CN111650694A - Wavelength division multiplexer based on three-core graphene optical fiber - Google Patents
Wavelength division multiplexer based on three-core graphene optical fiber Download PDFInfo
- Publication number
- CN111650694A CN111650694A CN202010508562.2A CN202010508562A CN111650694A CN 111650694 A CN111650694 A CN 111650694A CN 202010508562 A CN202010508562 A CN 202010508562A CN 111650694 A CN111650694 A CN 111650694A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- graphene
- core
- core optical
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 57
- 239000013307 optical fiber Substances 0.000 title claims abstract description 56
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 230000007704 transition Effects 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 19
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 229920006335 epoxy glue Polymers 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 8
- 238000004891 communication Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 26
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 5
- 239000004038 photonic crystal Substances 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G02B6/29331—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 evanescent wave coupling
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides a wavelength division multiplexer based on a graphene three-core optical fiber. The method is characterized in that: the optical fiber cable is composed of a V-shaped groove 1, epoxy glue 2, a three-core optical fiber 3, a metal electrode 4, an H-BN transition layer 5 and a graphene layer 6. Specifically, side polishing is carried out on the middle part of a section of three-core optical fiber, graphene 6 and an H-BN transition layer 5 are deposited in a side polishing area, and a metal electrode 4 is prepared. The effective refractive indexes of the graphene are changed under the action of the external voltage of the metal electrode 4, so that the refractive indexes of the three fiber cores in the optical fiber are changed, and the transmission constants of the middle core and the left and right cores at different wavelengths are matched by adjusting the input of the external voltage, so that the separation of light waves with different wavelengths at the emergent end is realized. The invention can be widely applied to the fields of optical communication, integrated optics and the like.
Description
(I) technical field
The invention relates to a wavelength division multiplexer based on a graphene three-core optical fiber, which can be used for optical fiber communication and optical fiber integration and belongs to the technical field of integrated optical devices.
(II) background of the invention
Wavelength division multiplexers are an important class of passive devices in optical communication systems, which affect the performance of the overall system. The functions of selecting the optical wavelength between the two fiber cores, separating different polarization states and the like are realized through mode field coupling between the two adjacent fiber cores. According to different manufacturing methods, wavelength division multiplexers can be classified into a fused-cone fiber type, a dielectric film interference type, a grating type, a waveguide type, and the like.
With the continuous development of optical fiber technology, optical fibers of various novel structures are emerging continuously, and multi-core optical fibers such as double-core, three-core, four-core, six-core and the like are appeared. The multicore fiber can realize multiple selection functions of optical power, wavelength, mode, polarization state and the like by utilizing the coupling effect of evanescent fields of light among fiber cores. Compared with the conventional optical fiber, the special structure of the multi-core optical fiber can be utilized to manufacture new devices such as an optical fiber laser, an optical fiber filter, an optical switch, an image amplifier, a special optical field generator and the like.
In recent years, researchers have proposed various methods and mechanisms to implement photonic crystal wavelength division multiplexers. In 2012, dynasty forest and the like designed a three-channel wavelength division multiplexer by utilizing the point defect of the photonic crystal, in 2013, zhouxing and the like designed a two-channel wavelength division multiplexer, and by adding a dielectric column, the coupling efficiency of the wavelength division multiplexer is greatly improved, and in 2016, the like designed a four-channel wavelength division multiplexer by utilizing a photonic crystal ring resonant cavity; the transmissivity of each channel reaches more than 90%, but the problems of large channel spacing, large channel crosstalk value and the like exist.
The traditional wavelength division multiplexing device is realized by technical means such as fused biconical taper optical fiber and the like, and generally has the defects of large volume, difficult control and the like; compared with the wavelength division demultiplexer based on the multi-core photonic crystal fiber, the wavelength division demultiplexer has the advantages of compact structure and easy butt joint with the conventional fiber.
The invention discloses a wavelength division multiplexer based on a graphene three-core optical fiber, which utilizes the electrochemical property of graphene and the coupling characteristic of the optical fiber, and has the characteristics of compact structure, easiness in butt joint with a conventional optical fiber and the like. In addition, the invention designs the V-shaped groove which is specially used for fixedly placing the double-core optical fiber and is matched with the outer diameter of the double-core microstructure optical fiber, the metal electrode of the modulator provided by the invention is prepared on the V-shaped groove, and the width of the metal electrode extends from the D-shaped optical fiber to the top ends of two sides of the V-shaped groove, so that the modulator is more convenient to manufacture. The structure can be used as a novel integrated optical device and has great application potential in future research of optical fiber communication systems.
Disclosure of the invention
The invention aims to provide a wavelength division multiplexer based on a graphene three-core optical fiber, which has a compact structure and is easy to butt joint with a conventional optical fiber.
The purpose of the invention is realized as follows:
the wavelength division multiplexer of the graphene three-core optical fiber is characterized in that: the wavelength division multiplexer is based on a graphene three-core optical fiber. The method is characterized in that: the optical fiber cable is composed of a V-shaped groove 1, epoxy glue 2, a three-core optical fiber 3, a metal electrode 4, an H-BN transition layer 5 and a graphene layer 6. In the system, a three-core optical fiber 3 is placed in a V-shaped groove 1, and is fixed by epoxy glue 2 and then laterally thrown in the direction vertical to the length direction of the three-core optical fiber 3. Depositing a graphene layer and an H-BN transition layer 5 substrate in the side polishing area, coating a graphene layer 6 on the substrate, and preparing a metal electrode on the H-BN transition layer 5; the voltage applied by the metal electrode 4 is changed to change the refractive index of the graphene layer 6, so that the effective refractive index of the three-core optical fiber 3 is changed, the propagation constants of the middle core and the left and right cores are matched at different wavelengths, and the separation of light waves with different wavelengths at the exit end is realized.
The three fiber cores are distributed on the same straight line and have equal radius when viewed from the end face structure of the three-core optical fiber; three cores as recited: the centers of the fiber cores I and III are respectively equal to the center of the fiber core II in distance.
The V-shaped groove 1 is used for fixedly placing the three-core optical fiber 3 and is matched with the outer diameter of the three-core optical fiber 3.
The side throwing area consists of a graphene layer 6 and an H-BN transition layer 5. Firstly, a graphene layer 6 and an H-BN transition layer 5 substrate are deposited in a side polishing area, and then a graphene layer 6 is coated on the substrate. The side polishing system is adopted to polish the membrane of the double-core optical fiber, so that a gradual change concave transition structure of an optical fiber grinding area can be generated, and the insertion loss and the echo of a formed device can be reduced.
The metal electrode 4 consists of a source electrode, a drain electrode, double graphene layers 6 and an H-BN transition layer 5 coated between the double graphene layers. The metal electrode 4 is prepared on the H-BN transition layer 5, the source electrode of the metal electrode is contacted with the upper graphene layer, and the drain electrode of the metal electrode is contacted with the lower graphene layer; the width of the double-core optical fiber extends from the double-core optical fiber 3 to the top ends of two sides of the V-shaped groove 1. Because the effective refractive index of the graphene material has great dynamic adjustability along with the state of the Fermi level, the introduction of the H-BN transition layer 6 is beneficial to stabilizing the distribution stability of the mode field between two layers of graphene, and the heat transfer and the adhesive force are well matched with the graphene layer, so that the addition of the H-BN transition layer between the two layers of graphene is beneficial to increasing the strength and toughness of the optical fiber coating surface composite layer, and the equivalent capacitance model formed by the two layers of graphene and the transition layer can be effectively prevented from being broken down by an external voltage.
(IV) description of the drawings
FIG. 1 is a schematic end view of a three-core fiber having three cores with a coplanar profile.
Fig. 2 is a schematic structural diagram of a wavelength division multiplexer based on a graphene three-core optical fiber.
Fig. 3 is a schematic cross-sectional view of a graphene-based three-core fiber wavelength division multiplexer.
Fig. 4 is a schematic diagram of the relationship between driving voltage and graphene chemical potential.
(V) detailed description of the preferred embodiments
The invention is further illustrated below with reference to specific examples.
The principle of the invention is as follows:
graphene can be abstracted as an infinitely thin material with double surfaces, whose surface conductivity σ is related to the system angular frequency ω, the chemical potential μ, the scattering rate τ and the temperature T. The conductivity of the graphene is an isotropic medium, and the surface conductivity value of the graphene can be calculated by a Kubo formula
σ＝σintra+σinter
In the formula: sigmaintraIn band conductivity, σinterIs the conductivity between bands, which can be respectively expressed as
In the formula:
is a reduced Planck constant; kBIs boltzmann constant, e is electronic charge amount, T is temperature, 298K at normal temperature, tau is carrier scattering rate, tau is 2 × 1012rad/s. Thus, the magnitude of the conductivity of graphene is related to the operating frequency and chemical potential. According to the equivalent dielectric constant formula, the relation between the dielectric constant and the conductivity of the graphene is
In the formula:0is a vacuum dielectric constant; d is the thickness of the single layer graphene. The relation between the refractive index n of graphene and the dielectric constant is
Thus, the graphene conductivity and refractive index are affected by chemical potential. In addition, the chemical potential is related to the applied voltage in the relationship of
In the formula:ris a relative dielectric constant; vFAt a Fermi speed, VF＝1.1×106m/s；VgIs an applied voltage. Therefore, the direct determined relation is formed between the external voltage and the refractive index of the graphene, the refractive index and the dielectric constant of the graphene are changed by controlling the external voltage, and the coupling efficiency of the two cores is further changed, so that the feasibility of changing the refractive index of the three-core optical fiber is theoretically verified.
According to the fiber coupling principle, the coupling coefficient of an optical fiber can be expressed as:
in the formula: s1Is the area of the core 1; n isc0Is the refractive index of the core; n isc1Is the refractive index of the cladding; e1And E2The intrinsic fields of core 1 and core 2, respectively, exist alone, and the subscripts x and y represent the intrinsic fields in the x and y directions, respectively. C12The degree of influence of the core 2 on the core 1 is reflected by the magnitude of (A), and the degree of influence of the core 1 on the core 2 is represented by C21And (4) showing. The same way can obtain C32、C23The influence degrees of the core 2 on the core 3 and the core 3 on the core 2 are shown, respectively.
It is assumed that the left side of the core 2 is used as a signal input terminal and the right side of the core 1 is used as a signal output terminal. When a signal with normalized power of 1 is input, the output signal power is
In the formula:
k0is the vacuum propagation coefficient, Neff1、Neff2The effective refractive indices of the core 1 and the core 2, respectively.
When Z takes the minimum value, Z is L for the coupling length0Is shown to be
For the coupling length of the core 1 and the core 2,
the coupling length of the core 3 and the core 2. When L is mL0 1＝nL0 2The separation of the light waves can be realized.
Claims (5)
1. A wavelength division multiplexer based on a graphene three-core optical fiber. The method is characterized in that: the optical fiber cable is composed of a V-shaped groove 1, epoxy glue 2, a three-core optical fiber 3, a metal electrode 4, an H-BN transition layer 5 and a graphene layer 6. In the system, a three-core optical fiber 3 is placed in a V-shaped groove 1, and is fixed by epoxy glue 2 and then laterally thrown in the direction vertical to the length direction of the three-core optical fiber 3. Depositing a graphene layer 6 and an H-BN transition layer 5 substrate in a side polishing area, preparing a metal electrode on the H-BN transition layer 5, and coating the graphene layer 6 on the substrate; the voltage applied by the metal electrode 4 is changed to change the refractive index of the graphene layer 6, so that the effective refractive index of the three-core optical fiber 3 is changed, the propagation constants of the middle core and the left and right cores are matched at different wavelengths, and the separation of light waves with different wavelengths at the exit end is realized.
2. The graphene three-core fiber based wavelength division multiplexer according to claim 1, wherein: the three fiber cores of the three-core optical fiber 3 are distributed on the same straight line and have equal radius when viewed from the end face structure; three cores as recited: the centers of the fiber cores I3-1 and III 3-3 are respectively equal to the center of the fiber core II 3-2 in distance.
3. The graphene three-core fiber based wavelength division multiplexer according to claim 1, wherein: the V-shaped groove 1 is used for fixedly placing the three-core optical fiber 3 and is matched with the outer diameter of the three-core optical fiber 3.
4. The graphene three-core fiber based wavelength division multiplexer according to claim 1, wherein: the side throwing area consists of a graphene layer 6 and an H-BN transition layer 5. Firstly, a graphene layer 6 and an H-BN transition layer 5 substrate are deposited in a side polishing area, and then a graphene layer 6 is coated on the substrate.
5. The graphene three-core fiber based wavelength division multiplexer according to claim 1, wherein: the metal electrode 4 consists of a source electrode, a drain electrode, double graphene layers 6 and an H-BN transition layer 5 coated between the double graphene layers. The metal electrode 4 is prepared on the H-BN transition layer 5, the source electrode of the metal electrode is contacted with the upper graphene layer, and the drain electrode of the metal electrode is contacted with the lower graphene layer; the width of the double-core optical fiber extends from the double-core optical fiber 3 to the top ends of two sides of the V-shaped groove 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010508562.2A CN111650694A (en) | 2020-06-06 | 2020-06-06 | Wavelength division multiplexer based on three-core graphene optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010508562.2A CN111650694A (en) | 2020-06-06 | 2020-06-06 | Wavelength division multiplexer based on three-core graphene optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111650694A true CN111650694A (en) | 2020-09-11 |
Family
ID=72340930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010508562.2A Pending CN111650694A (en) | 2020-06-06 | 2020-06-06 | Wavelength division multiplexer based on three-core graphene optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111650694A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112859388A (en) * | 2021-01-19 | 2021-05-28 | 北京工业大学 | Enhanced graphene electroabsorption modulator based on D-type optical fiber |
| CN112946931A (en) * | 2021-03-03 | 2021-06-11 | 北京交通大学 | Three-fiber-core graphene electro-optic modulator based on directional coupling |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000058755A (en) * | 2000-06-24 | 2000-10-05 | 송재원 | Side-polished fiber optic comb filter using thick channel-type overlay waveguide |
| US20020076150A1 (en) * | 2000-06-27 | 2002-06-20 | Shulai Zhao | Evanescent optical coupling between a waveguide formed on a substrate and a side-polished fiber |
| CN101339269A (en) * | 2008-08-12 | 2009-01-07 | 江苏大学 | Optical fibre wavelength-division multiplex device |
| CN107037509A (en) * | 2017-06-16 | 2017-08-11 | 电子科技大学 | A kind of D type ultra-thin glass fiber structures of graphene auxiliary type |
| CN108872157A (en) * | 2018-04-20 | 2018-11-23 | 华中科技大学 | A kind of side polishing open ring type PCF-SPR sensor |
| CN111045228A (en) * | 2019-11-20 | 2020-04-21 | 桂林电子科技大学 | Graphene-based D-type dual-core optical fiber M-Z modulator and preparation method thereof |
-
2020
- 2020-06-06 CN CN202010508562.2A patent/CN111650694A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000058755A (en) * | 2000-06-24 | 2000-10-05 | 송재원 | Side-polished fiber optic comb filter using thick channel-type overlay waveguide |
| US20020076150A1 (en) * | 2000-06-27 | 2002-06-20 | Shulai Zhao | Evanescent optical coupling between a waveguide formed on a substrate and a side-polished fiber |
| CN101339269A (en) * | 2008-08-12 | 2009-01-07 | 江苏大学 | Optical fibre wavelength-division multiplex device |
| CN107037509A (en) * | 2017-06-16 | 2017-08-11 | 电子科技大学 | A kind of D type ultra-thin glass fiber structures of graphene auxiliary type |
| CN108872157A (en) * | 2018-04-20 | 2018-11-23 | 华中科技大学 | A kind of side polishing open ring type PCF-SPR sensor |
| CN111045228A (en) * | 2019-11-20 | 2020-04-21 | 桂林电子科技大学 | Graphene-based D-type dual-core optical fiber M-Z modulator and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112859388A (en) * | 2021-01-19 | 2021-05-28 | 北京工业大学 | Enhanced graphene electroabsorption modulator based on D-type optical fiber |
| CN112946931A (en) * | 2021-03-03 | 2021-06-11 | 北京交通大学 | Three-fiber-core graphene electro-optic modulator based on directional coupling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7529455B2 (en) | Optical integrated device and optical control device | |
| CN101359071B (en) | Light coupled device | |
| CN109613632B (en) | Adjustable resonant cavity based on flexible surface plasmon coupler and preparation method thereof | |
| CN111045228A (en) | Graphene-based D-type dual-core optical fiber M-Z modulator and preparation method thereof | |
| CN104459881A (en) | Wavelength division multiplexing type silicon substrate optical receiving chip insensitive to polarization | |
| CN111650694A (en) | Wavelength division multiplexer based on three-core graphene optical fiber | |
| CN109407209B (en) | Optical wavelength division-mode division hybrid multiplexing demultiplexer based on mode converter and Bragg waveguide grating | |
| US11287577B2 (en) | Optical mode converter for coupling between waveguides with different mode size | |
| CN115079345B (en) | Double-conical asymmetric directional coupler-based light polarization beam splitting rotator | |
| CN110376753B (en) | High-performance polarization beam splitter and design method thereof | |
| CN108508539A (en) | Silicon substrate wavelength division multiplexer based on taper asymmetrical directional coupler | |
| CN102073103B (en) | Subwavelength binary diffraction grating-based wavelength separator | |
| WO2000011508A1 (en) | Array waveguide diffraction grating optical multiplexer/demultiplexer | |
| CN115598767A (en) | CWDM optical transmitting chip | |
| CN104317071B (en) | Graphene-based planar optical waveguide polarization beam splitter | |
| US6621644B2 (en) | Optical wavelength-demultiplexer with an improved optical lens | |
| CN114415289B (en) | Low-loss wide-bandwidth wavelength multiplexing/de-multiplexing device based on silicon nitride platform | |
| CN109814206A (en) | Adjustable wavelength division multiplexer based on graphene film and toroidal cavity resonator | |
| CN204129369U (en) | A kind of single channel bandwidth tuned filter based on micro-ring | |
| CN110941048B (en) | High extinction ratio coarse wavelength division multiplexer/demultiplexer based on multi-mode interference principle | |
| CN105204112B (en) | Wavelength and polarization mixing multiplexing demultiplexing device on a kind of silicon chip | |
| FR2794534A1 (en) | OPTICAL MULTIPLEXER / DEMULTIPLEXER WITH THREE WAVEGUIDES | |
| CN113885230A (en) | Double-core optical fiber electro-optic modulator based on double-layer graphene | |
| US10802214B2 (en) | Adiabatically coupled photonic systems with vertically tapered waveguides | |
| JP2023522152A (en) | optical modulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200911 |