CN108152890A - A kind of add-drop multiplexer of the Wavelength tunable based on graphene grating - Google Patents
A kind of add-drop multiplexer of the Wavelength tunable based on graphene grating Download PDFInfo
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- CN108152890A CN108152890A CN201711429220.6A CN201711429220A CN108152890A CN 108152890 A CN108152890 A CN 108152890A CN 201711429220 A CN201711429220 A CN 201711429220A CN 108152890 A CN108152890 A CN 108152890A
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- graphene
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- signal
- drop multiplexer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
- G02B6/29325—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide of the slab or planar or plate like form, i.e. confinement in a single transverse dimension only
- G02B6/29328—Diffractive elements operating in reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
- G02B6/29383—Adding and dropping
Abstract
The invention discloses a kind of add-drop multiplexers of the Wavelength tunable based on graphene grating, including substrate, signal input part, signal output end, signal, which are provided with, above the substrate uploads end, signal downloading end and single mode waveguide MZI structures, the single mode waveguide MZI structures include the graphene waveguide optical grating on directional coupler and both arms, the directional coupler coordinates with signal input part and signal downloading end, and the directional coupler coordinates with signal input part and signal downloading end；The graphene waveguide optical grating is connect respectively with electrode；By the use of graphene as electrooptical material, the defects of bifurcated multiplexer effect wavelength can be regulated and controled with electric light, traditional single wavelength add-drop multiplexer wavelength can be overcome to fix, it can need to change at any time road wavelength up and down according to actual conditions.
Description
Technical field
The invention belongs to optoelectronic device technology fields, and in particular to a kind of point of Wavelength tunable based on graphene grating
Insert multiplexer.
Background technology
Optical add/drop multiplexer (OADM) is one of Primary Component in wavelength-division multiplex system, and function is by more waves of input
A certain wavelength signals in long signal, which are downloaded in branch's light path, realizes signal extraction, in addition can also load a certain wavelength signals
Into multi-wavelength output light path, uploading for signal is realized, and other unrelated signals pass through bifurcated multiplexer by impregnable.
Traditional add-drop multiplexer can only all realize that fixed single waveguide length is uploaded, downloaded, to realize point of multi-wavelength
The shortcomings that slotting multiplexing can only be realized by the array of device, and this mode realizes multi-wavelength add drop multiplex is entire device junction
Structure size is big, high energy consumption, and the tuning control of bifurcated multiplexer is slow.Other realizes the tunable scheme of wavelength bifurcated multiplexer
Including being regulated and controled based on the temperature of grating or MZI structures, piezoelectric stress regulation and control and microcomputer electric control.These modes have
The shortcomings that common, corresponding speed was difficult reply complicated dense wave division multipurpose signal at a high speed slowly, in stability and integration
Aspect lacks advantage.
Invention content
It is an object of the invention to：A kind of add-drop multiplexer of the Wavelength tunable based on graphene grating is provided, is solved
The technical issues of existing add-drop multiplexer effect wavelength is single, and device architecture complexity is huge, and regulation and control speed is slow, and stability is poor.
The technical solution adopted by the present invention is as follows：
A kind of add-drop multiplexer of the Wavelength tunable based on graphene grating including substrate, is provided with above the substrate
Signal input part, signal output end, signal upload end, signal downloading end and single mode waveguide MZI structures, the single mode waveguide MZI
Structure includes the graphene waveguide optical grating on directional coupler and both arms, the directional coupler and signal input part and signal
Downloading end coordinates, and the directional coupler coordinates with signal input part and signal downloading end；The graphene waveguide optical grating difference
It is connect with electrode.
Further, the graphene waveguide optical grating includes bar shaped straight wave guide, and the bar shaped straight wave guide surface is laid with successively
First layer graphene layer, spacer medium layer and second layer graphene layer, the first layer graphene layer, spacer medium layer and second
Layer graphene layer is periodically laid with along bar shaped straight wave guide direction and forms optical grating construction.
Further, first graphene layer and second layer graphene layer are laid with to both sides extension to electrode respectively.
Further, the first layer graphene layer and second layer graphene layer are the two dimension that atomic thickness is less than 4 layers
Grapheme material.
Further, the spacer medium layer is one or more of Si oxide, silicon nitrogen oxides or boron nitride.
Further, the material of the electrode is one or more of gold, silver, platinum or copper.
Further, the substrate material is silica.
Further, the directional coupler is 3dB directional couplers.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, due to using silica-based waveguides structure, there is compatibility well with CMOS technology, it is easy to process, convenient for integrated；
More compact structure, device size smaller, performance are stablized.
2nd, by the use of graphene as electrooptical material, bifurcated multiplexer effect wavelength can be regulated and controled with electric light, can be overcome traditional single
The defects of one wavelength add-drop multiplexer wavelength is fixed can need to change at any time according to actual conditions road wavelength up and down.
3rd, grapheme material has very high carrier mobility, conducts electricity very well, and with traditional mechanical adjustment, heat is adjusted
Section, piezoelectricity adjust the speed of response for comparing and having and being exceedingly fast, and tuning sensitivity is high.
Description of the drawings
The present invention will illustrate by example and with reference to the appended drawing, wherein：
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the schematic top plan view of the present invention；
Fig. 3 is the end structure illustration of both arms graphene waveguide optical grating；
Fig. 4 is the overlooking the structure diagram of both arms graphene waveguide optical grating；
Fig. 5 be the high low refractive index dielectric refringence of both arms graphene waveguide optical grating be 0.5 when reflectance spectrum figure；
It is marked in figure：1- substrates, 2,6- directional couplers, 31,32,5- electrodes, 41,42- graphene gratings, 7- signals are defeated
Entering end, 8- signal downloading ends, No. 9- is uploaded end, 10- signal output ends, and 11, the first layer graphenes of 15-, 12,16- second layer stones
Black alkene, 13,17- spacer mediums, 14,18- bar shaped straight wave guides.
Specific embodiment
All features or disclosed all methods disclosed in this specification or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
1-5 elaborates to the present invention below in conjunction with the accompanying drawings.
Specific embodiment 1
A kind of add-drop multiplexer of the Wavelength tunable based on graphene grating including substrate, is provided with above the substrate
Signal input part, signal output end, signal upload end, signal downloading end and single mode waveguide MZI structures, the single mode waveguide MZI
Structure includes directional coupler 2, directional coupler 6, the graphene waveguide optical grating 41 on both arms and graphene waveguide optical grating 42,
The directional coupler 2 coordinates with signal input part 7 and signal downloading end 8, and the directional coupler 6 and signal are defeated
Enter end 9 and signal downloading end 10 coordinates；
41 both sides of graphene waveguide optical grating set electrode 5 and electrode 31,42 both sides of graphene waveguide optical grating setting, 5 He of electrode
Electrode 32.
The graphene waveguide optical grating 41 includes bar shaped straight wave guide 14, and the graphene waveguide optical grating 42 includes the straight wave of bar shaped
18 are led, 14 surface of bar shaped straight wave guide is laid with first layer graphene layer 11,13 and second layer graphene of spacer medium layer successively
Layer 12, first graphene layer 11 is laid with to the extension of 5 direction of electrode and connection electrode 5, and second layer graphene layer 12 is to electrode
The extension of 31 directions is laid with and connection electrode 31；The first layer graphene layer 11 and second layer graphene layer 12 are atomic thickness
Two-dimensional graphene material less than 4 layers；12 edge of the first layer graphene layer 11, spacer medium layer 13 and second layer graphene layer
14 direction of bar shaped straight wave guide is periodically laid with and forms optical grating construction；The core material of bar shaped straight wave guide 14 is silicon materials.
18 surface of bar shaped straight wave guide is laid with first layer graphene layer 15, spacer medium layer 17 and second layer graphite successively
Alkene layer 16, first graphene layer 15 is laid with to the extension of 5 direction of electrode and connection electrode 5, and second layer graphene layer 16 is to electricity
The extension of 32 direction of pole is laid with and connection electrode 32；The first layer graphene layer 15 and second layer graphene layer 16 are atom thick
Two-dimensional graphene material of the degree less than 4 layers；The first layer graphene layer 15, spacer medium layer 17 and second layer graphene layer 16
It is periodically laid with along 18 direction of bar shaped straight wave guide and forms optical grating construction；The core material of bar shaped straight wave guide 18 is silicon materials.
The spacer medium layer 13 and spacer medium layer 17 are one in Si oxide, silicon nitrogen oxides or boron nitride
Kind is several.
The electrode 5, electrode 31, electrode 32 material one or more of for gold, silver, platinum or copper.
The substrate material 1 is low refractive index silica.
The directional coupler 2 and directional coupler 6 are 3dB directional couplers；Core material is silicon materials.
Specific embodiment 2
The material of the present embodiment substrate 1 is silica, thickness 1um；Bar shaped straight wave guide 14 and bar shaped straight wave guide 18
Material is silicon, and end face is the square of w=0.4 μm of the length of side；First layer graphene 11, the first layer graphene 15, second layer stone
Black 12 and second layer graphene 16 of alkene is monoatomic layer graphene, thickness 0.7nm, electrode 5, electrode 31, electrode 32 material
Material is gold, and electrode 31 and electrode 32 form first electrode, and electrode 5 is second electrode, and first electrode and second electrode are external partially
Shake voltage；The material of spacer medium layer 13 and spacer medium layer 17 is hexagonal boron nitride hBN, thickness 50nm；3dB orients coupling
Clutch 2 and the coupling spacing of directional coupler 6 are 0.4 μm, and coupling length is 50 μm；Graphene waveguide optical grating 41 and graphite
Parameter Λ=1.603 μm of alkene waveguide optical grating 42, a=1 μm, b=0.603 μm, 30 μm of total length.
The present invention is using the adjustable characteristic of graphene refractive index, point for the Wavelength tunable based on graphene grating designed
Insert multiplexer has the advantages that compact-sized, performance is stablized, of low cost, and tuned speed is fast, high sensitivity.These are good
Performance is suitable for the fields such as wavelength-division multiplex system, signal processing, the integrated optics of optic communication, has very high use value.
The present invention operation principle be：Signal input part 7 inputs the signal λ of multiple wavelength1λ2...λn-1λn, by 3dB couplings
Clutch 2 distributes signal equal strength in two straight-arm bar shaped straight wave guides, since two straight-arm bar shaped straight wave guides are periodically equipped with graphite
Alkene, waveguide will form Bragg-grating structure, multi-wavelength signals λ1λ2...λn-1λnIt, can be because of Bradley during by Bragg grating
Lattice reflect and reflect the specific wavelength for the condition that meets, and can change bragg reflection wavelength by adjusting the refractive index of graphene
λi, wavelength λiSignal reflex go back, can be coupled to signal downloading end 8 by three-dB coupler 2, realize λiUnder wavelength signals
It carries, the flashlight that residue is unsatisfactory for Bragg's condition of reflection will pass through second three-dB coupler 6, be coupled into signal output end
10, continue onwards transmission；Similarly, 9 input λ of end is uploaded in signaljWavelength signals divide signal equal strength by three-dB coupler 6
With in two straight-arm bar shaped straight wave guides, by suitably adjusting the bias voltage of graphene, the graphene Waveguide on both arms can be made
Grid are to λjIt is reflected, and signal output end 10 is coupled into from three-dB coupler 6.So as to be biased by adjusting graphene
Voltage changes graphene refractive index, realizes and different wave length signal is uploaded or downloaded on same bifurcation multiplex apparatus, is i.e. wavelength
Tunable add drop multiplex.
Claims (8)
1. a kind of add-drop multiplexer of the Wavelength tunable based on graphene grating including substrate (1), is set above the substrate (1)
It is equipped with signal input part (7), signal output end (10), signal and uploads end (9), signal downloading end (8) and single mode waveguide MZI knots
Structure, it is characterised in that：The single mode waveguide MZI structures include the graphene Waveguide on directional coupler (2,6) and both arms
Grid (41,42), the directional coupler (2) coordinate with signal input part (7) and signal downloading end (8), the directional coupler
(6) coordinate with signal input part (9) and signal downloading end (10)；The graphene waveguide optical grating (41,42) respectively with electrode (5,
31st, 32) it connects.
2. a kind of add-drop multiplexer of Wavelength tunable based on graphene grating according to claim 1, it is characterised in that：
The graphene waveguide optical grating (41,42) includes bar shaped straight wave guide (14,18), and surface is successively for the bar shaped straight wave guide (14,18)
It is laid with first layer graphene layer (11,15), spacer medium layer (13,17) and second layer graphene layer (12,16), the first layer
Graphene layer (11,15), spacer medium layer (13,17) and second layer graphene layer (12,16) are square along bar shaped straight wave guide (14,18)
Optical grating construction is formed to periodically laying.
3. a kind of wave 2 based on graphene grating according to claim 2 grows adjustable add-drop multiplexer, feature exists
In：First graphene layer (11,15) and second layer graphene layer (12,16) respectively to both sides extension be laid with to electrode (5,
31、32)。
4. a kind of add-drop multiplexer of Wavelength tunable based on graphene grating according to claim 2, it is characterised in that：
The first layer graphene layer (11,15) and second layer graphene layer (12,16) are the two-dimentional graphite that atomic thickness is less than 4 layers
Alkene material.
5. a kind of add-drop multiplexer of Wavelength tunable based on graphene grating according to claim 2, it is characterised in that：
The spacer medium layer (13,17) is one or more of Si oxide, silicon nitrogen oxides or boron nitride.
6. a kind of add-drop multiplexer of Wavelength tunable based on graphene grating according to claim 1, it is characterised in that：
The material of the electrode (5,31,32) is one or more of gold, silver, platinum or copper.
7. a kind of add-drop multiplexer of Wavelength tunable based on graphene grating according to claim 1, it is characterised in that：
Substrate (1) material is silica.
8. a kind of add-drop multiplexer of Wavelength tunable based on graphene grating according to claim 1, it is characterised in that：
The directional coupler (2,6) is 3dB directional couplers.
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| CN108152890B CN108152890B (en) | 2019-09-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111752016A (en) * | 2020-08-14 | 2020-10-09 | 东南大学 | Broadband integrated three-way wavelength division multiplexer |
| CN113917604A (en) * | 2020-07-07 | 2022-01-11 | 格芯(美国)集成电路科技有限公司 | Tunable grating coupler containing material with variable refractive index |
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| CN1764096A (en) * | 2005-10-26 | 2006-04-26 | 中山大学 | Optical add-drop multiplexer with adjustable wave length channel |
| US20130071083A1 (en) * | 2011-09-21 | 2013-03-21 | Electronics And Telecommunications Research Institute | Optical waveguide |
| CN103941345A (en) * | 2014-05-06 | 2014-07-23 | 苏州大学 | Two-dimensional stratified material based SOI (Semicon-on-insulator) base micro loop filter |
| CN104393926A (en) * | 2014-11-11 | 2015-03-04 | 浙江大学 | Transmitter module for mode multiplexing-wavelength division multiplexing |
| CN106501970A (en) * | 2016-12-19 | 2017-03-15 | 电子科技大学 | A kind of tunable waveguide optical grating based on silicon waveguide Graphene |
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2017
- 2017-12-25 CN CN201711429220.6A patent/CN108152890B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1764096A (en) * | 2005-10-26 | 2006-04-26 | 中山大学 | Optical add-drop multiplexer with adjustable wave length channel |
| US20130071083A1 (en) * | 2011-09-21 | 2013-03-21 | Electronics And Telecommunications Research Institute | Optical waveguide |
| CN103941345A (en) * | 2014-05-06 | 2014-07-23 | 苏州大学 | Two-dimensional stratified material based SOI (Semicon-on-insulator) base micro loop filter |
| CN104393926A (en) * | 2014-11-11 | 2015-03-04 | 浙江大学 | Transmitter module for mode multiplexing-wavelength division multiplexing |
| CN106501970A (en) * | 2016-12-19 | 2017-03-15 | 电子科技大学 | A kind of tunable waveguide optical grating based on silicon waveguide Graphene |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917604A (en) * | 2020-07-07 | 2022-01-11 | 格芯(美国)集成电路科技有限公司 | Tunable grating coupler containing material with variable refractive index |
| CN113917604B (en) * | 2020-07-07 | 2023-12-19 | 格芯(美国)集成电路科技有限公司 | Tunable grating coupler containing material with variable refractive index |
| CN111752016A (en) * | 2020-08-14 | 2020-10-09 | 东南大学 | Broadband integrated three-way wavelength division multiplexer |
| CN111752016B (en) * | 2020-08-14 | 2022-04-22 | 东南大学 | Broadband integrated three-way wavelength division multiplexer |
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