CN106840224B - Fiber Bragg grating demodulation system based on electro-absorption modulator and peak searching method - Google Patents
Fiber Bragg grating demodulation system based on electro-absorption modulator and peak searching method Download PDFInfo
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- CN106840224B CN106840224B CN201710052498.XA CN201710052498A CN106840224B CN 106840224 B CN106840224 B CN 106840224B CN 201710052498 A CN201710052498 A CN 201710052498A CN 106840224 B CN106840224 B CN 106840224B
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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
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- 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 fiber Bragg grating demodulation system based on an electro-absorption modulator and a peak searching method, wherein the system comprises a broadband light source, an isolator, an optical coupler, an optical switch, a bias voltage generator, the electro-absorption modulator, a data acquisition system and an upper computer, wherein the broadband light source, the isolator, the optical coupler and the optical switch are sequentially connected, the bias voltage generator, the electro-absorption modulator, the data acquisition system and the upper computer are sequentially connected, the optical coupler is also connected with the electro-absorption modulator, the upper computer is also respectively connected with the bias voltage generator and the optical switch, and the upper computer controls the work of the bias voltage generator and the work of the optical switch. The method comprises the following steps: step one, light emitted by a broadband light source enters a reference FBG; converting the optical signal into a digital signal and transmitting the digital signal to an upper computer; and step three, the upper computer processes data and calculates the grating wavelength and the peak position of the sensing channel. Has the advantages that: the demodulation speed is high, the cost is low, the structure is simple, the operation is convenient, and the human-computer interaction is good.
Description
Technical Field
The invention relates to a fiber Bragg grating demodulation system and a peak searching method, in particular to a fiber Bragg grating demodulation system and a peak searching method based on an electro-absorption modulator.
Background
At present, a Fiber Bragg Grating (FBG) is an optical passive device capable of sensing various physical parameters such as strain, temperature, pressure, magnetic field and the like, has the characteristics of small volume, low cost, high sensitivity, water resistance, electricity resistance, lightning protection, corrosion resistance, strong reliability and the like, and has been widely applied in the sensing field. The optical fiber grating sensor belongs to a wavelength modulation type optical fiber sensor, and realizes absolute measurement of strain, temperature and other values of a measured structure through spectrum detection of grating reflection or transmission wavelength written in light. At present, the methods for demodulating the wavelength of the fiber bragg grating mainly include a spectrometer detection method, a matched grating method, an edge filtering method, a tunable Fabry-Perot filtering method, an unbalanced M-Z fiber interferometer method, a michelson interferometer demodulation method, a wavelength scanning fiber laser demodulation method and the like.
The electro-absorption modulator (electro-absorption modulator) has the advantages of small volume, compact structure, high speed, low sad chirp, easy integration, strong nonlinear absorption characteristic and the like, is one of key devices of modern communication technology, gradually expands the application field of the electro-absorption modulator, can be integrated with a semiconductor laser to form a high-speed stable light source module, is widely applied to high-speed Wavelength Division Multiplexing (WDM) technology and Optical Time Division Multiplexing (OTDM), and is also realized on the basis of electro-absorption modulator wavelength conversion and clock extraction, signal regeneration and other technologies. Therefore, the application and development of the electro-absorption modulator have achieved remarkable results and become hot spots for the research of modern optical communication technology and optical network technology.
Disclosure of Invention
The invention aims to provide a fiber Bragg grating demodulation system and a peak searching method based on an electro-absorption modulator for realizing demodulation with low cost and high precision.
The invention provides an optical fiber Bragg grating demodulation system based on an electro-absorption modulator, which comprises a broadband light source, an isolator, an optical coupler, an optical switch, a bias voltage generator, the electro-absorption modulator, a data acquisition system and an upper computer, wherein the broadband light source, the isolator, the optical coupler and the optical switch are sequentially connected, the bias voltage generator, the electro-absorption modulator, the data acquisition system and the upper computer are sequentially connected, the optical coupler is also connected with the electro-absorption modulator, the upper computer is also respectively connected with the bias voltage generator and the optical switch, and the upper computer controls the work of the bias voltage generator and the optical switch.
The optical switch is respectively connected with a reference FBG and a sensing FBG, and the sensing FBG and the reference FBG are connected into the circuit by the optical switch.
The optical coupler is selected from the optical couplers with the theoretical splitting ratio of 50.
The bias voltage generator is controlled by the upper computer to provide continuous linear voltage from zero to rated voltage of the electro-absorption modulator for the electro-absorption modulator, the electro-absorption modulator converts an optical signal into a current signal, the electro-absorption modulator is a multiple quantum well electro-absorption modulator and has the characteristics of low driving voltage and high extinction ratio, the bias voltage generator is a direct current bias voltage generator, and the output bias voltage amplitude is 0-100V.
The data acquisition system comprises a signal conversion circuit and a high-precision analog-to-digital A/D conversion circuit, converts the current signal into an amplified voltage signal, converts the voltage signal into a digital signal through the analog-to-digital A/D conversion circuit and transmits the digital signal to the upper computer.
The broadband light source, the isolator, the optical coupler, the optical switch, the bias voltage generator, the electric absorption modulator, the data acquisition system and the upper computer are all assembled by existing equipment, and therefore specific models and specifications are not further described.
The invention provides a peak searching method for demodulation of a fiber Bragg grating based on an electro-absorption modulator, which comprises the following steps:
step one, enabling light emitted by a broadband light source to pass through an isolator and an optical coupler, and then entering a reference FBG under the control of an optical switch;
step two, the light reflected by the reference FBG carries information and enters an electro-absorption modulator through an optical coupler, the electro-absorption modulator provides continuous linear voltage through a bias generator, an optical signal is converted into a current signal, a data acquisition system converts the current signal into an amplified voltage signal, the amplified voltage signal is converted into a digital signal, and the digital signal is transmitted to an upper computer;
and step three, the upper computer processes data, mapping and storing an absorption light intensity curve of the relationship between the current and the voltage of the electro-absorption modulator and the spectrum of the reference FBG, carrying out the same process on the sensing FBG and the reference FBG, and calculating the grating wavelength and the peak position of the sensing channel according to the corresponding relationship between the offset and the wavelength.
The invention has the beneficial effects that:
the fiber Bragg grating demodulation system and the peak searching method based on the electro-absorption modulator have the advantages of high demodulation speed, low cost, simple structure, convenience in operation and good man-machine interaction. Multiple sets of demodulated data may be stored and historical data queried. And module expansion can be carried out, and a plurality of sensors are simultaneously accessed for monitoring and unified control.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the present invention.
FIG. 2 is a graph showing the results of optical absorption spectrum tests at different bias voltages.
FIG. 3 is a diagram showing the relationship between the absorption intensity curve and the photocurrent curve and the wavelength curve.
1. Broadband light source 2, isolator 3, optical coupler 4, optical switch 5, bias voltage generator
6. Electro-absorption modulator 7, data acquisition system 8, upper computer 9 and reference FBG
10. The FBG is sensed.
Detailed Description
Please refer to fig. 1, fig. 2 and fig. 3:
the invention provides an electro-absorption modulator-based fiber Bragg grating demodulation system which comprises a broadband light source 1, an isolator 2, an optical coupler 3, an optical switch 4, a bias voltage generator 5, an electro-absorption modulator 6, a data acquisition system 7 and an upper computer 8, wherein the broadband light source 1, the isolator 2, the optical coupler 3 and the optical switch 4 are sequentially connected, the bias voltage generator 5, the electro-absorption modulator 6, the data acquisition system 7 and the upper computer 8 are sequentially connected, the optical coupler 3 is further connected with the electro-absorption modulator 6, the upper computer 8 is further respectively connected with the bias voltage generator 5 and the optical switch 4, and the upper computer 8 controls the bias voltage generator 5 and the optical switch 4 to work.
The optical switch 4 is connected with a reference FBG 9 and a sensing FBG 10 respectively, and the optical switch 4 connects the sensing FBG 10 and the reference FBG 9 into a circuit.
The optical coupler 3 is an optical coupler with a theoretical splitting ratio of 50.
The bias generator 5 is controlled by the upper computer 8 to provide continuous linear voltage from zero to rated voltage of the electro-absorption modulator 6 for the electro-absorption modulator 6, the electro-absorption modulator 6 converts an optical signal into a current signal, the electro-absorption modulator 6 is a multiple quantum well electro-absorption modulator and has the characteristics of low driving voltage and high extinction ratio, the bias generator 5 is a direct current bias generator, and the output bias amplitude is 0-100V.
The data acquisition system 7 comprises a signal conversion circuit and a high-precision analog-to-digital A/D conversion circuit, the data acquisition system 7 converts the current signal into an amplified voltage signal, converts the voltage signal into a digital signal through the analog-to-digital A/D conversion circuit, and transmits the digital signal to the upper computer 8.
The broadband light source 1, the isolator 2, the optical coupler 3, the optical switch 4, the bias generator 5, the electric absorption modulator 6, the data acquisition system 7 and the upper computer 8 are all assembled by existing equipment, and therefore specific models and specifications are not further described.
The invention provides a peak searching method for demodulation of a fiber Bragg grating based on an electro-absorption modulator, which comprises the following steps:
step one, light emitted by a broadband light source 1 passes through an isolator 2 and an optical coupler 3, and then enters a reference FBG 9 under the control of an optical switch 4;
step two, the light reflected by the reference FBG 9 carries information and enters the electro-absorption modulator 6 through the optical coupler 3, the electro-absorption modulator 6 provides continuous linear voltage through the bias voltage generator 5, the light signal is converted into a current signal, the data acquisition system 7 converts the current signal into an amplified voltage signal, the amplified voltage signal is converted into a digital signal, and the digital signal is transmitted to the upper computer 8;
and step three, the upper computer 8 performs data processing, maps and stores an absorption light intensity curve of the current-voltage relation of the electro-absorption modulator 6 and the spectrum of the reference FBG 9, performs the sensing FBG 10 and the reference FBG 9 in the same process, and calculates the grating wavelength and the peak position of the sensing channel according to the corresponding relation of the offset and the wavelength.
Claims (4)
1. The utility model provides a fiber Bragg grating demodulation system based on electroabsorption modulator, including broadband light source, the isolator, the optical coupler, photoswitch, the bias voltage generator, the electroabsorption modulator, data acquisition system and host computer, wherein broadband light source, the isolator, optical coupler and photoswitch link to each other in proper order, the bias voltage generator, the electroabsorption modulator, data acquisition system and host computer link to each other in proper order, the optical coupler still is connected with the electroabsorption modulator, the host computer still is connected with bias voltage generator and photoswitch respectively, the work of host computer control bias voltage generator and photoswitch, its characterized in that: the optical switch is respectively connected with a reference FBG and a sensing FBG, and the sensing FBG and the reference FBG are connected into the circuit by the optical switch; the bias voltage generator is controlled by the upper computer to provide continuous linear voltage from zero to rated voltage of the electro-absorption modulator for the electro-absorption modulator, the electro-absorption modulator converts an optical signal into a current signal, the electro-absorption modulator is a multiple quantum well electro-absorption modulator and has the characteristics of low driving voltage and high extinction ratio, the bias voltage generator is a direct current bias voltage generator, and the output bias voltage amplitude is 0-100V.
2. The electro-absorption modulator based fiber bragg grating demodulation system of claim 1, wherein: the optical coupler is an optical coupler with a theoretical splitting ratio of 50.
3. The electro-absorption modulator based fiber bragg grating demodulation system of claim 1, wherein: the data acquisition system comprises a signal conversion circuit and a high-precision analog-to-digital A/D conversion circuit, converts the current signal into an amplified voltage signal, converts the voltage signal into a digital signal through the analog-to-digital A/D conversion circuit and transmits the digital signal to the upper computer.
4. A fiber bragg grating demodulation peak finding method using the fiber bragg grating demodulation system based on the electro-absorption modulator according to claim 1, wherein: the method comprises the following steps:
step one, enabling light emitted by a broadband light source to pass through an isolator and an optical coupler and then enter a reference FBG (fiber Bragg Grating) under the control of an optical switch;
step two, the light reflected by the reference FBG carries information and enters an electro-absorption modulator through an optical coupler, the electro-absorption modulator provides continuous linear voltage through a bias generator, an optical signal is converted into a current signal, a data acquisition system converts the current signal into an amplified voltage signal, the amplified voltage signal is converted into a digital signal, and the digital signal is transmitted to an upper computer;
and step three, the upper computer processes data, mapping and storing an absorption light intensity curve of the relationship between the current and the voltage of the electro-absorption modulator and the spectrum of the reference FBG, carrying out the same process on the sensing FBG and the reference FBG, and calculating the grating wavelength and the peak position of the sensing channel according to the corresponding relationship between the offset and the wavelength.
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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 |
| CN109768832B (en) * | 2019-01-14 | 2021-10-08 | 中国科学院上海光学精密机械研究所 | Low-noise coherent optical and radio frequency standard simultaneous demodulation device |
| CN110260898B (en) * | 2019-06-24 | 2021-07-06 | 武汉理工光科股份有限公司 | Anti-interference grating wavelength demodulation method and system |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2285708A1 (en) * | 1999-10-08 | 2001-04-08 | David J.F. Cooper | Method and device for time domain demultiplexing of serial fiber bragg grating sensor arrays |
| CN102147552A (en) * | 2011-03-11 | 2011-08-10 | 大连理工大学 | Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method |
| CN102226703A (en) * | 2011-03-29 | 2011-10-26 | 宁波诺驰光电科技发展有限公司 | Distributed fiber multi-parameter sensor and multi-parameter measuring method |
| CN103019286A (en) * | 2012-12-18 | 2013-04-03 | 中国计量学院 | Device and method for controlling bias voltage of electrooptical modulator |
| CN103994785A (en) * | 2014-05-29 | 2014-08-20 | 武汉理工大学 | Sensing monitoring device and method based on weak fiber bragg grating array |
| CN204761443U (en) * | 2015-07-24 | 2015-11-11 | 武汉光迅科技股份有限公司 | In -band passes optical module of supervisory signal thoroughly based on frequency modulation |
-
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- 2017-01-24 CN CN201710052498.XA patent/CN106840224B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2285708A1 (en) * | 1999-10-08 | 2001-04-08 | David J.F. Cooper | Method and device for time domain demultiplexing of serial fiber bragg grating sensor arrays |
| CN102147552A (en) * | 2011-03-11 | 2011-08-10 | 大连理工大学 | Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method |
| CN102226703A (en) * | 2011-03-29 | 2011-10-26 | 宁波诺驰光电科技发展有限公司 | Distributed fiber multi-parameter sensor and multi-parameter measuring method |
| CN103019286A (en) * | 2012-12-18 | 2013-04-03 | 中国计量学院 | Device and method for controlling bias voltage of electrooptical modulator |
| CN103994785A (en) * | 2014-05-29 | 2014-08-20 | 武汉理工大学 | Sensing monitoring device and method based on weak fiber bragg grating array |
| CN204761443U (en) * | 2015-07-24 | 2015-11-11 | 武汉光迅科技股份有限公司 | In -band passes optical module of supervisory signal thoroughly based on frequency modulation |
Non-Patent Citations (1)
| Title |
|---|
| 基于电吸收调制器的非相干可调谐微波光子滤波器;魏志虎 等;《光电子·激光》;20130630;第24卷(第6期);第1086-1089页 * |
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