CN103905139B - Reconfigurable add-drop multiplexer and signal add drop multiplexing method - Google Patents
Reconfigurable add-drop multiplexer and signal add drop multiplexing method Download PDFInfo
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Abstract
The invention relates to a reconfigurable add-drop multiplexer and a signal add drop multiplexing method. The multiplexer comprises a first photonic crystal and a second photonic crystal made from magneto-optic material columns. A third photonic crystal is arranged between the first photonic crystal and the second photonic crystal. A unidirectional waveguide is formed between the third photonic crystal and the first photonic crystal and between the third photonic crystal and the second photonic crystal. The middle portion of the third photonic crystal is provided with a single-mode defect cavity formed through the magneto-optic material column. The multiplexer further comprises a magnetic field generator for generating a control magnetic field applied onto the first photonic crystal, the second photonic crystal and the single-mode defect cavity. The reconfigurable add-drop multiplexer and the signal add drop multiplexing method of the invention are implemented, by adjusting externally-added magnetic field parameters, the multiplexer can be used to perform uploading and downloading on signals of different frequencies in any channel, and the signal input and output port can be selected. The multiplexer is not provided with a movable component, advantages of simple design method, compact structure and reconfigurable working frequency can be realized, and the design principle meets the requirements of the next generation of intelligent optical network.
Description
Technical field
The present invention relates to photonic crystal field, more particularly, it relates to a kind of restructural of photon crystal structure point inserts multiple
The method for carrying out signal add drop multiplex with device and using photonic crystal.
Background technology
Reconfigurable add drop multiplex technology is a core technology of optical-fiber network of future generation.Photon crystal structure is right due to its
The constraint of light, regulating power are strong, and the related device structures that it makes are compact, flexible design, up to wavelength magnitude, meet device high
The integrated growth requirement of degree, thus make bifurcation multiplex apparatus using photonic crystal and be increasingly subject to people's attention.
The plane add drop multiplex wave filter of currently employed photonic crystal designs, is divided to by the species of coupler and is broadly divided into two
Kind, one kind is photon crystal micro cavity, and another kind is micro-loop structure.Propose photon crystal micro cavity structure first is masschusetts, U.S.A reason
The group of work, they propose two kinds of structures：Single-chamber coupler or two-chamber coupler.Wherein for single-chamber coupler, want to obtain
Good filtering performance, it is necessary to which, while exciting the symmetric degenerate mode of two differences of single-chamber, this sets for real material
Meter is complicated, difficult to realize；Relatively easy is two-chamber coupler design, and later researcher introduced reflecting mechanism (as selected
The reflection cavity of selecting property) method.But due to its filtering characteristic is consumingly subject to the phase-modulation between two-chamber, to designing and manufacturing
Requirement it is very high, therefore in recent years more researchs use the coupler of micro-loop structure.Although can in such structural theory
To reach very high filtration efficiency, but micro-loop structure also has the radiation loss and other restrictions that itself cannot be eliminated.In addition, if
The means of dynamic regulation are not carried out to coupler, above-mentioned add-drop multiplexer is once produced, fixed frequency can only be entered
Row add drop multiplex.
Conventional at present is the deflection that micro mirror is controlled using micro machine to the means that operating frequency is reconstructed, but its work
Skill is complicated, and yields is low, and due to there is moving parts, it is easy to wear, affect the life-span.In addition also using heating micro-loop, change
The methods such as liquid-crystal refractive-index realize the control method to microcavity resonant frequency.
The content of the invention
It is an object of the present invention to being directed to, existing add drop multiplex solution process is complicated, yields is low, and due to there is shifting
Dynamic component, it is easy to wear, the defect in life-span is affected, there is provided a kind of add-drop multiplexer that can be reconstructed, with by adjusting outfield, to institute
The frequency that need to be downloaded easily is reconstructed.
The scheme that the present invention solves the above problems is：A kind of restructural add-drop multiplexer is constructed, for coupled signal, including
First photonic crystal and the second photonic crystal, are provided with three-photon crystal between the first photonic crystal and the second photonic crystal, and first
The photonic crystal that photonic crystal and the second photonic crystal are made up of magneto-optic memory technique post；Three-photon crystal is non-magneto-optic memory technique post
The photonic crystal for being constituted；Three-photon crystal is formed with unidirectional respectively between the first photonic crystal, the second photonic crystal
The common waveguide of ripple performance, local waveguide, include a single mode defect being made up of magneto-optic memory technique post in three-photon crystal
Chamber, is the coupler between common waveguide and local waveguide, for coupling common waveguide in the signal for coupling cavity resonant frequency
To in local waveguide, and couple in local waveguide with couple the signal of cavity resonant frequency in common waveguide；Restructural point is inserted
Multiplexer also includes magnetic field generator, and for producing the first photonic crystal, the second photonic crystal and single mode defect cavity are applied to
Parallel to the control magnetic field of Z-direction, control magnetic field makes signal in common waveguide, local waveguide one way propagation, in single mode defect cavity
Carry out resonance coupling.
The restructural add-drop multiplexer of the present invention, the first photonic crystal and the second photonic crystal are square lattice dot matrix knot
Structure, three-photon crystal is the square of the square lattice dot matrix angle at 45 ° with the first photonic crystal, the second photonic crystal
Lattice lattice structure.
The restructural add-drop multiplexer of the present invention, what the first photonic crystal, the second photonic crystal and single mode defect cavity were used
Material is magneto-optic memory technique, including yttrium iron garnet or other magnet-optical mediums；The composition of three-photon crystal is non-magneto-optic memory technique, is wrapped
Include aluminium or other high-index materials.
The restructural add-drop multiplexer of the present invention, common waveguide is linear pattern waveguide, and local waveguide is located at for waveguide port
The fold-line-shaped waveguide of homonymy.
The present invention also provides a kind of signal add drop multiplex method, comprises the following steps：
S100, the first photonic crystal and the second photonic crystal are constituted by identical magneto-optic memory technique post periodic arrangement, according to work
Working frequency value determines the cycle of the magneto-optic memory technique post and size, and operating frequency is located in the forbidden band of photonic crystal；
S200, between the first photonic crystal and the second photonic crystal, introducing be made up of non-magneto-optic memory technique post the 3rd
Photonic crystal, according to operating frequency cycle and the column dimensions of the three-photon crystal are determined, it is brilliant that operating frequency is located at photon
In the forbidden band of body；The interface of the first photonic crystal, the second photonic crystal and three-photon crystal is respectively the public affairs of one way propagation
Waveguide and local waveguide altogether；
S300, the single mode defect cavity that operating frequency is equal in three-photon crystal center setting resonant frequency；
S400, the control magnetic for applying in the first photonic crystal, the second photonic crystal and single mode defect cavity parallel to Z-direction
, control magnetic field makes signal in common waveguide, local waveguide one way propagation, and in single mode defect cavity resonance coupling is carried out.
The signal add drop multiplex method of the present invention, the first photonic crystal and the second photonic crystal are square lattice dot matrix knot
Structure, three-photon crystal is the square of the square lattice dot matrix angle at 45 ° with the first photonic crystal, the second photonic crystal
Lattice lattice structure.
The signal add drop multiplex method of the present invention, what the first photonic crystal, the second photonic crystal and single mode defect cavity were used
Material is magneto-optic memory technique, including yttrium iron garnet or other magnet-optical mediums；The composition of three-photon crystal is non-magneto-optic memory technique, is wrapped
Include aluminium or other high-index materials.
The signal add drop multiplex method of the present invention, common waveguide is linear pattern waveguide, and local waveguide is located at for waveguide port
The fold-line-shaped waveguide of homonymy.
The signal add drop multiplex method of the present invention, with the magnetic field put in single mode defect cavity upper and lower information carrying number is controlled
Frequency.
Present invention also offers a kind of multi channel signals add-drop multiplexer, including multiple restructural add-drop multiplexing modules, it is many
Individual download one-way waveguide, multiple to upload one-way waveguide, the first photonic crystal of each signal add-drop multiplexing module, the second photon are brilliant
Body, three-photon crystal are mutually the same, and the size of single mode defect cavity is mutually the same, the common waveguide of each restructural add-drop multiplexer
A linear pattern waveguide is sequentially spliced into according to identical transmission direction.
Implement the restructural add-drop multiplexer and signal add drop multiplex method of the present invention, with following beneficial effect：It is logical
Overregulating additional magnetic field parameter enables multiplexer to carry out upper and lower load to the signal of different frequency in any passage, and
Optional signal input, output port., without moving parts, method for designing is simple, and compact conformation, operating frequency can be again for the multiplexer
Structure, design principle meets the demand of ASON of future generation.
Description of the drawings
Below in conjunction with Figure of description, the present invention will be described, wherein：
Fig. 1 is the principle assumption diagram of the present invention；
Fig. 2 is first embodiment structural representation；
Fig. 3 is the graph of a relation of the operating frequency with magnetic field intensity of single mode defect cavity of the present invention；
Fig. 4 is laser propagation effect figure of the first embodiment download signal to local port 321；
Fig. 5 is transmission curve of the first embodiment download signal to local port 321；
Fig. 6 is laser propagation effect figure of the first embodiment download signal to local port 322；
Fig. 7 is transmission curve of the first embodiment download signal to local port 322；
Fig. 8 is the laser propagation effect figure that first embodiment is multiplexed by the up-delivering signal of local port 321；
Fig. 9 is the laser propagation effect figure that first embodiment is multiplexed by the up-delivering signal of local port 322；
Figure 10 is second embodiment of the invention；
Figure 11 is the transmission curve of second embodiment；
Figure 12 a are that second embodiment downloads 4.64354 GHz signals to the laser propagation effect figure of first port；
Figure 12 b are that second embodiment downloads 4.64354 GHz signals to the laser propagation effect figure of second port；
Figure 12 c are that second embodiment downloads 4.66GHz signals to the laser propagation effect figure of the 3rd port；
Figure 12 d are that second embodiment downloads 4.66GHz signals to the laser propagation effect figure of the 4th port；
Figure 13 a are the laser propagation effect figure that second embodiment uploads 4.64354 GHz signals from first port；
Figure 13 b are the laser propagation effect figure that second embodiment uploads 4.64354 GHz signals from second port；
Figure 13 c are the laser propagation effect figure that second embodiment uploads 4.66GHz signals from the 3rd port；
Figure 13 d are the laser propagation effect figure that second embodiment uploads 4.66GHz signals from the 4th port；
Figure 14 is a multichannel restructural add-drop multiplexer architecture figure.
Specific embodiment
Below in conjunction with the drawings and specific embodiments and accompanying drawing, the present invention is described in detail.
Fig. 1 is the structure principle chart of restructural add-drop multiplexer of the present invention.The He of the first photon crystal 1 of add-drop multiplexer 00
Second photonic crystal 200, is provided with three-photon crystal 300, the first light between the first photon crystal 1 00 and the second photonic crystal 200
The photonic crystal that the photonic crystal 200 of sub- crystal 100 and second is made up of magneto-optic memory technique post；Three-photon crystal 300 respectively with
Common waveguide 310, local waveguide 320, three-photon crystal 300 are formed between the first photon crystal 1 00, the second photonic crystal 200
In include a single mode defect cavity 301 being made up of magneto-optic memory technique post, for carrying out signal filtering；Restructural add-drop multiplexer
Also include magnetic field generator, for producing the first photon crystal 1 00, the second photonic crystal 200 and single mode defect cavity 301 are applied to
On parallel to Z-direction control magnetic field, control magnetic field make signal in common waveguide 310, the one way propagation of local waveguide 320, in list
Mould defect cavity 301 carries out resonance coupling.
The first embodiment structural representation of restructural add-drop multiplexer of the present invention is illustrated in figure 2, in the present embodiment, can
Reconstruct add-drop multiplexer includes the first photon crystal 1 00, the second photonic crystal 200 and the three-photon crystalline substance being arranged between
Body 300, forms common waveguide 310 and sheet between the photon crystal 1 00 of three-photon crystal 300 and first, the second photonic crystal 200
Ground waveguide 320.First photon crystal 1 00, the second photonic crystal 200, three-photon crystal 300 are 2 D photon crystal, lead to
The pillar for crossing generation preiodic type arrangement in two-dimensional flat plate is formed.Two dimensional surface for XY institute in the plane.Second photonic crystal
The local waveguide 320 formed between 200 and three-photon crystal 300 forms half " returning " character form structure, i.e. linear pattern waveguide and passes through two
Secondary 90-degree bent, waveguide port is located at the fold-line-shaped waveguide of homonymy.So, it is applied on the second photonic crystal 200 by adjustment
Magnetic direction, it becomes possible to which which port outgoing selection is coupled to the electromagnetic wave of local waveguide 320 from.Due to of the present invention
One-way transmission mould is insensitive to the defect such as turn round, and in the present embodiment, waveguide uses the structure of half " returning " font, actually makes
With in as needed, this structure also can be optimized and revised.
In the present embodiment, the first photon crystal 1 00 and the second photonic crystal 200 are yttrium iron garnet (Yttrium
Iron Garnet, YIG) photonic crystal that post is constituted, it is square lattice lattice structure, radius is a1It is=4.0 millimeters, brilliant
Lattice constant is r1=36.8 millimeters, dielectric constant is 15 ε0(ε0For permittivity of vacuum).Three-photon crystal 300 is aluminium (Al)
The photonic crystal that pillar is constituted, is also square lattice lattice structure, with the first photonic crystal, the pros of the second photonic crystal
Shape lattice dot matrix angle at 45 °.Lattice paprmeter r3=26.0 millimeters, radius is a2=3.9 millimeters, dielectric constant is taken as 10 ε0。
In three-photon crystal 300, on the position of common waveguide 310 and the equal length of local waveguide 320, arrange by YIG materials
The cylinder that material is constituted, forms single mode defect cavity 301, and the radius of single mode defect cavity 301 is a3=1.8 millimeters.
The concrete size of the present embodiment is these are only, when for different transmission signals, above-mentioned a1, a2,a3,r1, r3
Change etc. specific numerical value adaptability.
In the present embodiment, the signal of propagation is mainly the frequency signal of 4GHz to 5GHz, a1Can suitably select 3.5～
4.5 millimeter；r135.0～40.0 millimeters can suitably be selected；r3May correspond to r1Select 24.7～28.3 millimeters；Single mode defect cavity
301 radius can suitably select 1.5～2.5 millimeters.Required may be selected according to the operating frequency range of restructural add-drop multiplexer
Concrete different size.
In order that the signal transmitted in common waveguide 310 and local waveguide 320 is controlled, the restructural of the present embodiment
Add-drop multiplexer also includes magnetic field generator, and the magnetic fields that magnetic field generator is produced are in the first photon crystal 1 00, the second photon
On crystal 200 and single mode defect cavity 301, specifically, the size in magnetic field is controlled in single mode defect cavity 301, can be realized to difference
The filtering of frequency signal, and be+Z or-Z (vertical papers in the direction in the first photon crystal 1 00, the magnetic field of the second photonic crystal 200
Outwards or inwards), the signal propagated in can making common waveguide 310 and local waveguide 320 by change magnetic direction is along different
Direction carries out one way propagation.
From Fig. 1 and Fig. 2, if the plane projection that the common waveguide 310 is determined with the local waveguide 320 is extremely
On paper, the common waveguide 310 is located at the top of the local waveguide 320, and the first of the common waveguide 310 on paper
On the left side, on the right, then +Z direction is the outside side of vertical paper to the second port 312 of the common waveguide 310 for port 311
To -Z direction is vertical paper direction inwards.
The corresponding relation of concrete magnetic direction and directions of signal flow is as shown in table 1:
Table 1
| First photon crystal 1 00 | Second photonic crystal 200 | Signal input port | Signal output port |
| -Z | -Z | 311 | 321 |
| -Z | +Z | 311 | 322 |
| -Z | +Z | 321 | 312 |
| -Z | -Z | 322 | 312 |
In addition, the direction in above-mentioned magnetic field is the result that correspondence the present embodiment selects YIG materials and specific dimensions, at other
Magneto-optic memory technique, concrete size in, needs recalculate or according to experiment determine one-way waveguide guided wave direction and magnetic direction
Corresponding relation, to redefine magnetic direction.
Select to arrange signal source (Source) at common waveguide input 311, signal source produces the signal of multiple frequencies
ω 1, ω 2 ... ω n, transmit along common waveguide 310, and the magnetic field that direction is-Z is applied at the first photon crystal 1 00, can by upper table
Know, the signal in common waveguide can only be propagated from common waveguide input 311 to common waveguide output end 312.
The resonant frequency of single mode defect cavity 301 and the relation of externally-applied magnetic field can be obtained by energy band and simulation calculation, such as
Shown in Fig. 3.Wherein, round dot is the data that transmission spectrum is calculated, and side's point is the data of energy band analysis.Knowable to two curves of Fig. 3,
Two sets of results are almost coincide.The operating characteristic of single mode defect cavity 301 can directly be measured by transmission experiment in practical application.According to this
Bar curve, by the available magnetic field intensity that should be applied in single mode defect cavity 301 of the frequency for needing filtering.
With reference to the first embodiment of the present invention, when the signal of the input input different frequency in common waveguide, and singly
During Oe (oersted) of magnetic field intensity 1000 in mould defect cavity 301, if it is-Z's to apply direction on the second photonic crystal 200
Magnetic field, then can obtain transmission spectrum as shown in Figure 5 at local waveguide output end 321；And when applying on the second photonic crystal 200
When magnetic direction is+Z, then transmission spectrum as shown in Figure 7 can be obtained at local waveguide output end 322.The transmission spectrum of Fig. 5 and Fig. 7
The centre frequency for all showing coupled signal is 4.68735 GHz, the as resonant frequency of single mode defect cavity 301.
Increase signal source 400 in one end of common waveguide 310, be 4.68735 GHz letters to the frequencies of propagation of common waveguide 310
Number when, if applying the magnetic field that direction is-Z on the second photonic crystal 200, signal will export from local waveguide port 321,
Signal communication effect is as shown in Figure 4.In the diagram, different gray scales is represented in the power of time-ofday signals Strength Space distribution of taking pictures.
When the magnetic direction applied on the second photonic crystal 200 is+Z, the guided wave direction in local waveguide 320 will change therewith, because
This signal can only be exported from port 322.Electromagnetic wave propagation effect is as shown in Figure 6.
Example is propagated from the concrete signal of Fig. 4-Fig. 7 to can be seen that in signal " demultiplexing " process, can using the present invention
Easily by changing the magnetic field size being applied in single mode defect cavity 301, so as to select the download signal of different frequency, gram
Having taken not reconfigurable each passage of demultiplexing device can only demultiplex the defect of certain CF.The is applied to by changing
Magnetic direction on two photonic crystals 200, it is also an option that the signal that " demultiplexing " is obtained is from which signal port output.
And during signal multiplexing, as shown in Figure 8 and Figure 9, signal to be multiplexed is from the port of local waveguide 320
321 or 322 inputs.If the signal frequency that signal source 400 is produced is 4.68735 GHz, and causes single mode defect cavity according to Fig. 3
When magnetic field intensity on 301 is 1000 Oe, signal to be multiplexed will be coupled to common waveguide.
It is as shown in Figure 10 another embodiment of the present invention, is a two-channel photon crystal restructural add-drop multiplexer.
Apply the magnetic field of varying strength respectively in the single mode defect cavity corresponding to two passages, it is possible to achieve different in two passages
The multiplex/demultiplex of frequency signal.For example, when applying the 0e's of intensity 975 and 985 0e respectively in left and right single mode defect cavity
External magnetic field (is numbered the defect cavity plus 975 0e of 301a, be numbered the defect cavity plus 985 0e of 301b), and each port is corresponding
Penetrate spectral line as shown in figure 11.The output center frequency that can be seen that left and right two passages from the transmission spectral line is respectively
4.64354 GHz and 4.66GHz.Furthermore it is possible to see the isolation of two passages or good, signal is without mutually dry
Disturb.
Specifically, carrier wave RST can refer to shown in Figure 12 a～Figure 12 d under different passages, different port.Wherein scheme
12a and Figure 12 b be left passage download frequency be 4.64354 GHz signals (demultiplexing) situations；Figure 12 c and Figure 12 d are on the right side
Passage download frequency is the situation of 4.66 GHz signals.
When the external magnetic field of the 0e of intensity 975 and 985 0e is applied respectively in left and right two single mode defect cavities, due to applying
Plus the 0e of intensity 975 can make left single mode defect cavity have the resonant frequency of 4.64354 GHz, apply the 0e energy of magnetic field intensity 985
Enough make right single mode defect cavity that there is the resonant frequency of 4.66 GHz；Therefore the signal of 4.64354 GHz will be downloaded to left passage,
And the signal of 4.66 GHz will be downloaded to right passage.With reference to table 1, by adjusting the magnetic direction in passage, can obtain as
The design sketch that Figure 12 a-12d are downloaded in different port.
When needing the signal by different frequency to upload in common waveguide 310 (signal multiplexing), then take with Figure 12 a～
Figure 12 d contrary process：The electromagnetic wave of different frequency is input into from local waveguide, in again being coupled to common waveguide.It is specific to propagate
The design sketch of electromagnetic wave is as shown in Figure 13 a～Figure 13 d.
Figure 12 a～12d and Figure 13 a～13d provides the concrete condition of two-channel photon crystal restructural add-drop multiplexer,
More multichannel photonic crystal restructural add-drop multiplexer is as shown in figure 14, as long as in the single mode defect cavity corresponding to different passages
It is upper to apply different size of magnetic field, the magnetic field of different directions is applied on the second photonic crystal, you can realize the letter of multiple frequencies
Number multiplex/demultiplex, and input, the selection of output port.
In all embodiments more than, the first photon crystal 1 00, the second photonic crystal 200, three-photon crystal 300
Tetragonal structure is used, in actual use, it is also possible to use triangular lattice structure or other lattice structures instead, only
The common waveguide 310 to be formed, local 320 waveguide can one-way transmission electromagnetic wave signal, single mode defect cavity 301 can couple electricity
Magnetic wave.
These are only the specific embodiment of the invention, it is impossible to the scope of the present invention is limited with this, in the art
The impartial change that those skilled in the art are made according to the present invention, and change known to those skilled in that art, all should still belong to
The scope that the present invention covers.
Claims (7)
1. a kind of restructural add-drop multiplexer, including the first photonic crystal (100) and the second photonic crystal (200), its feature exists
In, three-photon crystal (300) is provided between first photonic crystal (100) and the second photonic crystal (200), the first photon is brilliant
The photonic crystal that body (100) and the second photonic crystal (200) are made up of magneto-optic memory technique post, three-photon crystal is non-magnetic finish
The photonic crystal that stock column is constituted；The three-photon crystal (300) is brilliant with the first photonic crystal (100), the second photon respectively
The common waveguide (310) with unidirectional guided wave performance and local waveguide (320), three-photon crystal (300) are formed between body (200)
In include single mode defect cavity (301), single mode defect cavity include a magneto-optic memory technique post, be common waveguide (310) and local waveguide
(320) coupler between, for coupling common waveguide (310) in couple the signal of cavity resonant frequency to local waveguide
(320) in, and couple in local waveguide (320) with couple the signal of cavity resonant frequency in common waveguide (310)；It is described can
Reconstruct add-drop multiplexer also includes magnetic field generator, is that the first photonic crystal (100), the second photonic crystal (200) and single mode lack
Sunken chamber (301) provides magnetic field；
The common waveguide (310) is linear pattern waveguide, and the local waveguide (320) is to be located at the second photonic crystal (200)
The fold-line-shaped waveguide of homonymy；
When carrying out signal download, when signal is input into by the common waveguide (310) first port (311), single mode described in signal Jing
(301) control the magnetic field being applied on second photonic crystal (200) coupled to the local waveguide (320) in defect cavity
Direction is+Z, then signal is exported by the local waveguide (320) second port (322)；It is brilliant that control is applied to second photon
Magnetic direction on body (200) is-Z, then signal is exported by the local waveguide (320) first port (321)；
When carrying out signal upload, when signal is input into by the local waveguide (320) first port (321), adjustment is applied to described
Magnetic direction on second photonic crystal (200) is+Z, and (301) are coupled to the public ripple in single mode defect cavity described in signal Jing
(310) are led, is exported by the common waveguide (310) second port (312)；When signal is by the end of the local waveguide (320) second
Mouth (322) input, adjustment is applied to the magnetic direction on second photonic crystal (200) for-Z, coupler described in signal Jing
(301) coupled to the common waveguide (310), exported by the common waveguide (310) second port (312)；
If the plane orthographic projection that the common waveguide (310) is determined with the local waveguide (320) is to paper, on paper
The common waveguide (310) is positioned at the top of the local waveguide (320), and the first port of the common waveguide (310)
(311) on the left side, on the right, then +Z direction is the outside side of vertical paper to the second port (312) of the common waveguide (310)
To -Z direction is vertical paper direction inwards；
The magnetic field intensity in single mode defect cavity (301) is put on by adjustment and controls the frequency of up-delivering signal and the frequency of download signal
Rate.
2. restructural add-drop multiplexer according to claim 1, it is characterised in that first photonic crystal (100) and
Second photonic crystal (200) is square lattice lattice structure, three-photon crystal (300) be with the first photonic crystal, second
The square lattice lattice structure of the square lattice dot matrix angle at 45 ° of photonic crystal.
3. restructural add-drop multiplexer according to claim 1, it is characterised in that first photonic crystal (100),
Material in two photonic crystals (200) and single mode defect cavity (301) is yttrium iron garnet；Jie in three-photon crystal (300)
Matter post is aluminium.
4. a kind of multi channel signals add-drop multiplexer, it is characterised in that including it is multiple as described in arbitrary in claim 1-3 can
Reconstruct add-drop multiplexer, multiple download one-way waveguides are multiple to upload one-way waveguide, the first light of each restructural add-drop multiplexer
Sub- crystal, the second photonic crystal, three-photon crystal are mutually the same, and the size of single mode defect cavity is mutually the same, each restructural point
The common waveguide of insert multiplexer is sequentially spliced into a linear pattern waveguide according to identical transmission direction.
5. a kind of signal add drop multiplex method, it is characterised in that comprise the following steps：
S100, the first photonic crystal and the second photonic crystal are constituted by identical magneto-optic memory technique post periodic arrangement, according to work frequency
Rate value determines the cycle of the magneto-optic memory technique post and size, and operating frequency is located in the forbidden band of photonic crystal；
S200, between the first photonic crystal and the second photonic crystal, introducing is made up of non-magneto-optic memory technique post periodic arrangement
Three-photon crystal, according to operating frequency cycle and the column dimensions of the three-photon crystal are determined, operating frequency is located at light
In the forbidden band of sub- crystal；The interface of the first photonic crystal, the second photonic crystal and three-photon crystal is respectively one way propagation
Common waveguide and local waveguide；
S300, the single mode defect cavity that operating frequency is equal in three-photon crystal center setting resonant frequency；
S400, the control magnetic field for applying in the first photonic crystal, the second photonic crystal and single mode defect cavity parallel to Z-direction,
Control magnetic field makes signal one way propagation in common waveguide, local waveguide, and in single mode defect cavity resonance coupling is carried out；
The common waveguide (310) is linear pattern waveguide, and the local waveguide (320) is to be located at the second photonic crystal (200)
The fold-line-shaped waveguide of homonymy；
Step S400 includes：
When carrying out signal download, when signal is input into by the common waveguide (310) first port (311), single mode described in signal Jing
Defect cavity (301) is applied to the magnetic field side on second photonic crystal (200) coupled to the local waveguide (320), control
To for+Z, then signal is exported by the local waveguide (320) second port (322)；Control is applied to second photonic crystal
(200) magnetic direction on is-Z, then signal is exported by the local waveguide (320) first port (321)；
When carrying out signal upload, when signal is input into by the local waveguide (320) first port (321), adjustment is applied to described
Magnetic direction on second photonic crystal (200) is+Z, and single mode defect cavity (301) is coupled to the common waveguide described in signal Jing
(310), exported by the common waveguide (310) second port (312)；When signal is by local waveguide (320) second port
(322) it is input into, adjustment is applied to the magnetic direction on second photonic crystal (200) for-Z, single mode defect described in signal Jing
Chamber (301) is exported coupled to the common waveguide (310) by the common waveguide (310) second port (312)；
If the plane orthographic projection that the common waveguide (310) is determined with the local waveguide (320) is to paper, on paper
The common waveguide (310) is positioned at the top of the local waveguide (320), and the first port of the common waveguide (310)
(311) on the left side, on the right, then +Z direction is the outside side of vertical paper to the second port (312) of the common waveguide (310)
To -Z direction is vertical paper direction inwards；
The magnetic field intensity in single mode defect cavity (301) is put on by adjustment and controls the frequency of up-delivering signal and the frequency of download signal
Rate.
6. signal add drop multiplex method according to claim 5, it is characterised in that the first photonic crystal and the second photon are brilliant
The structure of body is square lattice lattice structure, and three-photon crystal is the pros with the first photonic crystal, the second photonic crystal
The square lattice lattice structure of shape lattice dot matrix angle at 45 °.
7. signal add drop multiplex method according to claim 5, it is characterised in that the first photonic crystal, the second photonic crystal
It is yttrium iron garnet with the material that single mode defect cavity is used；The material that three-photon crystal is used is aluminium.
Priority Applications (1)
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| CN105572918B (en) * | 2016-02-15 | 2021-02-19 | 深圳大学 | Magnetic control alternative optical path switch based on photonic crystal cross waveguide |
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| CN1400749A (en) * | 2001-08-08 | 2003-03-05 | 中国科学院物理研究所 | New-type photon crystal wavelength division multiplex device |
| CN1996682A (en) * | 2006-08-31 | 2007-07-11 | 欧阳征标 | Two-dimensional photon crystal micro resonance cavity |
| CN101533126A (en) * | 2009-04-20 | 2009-09-16 | 中山大学 | Photonic crystal wavelength division multiplexer and design method thereof |
| CN102262267A (en) * | 2011-05-21 | 2011-11-30 | 浙江工业大学 | High-efficiency channel drop filter based on photonic crystal non-commutative unidirectional waveguide |
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| CN1400749A (en) * | 2001-08-08 | 2003-03-05 | 中国科学院物理研究所 | New-type photon crystal wavelength division multiplex device |
| CN1996682A (en) * | 2006-08-31 | 2007-07-11 | 欧阳征标 | Two-dimensional photon crystal micro resonance cavity |
| CN101533126A (en) * | 2009-04-20 | 2009-09-16 | 中山大学 | Photonic crystal wavelength division multiplexer and design method thereof |
| CN102262267A (en) * | 2011-05-21 | 2011-11-30 | 浙江工业大学 | High-efficiency channel drop filter based on photonic crystal non-commutative unidirectional waveguide |
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| Unidirectional channel-drop filter by one-way gyro magnetic photonic crystal waveguides;Jin-Xin Fu, Jin Lian, Rong-Juan Liu, Lin Gan, Zhi-Yuan Li;《APPLIED PHYSICS LETTERS 98,211104》;20110323;第 211104-1-211104-3页，图5-6 * |
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