CN105337149A - Pulse narrow linewidth fiber laser based on graphene micro fiber ring modulation - Google Patents
Pulse narrow linewidth fiber laser based on graphene micro fiber ring modulation Download PDFInfo
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- CN105337149A CN105337149A CN201510926127.0A CN201510926127A CN105337149A CN 105337149 A CN105337149 A CN 105337149A CN 201510926127 A CN201510926127 A CN 201510926127A CN 105337149 A CN105337149 A CN 105337149A
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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
- H01S3/06791—Fibre ring lasers
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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
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/038—Electrodes, e.g. special shape, configuration or composition
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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
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/038—Electrodes, e.g. special shape, configuration or composition
- H01S3/0388—Compositions, materials or coatings
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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Abstract
The invention relates to the technical field of optical engineering, material engineering and fiber optics, in particular to a pulse narrow linewidth fiber laser based on graphene micro fiber ring modulation. The pulse narrow linewidth fiber laser is structurally characterized in that the pulse narrow linewidth fiber laser is formed by cascade connection of a micro fiber ring resonant cavity and a gain distributed feedback fiber Bragg grating which are drawn and linked through a single mode fiber of a 980 nanometer waveband, a graphene film is used to cover part of the micro fiber ring resonant cavity, the two sides of the graphene film are covered with metal electrodes, and the whole micro fiber ring resonant cavity is fixed to a silicon dioxide substrate. Through pumping of a 980 waveband continuous light source, laser output of the narrow linewidth and adjustable pulse can be generated. The pulse narrow linewidth fiber laser further has extremely high practicality, the frequency domain line width is 2-3k hertz, the maximum modulation speed is 10G hertz, the signal-to-noise ratio is 20 dB, and the pulse narrow linewidth fiber laser can be extensively directly used to all fiber sensing and communication systems.
Description
Technical field
The present invention relates to optical engineering, material engineering and fiber optics technical field, be specifically related to optical-fiber laser, modulation and sensing technology.
Background technology
Pulse laser, as a kind of important optics, all has important application widely in scientific research and industrial production, as higher source luminance, and light signal occurring source, laser cutting cutter, modulation /demodulation element etc.Along with development that is economic and science and technology, people's paired pulses laser proposes more and more higher demand, as: ultrafast, high-power, high speed tunable, optical sensing etc.
Particularly at long distance light sensory field, require that the pulse laser as light source had both had adjustable pulse characteristic, have again narrow linewidth characteristic, can also export high-peak power, be all huge challenge in theory and reality.
Current, pulse laser is generally divided three classes in operation principle, that is: Mode-locked laser device, Q-switched pulse laser and external modulation type pulse laser.Simple locked mode, adjust the rigors that Q and external modulation type pulse laser all can not meet filter with low insertion loss, narrow linewidth pulsed light that high speed is adjustable exports.Specifically, mode-locked laser and Q-switched laser are generally difficult to the regulation and control carrying out repetition and pulsewidth, and can not realize the output of narrow linewidth principle.External modulation type pulse laser is limited by external modulator, and insertion loss is higher, modulation rate low (megahertz level).
In addition, traditional pulse laser limits by material, technique and cost, more adopts semiconductor structure.But semiconductor pulse laser also exists many restrictions, very difficult output is tunable on a large scale, the pulse of high-peak power.
This problem that develops into of fiber laser provides new solution.Laser Devices based on all-fiber have low cost, low-loss, easily access, can expand and can the unique advantage of networking, can export larger power, the pattern that higher bandwidth sum is purer, in Modern optical communication and light sensing, play more and more important role.Based on all-fiber locked mode, adjust Q and modulation type pulse laser also constantly being invented in recent years and improving.Even so, use optical fiber structure, take into account pulse characteristic and narrow linewidth characteristic simultaneously, also there is difficulty, often need the combination of multiple devices such as fiber laser, fiber optic modulator, optical fiber filter, so just increase complexity and the cost of system.
Summary of the invention
For above-mentioned existing problems or deficiency, the problem of the adjustable pulsed light output of high speed cannot be realized to solve traditional narrow cable and wide optical fiber laser in same device, the invention provides a kind of impulse type narrow cable and wide optical fiber laser based on the modulation of Graphene micro optical fiber ring.
Its architectural feature is: by 980 nano wavebands monomode fiber draw and looper tie micro optical fiber ring shape resonator (MFR) and gain-type distributed-feedback Prague fiber grating (DFB) formed by coupler cascade; At micro optical fiber annular chamber away from position, coupled zone, cover the rectangle graphene film of one deck width 1 millimeter, on the upside of the two ends then not covering micro optical fiber annular chamber at graphene film, grow pair of electrodes.This micro optical fiber ring is positioned in silicon dioxide substrates, and is fixedly close to by Van der Waals force.
Its design parameter is: micro optical fiber diameter 1 micron, length 1 ~ 2 centimetre, micro optical fiber ring diameter 0.5 millimeter, and micro optical fiber ring knotting coupled region length is 5 ~ 6 microns, and graphene film is the single-layer graphene of 0.38 nanometer thickness 1 mm wide.Electrode material on graphene film is gold, for applying the modulation voltage of ± 20 volts.Silicon dioxide substrates area is 1 square centimeter, and thickness is 3 millimeters.The gain-type distributed feedback bragg grating adopted, be scribed in the two monomode fiber fibre core mixed of erbium ytterbium, core diameter is 6 microns, and grating length is 2 centimetres.
Should based on the impulse type narrow cable and wide optical fiber laser of Graphene micro optical fiber ring modulation, it is characterized in that: using 980 nano waveband laser as pump light source, its output is the narrow linewidth adjustable pulse of 1550 ~ 1560 nano wavebands, swash that to penetrate efficiency be 0.5% ~ 1%, output signal is the adjustable pulse of 1550 ~ 1560 nano wavebands, its frequency domain live width is 2 ~ 3k hertz, and maximum modulation speed is 10G hertz, and signal to noise ratio is 20 decibels.
In the invention, single-layer graphene plays an important role, to complete the chopping modulation to the pumping of injecting gain media.Single-layer graphene, thickness is 0.38nm, as a kind of two-dimensional material, be the maximum thin-film material of the surface area/volume ratio reported at present, have unique physicochemical properties, wherein one of most typical is the tunable effect of photoelectricity based on Fermi level, the carrier concentration of Graphene is regulated by applied voltage, can significantly regulate its optical transmission loss, and then regulate the entirety of the micro optical fiber ring in the present invention at specific band, and then form time domain impulse.In addition, in the invention, gain-type distributed-feedback Prague fiber grating as producing component and the narrow linewidth filter part of laser, exports the laser of narrow linewidth simultaneously at reflection end.Pulse pump by Graphene modulation encourages, and it exports also is pulse.
The course of work of the present invention is: by the monomode fiber of 980 nano wavebands, 980 nanometer continuous light pumpings is injected in fiber annular resonant cavity, and is formed and interfere, and makes the interference point (ResonantDip) that disappears mutually be positioned at 980 nanometers.Meanwhile, by the modulation voltage of the electrode access period change on Graphene, to regulate the optical attenuation of Graphene overlay area.When the decay of Graphene overlay area is strong, light signal is more difficult is coupled into ring resonator, thus show as strong output and namely interfere and slacken mutually, when the decay of Graphene overlay area is weak, ring resonator has high Q characteristic, light signal is more retained in ring resonator, thus show as weak output namely interfere disappear mutually strong.At output, namely form the pulse pump by electrical modulation.Gain-type distributed-feedback Prague fiber grating is injected in this pumping, produces the laser of 1550 nano wavebands, and is exported by reflection end.This laser temporal characteristic is consistent with pumping, is the pulse laser modulated based on Graphene.Meanwhile, distributed-feedback Prague fiber grating itself has narrow linewidth filtering characteristic, so the pulse laser exported also has the characteristic of narrow linewidth.
In sum, the present invention has low cost, low-loss, and volume is little, simple and compact for structure and make simple feature, convenient application; By conventional 980 wave band continuous light source pumpings, can produce is narrow linewidth, is again the Laser output of adjustable pulse; Also have extremely strong practicality, its frequency domain live width is 2 ~ 3k hertz, and maximum modulation speed is 10G hertz, and signal to noise ratio is 20 decibels, can by the sensing that is directly used in all-fiber widely and communication system.
Accompanying drawing explanation
Fig. 1 is three-dimensional structure schematic diagram of the present invention;
Fig. 2 is the micrograph that Graphene of the present invention covers micro optical fiber ring structure;
Fig. 3 is of the present invention is embodiment system diagram;
Fig. 4 is application modulation result schematic diagram of the present invention;
Reference numeral: the ring resonator that the knotting of 1-micro-nano fiber is formed, 2-single-layer graphene film, 3-gold electrode, 4-980 nano waveband monomode fiber, 5-1550 nano waveband monomode fiber, 6-distributed-feedback Prague fiber grating, 7-silicon dioxide substrates, the pumping of 8-980 nanometer continuous light, 9-wave division multiplex coupler.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
Shown in composition graphs 1, Fig. 2, Fig. 3, Fig. 4, by the monomode fiber of 980 nano wavebands, the micro optical fiber of diameter 1 micron is prepared as by fused biconical taper method, length 2 centimetres, and be knotted into Knot annular by probe traction, this micro optical fiber ring diameter 0.5 millimeter, micro optical fiber ring knotting coupled region length is 5 microns.This micro optical fiber ring is placed in silicon dioxide substrates, and is fixedly close to by Van der Waals force.At micro optical fiber annular chamber away from position, coupled zone, by CVD method and wet method transfer techniques, cover a layer thickness 0.38 nanometer, the single-layer graphene film that width is 1 millimeter.Then, by magnetron sputtering technique, on the upside of the two ends not covering micro optical fiber ring at graphene film, grow a pair gold electrode.Gold electrode area coverage 1 millimeter * 0.5 millimeter, thickness of electrode 130 nanometer.The output of micro optical fiber ring resonator is coupled in 3 decibels of wave division multiplex couplers, another termination gain-type distributed-feedback Prague fiber grating of wave division multiplex coupler, this distributed-feedback Prague fiber grating is scribed in the two monomode fiber fibre core mixed of erbium ytterbium, core diameter is 6 microns, and grating length is 2 centimetres.
In laser work process, injected the continuous light pumping of 980 nano wavebands by the input of ring resonator, apply on gold electrode simultaneously fast modulation ± modulation voltage of 20 volts.At ring resonator output, namely export the pulse pump by fast modulation.In gain-type distributed-feedback Prague fiber grating, by pumping pumping, produce the laser of 1550 nano wavebands, and backward output, and by wave division multiplex coupler be separated into 1550 pure nano wavebands by modulation pulse laser.This laser presents narrow linewidth characteristic due to the filtering characteristic of distributed-feedback Prague fiber grating.
Above-mentioned specific implementation method is used for explaining and apparatus of the present invention is described, instead of limits the invention, and in the protection range of spirit of the present invention and claims, to any change of the present invention and variation, all falls into protection scope of the present invention.
Claims (4)
1. based on Graphene micro optical fiber ring modulation an impulse type narrow cable and wide optical fiber laser, its architectural feature is: by 980 nano wavebands monomode fiber draw and looper tie micro optical fiber ring shape resonator MFR and gain-type distributed-feedback Prague fiber grating DFB formed by coupler cascade; At micro optical fiber ring resonator away from position, coupled zone, cover the graphene film of one deck 1 mm wide, pair of electrodes is grown on the upside of the two ends then not covering micro optical fiber annular chamber at graphene film, this micro optical fiber ring resonator is made to be positioned in silicon dioxide substrates, and be fixedly close to by Van der Waals force, graphene film is the individual layer rectangle Graphene of 0.38 nanometer thickness.
2. as claimed in claim 1 based on the impulse type narrow cable and wide optical fiber laser of Graphene micro optical fiber ring modulation, it is characterized in that: described micro optical fiber diameter 1 micron, length 1 ~ 2 centimetre, micro optical fiber ring diameter 0.5 millimeter, micro optical fiber ring knotting coupled region length is 5 ~ 6 microns; Electrode material on described graphene film is gold, for applying the modulation voltage of ± 20 volts; Described silicon dioxide substrates area is 1 square centimeter, and thickness is 3 millimeters; The gain-type distributed feedback bragg grating adopted, be scribed in the two monomode fiber fibre core mixed of erbium ytterbium, core diameter is 6 microns, and grating length is 2 centimetres.
3. as claimed in claim 1 or 2 based on the impulse type narrow cable and wide optical fiber laser of Graphene micro optical fiber ring modulation, it is characterized in that: using 980 nano waveband laser as pump light source, its output is the narrow linewidth adjustable pulse of 1550 ~ 1560 nano wavebands, swash that to penetrate efficiency be 0.5% ~ 1%, output signal is the adjustable pulse of 1550 ~ 1560 nano wavebands, its frequency domain live width is 2 ~ 3k hertz, and maximum modulation speed is 10G hertz, and signal to noise ratio is 20 decibels.
4., as claimed in claim 1 or 2 based on the impulse type narrow cable and wide optical fiber laser of Graphene micro optical fiber ring modulation, its course of work is:
By the monomode fiber of 980 nano wavebands, 980 nanometer continuous light pumpings are injected in fiber annular resonant cavity, and are formed and interfere, and make an interference ResonantDip that disappears mutually be positioned at 980 nanometers; Meanwhile, by the modulation voltage of the electrode access period change on Graphene, to regulate the optical attenuation of Graphene overlay area;
When the decay of Graphene overlay area is strong, light signal is more difficult is coupled into ring resonator, thus show as strong output and namely interfere and slacken mutually, when the decay of Graphene overlay area is weak, ring resonator has high Q characteristic, light signal is more retained in ring resonator, thus show as weak output namely interfere disappear mutually strong; At output, namely form the pulse pump by electrical modulation; Gain-type distributed-feedback Prague fiber grating is injected in this pumping, produces the laser of 1550 nano wavebands, and is exported by reflection end.
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| CN201510926127.0A CN105337149B (en) | 2015-12-14 | 2015-12-14 | A kind of impulse type narrow cable and wide optical fiber laser based on the modulation of graphene micro optical fiber ring |
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| CN201510926127.0A CN105337149B (en) | 2015-12-14 | 2015-12-14 | A kind of impulse type narrow cable and wide optical fiber laser based on the modulation of graphene micro optical fiber ring |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785861A (en) * | 2017-03-01 | 2017-05-31 | 太原理工大学 | Gao Zhongying ultra-short pulse generation method and device based on Graphene microcavity locked mode |
| CN109193326A (en) * | 2018-09-27 | 2019-01-11 | 电子科技大学 | A kind of fiber optic microsphere chamber mode-locked laser based on graphene-channel structure |
| CN111916981A (en) * | 2020-06-12 | 2020-11-10 | 南京大学深圳研究院 | Two-dimensional material integrated structure mode-locked fiber laser and construction method thereof |
| US11811188B2 (en) | 2020-10-29 | 2023-11-07 | Korea Institute Of Science And Technology | System for generating passive-mode-locked pulse laser at high repetition rate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785861A (en) * | 2017-03-01 | 2017-05-31 | 太原理工大学 | Gao Zhongying ultra-short pulse generation method and device based on Graphene microcavity locked mode |
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| CN109193326B (en) * | 2018-09-27 | 2021-03-30 | 电子科技大学 | Optical fiber microsphere cavity mode-locked laser based on graphene channel structure |
| CN111916981A (en) * | 2020-06-12 | 2020-11-10 | 南京大学深圳研究院 | Two-dimensional material integrated structure mode-locked fiber laser and construction method thereof |
| US11811188B2 (en) | 2020-10-29 | 2023-11-07 | Korea Institute Of Science And Technology | System for generating passive-mode-locked pulse laser at high repetition rate |
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