CN104698606A - Two-dimensional triangular lattice photonic crystal mode division multiplexing and demultiplexing device based on magneto-optic effect - Google Patents
Two-dimensional triangular lattice photonic crystal mode division multiplexing and demultiplexing device based on magneto-optic effect Download PDFInfo
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- CN104698606A CN104698606A CN201510106442.9A CN201510106442A CN104698606A CN 104698606 A CN104698606 A CN 104698606A CN 201510106442 A CN201510106442 A CN 201510106442A CN 104698606 A CN104698606 A CN 104698606A
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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
- G02F1/09—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 based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/095—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 based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/1225—Basic optical elements, e.g. light-guiding paths comprising photonic band-gap structures or photonic lattices
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Abstract
The invention relates to a two-dimensional triangular lattice photonic crystal mode division multiplexing/demultiplexing device based on a magneto-optic effect. Two-dimensional triangular lattice medium post photonic crystals (1) are photonic crystals distributed periodically along an X-Z plane; square medium posts of the photonic crystals are arrayed according to a triangular lattices; the medium posts are made of silicon; a background material is air; an input main waveguide area (2) is formed by removing a row of medium posts; a TE mode output waveguide area (3) is formed by a row of TbYbBiIG medium posts; and a TM mode output waveguide area (4) is formed by three rows of medium posts filled with magneto-optic TbYbBiIG materials. The TE mode output waveguide area and the TM mode output waveguide area are located on the right side and the upper side of the input main waveguide area respectively, and the input main waveguide area is a mode demultiplexing area.
Description
Technical field
The present invention is that a kind of two-dimentional triangular crystal lattice photonic crystal mould based on magneto-optic effect divides multiplexing demultiplexing device, and especially a kind of TE/TM pattern mould of optical communicating waveband divides multiplexing demultiplexing device, relates to the technical field of optical communication and optical information processing.
Background technology
At present, large-capacity data transmission is the large problem that people face, and mould divides the multiplexing gordian technique addressed this problem just.Mould divides multiplex technique to be a kind of brand-new light MIMO transmission form, utilizes limited stable mode as independent channel transmission of information, can improve power system capacity and spectrum efficiency exponentially.And magneto-optical crystal is the material with magneto-optic effect, the special nature of magneto-optical crystal can be utilized, be applied to following mould and divide multiplexed optical communications field.In mould point multipurpose photo-communication system, one of Primary Component is that mould divides multiplexing demultiplexing device, photonic crystal mould based on magneto-optic effect divides multiplexing demultiplexing device, not only can meet the demand of large-capacity data transmission, and its size is only in micron dimension, the light integrated system for future has potential using value.
The mechanism of this photonic crystal mould point multiplex/demultiplex is the magneto-optic effect utilizing magneto-optical crystal.When applying external magnetic field to magneto-optical crystal, due to magneto-optic effect, causing magnetic permeability to change, and then causing the change of refractive index.For TE pattern, outer magnetic field direction in the y-direction time because magnetic direction is vertical with the magnetic-field component Hz direction of TE mould, cause the motion of magnetic dipole around, magnetic permeability changes.In like manner, for TM pattern, only have when outer magnetic field direction is along z-axis, magnetic permeability just changes along with the change in magnetic field.Different mode is utilized to be subject to the otherness of Magnetic control can realize dividing multiplexing demultiplexing device based on the photonic crystal mould of magneto-optic effect.
Photonic crystal mould based on magneto-optic effect divides multiplexing demultiplexing device to have following advantage: device size is little, only have micron dimension, is easy to that optics is integrated, insertion loss is low, the crosstalk between pattern is little, stability and reliability high.
Two dimension triangular crystal lattice photonic crystal mould divides multiplexing demultiplexing device to be realize by introducing the dielectric posts of filling magneto-optic memory technique TbYbBiIG at two points of beam waveguide places of photonic crystal.Work as z, when the externally-applied magnetic field in y direction is applied to the output waveguide place of TE and TM pattern respectively, the magnetic permeability of its magneto-optic memory technique of filling can change along with the change of magnetic field intensity, make TE in two points of beam waveguides, there is the change of otherness in the distribution of being with of TM pattern, make it to lay respectively at forbidden band and passband, and then the transmission of control TE and TM pattern, the two-dimentional triangular crystal lattice photonic crystal mould achieved based on magneto-optic effect divides multiplexing demultiplexing device.
Summary of the invention
Technical matters: the present invention seeks to propose a kind of two-dimentional triangular crystal lattice photonic crystal mould based on magneto-optic effect and divide multiplexing and demodulation multiplexer, utilize magneto-optic effect, achieve TE, the mould between TM two patterns divides multiplex/demultiplex, increases the transmission capacity of optical waveguide.
Technical scheme: height is integrated, the development of Large Copacity optical communication system in order to adapt to, transmit the light signal of multiple pattern in optical waveguide simultaneously, the present invention proposes a kind of two-dimentional triangular crystal lattice photonic crystal mould based on magneto-optic effect and divide multiplexing and demodulation multiplexer, two patterns can be separated, there is actual using value.Traditional photonic crystal waveguide device only can carry out the transmission of a pattern, such as based on the wavelength-division multiplex system that microcavity is coupled; And in photonic crystal polarization beam splitter, although there has been the polarization beam splitting about TE/TM pattern to design, it does not possess beam splitting transmission channel and desirable performance parameter, limit practical application.This patent is adopted and is formed waveguide in two ways: one is that removal medium post forms the waveguide of line defect formation; Two is introduce the dielectric posts of filling magneto-optic memory technique TbYbBiIG to form waveguide.Be aided with and choose suitable waveguide length and width, thus realize dividing multiplexing demultiplexing device based on the photonic crystal mould of magneto-optic effect efficiently, the transmissivity of itself TE and TM pattern is all higher than 92%, and channel isolation is respectively 19.7dB and 42.1dB.
Photonic crystal mould based on magneto-optic effect divides and multiplexingly comprises two-dimentional triangular crystal lattice medium column type photonic crystal with demodulation multiplexer, input main waveguide section, TE mould output waveguide district, TM mould output waveguide district.TE mould output waveguide and TM mould output waveguide lay respectively at right side and the upside of primary input waveguide, apply the externally-applied magnetic field along z, y direction respectively at TE, TM mould output waveguide place.Externally-applied magnetic field is provided by the spiral winding that is energized.Magnetic pole is set in photonic crystal panel upper and lower end face, applies the controlling magnetic field Bz along z-axis at TE mould output waveguide place, apply the controlling magnetic field By along y-axis at TM mould output waveguide place.
This mould divides and multiplexingly comprises two-dimentional triangular crystal lattice silicon photonic crystal with demodulation multiplexer, input main waveguide section, TE mould output waveguide district, TM mould output waveguide district; Wherein, two-dimentional triangular crystal lattice photonic crystal is the medium column type silicon photonic crystal along the distribution of X-Z planar periodic; In two-dimentional triangular crystal lattice silicon photonic crystal, remove row's dielectric posts form the main waveguide section of input; In two-dimentional triangular crystal lattice silicon photonic crystal, introduce a row mix Bi rare-earth iron garnet monocrystalline TbYbBiIG dielectric posts formation TE mould output waveguide district; In two-dimentional triangular crystal lattice silicon photonic crystal, introduce three row TbYbBiIG dielectric posts form TM mould output waveguide district; TE mould output waveguide district and TM mould output waveguide district lay respectively at the right side and upside that input main waveguide section, and this region is mode multiplexing and demultiplexing region.
Described mould divide multiplexing with demodulation multiplexer by controlling direction and the magnetic field intensity of externally-applied magnetic field, mould is divided and multiplexingly with demultiplexing region, magneto-optic effect occurs, regulate fill the magnetic permeability of the tunable material TbYbBiIG of magnetic control, what change TE and TM pattern can be with distribution, thus the mould realizing TE and TM pattern divides multiplexing and demultiplexing.
This mould divides the demultiplexing process of multiplexing demultiplexing device to be: the TE of two bundle 1.55 mu m wavebands, and TM light is simultaneously incident along main waveguide, and TE mould output waveguide controls by externally-applied magnetic field Bz, and for TE pattern, its dielectric posts magnetic permeability changes, and now TE light is positioned at passband; And TM pattern magnetic permeability is not changed, now TM mould is positioned at forbidden band.Therefore, the TE light of 1.55 μm is only had can be exported by TE mode output waveguide.In like manner, TM mould output waveguide controls by externally-applied magnetic field By, and only for TM light, the magnetic permeability of its dielectric posts changes, and does not change for TE pattern magnetic permeability, namely only has TM light to transmit by TM mould output waveguide.So just, achieve the demultiplexing of two kinds of patterns, multiplex process is the inverse process of demultiplexing.
Beneficial effect: the two-dimentional triangular crystal lattice photonic crystal mould of a kind of magneto-optic effect that the present invention proposes divides multiplexing and demodulation multiplexer, can realize the multiplex/demultiplex of TE/TM pattern.In the two-dimentional triangular crystal lattice photonic crystal with wider complete band gap, introduce TE and the TM light that main waveguide section can realize 1.55 mu m wavebands to transmit simultaneously, introduce the dielectric posts of filling magneto-optic memory technique TbYbBiIG and form the mould decomposition multiplex that the waveguide of mould decomposition multiplex can realize TE and TM light, the transmissivity of itself TE and TM pattern is all higher than 92%, and channel isolation is respectively 19.7dB and 42.1dB.Meanwhile, the magneto-optical crystal of filling TbYbBiIG material has faraday's enhancement effect and very little optical absorption loss at near-infrared band, stable performance.Therefore, this device can be good at the demand meeting following high integrated, jumbo mould point multipurpose photo-communication system.
Accompanying drawing explanation
Fig. 1 is that the two-dimentional triangular crystal lattice photonic crystal mould based on magneto-optic effect that the present invention proposes divides structural drawing that is multiplexing and demodulation multiplexer, in Fig. 1: two-dimentional triangular crystal lattice medium column type photon crystal 1, input main waveguide section 2, TE mould output waveguide district 3, TM mould output waveguide district 4.
The propagation time domain steady state picture of TE mould light beam when Fig. 2 a is demultiplexing,
The propagation time domain steady state picture of TM mould light beam when Fig. 2 b is demultiplexing.
Embodiment
The photonic crystal mould of magneto-optic effect divides and multiplexingly comprises two-dimentional triangular crystal lattice photon crystal 1 with demodulation multiplexer, input main waveguide section 2, TE mould output waveguide district 3, TM mould output waveguide district 4; Wherein, two-dimentional triangular crystal lattice photon crystal 1 distributes along X-Z planar periodic.Input main waveguide section 2 to form by removing row's dielectric posts, TE mould output waveguide district 3 is formed by introducing 1 × 17 TbYbBiIG dielectric posts post, and TM mould output waveguide district 4 is formed by introducing 3 × 11 TbYbBiIG dielectric posts.On the right side of the main waveguide section 2 of input, introduce TE mould output waveguide district 3, introduce TM mould output waveguide district 4 in upside.The two-dimentional triangular crystal lattice photonic crystal mould based on magneto-optic effect that the present invention proposes divides multiplexing demultiplexing device transmission wavelength to be 1.55 μm.
Design parameter is: the dielectric posts material in two-dimentional triangular crystal lattice photonic crystal is silicon (n=3.4), and background material is air (n=1), grating constant a
1=1.309 μm, square dielectric posts length of side width
1=0.44 μm, anglec of rotation θ=49 °, TbYbBiIG dielectric posts refractive index n in TE mould output waveguide
2=2.3, size width
2=0.44 μm, grating constant a
2=0.92 μm, and in TM mould output waveguide, the size of TbYbBiIG dielectric posts is all identical with silicon dielectric posts with grating constant.Magnetic pole is set in photonic crystal panel upper and lower end face, applies the controlling magnetic field B along ferrite column y-axis direction at TM mould output waveguide place
y, controlling magnetic field B is along the z-axis direction applied at TE mould output waveguide place
z.When along B
yand B
zmagnetic field intensity when being 10.5T, because magneto-optic memory technique TbYbBiIG produces magneto-optic effect, magnetic permeability is changed along with the change of applied field strengths, causes refractive index generation respective change.In TE mould output waveguide, magnetic permeability corresponding to TM pattern becomes 2.19, and namely refractive index becomes 3.4, and refractive index corresponding to TE pattern does not become 2.3.In like manner, in TM mould output waveguide, refractive index corresponding to TM pattern does not become 2.3, and refractive index corresponding to TE pattern becomes 3.4.
Principle of work based on the photonic crystal mould decomposition multiplex device of magneto-optic effect is as follows: the introducing of line defect, essence is that the light wave that frequency is dropped within the scope of complete photonic bandgap passes through line defect for TE and the TM optical transport of 1.55 mu m wavebands provides main transmission waveguide.The mould decomposition multiplex waveguide of filling magneto-optic memory technique TbYbBiIG produces magneto-optic effect under the control of externally-applied magnetic field, its magnetic permeability changes along with the change of magnetic field intensity, cause the change of refractive index, and then change TE and TM pattern respectively at TE, can distribution be with in TM mode output waveguide, the demultiplexing of TE/TM pattern can be realized by the transmission controlling these two patterns.
Demultiplexing process is as follows: TE and the TM light of two bundle 1.55 mu m wavebands is simultaneously along when inputting main waveguide 2 incidence:
(1) when place of TE mould output waveguide district 3 applies externally-applied magnetic field in the z-direction, refractive index corresponding to TM pattern becomes 3.4, and refractive index corresponding to TE pattern is still 2.3.Now TE mould is positioned at passband, and TM mould is positioned at forbidden band, and therefore TE light transmits, as shown in Fig. 2 (a) by TE mould output waveguide district 3.Now the transmissivity of TE mould is 93%, and channel isolation is 19.7dB.
(2) when place of TM mould output waveguide district 3 applies externally-applied magnetic field in the y-direction, refractive index corresponding to TE pattern becomes 3.4, and refractive index corresponding to TM pattern is still 2.3.Now TM mould is positioned at passband, and TE mould is positioned at forbidden band, and therefore TM light transmits, as shown in Fig. 2 (b) by TM mould output waveguide district 4.Now the transmissivity of TM mould is 92.4%, and channel isolation is 42.1dB.
Claims (2)
1. the two-dimentional triangular crystal lattice photonic crystal mould of magneto-optic effect divides a multiplexing and demodulation multiplexer, it is characterized in that this mould divide multiplexingly comprise two-dimentional triangular crystal lattice silicon photonic crystal (1) with demodulation multiplexer, input main waveguide section (2), TE mould output waveguide district (3), TM mould output waveguide district (4); Wherein, two-dimentional triangular crystal lattice photonic crystal (1) is the medium column type silicon photonic crystal along the distribution of X-Z planar periodic; In two-dimentional triangular crystal lattice silicon photonic crystal (1), remove row's dielectric posts form the main waveguide section of input (2); In two-dimentional triangular crystal lattice silicon photonic crystal (1), introduce a row mix Bi rare-earth iron garnet monocrystalline TbYbBiIG dielectric posts formation TE mould output waveguide district (3); In two-dimentional triangular crystal lattice silicon photonic crystal (1), introduce three row TbYbBiIG dielectric posts form TM mould output waveguide district (4); TE mould output waveguide district and TM mould output waveguide district lay respectively at the right side and upside that input main waveguide section, and this region is mode multiplexing and demultiplexing region.
2. the two-dimentional triangular crystal lattice photonic crystal mould of magneto-optic effect divides multiplexing and demodulation multiplexer according to claim 1, it is characterized in that: described mould divide multiplexing with demodulation multiplexer by controlling direction and the magnetic field intensity of externally-applied magnetic field, mould is divided and multiplexingly with demultiplexing region, magneto-optic effect occurs, regulate fill the magnetic permeability of the tunable material TbYbBiIG of magnetic control, what change TE and TM pattern can be with distribution, thus the mould realizing TE and TM pattern divides multiplexing and demultiplexing.
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Cited By (7)
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| WO2017140141A1 (en) * | 2016-02-15 | 2017-08-24 | 深圳大学 | Right-angled output magneto-optical modulator for photonic crystal t-shaped waveguide |
| WO2017140139A1 (en) * | 2016-02-15 | 2017-08-24 | 深圳大学 | Lateral-output magneto-optical modulator on the basis of photonic crystal t-type waveguide |
| WO2018041186A1 (en) * | 2016-08-31 | 2018-03-08 | 深圳大学 | Magnetic surface fast-mode arbitrary-angle unidirectional bent waveguide with low-loss magneto-optical gap |
| CN109976002A (en) * | 2019-03-25 | 2019-07-05 | 南京邮电大学 | One kind is based on mixing Bi rare-earth iron garnet magnetic control photon crystal filter |
| CN110196469A (en) * | 2019-06-26 | 2019-09-03 | 青岛大学 | Slower rays feature measurement and dynamic modulation method in coupler photonic crystal waveguide |
| CN113419304A (en) * | 2021-06-11 | 2021-09-21 | 太原理工大学 | Optical communication waveband wavelength division multiplexing silicon-based energy valley photonic crystal structure |
| CN114545553A (en) * | 2022-03-10 | 2022-05-27 | 浙江大学 | Optical topology duplexer based on coupling topology waveguide |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017140141A1 (en) * | 2016-02-15 | 2017-08-24 | 深圳大学 | Right-angled output magneto-optical modulator for photonic crystal t-shaped waveguide |
| WO2017140139A1 (en) * | 2016-02-15 | 2017-08-24 | 深圳大学 | Lateral-output magneto-optical modulator on the basis of photonic crystal t-type waveguide |
| WO2018041186A1 (en) * | 2016-08-31 | 2018-03-08 | 深圳大学 | Magnetic surface fast-mode arbitrary-angle unidirectional bent waveguide with low-loss magneto-optical gap |
| CN109976002A (en) * | 2019-03-25 | 2019-07-05 | 南京邮电大学 | One kind is based on mixing Bi rare-earth iron garnet magnetic control photon crystal filter |
| CN110196469A (en) * | 2019-06-26 | 2019-09-03 | 青岛大学 | Slower rays feature measurement and dynamic modulation method in coupler photonic crystal waveguide |
| CN113419304A (en) * | 2021-06-11 | 2021-09-21 | 太原理工大学 | Optical communication waveband wavelength division multiplexing silicon-based energy valley photonic crystal structure |
| CN113419304B (en) * | 2021-06-11 | 2022-06-17 | 太原理工大学 | Optical communication waveband wavelength division multiplexing silicon-based energy valley photonic crystal structure |
| CN114545553A (en) * | 2022-03-10 | 2022-05-27 | 浙江大学 | Optical topology duplexer based on coupling topology waveguide |
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