CN104678492B - Mode division multiplexing and de-multiplexing device based on photonic crystal - Google Patents
Mode division multiplexing and de-multiplexing device based on photonic crystal Download PDFInfo
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- CN104678492B CN104678492B CN201510088523.0A CN201510088523A CN104678492B CN 104678492 B CN104678492 B CN 104678492B CN 201510088523 A CN201510088523 A CN 201510088523A CN 104678492 B CN104678492 B CN 104678492B
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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
Abstract
The invention relates to a mode division multiplexing and de-multiplexing device based on a two-dimensional square lattice dielectric cylindrical photonic crystal. The two-dimensional square lattice dielectric cylindrical photonic crystal (1) is formed by arranging cylindrical dielectric cylinders according to a square lattice and periodically distributing along an X-Z plane, the dielectric cylinders are made of silicon, and a background material is air; a conventional single-mode waveguide region (2) is formed by removing the one row of dielectric cylinders, and a conventional multi-mode waveguide region (3) is formed by removing the three rows of dielectric cylinders; a non-conventional single-mode waveguide region (4) is formed by changing the radiuses and the refractive indexes of the one row of dielectric cylinders, and the dielectric cylinders are made of quartz; the one row of dielectric cylinders is spaced between non-conventional single-mode waveguide and conventional multi-mode waveguide, and the region is a mode coupling region (5).
Description
Technical field
The present invention is the double of a kind of mode division multiplexing/demultiplexer based on photonic crystal, especially a kind of optical communicating waveband
Pattern mode division multiplexing/demultiplexer, is related to the technical field of optic communication and optical information processing.
Background technology
Photonic crystal is of great interest as a kind of new optical functional materialses.People just attempt to
The special nature of photonic crystal, develops more optical components.At present, large-capacity data transmission be people face it is one big
Problem, mode division multiplexing exactly solves the key technology of this problem.Mode division multiplexing based on photonic crystal/demultiplexing device, no
The demand of large-capacity data transmission can only be met, and its size has only in micron dimension for following light integrated system
Potential application value.
The mechanism of mode division multiplexing is using phase matched principle.When the propagation constant of the different mode in two waveguides of light wave
When equal, there is the coefficient of coup very high each other.By certain coupling length, it is possible to achieve light wave is between two waveguides
Patten transformation.And effective refractive index of the size of propagation constant with light wave mode in the waveguide is relevant, so generally calculate
It is light wave mode effective refractive index in the waveguide.
Photonic crystal mode division multiplexing/demultiplexer based on dimensional square lattice photonic crystal with hollow rod type has the advantage that：Device
Size is small, only micron dimension, it is easy to which optics is integrated, insertion loss is low, and the crosstalk between pattern is small, stability and reliability
By force.
2 D photon crystal mode division multiplexing/demultiplexer is by adjusting the medium column radius and folding in unconventional single mode waveguide area
The phase matched that the rate of penetrating is come between implementation pattern.When the medium column radius and its refractive index in unconventional single mode waveguide area change
When, unconventional single mode waveguide still only allows basic mode to be transmitted, but effective refractive index of the basic mode in unconventional single mode waveguide will
Can change therewith.By the adjustment to effective refractive index, the condition of phase matched is reached, so that the coupling between implementation pattern
Close conversion.
The content of the invention
Technical problem：The present invention seeks to propose that a kind of mould based on dimensional square lattice photonic crystal with hollow rod type photonic crystal point is multiple
With with demultiplexer, it utilizes phase matched principle, realizes mode division multiplexing and demultiplexing between two patterns, increases light
The transmission capacity of waveguide.
Technical scheme:In order to adapt to the development of highly integrated Large Copacity optical communication system, can be in fiber waveguide device simultaneously
The optical signal of the multiple patterns of transmission, it is multiple we have proposed a kind of mould based on dimensional square lattice photonic crystal with hollow rod type photonic crystal point
With/demultiplexer, two patterns can be multiplexed, with actual application value.Traditional photonic crystal waveguide device is only
It is only capable of carrying out a transmission for pattern, for example the wavelength-division multiplex system based on microcavity coupling；And in silica-based waveguides system, although
There are many designs on mode division multiplexing system, but its size is limited can not do smaller by its transporting mechanism.The present invention
Waveguide is constituted using two ways：One is that removal medium post forms line defect composition waveguide；Two be change dielectric posts radius and
Refractive index is so as to form waveguide.It is aided with the suitable coupling length of selection again, so as to realize based on dimensional square lattice photonic crystal with hollow rod type
Mode division multiplexing/the demultiplexer of photonic crystal.
A kind of mode division multiplexing based on photonic crystal of the invention includes Two dimensional square lattice structure photon with demultiplexer
Crystal (1), conventional single mode waveguide (2), conventional multi-mode waveguide (3), unconventional single mode waveguide (4), Mode Coupling (5)；Wherein, two
Dimension tetragonal structure photonic crystal (1) is along the medium column type silicon photonic crystal of X-Z plane periodic distribution；In two-dimension square
Row's dielectric posts are removed in lattice structure photonic crystal (1) and constitutes conventional single mode waveguide (2)；In Two dimensional square lattice structure photon
Three row's dielectric posts are removed in crystal (1) and constitutes conventional multi-mode waveguide (3)；Change in Two dimensional square lattice structure photonic crystal (1)
The radius and refractive index for becoming row's dielectric posts constitute unconventional single mode waveguide (4)；Unconventional single mode waveguide (4) and conventional single mode
It is separated by row's dielectric posts between waveguide (2), this region is Mode Coupling (5).
The constituted mode of unconventional single mode waveguide (4), it is different from the conventional method for introducing line defect, but by changing
Come what is realized, such structure more conveniently carries out the adjustment that matches to the radius and refractive index of dielectric posts.
Conventional single mode waveguide (2) is a kind of symmetrical connected mode, such knot with the connected mode of conventional multi-mode waveguide (3)
Structure is conducive to the reflection loss caused by mode mismatch when suppressing light wave by two waveguides.
Mode division multiplexing/demultiplexer based on dimensional square lattice photonic crystal with hollow rod type photonic crystal is situated between including Two dimensional square lattice
Matter column type photonic crystal, conventional single mode waveguide section, conventional multi-mode waveguide section, unconventional single mode waveguide area, Mode Coupling area.The mould
Dividing the multiplex process of multiplexing demultiplexing device is：A branch of basic mode light is incident along conventional single mode waveguide, and another Shu Jimo light along
Unconventional single mode waveguide is incident, and two row's dielectric posts are separated by between conventional single mode waveguide and unconventional single mode waveguide.Due to basic mode light
Effective refractive index in conventional single mode waveguide and unconventional single mode waveguide, so hardly occurring between two beam basic mode light
Coupling.In Mode Coupling area, due to effective refractive index of the basic mode light beam in unconventional single mode waveguide with First-Order Mode light beam normal
Effective refractive index in rule multimode waveguide is equal, meets phase-matching condition, so the basic mode propagated in unconventional single mode waveguide
Light passes through to be coupled into conventional multi-mode waveguide and be transformed into First-Order Mode during Mode Coupling area；And basic mode light beam is in unconventional single mode
Effective refractive index and effective refractive index of the basic mode light beam in conventional multi-mode waveguide in waveguide, are unsatisfactory for phase matched bar
Part, so not coupled when the basic mode light beam propagated in conventional multi-mode waveguide is by coupled zone.So just realize two kinds
The multiplexing of pattern.Demultiplexing is the inverse process of multiplexing.
Beneficial effect：A kind of photonic crystal mode division multiplexing based on dimensional square lattice photonic crystal with hollow rod type proposed by the present invention/
Demultiplexer, it is possible to achieve double mode multiplexing and demultiplexing.The multiplexing demultiplexing device is in dimensional square lattice photonic crystal with hollow rod type light
In sub- crystal, unconventional single mode waveguide is constituted by the radius and refractive index that change dielectric posts, and enable to different mode
Between reach phase-matching condition, it is achieved thereby that efficient Mode Coupling.Between conventional single mode waveguide and conventional multi-mode waveguide
Symmetrical connected mode is used, the efficiency of transmission of light wave is effectively improved.The device can well meet following collection high
Into the demand of, the mode division multiplexing optical communication system of Large Copacity.
Brief description of the drawings
Fig. 1 is the structure chart of photonic crystal mode division multiplexing/demultiplexer proposed by the present invention, is had in Fig. 1：Two-dimension square is brilliant
Lattice medium column type photon crystal 1, conventional single mode waveguide 2, conventional multi-mode waveguide 3, unconventional single mode waveguide 4, Mode Coupling 5.
The propagation time domain steady state picture of basic mode light beam when Fig. 2 a are multiplexing,
The propagation time domain steady state picture of First-Order Mode light beam when Fig. 2 b are multiplexing.
The propagation time domain steady state picture of basic mode light beam when Fig. 3 a are demultiplexing,
The propagation time domain steady state picture of First-Order Mode light beam when Fig. 3 b are demultiplexing.
Specific embodiment
Mode division multiplexing/demultiplexer based on dimensional square lattice photonic crystal with hollow rod type photonic crystal includes tetragonal structure light
Sub- crystal (1), conventional single mode waveguide (2), conventional multi-mode waveguide (3), unconventional single mode waveguide (4), Mode Coupling (5)；Wherein,
Two dimensional square lattice photonic crystal (1) is along X-Z plane periodic distribution.Conventional single mode waveguide (2) is by removing a row
What dielectric posts were constituted, conventional multi-mode waveguide (3) is constituted by removing three row's dielectric posts, and unconventional single mode waveguide (4) is logical
Cross change dielectric posts radius and refractive index size constitute.Conventional single mode waveguide and conventional multi-mode waveguide are used and symmetrically connected
Connect mode.There is a Mode Coupling (5) between conventional multi-mode waveguide (3) and unconventional single mode waveguide (4), coupling length is
5 lattice parameters.Photonic crystal mode division multiplexing based on dimensional square lattice photonic crystal with hollow rod type proposed by the present invention/demultiplexer is passed
Defeated wavelength is 1550nm.
Design parameter is：A=0.53 μm of lattice parameter, R=0.0954 μm of medium column radius, silicon medium refraction index n=
3.4；R=0.1007 μm of medium column radius in unconventional single mode waveguide area, refractive index n '=1.55, its dielectric material is quartz；
Mode Coupling section length is 5 lattice parameters.
Operation principle based on photonic crystal mode division multiplexing/demultiplexer is as follows:The introducing of line defect, it is light wave to be substantially
Transmission provide waveguide, enable the light wave that frequency falls in the range of forbidden photon band by line defect.Conventional single mode waveguide and
The symmetrical connected mode of conventional multi-mode waveguide, inhibits the reflection loss caused by mode mismatch well.Adjust unconventional list
The radius and refractive index of dielectric posts in mould waveguide so that effective refractive index of the basic mode in unconventional single mode waveguide exists with First-Order Mode
Effective refractive index in conventional multi-mode waveguide is equal, meets phase-matching condition, and now basic mode light can be from unconventional single mode ripple
First-Order Mode is coupled into conventional multi-mode waveguide and is transformed into leading.By choosing suitable coupling length, pattern coupling can be improved
Close efficiency.
Multiplex process is as follows：A branch of basic mode light is incident along conventional single mode waveguide (2), and another Shu Jimo light is along very
Rule single mode waveguide (4) are incident, and two row's dielectric posts are separated by between conventional single mode waveguide and unconventional single mode waveguide.Because basic mode light exists
Effective refractive index in conventional single mode waveguide and unconventional single mode waveguide, so hardly there is coupling between two beam basic mode light
Close.In Mode Coupling area (5), due to effective refractive index of the basic mode light beam in unconventional single mode waveguide with First-Order Mode light beam normal
Effective refractive index in rule multimode waveguide (3) is equal, meets phase-matching condition, so propagated in unconventional single mode waveguide
Basic mode light passes through to be coupled into conventional multi-mode waveguide and be transformed into First-Order Mode during Mode Coupling area；And basic mode light beam is unconventional
Effective refractive index and effective refractive index of the basic mode light beam in conventional multi-mode waveguide in single mode waveguide, are unsatisfactory for phase
With condition, so not coupled when the basic mode light beam propagated in conventional multi-mode waveguide is by coupled zone.As described above, so
Just the multiplexing of both of which is realized.Demultiplexing process is the inverse process of multiplex process.
Claims (3)
1. a kind of mode division multiplexing and demultiplexer based on photonic crystal, it is characterised in that should based on photonic crystal mode division multiplexing with
Demultiplexer includes Two dimensional square lattice structure photonic crystal (1), conventional single mode waveguide (2), conventional multi-mode waveguide (3), very
Rule single mode waveguide (4), Mode Coupling (5)；Wherein, Two dimensional square lattice structure photonic crystal (1) is periodically divided along X-Z plane
The medium column type silicon photonic crystal of cloth；Row's dielectric posts are removed in Two dimensional square lattice structure photonic crystal (1) and constitutes routine
Single mode waveguide (2)；Three row's dielectric posts are removed in Two dimensional square lattice structure photonic crystal (1) and constitutes conventional multi-mode waveguide (3)；
The radius and refractive index for changing row's dielectric posts in Two dimensional square lattice structure photonic crystal (1) constitute unconventional single mode waveguide
(4)；It is separated by row's dielectric posts between unconventional single mode waveguide (4) and conventional single mode waveguide (2), this region is Mode Coupling
(5)。
2. mode division multiplexing and demultiplexer based on photonic crystal according to claim 1, it is characterised in that unconventional list
The constituted mode of mould waveguide (4), it is different from the conventional method for introducing line defect, but by changing the radius and folding of dielectric posts
Penetrate rate to realize, such structure more conveniently carries out the adjustment that matches.
3. mode division multiplexing and demultiplexer based on photonic crystal according to claim 1, it is characterised in that conventional single mode
Waveguide (2) is a kind of symmetrical connected mode with the connected mode of conventional multi-mode waveguide (3), and such structure is conducive to suppressing light wave
The reflection loss caused by mode mismatch during by two waveguides.
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Cited By (2)
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| CN107976738A (en) * | 2017-11-15 | 2018-05-01 | 南京邮电大学 | Wavelength-division mould based on photonic crystal and Nanowire Waveguides divides hybrid multiplex device |
| CN111323874A (en) * | 2018-12-17 | 2020-06-23 | 山东大学 | Composite structure photonic crystal wavelength division multiplexing device and use method thereof |
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| CN106094119B (en) * | 2016-08-01 | 2018-11-27 | 南京邮电大学 | Three mode mode division multiplexings and demultiplexer based on photonic crystal |
| CN110531462B (en) * | 2019-09-06 | 2020-09-01 | 北京大学 | Conical structure parameter optimization method and system for optical mode division multiplexer |
| WO2021071664A1 (en) * | 2019-10-08 | 2021-04-15 | Corning Incorporated | Optical systems comprising binary photonics lattices |
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| CN102116905A (en) * | 2011-01-07 | 2011-07-06 | 南京邮电大学 | Two-dimensional photonic crystal four-wavelength division multiplexer based on multiple-mode interference |
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| CN101546013A (en) * | 2009-05-08 | 2009-09-30 | 东南大学 | Wavelength division multiplexer/demodulation multiplexer based on multimode interference effect of two-dimensional photonic crystals |
| CN102116905A (en) * | 2011-01-07 | 2011-07-06 | 南京邮电大学 | Two-dimensional photonic crystal four-wavelength division multiplexer based on multiple-mode interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107976738A (en) * | 2017-11-15 | 2018-05-01 | 南京邮电大学 | Wavelength-division mould based on photonic crystal and Nanowire Waveguides divides hybrid multiplex device |
| CN107976738B (en) * | 2017-11-15 | 2019-10-01 | 南京邮电大学 | Wavelength-division mould based on photonic crystal and Nanowire Waveguides divides hybrid multiplex device |
| CN111323874A (en) * | 2018-12-17 | 2020-06-23 | 山东大学 | Composite structure photonic crystal wavelength division multiplexing device and use method thereof |
| CN111323874B (en) * | 2018-12-17 | 2021-05-18 | 山东大学 | Composite structure photonic crystal wavelength division multiplexing device and use method thereof |
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