CN106526902A - Light space ultrafast modulator based on graphene micro optical fiber - Google Patents
Light space ultrafast modulator based on graphene micro optical fiber Download PDFInfo
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- CN106526902A CN106526902A CN201611004639.2A CN201611004639A CN106526902A CN 106526902 A CN106526902 A CN 106526902A CN 201611004639 A CN201611004639 A CN 201611004639A CN 106526902 A CN106526902 A CN 106526902A
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- ultrafast
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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
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass
- G02F1/0115—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass in optical fibres
-
- 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
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a light space ultrafast modulator based on a graphene micro optical fiber and relates to the field of full light ultrafast modulators. The light space ultrafast modulator comprises a flat substrate, a graphene layer, the micro optical fiber and a pumping light source. The graphene layer is arranged on the flat substrate, the micro optical fiber is arranged on the graphene layer in a wound mode, and the pumping light source is arranged above the micro optical fiber. Spatial pumping light, containing a modulating signal, generated by the pumping light source irradiates the graphene layer. An ultrafast signal needing to be loaded is edited into the spatial pumping light, and the spatial pumping light irradiates the graphene layer. Switching of short-time-duration spatial pumping light and long-time-duration full light is achieved at low frequency, the ultra high-speed modulation signal is loaded on carrier waves, and the ultrafast modulation effect is generated. By loading different pieces of spatial pumping light, loading of any ultrafast signal can be achieved.
Description
Technical field
The invention belongs to optical fiber communication devices field, the more particularly to ultrafast tune in light space based on Graphene tiny fiber-optics
Device processed.
Background technology
Optical modulator is the Primary Component in optical communication system, and modulated signal is mixed and carried to carrier operation by optical modulator
The amplitude of ripple, phase place or polarization, realize signal loading.Light modulation main at present is divided into full light modulation and Electro-optical Modulation.Use
The topmost problem of electric signal load information is that electronic bottleneck can limit modulating speed, and Electro-optical Modulation speed most fast at present is also only
In hundred Ghz or so, modulating speed is big more than the electrooptic modulator manufacture difficulty of Ghz magnitudes, expensive.Full light modulation can be
Carry out in optical fiber or other fiber waveguides, the signal loading in ultrafast, low-loss and broadband can be realized in easy structure.
Graphene is with sp by carbon atom2Hybridized orbit two nitrogen-atoms layers of the composition regular hexagon in honeycomb crystal lattice are put down
Faceted crystal film, dirac cone band structure make it have various peculiar and prominent photoelectric properties (saturated absorption and ultrafast load
Flow sub- transition and relaxation process etc.).Based on the optical modulator of these characteristics, ultrafast mode-locked laser, photodetector, polarization control
Device processed, optical limiter and photovoltaic device, transparency electrode and conductive film are by experimental demonstration or commercialization.Wherein, it is based on
The optical modulator of Graphene presents the incomparable advantage of other materials modulator in terms of modulating speed, while also taking into account collection
Become second nature, the factor of the aspect such as modulation depth, modulation bandwidth and power consumption.Zhang Xiang from University of California Berkeley in 2011 et al.
Since realizing Graphene Electro-optical Modulation first, the simulation calculation of a large amount of graphene electro-optical modulators and experiment are reported, and become
It is currently based on the Main way of Graphene modulation research.But the parasitic capacitance of these modulators makes electronic loop equivalent to a RC
Low pass filter (3dB electric signal cut-off frequency f=1/2 π RC), in making experiment, highest modulation rate cannot break through tens Ghz
Magnitude, far below the result (hundreds of Ghz) of simulation calculation.
Electronic bottleneck is got around based on the full light modulation of Graphene saturated absorption, it is possible to achieve ultrafast modulation rate is (real
Test demonstration 200Ghz, theory analysis 500Ghz).Graphene can be controlled to passing through through the high-frequency high-power pump light of Graphene
The absorption of its low frequency signal light, so as to realize the full light amplitude modulation to carrier wave, while the ultrafast carrier relaxation of Graphene
Speed allows the speed of this modulation very fast (hundreds of fs to several ps).Ultra-wide wavelength modulation range, big modulation depth are low
Power consumption and high area efficiency are also the advantage that Graphene gives full light modulation.Optical fiber is combined as waveguiding structure with Graphene and
Can make modulator that there is optical fiber：Modulator is compatible with existing fiber communication system, couples with extremely low input and output
Loss；Light can be transmitted with basic mode in a fiber, with extremely low loss；The theoretical ripe, performance of optical fiber structure is clear, kind
Class is various, and beneficial to being combined the modulator of designing various function admirables with Graphene, the Li Wei of Zhejiang University is in 2014 in reality
Test room and demonstrate full optical modulator of the first item based on Graphene optical fiber.
It should be noted that existing modulator is all by the way of the modulation of spatially single-point, what is so produced is modulated
The speed of signal is equal to modulated signal speed, is accomplished by superfast tune when needing and the signal of ultra-high frequency being loaded in carrier wave
Signal processed, and the photosystem for producing the high speed circuit and generation Superhigh repetition rate light pulse sequence of ultrafast electric signal is all difficult to
Make, and costliness.Optical Time Division Multiplexing is a kind of effective way for producing high speed signal, but optical time division multiplexer is to system
Make required precision very high, and it is temperature sensitive, while itself needing very narrow pulsed light as light source.By high repetition frequency
Modulated signal spatially disassemble modulated signal for many low-repetition-frequencies, loaded in the diverse location of fiber waveguide simultaneously,
The different spaces part of carrier wave is carried out while modulating the effect that can equally obtain High Speed Modulation, this method is by of the invention first
Secondary proposition, referred to as spatial modulation.
The content of the invention
For defect present in prior art, the present invention proposes the ultrafast tune in light space based on Graphene tiny fiber-optics
Device processed, it is therefore intended that realize the flexible loading and ultrafast loading of information in full area of light.
To reach object above, the present invention is adopted the technical scheme that：
A kind of light space ultrafast modulation device based on Graphene tiny fiber-optics, including：It is planar substrates 1, graphene layer 2, micro-
Thin optic fibre 3 and pump light source 4；The graphene layer 2 is arranged in planar substrates 1, and the tiny fiber-optics 3 are arranged with rolled form
On graphene layer 2, the pump light source 4 is arranged at the top of the tiny fiber-optics 3；
The space pump light for including modulated signal that the pump light source 4 is produced is radiated on graphene layer 2.
On the basis of such scheme, the number of plies of the graphene layer 2 is less than 10 layers.
On the basis of such scheme, a diameter of 1～20 micron of the tiny fiber-optics 3, the coiling bending of tiny fiber-optics 3
The corresponding value of radius avoids bending loss.
On the basis of such scheme, the space pump light containing modulated signal that the pump light source 4 is produced can be adjusted
Section.
On the basis of such scheme, the spatial resolution of the space pump light that the pump light source 4 is produced is at hundred microns
Magnitude.
The light space ultrafast modulation device through above-mentioned setting, by the shape for changing space pump light with lower frequency, can
So that arbitrary modulated signal is loaded on carrier wave.
Beneficial effects of the present invention：
(1) the information load mode of the message form and spatial modulation of space pump light is combined, changes traditional list
Point modulation system, allows bulk information to load in synchronization, reduces the speed of actual loaded control, solves single-point tune
When processed, ultrafast signal source is difficult to the problem for obtaining (such as the electronic bottleneck in Electro-optical Modulation).
(2) signal for loading be in the form of the pump light of space, can be with by the shape of adjustment space pump light
Modulation to each information load(ing) point is realized once, it is very convenient flexible.
(3) cascaded structure of modulator is easy to make, can be with the combination of each low-rate modulation point signal of precise control.
(4) modulator is insensitive to use environment.
(5) full light modulation, without the need for complicated electrode design and making, while having got around limit of the electronic bottleneck to modulating speed
System.
(6) Graphene as modulation material, with ultrashort response time, ultra-wide wavelength modulation range, low-power consumption and high face
The advantage of product efficiency.
(7) tiny fiber-optics are as basic waveguide, compatible with existing fiber communication system, couple with extremely low input and output
Loss；Carrier wave is transmitted with basic mode in a fiber, with extremely low loss.
Description of the drawings
The present invention has drawings described below：
Light space ultrafast modulation device structural representations of the Fig. 1 based on Graphene tiny fiber-optics.
The plane domain of Fig. 2 planar substrates divides figure.
Projection distribution map of the space pump light in Fig. 3 examples one on graphene layer.
Projection distribution map of the space pump light in Fig. 4 examples two on graphene layer.
Space pump light in Fig. 5 examples one is with full light state with time-switching schematic diagram.
Ultrafast modulation design sketch in Fig. 6 examples one.
In Fig. 7 examples two space pump light with full light state with time-switching schematic diagram.
Ultrafast modulation design sketch in Fig. 8 examples two.
In figure：1st, planar substrates；2nd, graphene layer；3rd, tiny fiber-optics；4th, pump light source.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
A kind of light space ultrafast modulation device based on Graphene tiny fiber-optics, including：It is planar substrates 1, graphene layer 2, micro-
Thin optic fibre 3 and pump light source 4；The graphene layer 2 is arranged in planar substrates 1, and the tiny fiber-optics 3 are arranged with rolled form
On graphene layer 2, the pump light source 4 is arranged at the top of the tiny fiber-optics 3；
The space pump light for including modulated signal that the pump light source 4 is produced is radiated on graphene layer 2.
On the basis of such scheme, the number of plies of the graphene layer 2 is less than 10 layers.
On the basis of such scheme, a diameter of 1～20 micron of the tiny fiber-optics 3, the coiling bending of tiny fiber-optics 3
The corresponding value of radius avoids bending loss.
On the basis of such scheme, the space pump light containing modulated signal that the pump light source 4 is produced can be adjusted
Section.
On the basis of such scheme, the spatial resolution of the space pump light that the pump light source 4 is produced is at hundred microns
Magnitude.
Its general principles：Tiny fiber-optics have strong evanscent field, carrier wave is diffused in graphene layer and receives tune
System.Space pump light is radiated on graphene layer, adjusts absorption of the Graphene to carrier wave using Graphene saturated absorption characteristic.Adjust
Signal processed in the form of the space pump light for changing simply and flexibly can control to add by changing space pump light
The information of load.Space pump light makes the absorption characteristic of Graphene in the distribution that identical pattern is axially formed along tiny fiber-optics, to carrying
Ripple carries out adjustable multiposition absorption (absorption position is 0 signal, does not absorb position for 1 signal).The ultrashort carrier of Graphene
Relaxation time allows the space width of single absorption position very narrow while not sacrificing modulation depth, therefore fine and closely woven space pumping
Light can produce the modulated signal of VHD, also reduce the overall dimensions of device.Large-sized space pump light can be same
One time point loads bulk information come the pace of change of the space pump light needed for reducing, so as to realize with very low modulating speed
The signal modulation of VHD, reaches the effect of ultrafast modulation.
Embodiment one
The modulator includes planar substrates 1, graphene layer 2, tiny fiber-optics 3 and pump light source 4, as shown in Figure 1.Combination side
Formula is：Graphene layer 2 is arranged in planar substrates 1, and tiny fiber-optics 3 are arranged on graphene layer 2 with rolled form, pump light source
4 tops for being arranged at the tiny fiber-optics 3, the space pump light for including modulated signal that pump light source 4 is produced are radiated at stone
On black alkene layer 2.A diameter of 8 μm of tiny fiber-optics 3, the coiling bending radius of tiny fiber-optics 3 is 50um, by the flat of planar substrates 1
According to region division is carried out shown in Fig. 2, in Fig. 2, each blockage is a unit in face, and waveguiding structure therein is connected,
Form cascaded structure.The partial-length of the tiny fiber-optics 3 in each zonule is made to be 600 μm, the size of whole planar substrates 1
For 7mm × 1mm.The number of plies of graphene layer used 2 is 1.Carrier wave is passed through from one end of tiny fiber-optics 3, is exported in other end detection
Through the signal modulated.Modulated signal [0 00000 ... 00000 0] is showed in the form of the pump light of space,
Space pump light is incident upon on the surface of planar substrates 1, space pump light is with the zonule of the division shown in Fig. 2 as list
Unit, makes 1 surface of planar substrates produce light and shade distribution as shown in Figure 3, and the black square in Fig. 3 is that, without pumping optical position, white square is pump
Pu light irradiation position.Space pump light is periodically switched with full light (all being illuminated by pump light on the surface of planar substrates 1)：
The space pump light of 2ps is alternately present (as shown in Figure 5) with the full light of 140ps, it is known that control frequency for 7Ghz.Tiny fiber-optics 3
The available time waveform with modulated signal [0 00000 ... 00000 0] corresponding modulated signal of output end,
As shown in fig. 6, repetition rate is 250Ghz, i.e. modulating frequency.
Embodiment two：
The modulator includes planar substrates 1, graphene layer 2, tiny fiber-optics 3 and pump light source 4, as shown in Figure 1.Combination side
Formula is：Graphene layer 2 is arranged in planar substrates 1, and tiny fiber-optics 3 are arranged on graphene layer 2 with rolled form, pump light source
4 tops for being arranged at the tiny fiber-optics 3, the space pump light for including modulated signal that pump light source 4 is produced are radiated at stone
On black alkene layer 2.A diameter of 1 μm of tiny fiber-optics 3, the coiling bending radius of tiny fiber-optics 3 is 10um, by the flat of planar substrates 1
According to region division is carried out shown in Fig. 2, in Fig. 2, each blockage is a unit in face, and waveguiding structure therein is connected,
Form cascaded structure.The partial-length of the tiny fiber-optics 3 in each zonule is made to be 120 μm, the size of whole planar substrates 1
For 1.4mm × 0.2mm.The number of plies of graphene layer used 2 is 5.Carrier wave is passed through from one end of tiny fiber-optics 3, is detected in the other end
Signal of the output through modulation.By modulated signal [0 1001100011101001100011
1 ... 01001100011 1] showed in the form of the pump light of space, space pump light is incident upon into flat board base
On the surface at bottom 1, space pump light makes the surface of planar substrates 1 produce such as with the zonule of the division shown in Fig. 2 as unit
Light and shade distribution shown in Fig. 4, in Fig. 4, black square is that, without pumping optical position, white square is pumping light irradiation position.By space pump light with
Full light (all being illuminated by pump light on the surface of planar substrates 1) periodically switches：The space pump light of 0.4ps and the full light of 28ps
Be alternately present (as shown in Figure 7), it is known that frequency is controlled for 35Ghz.The output end of tiny fiber-optics 3 is obtained and modulated signal [0 1
0011000111010011000111 ... 01001100011 1] it is corresponding
The time waveform of modulated signal, as shown in figure 8, repetition rate is 1250Ghz, i.e. modulating frequency.
The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (5)
1. a kind of light space ultrafast modulation device based on Graphene tiny fiber-optics, it is characterised in that include：Planar substrates (1), stone
Black alkene layer (2), tiny fiber-optics (3) and pump light source (4)；The graphene layer (2) is arranged in planar substrates (1), described micro-
Thin optic fibre (3) is arranged on graphene layer (2) with rolled form, and the pump light source (4) is arranged at the tiny fiber-optics (3)
Top；The space pump light for including modulated signal that the pump light source (4) produces is radiated on graphene layer (2).
2. the light space ultrafast modulation device based on Graphene tiny fiber-optics as claimed in claim 1, it is characterised in that the stone
The number of plies of black alkene layer (2) is less than 10 layers.
3. the light space ultrafast modulation device based on Graphene tiny fiber-optics as claimed in claim 1, it is characterised in that described micro-
A diameter of 1～20 micron of thin optic fibre (3).
4. the light space ultrafast modulation device based on Graphene tiny fiber-optics as claimed in claim 1, it is characterised in that the pump
The space pump light containing modulated signal that Pu light source (4) is produced can be adjusted.
5. the light space ultrafast modulation device based on Graphene tiny fiber-optics as claimed in claim 1, it is characterised in that the pump
The spatial resolution of the space pump light that Pu light source (4) is produced is in hundred micron dimensions.
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| CN201611004639.2A CN106526902A (en) | 2016-11-15 | 2016-11-15 | Light space ultrafast modulator based on graphene micro optical fiber |
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| CN201611004639.2A CN106526902A (en) | 2016-11-15 | 2016-11-15 | Light space ultrafast modulator based on graphene micro optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363222A (en) * | 2018-01-16 | 2018-08-03 | 四川大学 | A kind of full light modulation three terminal device of orthogonal space |
| CN110989208A (en) * | 2019-12-31 | 2020-04-10 | 燕山大学 | All-optical modulator and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197486A (en) * | 2013-04-09 | 2013-07-10 | 中国电子科技集团公司第十三研究所 | Terahertz modulation amplifier based on graphene waveguide structure |
| CN203444187U (en) * | 2013-08-20 | 2014-02-19 | 中国工程物理研究院流体物理研究所 | Full-light-controlled terahertz intensity modulator and terahertz intensity modulator |
-
2016
- 2016-11-15 CN CN201611004639.2A patent/CN106526902A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197486A (en) * | 2013-04-09 | 2013-07-10 | 中国电子科技集团公司第十三研究所 | Terahertz modulation amplifier based on graphene waveguide structure |
| CN203444187U (en) * | 2013-08-20 | 2014-02-19 | 中国工程物理研究院流体物理研究所 | Full-light-controlled terahertz intensity modulator and terahertz intensity modulator |
Non-Patent Citations (1)
| Title |
|---|
| ZHI-BO LIU 等: "Broadband all-optical modulation using a graphene-covered-microfiber", 《LASER PHYSICS LETTERS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363222A (en) * | 2018-01-16 | 2018-08-03 | 四川大学 | A kind of full light modulation three terminal device of orthogonal space |
| 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 |
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