CN101533126A - Photonic crystal wavelength division multiplexer and design method thereof - Google Patents
Photonic crystal wavelength division multiplexer and design method thereof Download PDFInfo
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Abstract
The invention relates to a photonic crystal wavelength division multiplexer and a design method thereof. The design method comprises the following steps: (1) a cylindrical air column with radius of r arranged in triangular lattice is introduced into a two-dimensional plate composed of waveguide materials to form a two-dimensional photonic crystal; (2) the air columns on at least two lines are removed from the two-dimensional plate so as to form at least two linear defects, an input waveguide and at least an output waveguide, and air columns of odd-numbered lines not less than 7 are reserved between the input waveguide and the output waveguide; (3) resonant cavities with resonant modes in odd and even symmetry are constructed in the reserved air columns. The operating wavelength can be adjusted by changing structural parameters or lattice constants of the resonant cavities; wavelength division multiplexers with arbitrary multi-path download channel number can be manufactured by arranging certain resonant cavities and wave guides. The download bandwidth of the invention is less than 0.5nm and can be applied to dense wavelength division multiplex systems with wavelength interval standard of 0.8nm.
Description
Technical field
The present invention relates to a kind of wavelength division multiplex device technology of optical band, particularly relate to the photon crystal wavelength division multiplex device and the method for designing thereof that are applicable to the 1550nm wave band.
Background technology
In optical fiber communication, wavelength-division multiplex (WDM) technology is the multiplexing technique of using always, is a technology transmitting a plurality of wavelength light signals in an optical fiber simultaneously.Utilize Wavelength Division Multiplexing (WDM) device that the signal of different channels is modulated into the light of different wave length, and be multiplexed on the fiber channel, thus the dilatation of realization network.The dilatation effect of wavelength-division multiplex technique is remarkable, and lays the time ratio at network and be easier to and make things convenient for, and therefore becomes the emphasis of optical communication development.
Photonic crystal is the material that a class has the space periodicity dielectric structure, when its cycle and light wavelength at the same order of magnitude, the propagation of light wave in photonic crystal can be described with the light sub band structure, and the light wave of frequency in forbidden photon band can not be propagated in photonic crystal.And when in photonic crystal, introducing defective, then may in photonic band gap structure, form defect state, such photonic crystal just can be as making wavelength division multiplex device.Photon crystal wavelength division multiplex device is little because of its volume, the high interest that causes the researcher of efficient.1998, people such as Fan propose (S.Fan, P.R.Villenuve and J.D.Joannopoulos, channel by the local attitude is downloaded tunnelling, physical comment bulletin, volume was 960 pages in 1998 80) in four port double wave guiding systems of photonic crystal, introduce two identical resonator cavitys of structure, thus form wavelength division multiplex device.
Afterwards, people further propose to introduce the single resonator cavity with odd even symmetric mode and realize the wavelength-division multiplex function, thereby have improved the integrated level of device.Adopt single resonator cavity wavelength division multiplex device structure as shown in Figure 1, there is a resonator cavity between photon crystal wave-guide 1-2 and the 3-4, as light signal when port one enters waveguide 1-2, resonator cavity can be that the separate optical signals of the very narrow bandwidth of resonator cavity resonance wavelength is come out with centre wavelength wherein, download among the waveguide 3-4, from port 3 or port 4 outputs.Repeat this process, then can from waveguide 1-2, separate wavelength optical signals fully, thus the function of realization wavelength division multiplex device.A kind of wavelength division multiplex device (Zexuan Qiang and WeidongZhou that structure among Fig. 2 (a) comes to this, on the light based on the photonic crystal ring resonator/the download wave filter, optics letter, volume was 1823 pages in 2007 15): photon crystal structure is the medium post formation that square dot matrix is arranged, and background is an air; Cavity resonator structure serve as reasons the annular the formed ring cavity of dielectric rod defective, shown in the annular arrow among Fig. 2 A; The normalized power spectral line of its B, C, three exit ports of D is shown in Fig. 2 B.Single resonator cavity is the wavelength division multiplex device of this structure, and it is nearly 100% that coupling efficiency can reach in theory, but Q value (being quality factor) can only reach about 1000, and the download signal bandwidth is about 1.5nm, and the integrated level of device is not high.And this structure with dielectric rod as lattice structure, this is difficult the making on engineering.
Summary of the invention
Not high for the existing Q value of wavelength division multiplex device that solves existing single cavity resonator structure, integrated level is low, be difficult to technical matters such as making, primary and foremost purpose of the present invention is to provide a kind of photon crystal wavelength division multiplex device method for designing; This method is easy to realize, the designed wavelength division multiplex device that comes out has the advantage of high Q value, high integration.
Another object of the present invention is to provide a kind of photon crystal wavelength division multiplex device.
Primary and foremost purpose of the present invention is achieved in that a kind of method for designing of photon crystal wavelength division multiplex device, it is characterized in that may further comprise the steps: (1) introduces the cylindrical air column that dot matrix triangular in shape is arranged in the two-dimensional flat plate that is made of waveguide materials, constituting grating constant is the 2 D photon crystal of a, and the air column radius is r; (2) remove in the two-dimensional flat plate air column at least two lines, constitute at least two line defects, form an input waveguide and at least one output waveguide, and leave the odd-numbered line air columns that are no less than 7 row between input waveguide and the output waveguide; (3) make up resonator cavity in the air column that between input waveguide that step (2) is constituted and output waveguide, leaves with odd symmetry and two kinds of modes of resonance of even symmetry; The structure of this resonator cavity is not only about the plane symmetry perpendicular to input waveguide and output waveguide place, and about being parallel to the plane symmetry at input waveguide and output waveguide place.
The described structure resonator cavity of step (3) comprises following step: step 301: an air column at first choosing that delegation placed in the middle between input waveguide and output waveguide in the air column that leaves is as center air column O, do not change its crystallographic site, radius is made as r
OStep 302: 6 air columns that will be the most adjacent with center air column O are labeled as adjacent vacant gas column A, with the reduced radius of these 6 adjacent vacant gas column A to r
A, more respectively with their along the extrapolation of separately lattice direction, make the distance of center circle of the center of circle of adjacent vacant gas column A and center air column O from being r
dStep 303: will be labeled as time adjacent vacant gas column B with 6 air columns of O neighbour of center air column, and keep the former crystallographic site of these 6 adjacent vacant gas column B constant, the reduced radius with them arrives r simultaneously
BStep 304: on the direction parallel with input waveguide, to go together with center air column O and two air columns adjacent with 2 adjacent vacant gas column A are labeled as the air column C that goes together, keep the former crystallographic site of these 2 colleague's air column C constant, the radius with them increases to r simultaneously
CR wherein
O, r
A, r
d, r
BAnd r
CBe the cavity resonator structure parameter.
In above-mentioned method for designing, according to the operation wavelength of resonator cavity, in step (1), suitable grating constant a is set, perhaps in step (3), adjust cavity resonator structure parameter r
O, r
A, r
d, r
BAnd r
C
In above-mentioned method for designing, in step (2), form an input waveguide and an output waveguide, input waveguide and output waveguide are the linear pattern waveguide.
In above-mentioned method for designing, in step (2), form straight line type input waveguide and at least two broken line type output waveguides; Wherein the broken line type output waveguide is distributed in the both sides of linear pattern input waveguide, and that port that is positioned at the straight line portion that is parallel to input waveguide seals with air column.
A kind of photon crystal wavelength division multiplex device of the present invention adopts above-mentioned method for designing to obtain, its structure is: in the two-dimensional flat plate that constitutes by waveguide materials, be provided with arrange by dot matrix triangular in shape, radius is that the grating constant that the cylindrical air column of r constitutes is the 2 D photon crystal of a; Be provided with a line style input waveguide and at least one line style output waveguide in the 2 D photon crystal; Leave the odd-numbered line air column that is no less than 7 row between input waveguide and the output waveguide, this odd-numbered line air column is provided with the resonator cavity with odd symmetry and two kinds of modes of resonance of even symmetry, the structure of resonator cavity is not only about the plane symmetry perpendicular to input waveguide and output waveguide, and about being parallel to the plane symmetry of input waveguide and output waveguide.
Described resonator cavity comprises 6 the adjacent vacant gas column B of center air column O, center air column O 6 adjacent vacant gas column A, center air column O, and go together with center air column O and with 22 adjacent air column C that go together of adjacent vacant gas column A; The radius of center air column O is r
O, the radius of adjacent vacant gas column A is r
A, the center of circle of adjacent vacant gas column A and the distance of center circle of center air column O are from being r
d, the radius of inferior adjacent vacant gas column B is r
B, the radius of colleague's air column C is r
C, r wherein
AWith r
BAll be less than or equal to r
O, r
CMore than or equal to r
O, r
dMore than or equal to a.Preferably, r
O=0.30a-0.40a, r
A=0.15a-0.25a, r
d=1.10a-1.30a, r
B=0.20a-0.35a, r
C=0.40a-0.50a.
Action principle of the present invention is: because being with of photonic crystal is the function of normalized frequency a/ λ, the outgoing spectral line characteristic of device port is only relevant with a/ λ.The operation wavelength of resonator cavity can be set by each parameter of grating constant or cavity resonator structure, therefore by use different lattice constants a but the system of cavity resonator structure similar (ratio that is the structural parameters of resonator cavity and grating constant is constant) can obtain the different operating wavelength X
0Wavelength division multiplex device; By adjusting each parameter r of above cavity resonator structure
O, r
A, r
d, r
BAnd r
C, can change operation wavelength λ equally
0Adjust the device architecture of different operating wavelength as required, again these combination of devices are got up, just can form a multichannel wavelength division multiplex device.
From technique scheme and action principle as can be known, compared with prior art, the present invention has following advantage and beneficial effect:
1, the present invention has constructed a kind of very little cavity resonator structure with odd even symmetric mode, and promptly the volume of cavity resonator structure is little; And then can design a kind of very compact photon crystal wavelength division multiplex device, integrated level height.
2, wavelength division multiplex device of the present invention has nearly 100% download efficiency in theory equally, and resonator cavity has and is not less than 3000 Q value, the bandwidth of download signal is less than 0.5nm, thereby wavelength division multiplex device can be applied in the dense wavelength division multiplexing system that the wavelength interval standard is 0.8nm.And because the energy major part of odd even resonant mode concentrates in the medium of high refraction, wavelength division multiplex device of the present invention is when practical application, and the leakage on the vertical direction of three-dimensional structure will be very little.
3, the present invention constructs lattice structure by the mode of introducing air column on waveguide materials, can be easier to obtain by the mode of waveguide material being carried out photoetching on engineering.Therefore this wavelength division multiplex device is more convenient for being widely used in the integrated optics light path.
Description of drawings
Fig. 1 is the structural representation of photon crystal wavelength division multiplex device;
Fig. 2 is a kind of 2 D photon crystal wavelength division multiplex device sectional view and the normalized power spectrum thereof in the existing document;
Fig. 3 is a photon crystal wavelength division multiplex device sectional view of the present invention;
Fig. 4 is cavity resonator structure figure of the present invention;
Fig. 5 is the PHASE DISTRIBUTION figure of strange mould and even mould in the cavity resonator structure of the present invention;
Fig. 6 is the light wave demultiplexing device sectional view of embodiment 1;
Fig. 7 is the normalized power spectral line of each exit ports in Fig. 6 device architecture;
Fig. 8 is the light wave demultiplexing device sectional view of embodiment 2;
Fig. 9 is the normalized power spectral line of each exit ports in Fig. 8 device architecture,
Figure 10 is the multichannel ripple demultiplexing device synoptic diagram of embodiment 3;
Wherein: 1-12 represents the port of waveguide; R1-R12 represents resonator cavity; λ
1-λ
12Emergent light for each resonator cavity relevant work wavelength; Black round dot among Fig. 2 (a), Fig. 3, Fig. 6 and Fig. 8 and the white circle among Fig. 4 all represent to form medium post/air column that the periodicity of photon crystal structure is arranged.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Figure 3 shows that basic structure according to the designed photon crystal wavelength division multiplex device of the inventive method; Referring to Fig. 4, the design process of photonic crystal is specially:
The 1st step, in the two-dimensional flat plate that constitutes by waveguide materials, introduce the cylindrical air column that dot matrix triangular in shape is arranged, constitute 2 D photon crystal.Wherein, grating constant is that the cycle of arranging of air column is a, and the air column radius is r.During actual fabrication wavelength division multiplex device of the present invention, can adopt photolithographicallpatterned in the two-dimensional flat plate that constitutes by waveguide materials, to carve air column.
The 2nd step, remove in the two-dimensional flat plate air column on two lines, constitute two line defects, respectively as the first waveguide 1-2 and the second waveguide 3-4, wherein port one, 2 and port 3,4 be respectively the port of first, second waveguide; Leave the odd-numbered line air column that is no less than 7 row between first, second waveguide.The first waveguide 1-2 is the linear pattern waveguide, as input waveguide; The second waveguide 3-4 is linear pattern waveguide (as shown in Figure 3) or is broken line type waveguide (shown in Fig. 6,8), as output waveguide.Wherein the linear pattern waveguide is useful in and has in one road ripple multiplexing device of downloading or uploading; Seal with air column and the broken line type waveguide is positioned at that port of the straight line portion that is parallel to input waveguide in wavelength division multiplex device, and that port that is positioned at bending part is as output port, be applicable to have multi-path download/the ripple multiplexing device uploaded in.
In the 3rd step, go on foot the resonator cavity that structure has odd symmetry and two kinds of modes of resonance of even symmetry in the air column that leaves between first, second waveguide that is constituted the 2nd.The structure of resonator cavity is not only about plane (z=0) symmetry perpendicular to first waveguide and second waveguide, and about being parallel to plane (x=0) symmetry of first waveguide and second waveguide.Cavity resonator structure as shown in Figure 4, building process is specially:
Step 301: an air column at first choosing that delegation placed in the middle is as the center air column, and is labeled as O, do not change its crystallographic site, and radius is made as r
O
Step 302: 6 air columns that will be the most adjacent with center air column O are labeled as adjacent vacant gas column A.With the reduced radius of these 6 adjacent vacant gas column A to r
AAgain respectively with their along the extrapolation of separately lattice direction, make the distance of center circle of the center of circle of adjacent vacant gas column A and center air column O from being r
d
Step 303: will be labeled as time adjacent vacant gas column B with 6 air columns of O neighbour of center air column, and keep the former crystallographic site of these 6 adjacent vacant gas column B constant, the reduced radius with them arrives r simultaneously
B
Step 304: on the direction parallel, will go together with center air column O and two air columns adjacent with 2 adjacent vacant gas column A are labeled as the air column C that goes together with the first waveguide 1-2.Keep the former crystallographic site of these 2 colleague's air column C constant, the radius with them increases to r simultaneously
C
In method for designing of the present invention, the operation wavelength of resonator cavity can be set by following dual mode: first kind of mode is provided with suitable grating constant a in above-mentioned the 1st step; The second way is by adjusting each parameter r of cavity resonator structure
O, r
A, r
d, r
BAnd r
C
The structure of whole resonator cavity is not only about plane (z=0) symmetry of vertical two waveguides, and about the plane parallel with two waveguides (x=0) symmetry.And this resonator cavity can be realized odd symmetry and two kinds of modes of resonance of even symmetry, and the PHASE DISTRIBUTION of these two kinds of patterns has different symmetry for these two planes.For strange mould (Fig. 5 left side), PHASE DISTRIBUTION is about z=0 plane antisymmetry; For even mould (Fig. 5 right side), PHASE DISTRIBUTION is about the z=0 plane symmetry; Simultaneously, the PHASE DISTRIBUTION of two patterns is the antisymmetry structure for the x=0 plane.Therefore, according to coupled mode theory, when these two complete degeneracys of pattern, two patterns will be in resonance wavelength
0Stack takes place to disappear mutually in the place.When incident light wave when port one enters the first waveguide 1-2, centre wavelength is λ
0Light signal will be separated to fully among the second waveguide 3-4 by resonator cavity, and from port 4 directions output, coupling efficiency reaches 100%.And the light signal of other wavelength will continue to propagate in the second waveguide 1-2, and from port 2 outputs.Thereby device has been realized the function of wavelength-division multiplex.
A kind of basic wavelength division multiplex device that just method for designing obtained according to the present invention shown in Figure 3 is applicable to and has only in the Wave guide system of downloading or upload channel.And in the practical application, often require Wave guide system to have a plurality of downloads or upload channel, so that satisfy light signal is carried out intensive multiplexing demand.Below in conjunction with example more specifically, what further specify according to the present invention that method for designing obtained is improved and the wavelength division multiplex device that comes by basic structure shown in Figure 3.
Shown in Figure 6 is the Wave decomposing multiplexer with two-way download/upload passage that method for designing obtains according to the present invention.In the light wave demultiplexing device shown in Figure 6, grating constant a=0.45 μ m, air column radius are r=0.35a.The structural parameters of the first resonator cavity R1 are r
O1=0.35a, r
A1=0.21a, r
D1=1.21a, r
B1=0.30a, r
C1=0.46a.The structural parameters of the second resonator cavity R2 are r
O2=0.35a, r
A2=0.21a, r
D2=1.21a, r
B2=0.30a, r
C2=0.46a.Two resonator cavity R1, R2 structure are identical: the air column arrangement architecture is identical, and grating constant also equates.This moment, the operation wavelength of two resonator cavity R1, R2 was respectively λ
1=1556.3nm and λ
2=1572.8nm.The first waveguide 1-2 is the linear pattern waveguide, as input waveguide, is the channel main line; The second waveguide 3-4 and the 3rd waveguide 5-6 are the broken line type waveguides, as output waveguide, are download channel, are distributed in the both sides of the first waveguide 1-2.
For the ease of integrated, integrated two or more light wave demultiplexing systems particularly in the same side of main line waveguide, the structure of download channel and the basic structure of Fig. 3 are different.Difference is specially: after designing each parameter of grating constant resonant cavity, for the port 3 and the port 5 that do not need signal output, promptly be positioned at the sealing of the port 3 of straight line portion and port 5 usefulness air columns, and will be positioned at the port 4 of bending part and port 6 as output port.The center of first air column that is used to seal and the center of corresponding resonator cavity are not less than 5a along the distance of main line waveguide (i.e. the first waveguide 1-2) direction.In addition, the second waveguide 3-4 and the 3rd waveguide 5-6 are the broken line type waveguides, broken line part on port 4 and port 6 exit directions is 60 degree angles with the main line waveguide, and the crystallographic site of original air column that the broken line part is removed and the center of corresponding resonator cavity are not less than 6a along the distance of main line wave guide direction.This broken line part can also adopt other to improve guided wave efficient about the structure in the invention design of photonic crystal curved waveguide.
As light signal entered the channel main line first waveguide 1-2 from port one after, centre wavelength was λ
1One section narrow band signal will be downloaded to the passage second waveguide 3-4, and from port 4 outgoing; Centre wavelength is λ
2One section narrow band signal will be downloaded to passage 5-6, and from port 6 outgoing; Remaining light signal will be from port 2 outgoing.Fig. 7 is the normalized power spectral line of each exit ports of device.The position of exit end can be coupled with optical fiber, also can be connected in other integrated optical circuits via photon crystal wave-guide, further transmits signal.Thus, this structure has realized the function of the ripple demultiplexing device of light signal.Otherwise central cardiac wave is long to be λ
1And λ
2Light signal when entering device by port 4 and port 6 respectively, two light signals will turn to centre wavelength and be respectively λ
1And λ
2Narrow band signal upload among the channel main line first waveguide 1-2, from the port one outgoing.At this moment, this structure has just realized the function of the wavelength division multiplexer of light signal.
Shown in Figure 8 is the Wave decomposing multiplexer with two-way download channels equally, and different with Fig. 6 is that the grating constant of the air column array of dotted line both sides is inequality.Left side grating constant a
1=0.445 μ m, right side grating constant a
2=0.45 μ m, and arranged on left and right sides air column radius is respectively r
1=0.35a
1, r
2=0.35a
2The structural parameters of two resonator cavitys are specific as follows: the structural parameters of the 3rd resonator cavity R3 are r
O3=0.35a
1, r
A3=0.21a
1, r
D3=1.21a
1, r
B3=0.30a
1, r
C3=0.46a
1The structural parameters of the 4th resonator cavity R4 are r
O4=0.35a
2, r
A4=0.20a
2, r
D4=1.20a
2, r
B4=0.25a
2, r
C4=0.46a
2As seen each structural parameters and a of the 3rd resonator cavity R3
1Ratio and each structural parameters and a of the 4th resonator cavity R4
2Ratio equate respectively; Promptly two cavity resonator structures are similar: the air column arrangement architecture is identical, different just grating constant is different.This moment, the operation wavelength of two resonator cavitys was respectively 1539.2 λ
3=nm and λ
4=1556.3nm.Identical among the structure of download channels and the embodiment 1, light signal enters device from port 7, and the normalized power spectral line of each exit ports of device as shown in Figure 9.This device has realized that to centre wavelength be λ
3And λ
4The wavelength-division demultiplexing function of light signal; Equally, this device can be respectively λ as centre wavelength with port one 0 and port one 2
3And λ
4The incident port, be exit ports with port 7, realize the function of wavelength division multiplexer.
Figure 10 is the synoptic diagram of 8 road Wave decomposing multiplexers, and solid line is represented photon crystal wave-guide, and circle is represented the cavity resonator structure among the present invention.Each resonator cavity (R5, R6, R7 ..., R12) can use the way adjustment resonance wavelength of embodiment 1 or embodiment 2 (to be respectively λ
5, λ
6, λ
7..., λ
12), make that the signal of respective wavelength is split into each download channel on the main line to export.Therefore, with reference to arranging of resonator cavity among Figure 10 and waveguide, can produce Wave decomposing multiplexer with any multi-path download channel quantity; The described device of Figure 10 also can carry out inverse process to light signal to be handled, and realizes that any multichannel uploads the wavelength division multiplexer function of channel.
Claims (10)
1. the method for designing of a photon crystal wavelength division multiplex device is characterized in that may further comprise the steps:
(1) introduce the cylindrical air column that dot matrix triangular in shape is arranged in the two-dimensional flat plate that is made of waveguide materials, constituting grating constant is the 2 D photon crystal of a, and the air column radius is r;
(2) remove in the two-dimensional flat plate air column at least two lines, constitute at least two line defects, form an input waveguide and at least one output waveguide, and leave the odd-numbered line air columns that are no less than 7 row between input waveguide and the output waveguide;
(3) make up resonator cavity in the air column that between input waveguide that step (2) is constituted and output waveguide, leaves with odd symmetry and two kinds of modes of resonance of even symmetry; The structure of this resonator cavity is not only about the plane symmetry perpendicular to input waveguide and output waveguide place, and about being parallel to the plane symmetry at input waveguide and output waveguide place.
2. the method for designing of a kind of photon crystal wavelength division multiplex device according to claim 1 is characterized in that the described structure resonator cavity of step (3) comprises following step:
Step 301: an air column at first choosing that delegation placed in the middle between input waveguide and output waveguide in the air column that leaves does not change its crystallographic site as center air column O, and radius is made as r
O
Step 302: 6 air columns that will be the most adjacent with center air column O are labeled as adjacent vacant gas column A, with the reduced radius of these 6 adjacent vacant gas column A to r
A, more respectively with their along the extrapolation of separately lattice direction, make the distance of center circle of the center of circle of adjacent vacant gas column A and center air column O from being r
d
Step 303: will be labeled as time adjacent vacant gas column B with 6 air columns of O neighbour of center air column, and keep the former crystallographic site of these 6 adjacent vacant gas column B constant, the reduced radius with them arrives r simultaneously
B
Step 304: on the direction parallel with input waveguide, to go together with center air column O and two air columns adjacent with 2 adjacent vacant gas column A are labeled as the air column C that goes together, keep the former crystallographic site of these 2 colleague's air column C constant, the radius with them increases to r simultaneously
C
R wherein
O, r
A, r
d, r
BAnd r
CBe the cavity resonator structure parameter.
3. the method for designing of a kind of photon crystal wavelength division multiplex device according to claim 2 is characterized in that: according to the operation wavelength of resonator cavity, in step (1) suitable grating constant a is set, perhaps adjusts cavity resonator structure parameter r in step (3)
O, r
A, r
d, r
BAnd r
C
4. the method for designing of a kind of photon crystal wavelength division multiplex device according to claim 2 is characterized in that: form an input waveguide and an output waveguide in step (2), input waveguide and output waveguide are the linear pattern waveguide.
5. the method for designing of a kind of photon crystal wavelength division multiplex device according to claim 2 is characterized in that: form straight line type input waveguide and two broken line type output waveguides in step (2) at least; Wherein the broken line type output waveguide is distributed in the both sides of linear pattern input waveguide, and that port that is positioned at the straight line portion that is parallel to input waveguide seals with air column.
6. the method for designing of a kind of photon crystal wavelength division multiplex device according to claim 1 is characterized in that: the air column in the step (1) adopts photolithographicallpatterned to carve in the two-dimensional flat plate that is made of waveguide materials.
7. photon crystal wavelength division multiplex device is characterized in that: in the two-dimensional flat plate that constitutes by waveguide materials, be provided with arrange by dot matrix triangular in shape, radius is that the grating constant that the cylindrical air column of r constitutes is the 2 D photon crystal of a; Be provided with a line style input waveguide and at least one line style output waveguide in the 2 D photon crystal; Leave the odd-numbered line air column that is no less than 7 row between input waveguide and the output waveguide, this odd-numbered line air column is provided with the resonator cavity with odd symmetry and two kinds of modes of resonance of even symmetry, the structure of resonator cavity is not only about the plane symmetry perpendicular to input waveguide and output waveguide, and about being parallel to the plane symmetry of input waveguide and output waveguide.
8. a kind of photon crystal wavelength division multiplex device according to claim 7, it is characterized in that: described resonator cavity comprises 6 the adjacent vacant gas column B of center air column O, center air column O 6 adjacent vacant gas column A, center air column O, and go together with center air column O and with 22 adjacent air column C that go together of adjacent vacant gas column A; The radius of center air column O is r
O, the radius of adjacent vacant gas column A is r
A, the center of circle of adjacent vacant gas column A and the distance of center circle of center air column O are from being r
d, the radius of inferior adjacent vacant gas column B is r
B, the radius of colleague's air column C is r
C, r wherein
AWith r
BAll be less than or equal to r, r
CMore than or equal to r, r
dMore than or equal to a.(r
ONeed not be equal to r)
9. a kind of photon crystal wavelength division multiplex device according to claim 8 is characterized in that: r
O=0.30a-0.40a, r
A=0.15a-0.25a, r
d=1.10a-1.30a, r
B=0.20a-0.35a, r
C=0.40a-0.50a.
10. a kind of photon crystal wavelength division multiplex device according to claim 8 is characterized in that: be provided with straight line type input waveguide and at least two broken line type output waveguides in the described 2 D photon crystal; Wherein the broken line type output waveguide is distributed in the both sides of linear pattern input waveguide, and that port that is positioned at straight line portion is provided with the air column that is used to seal.
Priority Applications (1)
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|---|---|---|---|
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| CN101825745A (en) * | 2010-04-02 | 2010-09-08 | 北京邮电大学 | Tunable-wavelength two-dimensional photonic crystal demultiplexer based on microfluid injection technology |
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