CN105911646A - Wavelength division die division mixing multiplexing demultiplexer based on photonic crystal and method thereof - Google Patents
Wavelength division die division mixing multiplexing demultiplexer based on photonic crystal and method thereof Download PDFInfo
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- CN105911646A CN105911646A CN201610413898.4A CN201610413898A CN105911646A CN 105911646 A CN105911646 A CN 105911646A CN 201610413898 A CN201610413898 A CN 201610413898A CN 105911646 A CN105911646 A CN 105911646A
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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
-
- 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 discloses a wavelength division die division mixing multiplexing demultiplexer based on a photonic crystal and a method thereof. The wavelength division die division mixing multiplexing demultiplexer based on the photonic crystal comprises a two-dimensional square lattice photonic crystal (1), a single mode waveguide 1 (2), a single mode waveguide 2 (3), a single mode right angle waveguide 1 (4), a single mode right angle waveguide 2 (5), a tapered gradual change waveguide (6), a multi-mode waveguide 1 (7), a multi-mode waveguide 2 (8), a point defect microcavity (9), a wavelength selection reflection microcavity (10) and a scattering medium column (11). The two-dimensional square lattice structure photonic crystal 1 is a medium column type silicon photonic crystal which is periodically distributed along an X-Z plane. A row of medium columns are removed from the two-dimensional square lattice structure photonic crystal 1so as to form the single mode waveguide 1 (2), the single mode waveguide 2 (3), the single mode right angle waveguide 1 (4) and the single mode right angle waveguide 2 (5). The photonic crystal is moved up and down so as to form the multi-mode waveguide 1 (7) and the multi-mode waveguide 2 (8). The tapered gradual change waveguide (6) is between the single mode waveguide 1 (2) and the multi-mode waveguide 1 (7). The point defect microcavity (9), the wavelength selection reflection microcavity (10) and the scattering medium column (11) are circular medium columns.
Description
Technical field
The present invention is wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal and method, uses Two dimensional square lattice photon brilliant
Body, is integrated in wavelength-division multiplex and mode division multiplexing on a device, relates to the technical field of optic communication and optical information processing.
Background technology
Optical communication system develops to the direction of superelevation speed, vast capacity.Wavelength-division multiplex system, mode division multiplexing system at present
And polarisation multiplex system is used to improve message capacity.But single multiplex system is limited to the raising of capacity of communication system,
Propose wavelength-division mode division hybrid multiplex to improve message capacity further, and wavelength-division mode division hybrid multiplex/demultiplexer is
Primary Component in wavelength-division mode division hybrid multiplex system.
Photonic crystal has photon band gap and the characteristic of photon local, and lead-in defect forms waveguide in the photonic crystal, introduces point
Defect forms microcavity, point defect is combined with line defect and achieves wavelength-division multiplex.Simultaneously according to phase matched principle, by adjusting
The width of joint multimode waveguide achieves light wave basic mode (TE0) arrive First-Order Mode (TE1) conversion so that TE0Mould and TE1Mould is same
Time in multimode waveguide transmission realize mode division multiplexing.Wavelength-division mode division hybrid multiplex/demultiplexer volume based on photonic crystal
Little, it is easy to integrated.And function admirable, absorbance is high, and insertion loss is low, and channel interference is little, in high-speed high capacity communication system
System has important value.
Summary of the invention
Technical problem: it is an object of the invention to provide a kind of wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal and side
Method.By the impact on transmission spectrum of the structural parameters of analysis site defect microcavity, Wavelength selective reflective microcavity and scattering medium post,
Change point defect microcavity, Wavelength selective reflective microcavity and the radius of scattering medium post so that the transmitance of light wave increases.Pass through
The width changing multimode waveguide makes the light wave emergence pattern of different wave length change, single mode waveguide and the structure class of multimode waveguide composition
It is similar to asymmetric parallel waveguide, by regulating the coupling space between asymmetric parallel waveguide and length, mode conversion efficiency can be made to reach
To the highest.
Technical scheme: in order to adapt to ultrahigh speed, the development of vast capacity optical communication system, we have proposed a kind of brilliant based on photon
The wavelength-division mode division hybrid multiplex demultiplexer of body so that it is be operated in optical band, has the using value of reality.We use and a little lack
Fall into the structure that microcavity, Wavelength selective reflective microcavity and linear defect wave-guide combine, it is achieved the wavelength-division multiplex of 1550nm and 1310nm,
The structure of the asymmetric parallel waveguide simultaneously consisted of single mode waveguide and multimode waveguide achieves 1550nm and the base of 1310 nanometers
Mould is to the conversion of First-Order Mode, thus realizes mode division multiplexing.
A kind of based on photonic crystal the wavelength-division mode division hybrid multiplex demultiplexer of the present invention include Two dimensional square 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 post；Wherein, Two dimensional square lattice structure photon
Crystal is the medium column type silicon photonic crystal along X-Z plane periodic distribution；Two dimensional square lattice structure photonic crystal removes
One row's dielectric posts 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 light
Sub-crystal constitutes multimode waveguide one and multimode waveguide two；It is conical gradual change waveguide between single mode waveguide one and multimode waveguide one, single mode
Waveguide one, conical gradual change waveguide, multimode waveguide one and multimode waveguide two sequentially UNICOM is positioned in Two dimensional square lattice photonic crystal
On axis；Single mode waveguide two, single mode orthogonal wave-guide one, single mode orthogonal wave-guide two are positioned at the axis of Two dimensional square lattice photonic crystal
The side of line, point defect microcavity and Wavelength selective reflective microcavity, scattering medium post are circular media post.
The multiplexing of the wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal of the present invention demultiplexes method and is: during multiplexing,
The TE of 1550nm0Mould inputs from single mode waveguide one, enters multimode waveguide one through conical gradual change waveguide, eventually passes multimode waveguide
Two outputs；
The TE of 1310nm0Mould inputs from single mode waveguide two, consistent with the resonant frequency of point defect microcavity, is coupled into point defect microcavity
Entering single mode waveguide one to transmit, the effect through Wavelength selective reflective microcavity is transmitted to the right, passes sequentially through conical gradual change waveguide, many
Mould waveguide one, multimode waveguide two export；
The TE of 1550nm0Mould inputs from single mode orthogonal wave-guide one, through being coupled into mould waveguide one and being converted into TE1Mould, then
Export through multimode waveguide two；
The TE of 1310nm0Mould inputs through single mode orthogonal wave-guide two, through being coupled into multimode waveguide two and being converted into TE1
Mould exports；
During multiplexing, aforementioned four process is carried out simultaneously；The final TE having 1550nm at multimode waveguide two output port0、TE1
Mould and the TE of 1310nm0、TE1The signal output of four channels of mould, it is achieved thereby that wavelength-division mode division hybrid multiplex.
During demultiplexing, the TE of 1550nm0、TE1Mould and the TE of 1310nm0、TE1The signal of these four channels of mould simultaneously from
The right-hand member input of multimode waveguide two, exports the TE of 1550nm from single mode waveguide one and single mode orthogonal wave-guide one after demultiplexing0Mould；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 a kind of novel photonic crystal wavelength-division-mode division hybrid multiplex/demultiplexer, and the principle of multiplex/demultiplex is:
In photonic crystal, lead-in defect forms waveguide, introduces point defect and forms microcavity, point defect is combined with line defect and achieve ripple
Divide multiplexing.In the photonic crystal, according to phase matched principle, transmit TE0The propagation constant of the single mode waveguide of mould and transmission TE1
When the propagation constant of the multimode waveguide of mould is equal, through certain coupling distance, so that the TE of transmission in single mode waveguide0
Mode coupling is entered in multimode waveguide and is converted into TE1Mould is propagated, it is achieved that mode division multiplexing.The transmission channel of wavelength-division-mode division hybrid multiplex
Sum is together decided on by wavelength-division multiplex number and mode division multiplexing number, and it can transmit multiple wavelength, can transmit the multiple of each wavelength simultaneously
Pattern.The photonic crystal wavelength-division mode division hybrid multiplex/demultiplexer of present invention design achieves 1550nm and 1310nm two
The multiplexing of individual wavelength, can transmit the TE of two wavelength simultaneously0Mould and TE1Mould, is the structure of 2 × 2, altogether realizes four letters
The transmission of road signal.Demultiplex identical with the principle of multiplexing, be the inverse process of multiplexing.
Beneficial effect: the present invention devises a kind of wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal and method, at light
In sub-crystal, lead-in defect forms waveguide, introduces point defect and forms microcavity, point defect is combined with line defect and achieve wavelength-division
Multiplexing.Simultaneously according to phase matched principle, achieve light wave basic mode (TE by the width of regulation multimode waveguide0) arrive First-Order Mode (TE1)
Conversion so that TE0Mould and TE1Mould transmits in multimode waveguide simultaneously and realizes mode division multiplexing.By wavelength-division multiplex and mode division multiplexing collection
In Cheng Yi device, reduce device size, reduce coupling loss, and substantially increase the capacity of communication system.
Accompanying drawing explanation
Fig. 1 is the structure chart of the wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal of the present invention, has: two dimension is just in figure
Prismatic crystal lattice 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
Dielectric posts 11.
When Fig. 2 (a) is multiplexing, the TE of 1550nm0Mould time domain steady-state response figure when single mode waveguide one inputs, Fig. 2 (b)
For corresponding stable state field intensity map.
When Fig. 3 (a) is multiplexing, the TE of 1310nm0Mould time domain steady-state response figure when single mode waveguide two inputs, Fig. 3 (b)
For corresponding stable state field intensity map.
When Fig. 4 (a) is multiplexing, the TE of 1550nm0Mould time domain steady-state response figure when single mode orthogonal wave-guide one inputs, Fig. 4
B () is corresponding stable state field intensity map.
When Fig. 5 (a) is multiplexing, the TE of 1310nm0Mould time domain steady-state response figure when single mode orthogonal wave-guide two inputs, Fig. 5
B () is corresponding stable state field intensity map.
When Fig. 6 is for demultiplexing, the TE of 1550nm0Mould time domain steady-state response figure when multimode waveguide two inputs.
When Fig. 7 is for demultiplexing, the TE of 1310nm0Mould time domain steady-state response figure when multimode waveguide two inputs.
When Fig. 8 is for demultiplexing, the TE of 1550nm1Mould time domain steady-state response figure when multimode waveguide two inputs.
When Fig. 9 is for demultiplexing, the TE of 1310nm1Mould time domain steady-state response figure when multimode waveguide two inputs.
Detailed description of the invention
In order to adapt to the development of the optical communication system of superelevation speed, vast capacity, the present invention proposes a kind of based on photonic crystal
Wavelength-division mode division hybrid multiplex demultiplexer and method, meet the requirement of high Capacity Communication System, has the using value of reality.This
Invention uses the structure with Wavelength selective reflective microcavity to realize wavelength-division multiplex, is similar to asymmetric parallel waveguide by employing simultaneously
Structure achieve patten transformation, thus realize mode division multiplexing, both being combined achieves the TE of 1310nm, 1550nm0
Mould and TE1The wavelength-division of mould-mode division hybrid multiplex and demultiplexing, and transmitance is above 90%, and channel interference is below-13dB.
A kind of based on photonic crystal the wavelength-division mode division hybrid multiplex demultiplexer that the present invention provides, including Two dimensional square lattice photon
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 post；Wherein, Two dimensional square lattice
Structure photonic crystal is the medium column type silicon photonic crystal along X-Z plane periodic distribution；Brilliant at Two dimensional square lattice structure photon
Body removes row's dielectric posts and 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 it is conical gradual change ripple between single mode waveguide one and multimode waveguide one
Lead；Point defect microcavity and Wavelength selective reflective microcavity, scattering medium post are circular media post.
Design parameter is: lattice paprmeter a=0.54 μm, dielectric posts radius r=0.09 μm, and point defect microcavity and wavelength select anti-
Penetrate the radius r of microcavity ,=0.2246 μm, scattering medium column radius annular r1=0.074 μm, the width of multimode waveguide one
W1=3.66a, the width W of multimode waveguide two2=3.88a, the width W=2a of all single mode waveguides.
The principle of the wavelength-division mode division hybrid multiplex demultiplexer of this photonic crystal is as follows: lead-in defect forms ripple in the photonic crystal
Lead, introduce point defect and form point defect microcavity, produce Defect Modes, can couple when incident optical wavelength is with Defect Modes consistent wavelength
Enter point defect and propagated by line defect.It has been simultaneously introduced Wavelength selective reflective microcavity in the photonic crystal so that incident illumination simultaneously
Wave energy is transmitted in the waveguide according to ideal path and has higher absorbance, and according in good time coupled mode theory, point of adjustment defect is micro-
Chamber and the distance of Wavelength selective reflective microcavity so that transmitance is 1.The present invention utilizes the structure with wavelength reflection microcavity to realize
Wavelength-division multiplex.In the photonic crystal, as transmission TE0The propagation constant of the single mode waveguide of mould and transmission TE1The multimode waveguide of mould
Propagation constant equal time, through certain coupling distance, so that the TE of transmission in single mode waveguide0Multimode is entered in mode coupling
In waveguide and be converted into TE1Mould is propagated.The present invention can realize different wave length TE by the width of regulation multimode waveguide0Mould is to TE1
The patten transformation of mould.Single mode waveguide and multimode waveguide composition are similar to that asymmetric parallel waveguide, asymmetric flat by regulation
Coupling space between row waveguide and length, can make mode conversion efficiency reach the highest.The transmission channel of wavelength-division-mode division hybrid multiplex is total
Number is together decided on by wavelength-division multiplex number and mode division multiplexing number, and it can transmit multiple wavelength, can transmit multiple moulds of each wavelength simultaneously
Formula.Present invention achieves the multiplexing of two wavelength of 1550nm and 1310nm, the TE of two wavelength can be transmitted simultaneously0Mould and TE1
Mould, is 2 × 2 structures, altogether realizes the transmission of four channel signals.Demultiplex identical with the principle of multiplexing, be multiplexing
Inverse process.
The work process of the wavelength-division mode division hybrid multiplex demultiplexer of this photonic crystal is as follows:
(1) during multiplexing, the TE of 1550nm0Mould inputs from single mode waveguide one, enters multimode waveguide one through conical gradual change waveguide,
Eventually pass multimode waveguide two output；The TE of 1310nm0Mould inputs from single mode waveguide two, with the resonant frequency one of point defect microcavity
Causing, be coupled into point defect microcavity and enter single mode waveguide one transmission, the effect through Wavelength selective reflective microcavity is transmitted to the right, successively
Exported by conical gradual change waveguide, multimode waveguide one, multimode waveguide two；The TE of 1550nm0Mould inputs from single mode orthogonal wave-guide one,
Through being coupled into mould waveguide one and being converted into TE1Mould, then export through multimode waveguide two；The TE of 1310nm0Mould is through single
Mould orthogonal wave-guide two inputs, through being coupled into multimode waveguide two and being converted into TE1Mould exports；Final defeated at multimode waveguide two
Go out port and have the TE of 1550nm0、TE1Mould and the TE of 1310nm0、TE1The signal output of four channels of mould, it is achieved that
Wavelength-division mode division hybrid multiplex.
(2) during demultiplexing, the TE of 1550nm0、TE1Mould and the TE of 1310nm0、TE1The signal of these four channels of mould is same
Time input from the right-hand member of multimode waveguide two, export 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 wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal, it is characterised in that the wavelength-division mode division hybrid multiplex demultiplexer of this photonic crystal includes 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 post (11)；Wherein, Two dimensional square lattice structure photonic crystal (1) is the medium column type silicon photonic crystal along X-Z plane periodic distribution；In Two dimensional square lattice structure photonic crystal (1), remove row's dielectric posts constitute 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)；Being conical gradual change waveguide (6) between single mode waveguide one (2) and multimode waveguide one (7), single mode waveguide one (2), conical gradual change waveguide (6), multimode waveguide one (7) and multimode waveguide two (8) sequentially UNICOM are positioned on the axis 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 positioned at the side of the axis of Two dimensional square lattice photonic crystal (1), and point defect microcavity (9) and Wavelength selective reflective microcavity (10), scattering medium post (11) are circular media post.
2. the multiplexing of a wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal as claimed in claim 1 demultiplexes method, it is characterised in that during multiplexing, the TE of 1550nm0Mould inputs from single mode waveguide one (2), enters multimode waveguide one (7) through conical gradual change waveguide (6), eventually passes multimode waveguide two (8) output；
The TE of 1310nm0Mould inputs from single mode waveguide two (3), consistent with the resonant frequency of point defect microcavity (9), it is coupled into point defect microcavity (9) and enters single mode waveguide one (2) transmission, effect through Wavelength selective reflective microcavity (10) is transmitted to the right, passes sequentially through conical gradual change waveguide (6), multimode waveguide one (7), multimode waveguide two (8) output；
The TE of 1550nm0Mould inputs from single mode orthogonal wave-guide one (4), through being coupled into mould waveguide one (7) and being converted into TE1Mould, then export through multimode waveguide two (8)；
The TE of 1310nm0Mould inputs through single mode orthogonal wave-guide two (5), through being coupled into multimode waveguide two (8) and being converted into TE1Mould exports；
During multiplexing, aforementioned four process is carried out simultaneously；The final TE having 1550nm at multimode waveguide two (8) output port0、TE1Mould and the TE of 1310nm0、TE1The signal output of four channels of mould, it is achieved thereby that wavelength-division mode division hybrid multiplex.
The multiplexing of wavelength-division mode division hybrid multiplex demultiplexer based on photonic crystal the most according to claim 2 demultiplexes method, it is characterised in that during demultiplexing, the TE of 1550nm0、TE1Mould and the TE of 1310nm0、TE1The signal of these four channels of mould inputs from the right-hand member of multimode waveguide two (8) simultaneously, exports the TE of 1550nm after demultiplexing from single mode waveguide one (2) and single mode orthogonal wave-guide one (4)0Mould；Single mode waveguide two (3) and the TE of single mode orthogonal wave-guide two (5) output 1310nm0Mould；It is demultiplexing as the inverse process of multiplexing.
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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 |
| CN108061927A (en) * | 2017-11-09 | 2018-05-22 | 南京邮电大学 | A kind of photonic crystal wavelength-division mould divides hybrid multiplex demultiplexer and method |
| CN114019604A (en) * | 2022-01-06 | 2022-02-08 | 浙江大学 | Small-sized wavelength division demultiplexing-multiplexing device |
| CN116299864A (en) * | 2023-05-18 | 2023-06-23 | 之江实验室 | Method for optimizing parameters of mode division multiplexing design area, multiplexing/demultiplexing device and system |
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