CN105300419A - Fiber grating demodulation apparatus based on semiconductor laser - Google Patents
Fiber grating demodulation apparatus based on semiconductor laser Download PDFInfo
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- CN105300419A CN105300419A CN201510883216.1A CN201510883216A CN105300419A CN 105300419 A CN105300419 A CN 105300419A CN 201510883216 A CN201510883216 A CN 201510883216A CN 105300419 A CN105300419 A CN 105300419A
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Abstract
The invention provides a fiber grating demodulation apparatus based on a semiconductor laser. The fiber grating demodulation apparatus comprises a semiconductor laser, an optical wavelength division multiplexer, an optical circulator, a photoelectric detector, a digital-to-analog conversion unit, a processor, a temperature controller, a wavelength controller and a pulse controller, wherein the digital-to-analog conversion unit receives a feedback current signal output from the photoelectric detector; the processor receives a feedback voltage signal output from the digital-to-analog conversion unit; the processor outputs a corresponding central wavelength signal according to the feedback voltage signal; the temperature controller receives a temperature control signal output from the processor; the wavelength controller receives a wavelength control signal output from the processor; and the pulse controller receives a pulse control signal output from the processor. The fiber grating demodulation apparatus based on a semiconductor laser can realize frequency sweep and pulse output, and can realize accurate, stable and quick detection of the central wavelength of the fiber grating, and especially multi-channel, long-distance and densely distributed fiber gratings, and also has the advantages of being simple in structure, being low in power dissipation, and being low in cost.
Description
Technical field
The invention belongs to photoelectric detection technology field, particularly relate to a kind of fiber grating demodulation device of based semiconductor laser instrument.
Background technology
Fiber grating sensing technology has been widely used in the numerous areas such as industrial safety, defence and military, infrastructure and engineering construction, main monitoring of environmental temperature, fire, the ess-strain of structural member, displacement or acceleration etc.Compared with traditional electrical subclass sensor, optical fiber grating sensing has that antijamming capability is strong, Long-Time Service is reliable and stable, range is large, measuring accuracy advantages of higher; Fiber grating manufacture craft is ripe simultaneously, cost of manufacture is cheap, encapsulation technology is ripe, and this technology is just widely applied from being born.
Simultaneously along with the expansion of application, optical fiber grating sensing is progressively detected gradually to the quasi-distributed even full distributed development of multiple spot by point type, and this just proposes new requirement to multiplex technique.At present, optical fiber optical grating multiplexing technology mainly divides the types such as wavelength-division multiplex (WDM), Time Division Multiplexing, frequency division multiplexing (FDM).WDM technology is owing to being subject to the restriction of light source bandwidth, and the multiplexing number of single channel is fewer, is generally 20 to four ten.Although FDM technology improves reusability, be subject to the restriction of optical path difference, in actual use, single pass multiplexing number is still limited, also cannot realize long distance, distributed measurement simultaneously.
From fiber grating demodulation method, current mainly contain several as follows: one be with wideband light source as light source, with the spectrometer demodulation wavelength that diffraction grating and detector array form, the problem of this method is, extended channel can only additional photoswitch, system cost is higher, also can only do timesharing simultaneously and detect.One is as light source with wideband light source, tunable optic filter is as detection device, the problem of this method is, the spectral concentration of wideband light source is lower, light splitting port number is limited, simultaneously the wavelength output relation do not fixed of tunable optic filter, needs to increase normal pitch in systems in which and calibrates, system complexity increases, cost increases, demodulating algorithm is complicated.Another is that semiconductor laser is as pumping, EDFA or SOA is as gain substance with tunable optic filter as frequency-selecting device, make annular cavity laser, although this method increases spectral concentration, can light splitting is to tens passages, but still normal pitch is needed to calibrate.
Summary of the invention
The object of this invention is to provide and a kind ofly realize pulse frequency sweep and there is the fiber grating demodulation device of the simple based semiconductor laser instrument of structure.
In order to realize object of the present invention, the invention provides a kind of fiber grating demodulation device of based semiconductor laser instrument, fiber grating demodulation device is disposed with semiconductor laser along optical path direction, light wavelength division multiplexing, optical circulator and photodetector, semiconductor laser exports pulsed laser signal to light wavelength division multiplexing, light wavelength division multiplexing exports the pulsed laser signal after wavelength-division multiplex to optical circulator, optical circulator is to photodetector output feedback signal, wherein, fiber grating demodulation device also comprises D/A conversion unit, processor, temperature controller, wavelength control unit and impulse controller, operational amplifier, receive the fed-back current signals of photodetector output and amplify, processor receives the feedback voltage signal that D/A conversion unit exports, processor calculates the centre wavelength signal of each fiber grating of each passage according to feedback voltage signal, the temperature control signals that temperature controller receiving processor exports, temperature controller is electrically connected with semiconductor laser and controls semiconductor laser and works under preset temperature, the wavelength control signal that wavelength control unit receiving processor exports, wavelength control unit is electrically connected with semiconductor laser and controls the pulsed laser signal that semiconductor laser exports preset wavelength, the pulse control signal that impulse controller receiving processor exports, impulse controller is electrically connected also gating pulse controller and exports the impulse light signal of predetermined pulse quantity with semiconductor laser.
Further scheme is, wavelength control signal comprises multiple wavelength signals, wavelength control unit is the wavelength switching signal that exports of receiving processor also, and wavelength control unit controls semiconductor laser and exports the pulsed laser signal of another preset wavelength according to another wavelength signals.
From such scheme, by processor to temperature controller, wavelength control unit and impulse controller control, then semiconductor laser is made to export different wave length, the pulsed laser signal of varying number, utilize wavelength division multiplexer subsequently, optical circulator and photodetector and digital-to-analog conversion, can realize fiber bragg grating center wavelength, especially hyperchannel, long distance, the fiber grating of dense distribution carries out accurately, stable, detect fast, the various occasions of fiber-optic grating sensor application can be applied to, adopt pulse laser output form, detectable long distance, quasi-distributed, multichannel fiber grating, fiber grating demodulation device is made to realize frequency sweep, it is simple that pulse output and fiber grating demodulation device have structure, the features such as the low in energy consumption and cost consumed is low.And then realize frequency sweep, pulse output by the pulse laser exporting multi-wavelength.
Further scheme is, fiber grating demodulation device also comprises the operational amplifier be arranged between photodetector and D/A conversion unit, and operational amplifier is used for changing fed-back current signals into voltage signal and being amplified by described voltage.
Further scheme is, the amplifier control signal that operational amplifier receiving processor exports, and operational amplifier amplifies voltage signal according to amplifier control signal.
Therefore can realize small signal gain multiple by operational amplifier large, strong signal gain multiple is little, makes the dynamic range of this demodulating equipment larger.
Further scheme is, fiber grating demodulation device also comprises display unit, display unit receiving processor output display signal.
Further scheme is, fiber grating demodulation device also comprises interface unit, and processor is received by interface unit or sends interactive signal.
Further scheme is, fiber grating demodulation device also comprises input block, and processor receives input control signal by interface unit.
Therefore convenient for users to use by arranging of display unit, interface unit and input block, the operation also effectively improving fiber grating demodulation device controls convenience.
Accompanying drawing explanation
Fig. 1 is the system chart of fiber grating demodulation device embodiment of the present invention.
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
With reference to the system chart that Fig. 1, Fig. 1 are a kind of fiber grating demodulation devices of based semiconductor laser instrument.Fiber grating demodulation device comprises semiconductor laser 11, light wavelength division multiplexing 12, optical circulator 13, photodetector 14, operational amplifier 15, D/A conversion unit 16, processor 21, temperature controller 22, wavelength control unit 23, impulse controller 24, display unit 25, interface unit 26 and input block 27.
Semiconductor laser 11, light wavelength division multiplexing 12, optical circulator 13 and photodetector 14 set gradually along optical path direction, processor 21 can adopt FPGA signal processor, the Temperature Controlling Chip that temperature controller 22 is MAX8521 primarily of model is formed, the driving chip that wavelength control unit is MAX3737 primarily of model is formed, impulse controller is the driving chip forming circuit of MX3737 primarily of model, and semiconductor laser 11 is the semiconductor laser of SG-DBR structure.
The temperature control signals that temperature controller 22 receiving processor 21 exports, temperature controller 22 is connected with semiconductor laser 11, under temperature controller 22 is operated in preset temperature according to temperature control signals control semiconductor laser 11, the preset temperature of work carries out parameter adjustment by processor 21.
The wavelength control signal that wavelength control unit 23 receiving processor 21 exports and wavelength switching signal, wavelength control signal comprises multiple wavelength signals, the i.e. control signal of multiple different wave length, wavelength control unit 23 is electrically connected with semiconductor laser 11, wavelength control unit 23 controls according to different wavelength signals noise spectra of semiconductor lasers 11, makes semiconductor laser 11 export the pulsed laser signal of different preset wavelengths.
The pulse control signal that impulse controller 24 receiving processor 21 exports and impulsive switched signal, pulse control signal comprises multiple pulse signal, the i.e. control signal of multiple different pulse number amount, impulse controller 24 is electrically connected with semiconductor laser 11, impulse controller 24 controls according to different pulse signal noise spectra of semiconductor lasers 11, make semiconductor laser 11 export the pulsed laser signal of different predetermined pulse quantity, and pulsed laser signal is bandwidth laser.
By processor 21 pairs of temperature controllers 22, the control of wavelength control unit 23 and impulse controller 24, the output area of the output wavelength of semiconductor laser 11 is made to be CBand or LBand, output linewidth 1MHz to 2MHz, output power is not less than 10dBm, side mode suppression ratio is not less than 40dB, scanning stepping 1GHz, pulsewidth 10ns, repetition frequency 100kHz, semiconductor laser 11 is made to realize frequency sweep, pulse exports, namely after exporting the first wave length pulse signal of predetermined pulse quantity, switch the pulse signal of another wavelength exporting predetermined pulse quantity, after completing one-period laser wavelength scan in such a way, get back to preliminary sweep wavelength, carry out next cycle, so move in circles, the laser pulse obtaining continuous wavelength scanning exports.
Semiconductor laser 11 exports pulsed laser signal to light wavelength division multiplexing 12, pulsed laser signal after wavelength-division multiplex outputs in optical circulator 13 by pulsed laser signal after light wavelength division multiplexing 12 is divided into multiple channel by wavelength coverage, output to outer through optical circulator 13 and enter in the fiber-optic grating sensor of sensor fibre, the feedback signal that fiber-optic grating sensor reflects enters highly sensitive photodetector 14 through optical circulator 13, and photodetector 14 changes feedback signal into current signal and exports this fed-back current signals to operational amplifier 15.The voltage signal that fed-back current signals amplifies after process through high speed operation amplifier 15 exports D/A conversion unit 16 to, operational amplifier 15 receives the amplifier control signal exported by processor 21, operational amplifier 15 carries out signal amplification according to this amplifier control signal and calculation process is converted to digital feedback voltage signal, digital feedback voltage signal is exported to processor 21 and carries out computational analysis by D/A conversion unit 16, obtains the centre wavelength of each fiber grating of each passage.
Display unit 25 receiving processor 21 output display signal, display unit 25 can the various job information such as video-stream processor 21 centre wavelength, current operating temperature, operation wavelength or number of pulses of calculating.Input block 27 can be the input class instruments such as physical button, keyboard or mouse, processor 21 receives input control signal by input block 27, interface unit 26 can be wire communication circuit or wireless communication line, processor 21 received by wired or wireless mode or transmit control signal, interactive signal, data-signal etc., then realize can carry out Long-distance Control monitoring by network to processor 21, fiber grating demodulation device.
Therefore, by processor to temperature controller, wavelength control unit and impulse controller control, then noise spectra of semiconductor lasers is enable to export different wave length, the pulsed laser signal of varying number, utilize wavelength division multiplexer subsequently, optical circulator and photodetector and digital-to-analog conversion, can realize fiber bragg grating center wavelength, especially hyperchannel, long distance, the fiber grating of dense distribution carries out accurately, stable, detect fast, the various occasions of fiber-optic grating sensor application can be applied to, adopt pulse laser output form, detectable long distance, quasi-distributed, multichannel fiber grating, fiber grating demodulation device is made to realize frequency sweep, it is simple that pulse output and fiber grating demodulation device have structure, the features such as the low in energy consumption and cost consumed is low.System no-movable part, anti-vibration ability is strong, and reliability is high, long service life, and demodulating equipment flexible configuration, demodulation speed is higher, can meet the Static and dynamic demodulation requirement of fiber grating.
Claims (7)
1. the fiber grating demodulation device of a based semiconductor laser instrument, described fiber grating demodulation device is disposed with described semiconductor laser, light wavelength division multiplexing, optical circulator and photodetector along optical path direction, described semiconductor laser exports pulsed laser signal to described light wavelength division multiplexing, described light wavelength division multiplexing exports the pulsed laser signal after wavelength-division multiplex to described optical circulator, and described optical circulator is to described photodetector output feedback signal;
It is characterized in that,
Described fiber grating demodulation device also comprises:
D/A conversion unit, described D/A conversion unit receives the fed-back current signals that described photodetector exports;
Processor, described processor receives the feedback voltage signal that described D/A conversion unit exports, and described processor exports corresponding centre wavelength signal according to described feedback voltage signal;
Temperature controller, described temperature controller receives the temperature control signals that described processor exports, and described temperature controller is electrically connected with described semiconductor laser and controls described semiconductor laser and works under preset temperature;
Wavelength control unit, described wavelength control unit receives the wavelength control signal that described processor exports, and described wavelength control unit is electrically connected with described semiconductor laser and controls the pulsed laser signal that described semiconductor laser exports preset wavelength;
Impulse controller, described impulse controller receives the pulse control signal that described processor exports, and described impulse controller is electrically connected with described semiconductor laser and controls the pulsed laser signal that described impulse controller exports predetermined pulse quantity.
2. fiber grating demodulation device according to claim 1, is characterized in that:
Described wavelength control signal comprises multiple wavelength signals, described wavelength control unit also receives the wavelength switching signal that described processor exports, and described wavelength control unit controls described semiconductor laser exports another preset wavelength pulsed laser signal according to described wavelength signals.
3. fiber grating demodulation device according to claim 1, is characterized in that:
Described fiber grating demodulation device also comprises the operational amplifier be arranged between described photodetector and described D/A conversion unit, and described operational amplifier is used for changing described fed-back current signals into voltage signal and being amplified by described voltage signal.
4. fiber grating demodulation device according to claim 3, is characterized in that:
Described operational amplifier receives the amplifier control signal that described processor exports, and described operational amplifier amplifies described voltage signal according to described amplifier control signal.
5. the fiber grating demodulation device according to any one of Claims 1-4, is characterized in that:
Described fiber grating demodulation device also comprises display unit, and described display unit receives described processor output display signal.
6. the fiber grating demodulation device according to any one of Claims 1-4, is characterized in that:
Described fiber grating demodulation device also comprises interface unit, and described processor is received by described interface unit or sends interactive signal.
7. the fiber grating demodulation device according to any one of Claims 1-4, is characterized in that:
Described fiber grating demodulation device also comprises input block, and described processor receives input control signal by described interface unit.
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| CN107359498A (en) * | 2017-09-08 | 2017-11-17 | 北京奥博泰科技有限公司 | A kind of laser signal generator |
| CN110456449A (en) * | 2019-09-12 | 2019-11-15 | 珠海市光辰科技有限公司 | A kind of array single mode device and fiber Bragg grating (FBG) demodulator |
| CN111352144A (en) * | 2020-03-27 | 2020-06-30 | 中国科学院西安光学精密机械研究所 | X-ray ultrafast detection device and method |
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