CN105977773A - Adjustable dual-wavelength feedback based high-stability sweep-frequency optical fiber laser - Google Patents
Adjustable dual-wavelength feedback based high-stability sweep-frequency optical fiber laser Download PDFInfo
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- CN105977773A CN105977773A CN201610455275.3A CN201610455275A CN105977773A CN 105977773 A CN105977773 A CN 105977773A CN 201610455275 A CN201610455275 A CN 201610455275A CN 105977773 A CN105977773 A CN 105977773A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention relates to an adjustable dual-wavelength feedback based high-stability sweep-frequency optical fiber laser. The adjustable dual-wavelength feedback based high-stability sweep-frequency optical fiber laser comprises a sweep-frequency laser module, a second optical fiber coupler, an optical switch and a feedback control module, wherein the output end of the sweep-frequency laser module is connected with the second optical fiber coupler; the sweep-frequency laser emitted from the sweep-frequency laser module passes through the second optical fiber coupler to be divided into two paths, wherein one path outputs the sweep-frequency laser through the optical switch while the other path realizes control on the high-speed tunable filter in the sweep-frequency laser and the optical switch at the laser output end; the second optical fiber laser is 10 to 90 in splitting ratio; 90% of the laser-split ports are connected with the input end of the optical switch; the sweep-frequency laser module outputs the high-power sweep-frequency laser through the optical switch; 10% of the laser-split ports of the second optical fiber laser are connected with the feedback control module; and the output end of the feedback control module is connected with the high-speed tunable filter in a control manner through the optical switch.
Description
Technical field
The present invention relates to a kind of fiber laser technology field, be related specifically to a kind of high stability frequency sweep optical fiber laser based on adjustable double wavelength feedback.
Background technology
Optical fiber sensing technology is studied widely along with the application of optical fiber, and wherein optical fiber sensing technology based on Fiber Bragg Grating FBG is to study a widest direction in current fiber optic sensing applications.Grating sensing technique plays an important role in terms of the monitoring of bridge, tunnel, petroleum pipeline etc., penetrates into the industry-by-industries such as industry, agricultural, space flight, military affairs, medical treatment.Due to frequency swept laser cheap relative to spectroanalysis instrument in terms of the sensing and demodulating of Fiber Bragg Grating FBG, and multichannel multiplexing can be realized, become main demodulation device.
It is to say, in fiber grating sensing demodulation, frequency sweep optical fiber laser light source is the device of most critical, its performance directly determines precision and the efficiency of demodulation；Owing to frequency sweep optical fiber laser generally uses high speed tuning filtering device structure to realize light filtering, acquisition sweeping laser exports, but owing to the chamber length of high speed tuning filtering device is affected by factors such as ambient temperature, humidity, vibrations, chamber length will not become specific relation with voltage.According to investigations, in order to obtain a complete frequency sweep cycle signal in demodulation, the free spectrum voltage range that voltage is 2.5 times of wave filter the most all can be set, it is achieved the frequency sweep at least one cycle, get rid of the interference of environmental factors with this.To this end, during demodulation, capture card needs to gather the most useless signal, occupies acquisition time, reduces collecting efficiency simultaneously.
Owing to the bandwidth by light source is limited, single channel multiplexing number is generally about 30, and wider swept frequency range will be carried out the multiplexing of more fiber grating；High-power sweeping laser can realize Multi-port Coupling output multiplexing.How to realize the key point that the output of adjustable wide-band high power sweeping laser is also optical fiber frequency swept laser.
Summary of the invention
It is an object of the invention to provide a kind of high power frequency sweep optical fiber laser based on adjustable double wavelength feedback for the problem proposed in prior art, the present invention can realize controlled, precise frequency sweep, improve collecting efficiency, and exported by adjustable double wavelength feedback broadband, high power sweeping laser, the more flexible multiplexing achieving more fiber grating and the output of more sensing passage.
Present invention provide the technical scheme that
High stability frequency sweep optical fiber laser based on adjustable double wavelength feedback, including frequency swept laser module, the second fiber coupler, photoswitch and feedback control module, described frequency swept laser module outfan connects the second fiber coupler, the sweeping laser that sweeping laser module sends is divided into two-way by the second fiber coupler, photoswitch of leading up to output sweeping laser；Feedback control module of separately leading up to realizes sweeping laser high speed tunable optic filter and the control of laser output photoswitch, the splitting ratio of described second fiber coupler is 10:90,90% light splitting port connects the input of photoswitch, frequency swept laser module passes through photoswitch output high-power sweeping laser, 10% light splitting port of the second fiber coupler connects feedback control module, and the outfan of described feedback control module controls to connect high-speed tunable filters by photoswitch.
Concrete, described frequency swept laser module includes bandwidth semiconductor optical amplifier one, isolator one, isolator two, first fiber coupler, high-speed tunable filters, isolator three, broadband semiconductor image intensifer two, isolator four, the output port of isolator one is connected to the input of broadband semiconductor image intensifer one, the outfan of broadband semiconductor image intensifer one connects the input of isolator two, the input of high-speed tunable filters connects the outfan of isolator two, the outfan of high-speed tunable filters connects the input of the first fiber coupler, the splitting ratio of the first fiber coupler is 50:50, one output port of the first bonder connects the input port of isolator, constitute frequency sweep loop；Another output port of first bonder connects the input of isolator three, the input port of isolator three connects the input of broadband semiconductor image intensifer two, the input port of isolator four connects the outfan of wide-band optical amplifier two, and the sweeping laser of frequency sweep optical fiber laser module is exported by the output port of isolator four.
Concrete, described feedback control module include the 3rd fiber coupler, tunable filter one, tunable filter the two, the 4th fiber coupler,
Photoelectric conversion module and data process and control module, one outfan of the 3rd fiber coupler connects tunable filter one, another outfan connects tunable filter two, the outfan of tunable filter one and tunable filter two connects point port of the 4th bonder respectively, the optical port that closes of the 4th bonder is connected to the light input end mouth of photoelectric conversion module, and the operational amplifier in photoelectric conversion module is sent in data processing module after converting optical signals into the signal of telecommunication.
Concrete, it is connected between described photoswitch and high-speed tunable filters and has voltage to drive module.
Concrete, the 3rd fiber coupler, the splitting ratio of the 4th bonder are all 50:50.
The present invention compared with prior art has the advantage that frequency swept laser module realizes, by wideband light source and filter construction, the output that high-speed wideband frequency sweep is exported and realized high-power sweeping laser by paump stage semiconductor optical amplifier；In the high power frequency sweep optical fiber laser of this adjustable double wavelength feedback, using two tunable filters to realize wavelength tuning output at the whole story, described adjusting wavelength maximum at the whole story corresponds to the frequency sweep spectral region of the sweeping laser output of scan module；It is somebody's turn to do in frequency sweep optical fiber laser based on wavelength feedback, signal of telecommunication output is triggered based on double filtering, and carry out secondary triggering, form a frequency sweep cycle signal of telecommunication output, in the high power frequency sweep optical fiber laser of this adjustable double wavelength feedback, the cycle frequency sweep signal of telecommunication triggered by secondary realizes the frequency sweep to a complete spectrum, is not take up too much data, and efficiency is higher；In the high power frequency sweep optical fiber laser of this adjustable double wavelength feedback, the cycle frequency sweep signal of telecommunication triggered by secondary, control the photoswitch of swept laser system outfan, it is achieved the modulation output of sweeping laser；In the high power frequency sweep optical fiber laser of this adjustable double wavelength feedback, drive in module by feeding back to the voltage of high-speed tunable filters, Intelligent adjustment controls output voltage signal, realize the output of high power adjustable precisely controlled sweeping laser, improve sample frequency and precision, there is preferably application scenarios.
Accompanying drawing explanation
Fig. 1 is present configuration simplified schematic diagram；
Fig. 2 is that dual wavelength based on adjustable double wavelength feedback optical fiber laser fixed point scanning secondary triggers schematic diagram.
1 isolator 1 broadband semiconductor image intensifer 1 isolator 24 first fiber coupler
5 high-speed tunable filters 6 isolator 37 broadband semiconductor image intensifers two
8 isolator 49 second fiber coupler 10 the 3rd fiber coupler 11 tunable filters one
12 tunable filter 2 13 the 4th fiber coupler 14 photoelectric conversion modules
15 data process and control module 16 photoswitch 17 voltage drives module
18 frequency swept laser module 19 feedback control module.
Detailed description of the invention
It is illustrated in figure 1 the structural representation of high stability frequency sweep optical fiber laser based on adjustable double wavelength feedback, it includes frequency swept laser module the 18, second fiber coupler 9, photoswitch 16 and feedback control module 19, described frequency swept laser module 18 outfan connects the second fiber coupler 9, the sweeping laser that sweeping laser module 18 sends is divided into two-way by the second fiber coupler 9, and photoswitch 16 of leading up to exports sweeping laser；Feedback control module 19 of separately leading up to realizes sweeping laser high speed tunable optic filter 5 and the control of laser output photoswitch 16, the splitting ratio of described second fiber coupler 9 is 10:90, 90% light splitting port connects the input of photoswitch 16, frequency swept laser module 18 is by photoswitch 16 output high-power sweeping laser, 10% light splitting port of the second fiber coupler 9 connects feedback control module 19, the outfan of described feedback control module 19 controls to connect high-speed tunable filters 5 by photoswitch 16, it is connected between photoswitch 16 with high-speed tunable filters 5 and has voltage to drive module 17.
Described frequency swept laser module 18 includes bandwidth semiconductor optical amplifier 1, isolator 1, isolator 23, first fiber coupler 4, high-speed tunable filters 5, isolator 36, broadband semiconductor image intensifer 27, isolator 48, the output port of isolator 1 is connected to the input of broadband semiconductor image intensifer 1, the outfan of broadband semiconductor image intensifer 1 connects the input of isolator 23, the input of high-speed tunable filters 5 connects the outfan of isolator 23, the outfan of high-speed tunable filters 5 connects the input of the first fiber coupler 4, the splitting ratio of the first fiber coupler 4 is 50:50, one output port of the first bonder 4 connects the input port of isolator 1, constitute frequency sweep loop；Another output port of first bonder 4 connects the input of isolator 36, the input port of isolator 36 connects the input of broadband semiconductor image intensifer 27, the input port of isolator 48 connects the outfan of broadband semiconductor image intensifer 27, the sweeping laser of frequency sweep optical fiber laser module 18 is exported by the output port of isolator 48, frequency swept laser module 18 realizes high-speed wideband frequency sweep by wideband light source and filter construction and exports and pass through paump stage semiconductor optical amplifier 1 and broadband semiconductor image intensifer 27 realizes the output of high-power sweeping laser.
Described feedback control module 19 includes that the 3rd fiber coupler 10, tunable filter 1, tunable filter the 2 12, the 4th fiber coupler 13, photoelectric conversion module 14 and data process and control module 15,3rd fiber coupler 10 splitting ratio is 50:50, one outfan of the 3rd fiber coupler 10 connects tunable filter 11, and another outfan connects tunable filter 12；nullThe outfan of tunable filter 11 and tunable filter 12 connects point port of the 4th bonder 13 respectively，4th bonder 13 splitting ratio be 50:50，The optical port that closes of the 4th bonder 13 is connected to the light input end mouth of photoelectric conversion module 14，Operational amplifier in photoelectric conversion module 14 is sent in data processing module 15 after converting optical signals into the signal of telecommunication and amplifying output，Electrical level discrimination circuit in data processing module 15 is a comparator，Voltage signal is normalized to high level and low level output，And form high trigger signal further，Form two grades of high level and low level，Trigger through secondary high level again and realize a frequency sweep cycle signal of telecommunication output，As a frequency sweep cycle，Simultaneously，The output voltage values of record relevant voltage control module 17，And carry out signal processing，The dynamic stability of sweep voltage signal is regulated，Realize a cycle stability frequency sweep.Centre wavelength is 1550nm, and swept bandwidth is 80nm broadband frequency sweep, and swept frequency is that 100Hz to 2KHz is adjustable, and output is 30mW.
On the other hand, the data of collection are delivered to data processing module 15 and carry out data process by photoelectric conversion module 14, record tunable filter 1 and the time of occurrence point of tunable filter 2 12 wavelength at the whole story, and export cycle synchronisation triggering signal, the voltage when whole story of record tunable filter 1 and tunable filter 2 12, wavelength occurred drives the voltage output value of module 17, regulate output voltage values in real time, realize the laser frequency sweep of a tunable optical spectral limit, and trigger control photoswitch 16 realize the adjustable output of sweeping laser, realize filter voltage is driven module 17 and the optimal control of photoswitch 16.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit；Although being described in detail the present invention with reference to preferred embodiment, those of ordinary skill in the field are it is understood that still can modify to the detailed description of the invention of the present invention or portion of techniques feature is carried out equivalent；Without deviating from the spirit of technical solution of the present invention, it all should be contained in the middle of the technical scheme scope that the present invention is claimed.
Claims (5)
1. high stability frequency sweep optical fiber laser based on adjustable double wavelength feedback, including frequency swept laser module (18), the second fiber coupler (9), photoswitch (16) and feedback control module (19), described frequency swept laser module (18) outfan connects the second fiber coupler (9), it is characterized in that, the sweeping laser that sweeping laser module (18) sends is divided into two-way by the second fiber coupler (9), photoswitch (16) of leading up to output sweeping laser；Feedback control module (19) of separately leading up to realizes sweeping laser high speed tunable optic filter (5) and the control of laser output photoswitch (16), the splitting ratio of described second fiber coupler (9) is 10:90, 90% light splitting port connects the input of photoswitch (16), frequency swept laser module (18) passes through photoswitch (16) output high-power sweeping laser, 10% light splitting port of the second fiber coupler (9) connects feedback control module (19), the outfan of described feedback control module (19) controls to connect high-speed tunable filters (5) by photoswitch (16).
nullHigh stability frequency sweep optical fiber laser based on adjustable double wavelength feedback the most according to claim 1，It is characterized in that，Described frequency swept laser module (18) includes bandwidth semiconductor optical amplifier one (2)、Isolator one (1)、Isolator two (3)、First fiber coupler (4)、High-speed tunable filters (5)、Isolator three (6)、Broadband semiconductor image intensifer two (7)、Isolator four (8)，The output port of isolator one (1) is connected to the input of broadband semiconductor image intensifer one (2)，The outfan of broadband semiconductor image intensifer one (2) connects the input of isolator two (3)，The input of high-speed tunable filters (5) connects the outfan of isolator two (3)，The outfan of high-speed tunable filters (5) connects the input of the first fiber coupler (4)，The splitting ratio of the first fiber coupler (4) is 50:50，One output port of the first bonder (4) connects the input port of isolator (1)，Constitute frequency sweep loop；Another output port of first bonder (4) connects the input of isolator three (6), the input port of isolator three (6) connects the input of broadband semiconductor image intensifer two (7), the input port of isolator four (8) connects the outfan of wide-band optical amplifier two (7), and the sweeping laser of frequency sweep optical fiber laser module (18) is exported by the output port of isolator four (8).
nullHigh stability frequency sweep optical fiber laser based on adjustable double wavelength feedback the most according to claim 1，It is characterized in that，Described feedback control module (19) includes the 3rd fiber coupler (10)、Tunable filter one (11)、Tunable filter two (12)、4th fiber coupler (13)、Photoelectric conversion module (14) and data process and control module (15)，One outfan of the 3rd fiber coupler (10) connects tunable filter one (11)，Another outfan connects tunable filter two (12)，The outfan of tunable filter one (11) and tunable filter two (12) connects point port of the 4th bonder (13) respectively，The conjunction optical port of the 4th bonder (13) is connected to the light input end mouth of photoelectric conversion module (14)，Operational amplifier in photoelectric conversion module (14) is sent in data processing module (15) after converting optical signals into the signal of telecommunication.
High stability frequency sweep optical fiber laser based on adjustable double wavelength feedback the most according to claim 1, it is characterised in that be connected between described photoswitch (16) with high-speed tunable filters (5) and have voltage to drive module (17).
High stability frequency sweep optical fiber laser based on adjustable double wavelength feedback the most according to claim 3, it is characterised in that the 3rd fiber coupler (10), the splitting ratio of the 4th bonder (13) are all 50:50.
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| CN201610455275.3A CN105977773A (en) | 2016-06-22 | 2016-06-22 | Adjustable dual-wavelength feedback based high-stability sweep-frequency optical fiber laser |
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Cited By (3)
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|---|---|---|---|---|
| CN110518442A (en) * | 2019-07-10 | 2019-11-29 | 杭州电子科技大学 | Dual wavelength lead selenide quantum dot optical fiber laser with super continuous spectrum |
| CN111668689A (en) * | 2020-05-29 | 2020-09-15 | 华南理工大学 | Dual-wavelength high-speed frequency sweep synchronous pulse light source |
| CN116937315A (en) * | 2023-09-15 | 2023-10-24 | 山东弘信光学科技有限公司 | Double-end output multi-wavelength fiber laser |
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| CN116937315A (en) * | 2023-09-15 | 2023-10-24 | 山东弘信光学科技有限公司 | Double-end output multi-wavelength fiber laser |
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