CN105911646B - A kind of wavelength-division mould based on photonic crystal divides hybrid multiplex demultiplexer and method - Google Patents
A kind of wavelength-division mould based on photonic crystal divides hybrid multiplex demultiplexer and method Download PDFInfo
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- CN105911646B CN105911646B CN201610413898.4A CN201610413898A CN105911646B CN 105911646 B CN105911646 B CN 105911646B CN 201610413898 A CN201610413898 A CN 201610413898A CN 105911646 B CN105911646 B CN 105911646B
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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
- G02B6/29379—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
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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 present invention is that a kind of wavelength-division mould based on photonic crystal divides hybrid multiplex demultiplexer and method, the wavelength-division mould of the photonic crystal that hybrid multiplex demultiplexer is divided to include Two dimensional square lattice photonic crystal (1), single mode waveguide one (2), single mode waveguide two (3), single mode orthogonal wave-guide one (4), single mode orthogonal wave-guide two (5), conical gradual change waveguide (6), multimode waveguide one (7), multimode waveguide two (8), point defect microcavity (9), Wavelength selective reflective microcavity (10), scattering medium column (11)；Wherein, Two dimensional square lattice structure photonic crystal (1) is the medium column type silicon photonic crystal along X Z plane periodic distributions；Row's dielectric posts are removed in Two dimensional square lattice structure photonic crystal (1) constitutes single mode waveguide one (2), single mode waveguide two (3), single mode orthogonal wave-guide one (4), single mode orthogonal wave-guide two (5)；Upper and lower translation photonic crystal constitutes multimode waveguide one (7) and multimode waveguide two (8)；It is conical gradual change waveguide (6) between single mode waveguide one (2) and multimode waveguide one (7)；Point defect microcavity (9) and Wavelength selective reflective microcavity (10), scattering medium column (11) are circular media column.
Description
Technical field
The present invention is that the wavelength-division mould based on photonic crystal divides hybrid multiplex demultiplexer and method, using Two dimensional square lattice
Wavelength-division multiplex and mode division multiplexing are integrated on a device by photonic crystal, and the technology for being related to optic communication and optical information processing is led
Domain.
Background technology
Optical communication system develops to the direction of superelevation rate, vast capacity.Wavelength-division multiplex system, mode division multiplexing at present
System and polarisation multiplex system are used to improve message capacity.But raising of the single multiplex system to capacity of communication system
It is limited, propose wavelength-division to further increase message capacity --- mould divides hybrid multiplex, and wavelength-division-mould divides hybrid multiplex/solution
Multiplexer is that wavelength-division-mould divides Primary Component in hybrid multiplex system.
Photonic crystal has the characteristic of photon band gap and photon local, introduces line defect in the photonic crystal and forms waveguide,
It introduces point defect and forms microcavity, point defect is combined with line defect realizes wavelength-division multiplex.Simultaneously according to phase matched principle,
Width by adjusting multimode waveguide realizes light wave basic mode (TE0) arrive First-Order Mode (TE1) conversion so that TE0Mould and TE1Mould
Mode division multiplexing is realized in transmission in multimode waveguide simultaneously.Wavelength-division based on photonic crystal --- mould divides hybrid multiplex/demultiplexer
It is small, it is easily integrated.And function admirable, transmissivity is high, and insertion loss is low, and channel interference is small, is communicated in high-speed high capacity
There is important value in system.
Invention content
Technical problem：The object of the present invention is to provide a kind of, and the wavelength-division mould based on photonic crystal divides hybrid multiplex demultiplexer
And method.By analyzing the structural parameters of point defect microcavity, Wavelength selective reflective microcavity and scattering medium column to transmission spectrum
It influences, changes the radius of point defect microcavity, Wavelength selective reflective microcavity and scattering medium column so that the transmitance of light wave increases
It is high.Width by changing multimode waveguide makes the light wave emergence pattern of different wave length convert, single mode waveguide and multimode waveguide group
At structure be similar to asymmetric parallel waveguide, by adjusting coupling spacing and length between asymmetric parallel waveguide, mould can be made
Formula transfer efficiency reaches highest.
Technical solution:In order to adapt to the development of ultrahigh speed, vast capacity optical communication system, we have proposed one kind being based on light
The wavelength-division mould of sub- crystal divides hybrid multiplex demultiplexer, so that it is operated in optical band, has practical application value.We use
The structure that point defect microcavity, Wavelength selective reflective microcavity and linear defect wave-guide are combined realizes the wavelength-division of 1550nm and 1310nm
Multiplexing, while the structure for the asymmetric parallel waveguide being made up of single mode waveguide and multimode waveguide realizes 1550nm and 1310 and receives
Rice basic mode to First-Order Mode conversion, to realize mode division multiplexing.
A kind of wavelength-division mould based on photonic crystal of the present invention divides hybrid multiplex demultiplexer to include Two dimensional square lattice light
Sub- crystal, single mode waveguide one, single mode waveguide two, single mode orthogonal wave-guide one, single mode orthogonal wave-guide two, conical gradual change waveguide, multimode
Waveguide one, multimode waveguide two, point defect microcavity, Wavelength selective reflective microcavity, scattering medium column；Wherein, Two dimensional square lattice knot
Structure photonic crystal is the medium column type silicon photonic crystal along X-Z plane periodic distribution；It is brilliant in Two dimensional square lattice structure photon
Row's dielectric posts are removed in body constitutes single mode waveguide one, single mode waveguide two, single mode orthogonal wave-guide one, single mode orthogonal wave-guide two；On
Lower translation photonic crystal constitutes multimode waveguide one and multimode waveguide two；It is conical gradual change between single mode waveguide one and multimode waveguide one
Waveguide, single mode waveguide one, conical gradual change waveguide, multimode waveguide one and two sequence unicom of multimode waveguide are located at Two dimensional square lattice light
On the central axes of sub- crystal；Single mode waveguide two, single mode orthogonal wave-guide one, single mode orthogonal wave-guide two are located at Two dimensional square lattice photon
The side of the central axes of crystal, point defect microcavity and Wavelength selective reflective microcavity, scattering medium column are circular media column.
The wavelength-division mould based on photonic crystal of the present invention divides the multiplexing of hybrid multiplex demultiplexer to demultiplex method：Multiplexing
When, the TE of 1550nm0Mould is inputted from single mode waveguide one, enters multimode waveguide one by conical gradual change waveguide, finally passes through multimode
Waveguide two exports；
The TE of 1310nm0Mould is inputted from single mode waveguide two, consistent with the resonant frequency of point defect microcavity, is coupled into point defect
Microcavity enters the transmission of single mode waveguide one, is transmitted to the right by the effect of Wavelength selective reflective microcavity, passes sequentially through conical gradual change wave
It leads, the output of multimode waveguide one, multimode waveguide two；
The TE of 1550nm0Mould is inputted from single mode orthogonal wave-guide one, by being coupled into mould waveguide one and being converted into TE1Mould,
It is exported using multimode waveguide two；
The TE of 1310nm0Mould is inputted by single mode orthogonal wave-guide two, by being coupled into multimode waveguide two and being converted into
TE1Mould exports；
When multiplexing, aforementioned four process is carried out at the same time；Finally there is the TE of 1550nm at two output port of multimode waveguide0、
TE1The TE of mould and 1310nm0、TE1The signal of four channels of mould exports, and divides hybrid multiplex to realize wavelength-division mould.
When demultiplexing, the TE of 1550nm0、TE1The TE of mould and 1310nm0、TE1The signals of this four channels of mould simultaneously from
The right end of multimode waveguide two inputs, and exports the TE of 1550nm after demultiplexing from single mode waveguide one and single mode orthogonal wave-guide one0Mould；It is single
Mould waveguide two and single mode orthogonal wave-guide two export the TE of 1310nm0Mould.It is demultiplexing as the inverse process of multiplexing.
The present invention is that a kind of novel photonic crystal wavelength-division-mould divides hybrid multiplex/demultiplexer, the original of multiplex/demultiplex
Reason is：Line defect is introduced in the photonic crystal and forms waveguide, is introduced point defect and is formed microcavity, point defect is combined with line defect
Realize wavelength-division multiplex.In the photonic crystal, according to phase matched principle, TE is transmitted0The propagation constant of the single mode waveguide of mould and
Transmit TE1When the propagation constant of the multimode waveguide of mould is equal, by certain coupling distance, it can to pass in single mode waveguide
Defeated TE0Mode coupling is into multimode waveguide and being converted into TE1Mould is propagated, and mode division multiplexing is realized.Wavelength-division-mould divides hybrid multiplex
Transmission channel sum is codetermined by wavelength-division multiplex number and mode division multiplexing number, it can transmit multiple wavelength, while can be transmitted each
Multiple patterns of wavelength.The photonic crystal wavelength-division that the present invention designs --- mould divides hybrid multiplex/demultiplexer to realize 1550nm
With the multiplexing of two wavelength of 1310nm, while the TE of two wavelength can be transmitted0Mould and TE1Mould is one 2 × 2 structure, in total
Realize the transmission of four channel signals.Demultiplexing is identical as the principle of multiplexing, is the inverse process of multiplexing.
Advantageous effect：The present invention devises a kind of wavelength-division mould based on photonic crystal and divides hybrid multiplex demultiplexer and side
Method introduces line defect and forms waveguide, introduces point defect and form microcavity, point defect is combined reality with line defect in the photonic crystal
Wavelength-division multiplex is showed.Simultaneously according to phase matched principle, the width by adjusting multimode waveguide realizes light wave basic mode (TE0) arrive
First-Order Mode (TE1) conversion so that TE0Mould and TE1Mode division multiplexing is realized in transmission to mould in multimode waveguide simultaneously.By wavelength-division multiplex
It is integrated in a device with mode division multiplexing, reduces device size, reduce coupling loss, and substantially increase communication system
The capacity of system.
Description of the drawings
Fig. 1 is that the wavelength-division mould based on photonic crystal of the present invention divides the structure chart of hybrid multiplex demultiplexer, is had in figure：Two
Tie up tetragonal photon crystal 1, single mode waveguide 1, single mode waveguide 23, single mode orthogonal wave-guide 1, single mode orthogonal wave-guide 25,
Conical gradual change waveguide 6, multimode waveguide 1, multimode waveguide 28, point defect microcavity 9, Wavelength selective reflective microcavity 10, scattering medium
Column 11.
When Fig. 2 (a) is multiplexing, the TE of 1550nm0Time domain steady-state response figure when mould is inputted from single mode waveguide one, Fig. 2 (b)
For corresponding stable state field intensity map.
When Fig. 3 (a) is multiplexing, the TE of 1310nm0Time domain steady-state response figure when mould is inputted from single mode waveguide two, Fig. 3 (b)
For corresponding stable state field intensity map.
When Fig. 4 (a) is multiplexing, the TE of 1550nm0Time domain steady-state response figure when mould is inputted from single mode orthogonal wave-guide one, figure
4 (b) is corresponding stable state field intensity map.
When Fig. 5 (a) is multiplexing, the TE of 1310nm0Time domain steady-state response figure when mould is inputted from single mode orthogonal wave-guide two, figure
5 (b) is corresponding stable state field intensity map.
When Fig. 6 is demultiplexing, the TE of 1550nm0Time domain steady-state response figure when mould is inputted from multimode waveguide two.
When Fig. 7 is demultiplexing, the TE of 1310nm0Time domain steady-state response figure when mould is inputted from multimode waveguide two.
When Fig. 8 is demultiplexing, the TE of 1550nm1Time domain steady-state response figure when mould is inputted from multimode waveguide two.
When Fig. 9 is demultiplexing, the TE of 1310nm1Time domain steady-state response figure when mould is inputted from multimode waveguide two.
Specific implementation mode
In order to adapt to superelevation rate, vast capacity optical communication system development, the present invention, which proposes, a kind of being based on photon
The wavelength-division mould of crystal divides hybrid multiplex demultiplexer and method, meets the requirement of high Capacity Communication System, has actual application
Value.The present invention uses the structure with Wavelength selective reflective microcavity to realize wavelength-division multiplex, while by using similar to not right
Claim parallel waveguide structure realize pattern conversion, to realize mode division multiplexing, the two is combined realize 1310nm,
The TE of 1550nm0Mould and TE1Wavelength-division-mould of mould divides hybrid multiplex and demultiplexing, and transmitance is above 90%, channel interference
It is below -13dB.
A kind of wavelength-division mould based on photonic crystal provided by the invention divides hybrid multiplex demultiplexer, including two-dimension square crystalline substance
Lattice photonic crystal, single mode waveguide one, single mode waveguide two, single mode orthogonal wave-guide one, single mode orthogonal wave-guide two, conical gradual change waveguide,
Multimode waveguide one, multimode waveguide two, point defect microcavity, Wavelength selective reflective microcavity, scattering medium column；Wherein, two-dimension square is brilliant
Lattice structure photonic crystal is the medium column type silicon photonic crystal along X-Z plane periodic distribution；In Two dimensional square lattice structure light
Row's dielectric posts are removed in sub- crystal constitutes single mode waveguide one, single mode waveguide two, single mode orthogonal wave-guide one, single mode orthogonal wave-guide
Two；Upper and lower translation photonic crystal constitutes multimode waveguide one and multimode waveguide two；It is cone between single mode waveguide one and multimode waveguide one
Shape tapered waveguide；Point defect microcavity and Wavelength selective reflective microcavity, scattering medium column are circular media column.
Design parameter is：A=0.54 μm of lattice constant, r=0.09 μm of medium column radius, point defect microcavity and wavelength selection
The radius r of reflection micro-cavitiy ,=0.2246 μm, scattering medium column radius annular r1=0.074 μm, the width W of multimode waveguide one1=
3.66a, the width W of multimode waveguide two2=3.88a, the width W=2a of all single mode waveguides.
The wavelength-division mould of this photonic crystal divides the principle of hybrid multiplex demultiplexer as follows：Line defect is introduced in the photonic crystal
Waveguide is formed, point defect is introduced and forms point defect microcavity, generate Defect Modes, when incident optical wavelength is with Defect Modes consistent wavelength
Point defect can be coupled into and propagated by line defect.Wavelength selective reflective microcavity is introduced simultaneously in the photonic crystal simultaneously, is made
Obtaining incident light wave can in the waveguide transmit according to ideal path and there is higher transmissivity to be adjusted according in due course coupled mode theory
The distance of node defect microcavity and Wavelength selective reflective microcavity so that transmitance 1.The present invention, which utilizes, has wavelength reflection microcavity
Structure realize wavelength-division multiplex.In the photonic crystal, as transmission TE0The propagation constant and transmission TE of the single mode waveguide of mould1Mould
When the propagation constant of multimode waveguide is equal, by certain coupling distance, it can make the TE transmitted in single mode waveguide0Mould coupling
In closing into multimode waveguide and it is converted into TE1Mould is propagated.Different wave length may be implemented by adjusting the width of multimode waveguide in the present invention
TE0Mould is to TE1The pattern of mould is converted.The structure of single mode waveguide and multimode waveguide composition is similar to asymmetric parallel waveguide, passes through tune
Coupling spacing and length between the asymmetric parallel waveguide of section, can make mode conversion efficiency reach highest.Wavelength-division-mould divides hybrid multiplex
Transmission channel sum codetermined by wavelength-division multiplex number and mode division multiplexing number, it can transmit multiple wavelength, while can transmit often
Multiple patterns of a wavelength.The present invention realizes the multiplexing of two wavelength of 1550nm and 1310nm, while can transmit two wavelength
TE0Mould and TE1Mould is 2 × 2 structures, realizes the transmission of four channel signals in total.Demultiplex the principle phase with multiplexing
Together, it is the inverse process of multiplexing.
The wavelength-division mould of this photonic crystal divides the course of work of hybrid multiplex demultiplexer as follows：
(1) when being multiplexed, the TE of 1550nm0Mould is inputted from single mode waveguide one, enters multimode waveguide by conical gradual change waveguide
One, finally pass through multimode waveguide two and exports；The TE of 1310nm0Mould is inputted from single mode waveguide two, the resonance frequency with point defect microcavity
Rate is consistent, is coupled into point defect microcavity and enters the transmission of single mode waveguide one, is transmitted to the right by the effect of Wavelength selective reflective microcavity,
Pass sequentially through conical gradual change waveguide, multimode waveguide one, the output of multimode waveguide two；The TE of 1550nm0Mould is from single mode orthogonal wave-guide one
Input, by being coupled into mould waveguide one and being converted into TE1Mould is exported using multimode waveguide two；The TE of 1310nm0Mould passes through
The input of single mode orthogonal wave-guide two is crossed, by being coupled into multimode waveguide two and being converted into TE1Mould exports；Finally in multimode waveguide
There is the TE of 1550nm at two output ports0、TE1The TE of mould and 1310nm0、TE1The signal of four channels of mould exports, and realizes
Wavelength-division mould divides hybrid multiplex.
(2) when demultiplexing, the TE of 1550nm0、TE1The TE of mould and 1310nm0、TE1The signal of this four channels of mould is simultaneously
It is inputted from the right end of multimode waveguide two, exports the TE of 1550nm after demultiplexing from single mode waveguide one and single mode orthogonal wave-guide one0Mould；
Single mode waveguide two and single mode orthogonal wave-guide two export the TE of 1310nm0Mould.It is demultiplexing as the inverse process of multiplexing.
Claims (3)
1. a kind of wavelength-division mould based on photonic crystal divides hybrid multiplex demultiplexer, it is characterised in that should the wave based on photonic crystal
Divide mould that hybrid multiplex demultiplexer is divided to include Two dimensional square lattice photonic crystal (1), single mode waveguide one (2), single mode waveguide two
(3), single mode orthogonal wave-guide one (4), single mode orthogonal wave-guide two (5), conical gradual change waveguide (6), multimode waveguide one (7), multimode wave
Lead two (8), point defect microcavity (9), Wavelength selective reflective microcavity (10), scattering medium column (11)；Wherein, Two dimensional square lattice knot
Structure photonic crystal (1) is the medium column type silicon photonic crystal along X-Z plane periodic distribution；In Two dimensional square lattice structure photon
Row's dielectric posts are removed in crystal (1) constitutes single mode waveguide one (2), single mode waveguide two (3), single mode orthogonal wave-guide one (4), single mode
Orthogonal wave-guide two (5)；Upper and lower translation photonic crystal constitutes multimode waveguide one (7) and multimode waveguide two (8)；In single mode waveguide one
(2) it is conical gradual change waveguide (6), single mode waveguide one (2), conical gradual change waveguide (6), multimode waveguide between multimode waveguide one (7)
One (7) and multimode waveguide two (8) sequence unicom are located on the central axes of Two dimensional square lattice photonic crystal (1)；Single mode waveguide two
(3), single mode orthogonal wave-guide one (4), single mode orthogonal wave-guide two (5) are located at the central axes of Two dimensional square lattice photonic crystal (1)
Side, point defect microcavity (9) and Wavelength selective reflective microcavity (10), scattering medium column (11) are circular media column.
2. a kind of wavelength-division mould based on photonic crystal as described in claim 1 divides the multiplexing solution compound of hybrid multiplex demultiplexer
Method, which is characterized in that when multiplexing, the TE of 1550nm0Mould is inputted from single mode waveguide one (2), is entered by conical gradual change waveguide (6)
Multimode waveguide one (7) finally passes through multimode waveguide two (8) and exports；
The TE of 1310nm0Mould is inputted from single mode waveguide two (3), consistent with the resonant frequency of point defect microcavity (9), is coupled into and is a little lacked
It falls into microcavity (9) to transmit into single mode waveguide one (2), transmits to the right by the effect of Wavelength selective reflective microcavity (10), lead to successively
Cross conical gradual change waveguide (6), multimode waveguide one (7), multimode waveguide two (8) output；
The TE of 1550nm0Mould is inputted from single mode orthogonal wave-guide one (4), by being coupled into mould waveguide one (7) and being converted into TE1
Mould is exported using multimode waveguide two (8)；
The TE of 1310nm0Mould is inputted by single mode orthogonal wave-guide two (5), by being coupled into multimode waveguide two (8) and being converted into
TE1Mould exports；
When multiplexing, aforementioned four process is carried out at the same time；Finally there is the TE of 1550nm at multimode waveguide two (8) output port0、TE1
The TE of mould and 1310nm0、TE1The signal of four channels of mould exports, and divides hybrid multiplex to realize wavelength-division mould.
3. the wavelength-division mould according to claim 2 based on photonic crystal divides the multiplexing solution compound of hybrid multiplex demultiplexer
Method, which is characterized in that when demultiplexing, the TE of 1550nm0、TE1The TE of mould and 1310nm0、TE1The signal of this four channels of mould
It inputs from the right end of multimode waveguide two (8), is exported from single mode waveguide one (2) and single mode orthogonal wave-guide one (4) after demultiplexing simultaneously
The TE of 1550nm0Mould；The TE of single mode waveguide two (3) and single mode orthogonal wave-guide two (5) output 1310nm0Mould；It is demultiplexing as being multiplexed
Inverse process.
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Families Citing this family (4)
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| CN108061927B (en) * | 2017-11-09 | 2020-01-17 | 南京邮电大学 | Photonic crystal wavelength division mode division hybrid multiplexing demultiplexer and method |
| 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 |
| CN114019604B (en) * | 2022-01-06 | 2022-05-17 | 浙江大学 | Small-sized wavelength division demultiplexing-multiplexing device |
| CN116299864B (en) * | 2023-05-18 | 2023-08-18 | 之江实验室 | Method for optimizing parameters of mode division multiplexing design area, multiplexing/demultiplexing device and system |
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