal by collecting system, and voltage signal is converted into numeral by modulus A/D change-over circuits
Signal, sends host computer to.
6. the Peak Search Method that a kind of Fiber Bragg Grating FBG based on electroabsorption modulator is demodulated, it is characterised in that：Its method is such as
It is lower described：
Then step one, the light for sending wideband light source initially enter ginseng through isolator, photo-coupler under the control of photoswitch
Examine FBG；
Step 2, information carried by the light reflected with reference to FBG enter electroabsorption modulator through photo-coupler, electroabsorption modulator by
Bias generator provides continuously linear voltage, converts optical signals to current signal, and data collecting system changes current signal
It is the voltage signal for amplifying, and is converted to data signal, is transmitted to host computer；
Step 3, host computer carry out data processing, by the absorption light intensity curve of electroabsorption modulator electric current and voltage relationship and ginseng
Examine FBG spectrum and do mapping storage, sensing FBG is carried out with reference to FBG through same process, closed by the correspondence of side-play amount and wavelength
System calculates the grating wavelength and crest location of sensing passage.
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Cited By (4)
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| CN107560645A (en) * | 2017-08-29 | 2018-01-09 | 北京航空航天大学 | A kind of fiber Bragg grating sensor Wavelength demodulation Peak Search Method |
| CN109768832A (en) * | 2019-01-14 | 2019-05-17 | 中国科学院上海光学精密机械研究所 | Low noise coherent optics and rf frequency standard while demodulating equipment |
| CN110260898A (en) * | 2019-06-24 | 2019-09-20 | 武汉理工光科股份有限公司 | Jamproof grating wavelength demodulation method and system |
| CN112350781A (en) * | 2019-08-06 | 2021-02-09 | 科大国盾量子技术股份有限公司 | Low-voltage-driven high-speed photon quantum state preparation device and method |
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| CN112350781A (en) * | 2019-08-06 | 2021-02-09 | 科大国盾量子技术股份有限公司 | Low-voltage-driven high-speed photon quantum state preparation device and method |
| CN112350781B (en) * | 2019-08-06 | 2022-02-11 | 科大国盾量子技术股份有限公司 | Low-voltage-driven high-speed photon quantum state preparation device and method |
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