CN105511200A - All-optical modulator with graphene-micro-nano optical fiber composite structure - Google Patents
All-optical modulator with graphene-micro-nano optical fiber composite structure Download PDFInfo
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- CN105511200A CN105511200A CN201610096874.0A CN201610096874A CN105511200A CN 105511200 A CN105511200 A CN 105511200A CN 201610096874 A CN201610096874 A CN 201610096874A CN 105511200 A CN105511200 A CN 105511200A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/002—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light using optical mixing
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
- G02F2/006—All-optical wavelength conversion
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- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides an all-optical modulator with a graphene-micro-nano optical fiber composite structure, and relates to the technical field of optical communication and sensing and transmission. The all-optical modulator comprises a magnesium fluoride substrate, a micro-nano optical fiber and a graphene thin film; the micro-nano optical fiber comprises an input optical fiber and an output optical fiber which are fixed on the magnesium fluoride substrate, the input optical fiber and the output optical fiber are arranged in a spaced mode and covered with the graphene thin film, and the connector ends of the input optical fiber and the output optical fiber are arranged outside the magnesium fluoride substrate. The all-optical modulator has the advantages of being small in size, high in response speed, simple in preparation technology, free of waveguide and optical fiber coupling, easy to package, low in cost, beneficial for all-optical fibering, capable of achieving operating wavelength at wide light band covering visible light and near-infrared band and the like. According to the all-optical modulator, a graphene tapering optical fiber structure is adopted, and the system error and optical losses are both small.
Description
Technical field
The present invention relates to optical communication and sensing transmission technique field thereof, be specifically related to a kind of modulating device of light signal.
Background technology
Optical communication technique, as the core of modern communications backbone network, supports the information industry in the present age.Light modulation techniques is the basis of optical communication, and its effect is loaded on light wave by bit signal, namely produced the light pulse of being modulated by continuous print on-off action.Based on principles such as electrooptical effect, acoustooptic effect, magneto-optic effect, Franz-Keldysh effect, quantum well Stark effect, carrier dispersion effects, people have developed various optical modulation device.
Traditional electric light, acousto-optic modulator are all the modulation being realized light signal by crystal, destroy all optical fibre structure, and are not easy to coupling, the shortcomings such as loss is large.Although there is now all-fiber modulator based on Fiber Bragg Grating FBG, this modulator has needed to carry out special formulation Bragg grating for different operation wavelengths, and response speed is slower.Based on the shortcoming of above-mentioned photomodulator, the development for the full photomodulator of the wide light belt of all optical fibre structure is extremely urgent.
Full optical modulation directly can realize all optical communication, can avoid the defect in circuit communication system.In information society, the growing market of impelling of data communication and the Internet constantly increases transfer rate and traffic capacity demands, thus the demand of optical transport network also increases rapidly, in Large Copacity optical transmission system, essential to the High Speed Modulation of light signal.Full optical modulation is the Primary Component of high speed, long-distance optical communication, is also most important integrated optical device.
From Graphene, isolate Graphene from Univ Manchester UK physicist Hai Mu and Nuo Woxiaoluofu success, this only have the material of one deck atomic thickness because of its peculiar structure and excellent performance, attracted the enthusiasm that people are huge.Graphene is the semiconductor material of zero band gap, and its band structure is in K space in the biconial to top, and Fermi level is on dirac point.The band structure of this uniqueness of Graphene just, makes Graphene have the interaction of wide light belt, can covering visible light and near infrared.In addition due to the existence of choking phenomenon in bubble, there is saturable absorption phenomenon in Graphene.There are two feature relaxation times: the band carriers thermal equilibrium realized by carrier-carrier scattering in the saturable absorption process of Graphene, and charge carrier-phon scattering subsequently and interband Carrier recombination process.Band carriers heat balance time is extremely short, within the scope of 10-107fs.The interband charge carrier thermally equilibrated time is longer, at about 0.4-1.7ps.Ability time response of the saturable absorption characteristic of visible Graphene is exceedingly fast.Due to blocking effect in the bubble of Graphene, when lower powered light is by Graphene, the transmitance of light is lower; When high-power light is by Graphene, the transmitance of light is higher.So based on zero bandgap structure of blocking effect and its uniqueness in the such saturable absorption characteristic of Graphene, bubble, we can construct full photomodulator by regulating the power of regulation and control light to change signal light power based on Graphene.
A large amount of single modulator using individual packages in existing optical communication system, the Graphene modulator based on waveguiding structure needs in its two ends connecting fiber, so that compatible with optical communication system; Simultaneously waveguide can produce larger loss with being coupled between optical fiber; And the cost of waveguide footprint also can increase the cost of device.Therefore design a kind of cheapness, the full photomodulator of low-loss novel Graphene is significant.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of full photomodulator and method thereof of wide light belt of all-fiber based on grapheme material is provided.
The present invention includes magnesium fluoride substrate, micro-nano fiber, graphene film, described micro-nano fiber comprises input optical fibre, output optical fibre, described input optical fibre, output optical fibre are separately fixed on described magnesium fluoride substrate, interval between described input optical fibre, output optical fibre, described graphene film covers on described input optical fibre, output optical fibre, and the tip side of described input optical fibre, output optical fibre is separately positioned on outside magnesium fluoride substrate.
Taper is arranged in the end that input optical fibre of the present invention, output optical fibre cover under described graphene film.
The edge of input optical fibre of the present invention, output optical fibre and described magnesium fluoride substrate is fixed by glue.
The fitting end single-mode fiber access light path of described micro-nano fiber connects, and propagates control light and flashlight.Describedly carry out connection regulation and control light modulating signal and flashlight by micro-nano fiber weld wavelength division multiplexer, control the evanescent field strength near micro-nano fiber by regulation and control light intensity.
Described magnesium fluoride substrate refractive index is 1.3 ~ 1.4, preferably 1.37, and described micro-nano fiber diameter is 0.1 ~ 2 μm.
The described graphene film covered on micro-nano fiber is individual layer.
The step of the method for making of the full photomodulator of all-fiber based on grapheme material is as follows:
1) the monofilm optical fiber first diameter being about 125 μm is heated by oxyhydrogen flame, and is undertaken drawing cone to process by stepper motor, draws cone diameter to be made as 0.1-2 μm;
2) by drawing the micro-nano fiber of cone process to be laid on the flat plate substrate of magnesium fluoride, fix with glue;
3) cone place is drawn what be fitted in micro-nano fiber using organism (PDMS) as the graphene film of substrate;
4) wavelength division multiplexer that suitable wavelength can be welded in micro-nano fiber two ends realizes the coupling of regulation and control light and flashlight and is separated;
Compared with prior art it is full photomodulator in the present invention, namely with the other a branch of flashlight of control photocontrol with signal, for all-optical information transmission with disposal system;
Optical fiber is for drawing cone PROCESS FOR TREATMENT, and be circle symmetric form, method is simple, easily operates;
The Graphene adopted is to the saturable absorption effect of light and the two-beam crossover loss mudulation effect at Graphene;
In sum, compared with prior art, the beneficial effect had is as follows in the present invention: this full photomodulator volume is little, fast response time, preparation technology are simple, without the need to waveguide fiber coupling, encapsulation easily, the advantage such as cost is low, be beneficial to all-fiber, the operation wavelength of wide light belt (covering visible light and near-infrared band).This full photomodulator have employed Graphene tapered fiber structure, and systematic error and light loss are all very little.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the cross-sectional cut-away schematic diagram of Fig. 1;
Fig. 3 is the structural drawing of Graphene;
Fig. 4 is work wave schematic diagram of the present invention.
Specific embodiment
As shown in Figure 1, 2, this Graphene-full photomodulator of micro-nano fiber composite structure comprises magnesium fluoride substrate 1, micro-nano fiber 2, graphene film 3, micro-nano fiber 2 comprises input optical fibre, output optical fibre, input optical fibre, output optical fibre are separately fixed on described magnesium fluoride substrate 1, interval between input optical fibre, output optical fibre, graphene film 3 covers on input optical fibre, output optical fibre, the graphene film 3 covered on micro-nano fiber 2 is individual layer, and the tip side of input optical fibre, output optical fibre is separately positioned on outside magnesium fluoride substrate 1.Taper is arranged in the end that input optical fibre, output optical fibre cover under graphene film 3.The edge of input optical fibre, output optical fibre and magnesium fluoride substrate 1 is fixed by glue.Magnesium fluoride substrate 1 refractive index is 1.3 ~ 1.4, preferably 1.37, and described micro-nano fiber diameter is 0.1 ~ 2 μm.
The step of the method for making of the full photomodulator of all-fiber based on grapheme material is as follows:
1) the monofilm optical fiber first diameter being about 125 μm is heated by oxyhydrogen flame, and is undertaken drawing cone to process by stepper motor, draws cone diameter to be made as 0.1-2 μm;
2) by drawing the micro-nano fiber of cone process to be laid on the flat plate substrate of magnesium fluoride, fix with glue;
3) cone place is drawn what be fitted in micro-nano fiber using organism (PDMS) as the graphene film of substrate;
4) wavelength division multiplexer that suitable wavelength can be welded in micro-nano fiber two ends realizes the coupling of regulation and control light and flashlight and is separated;
Embodiment:
As shown in Figure 1, 2, 3, diameter is that micro-nano fiber 2 attaching of 0.1 ~ 2 μm is fixed on the magnesium fluoride substrate 1 of 1cm*2cm, covers area 25 μm on magnesium fluoride on-chip micro-nano fiber 2 upper strata
2single-layer graphene film 3, finally, for protecting whole modulator structure, the glue being about 1.37 with refractive index carries out upper surface coating encapsulation, only reserves fibre-optical splice.In practice process, regulation and control light is interacted by evanscent field and Graphene 3 by fibre-optical splice 2 together with the wavelength division multiplexer of suitable wavelength with flashlight, modulated light signal impact, the input signal light of intensity constant enters from input end 2, along with the increase of the power input of the regulation and control light of continuous wavelength, the power that flashlight exports from output terminal 4 increases gradually.Regulation and control light is changed into laser pulse input, and under the modulating action of regulation and control light, the flashlight of intensity constant becomes modulated pulse at light signal output end 4.The solution wavelength division multiplexer welding suitable wavelength at output terminal 4 is separated regulation and control light with flashlight.
The thickness of whole Graphene-full photomodulator of micro-nano fiber composite structure is about 5mm.Its course of work is, input optical signal is propagated between substrate and Graphene overlayer along micro-nano fiber, intensity is constant, modulated light signal is also propagated along micro-nano fiber by fibre-optical splice between substrate and Graphene overlayer, when the change of the power cycle of regulation and control light will the photoconduction passband of rhythmic change Graphene, and then the evanescent field strength along graphene film conduction is changed with regulation and control light signal, the light pulse sequence of modulated optical modulation is obtained at output terminal.
Claims (7)
1. Graphene-full photomodulator of micro-nano fiber composite structure, comprise magnesium fluoride substrate, micro-nano fiber, graphene film, it is characterized in that described micro-nano fiber comprises input optical fibre, output optical fibre, described input optical fibre, output optical fibre are separately fixed on described magnesium fluoride substrate, interval between described input optical fibre, output optical fibre, described graphene film covers on described input optical fibre, output optical fibre, and the tip side of described input optical fibre, output optical fibre is separately positioned on outside magnesium fluoride substrate.
2. Graphene according to claim 1-full photomodulator of micro-nano fiber composite structure, is characterized in that described input optical fibre, end that output optical fibre covers under described graphene film is arranged to taper.
3. Graphene according to claim 1-full photomodulator of micro-nano fiber composite structure, is characterized in that the edge of described input optical fibre, output optical fibre and described magnesium fluoride substrate is fixed by glue.
4. Graphene according to claim 1-full photomodulator of micro-nano fiber composite structure, is characterized in that described magnesium fluoride substrate refractive index is 1.3 ~ 1.4.
5. the Graphene according to claim 1 or 4-full photomodulator of micro-nano fiber composite structure, is characterized in that described magnesium fluoride substrate refractive index is 1.37.
6. Graphene according to claim 1-full photomodulator of micro-nano fiber composite structure, is characterized in that described micro-nano fiber diameter is 0.1 ~ 2 μm.
7. Graphene according to claim 1-full photomodulator of micro-nano fiber composite structure, the graphene film covered described in it is characterized in that on micro-nano fiber is individual layer.
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Cited By (6)
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| CN108388061A (en) * | 2018-03-05 | 2018-08-10 | 北京大学 | Full optical modulator and its modulator approach based on graphene optical waveguide |
| CN109449735A (en) * | 2018-12-24 | 2019-03-08 | 重庆邮电大学 | A kind of mixed mode-locking thulium-doped fiber laser |
| CN110987227A (en) * | 2019-12-12 | 2020-04-10 | 燕山大学 | Temperature sensor based on graphene micro-nano optical fiber and preparation method thereof |
| CN110989208A (en) * | 2019-12-31 | 2020-04-10 | 燕山大学 | All-optical modulator and preparation method thereof |
| CN111123559A (en) * | 2019-11-05 | 2020-05-08 | 北京理工大学 | Based on Bi4Br4Infrared all-optical modulation device |
| CN112615240A (en) * | 2020-12-03 | 2021-04-06 | 重庆邮电大学 | Device and method for generating multi-pulse fiber laser |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388061A (en) * | 2018-03-05 | 2018-08-10 | 北京大学 | Full optical modulator and its modulator approach based on graphene optical waveguide |
| CN108388061B (en) * | 2018-03-05 | 2020-06-02 | 北京大学 | All-optical modulator based on graphene optical waveguide and modulation method thereof |
| CN109449735A (en) * | 2018-12-24 | 2019-03-08 | 重庆邮电大学 | A kind of mixed mode-locking thulium-doped fiber laser |
| CN111123559A (en) * | 2019-11-05 | 2020-05-08 | 北京理工大学 | Based on Bi4Br4Infrared all-optical modulation device |
| CN111123559B (en) * | 2019-11-05 | 2021-02-23 | 北京理工大学 | Based on Bi4Br4Infrared all-optical modulation device |
| CN110987227A (en) * | 2019-12-12 | 2020-04-10 | 燕山大学 | Temperature sensor based on graphene micro-nano optical fiber and preparation method thereof |
| CN110989208A (en) * | 2019-12-31 | 2020-04-10 | 燕山大学 | All-optical modulator and preparation method thereof |
| CN110989208B (en) * | 2019-12-31 | 2021-07-30 | 燕山大学 | All-optical modulator and preparation method thereof |
| CN112615240A (en) * | 2020-12-03 | 2021-04-06 | 重庆邮电大学 | Device and method for generating multi-pulse fiber laser |
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