CN207623564U - The single fiber three-way optical device of cavity waveguide is coupled based on hetero-junction photon crystal - Google Patents
The single fiber three-way optical device of cavity waveguide is coupled based on hetero-junction photon crystal Download PDFInfo
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Abstract
The utility model discloses a kind of single fiber three-way optical devices coupling cavity waveguide based on hetero-junction photon crystal, the first photonic crystal elements including interconnection and the second photonic crystal elements, first photonic crystal elements are equipped with a main waveguide and the waveguide of the roads Liang Tiaoxia, the waveguide of the roads Liang Tiaoxia is located at the both sides of main waveguide, it the axle center line overlap of the roads Liang Tiaoxia waveguide and is mutually perpendicular to the axial line of main waveguide, second photonic crystal elements are equipped with the roads a Tiao Shang waveguide, the axial line of upper road waveguide and the axle center line overlap of main waveguide, between main waveguide and the waveguide of the roads Liang Tiaoxia, it is respectively equipped with a coupled micro-cavity between main waveguide and the upper road waveguide, passive silicon defective media column is respectively equipped in three coupled micro-cavities.The utility model uses heterojunction type photon crystal material, realizes multichannel filtering；By adjusting the radius and offset of passive silicon defective media column in two microcavitys, transmissivity is improved, reduces insertion loss, increases target light wave transmitance.
Description
Technical field
The utility model is related to a kind of single fiber three-way optical devices, more particularly to one kind being based on hetero-junction photon crystal coupler
The single fiber three-way optical device of waveguide.
Background technology
Demand with data service to bandwidth is growing, and traditional optical device cannot be satisfied the logical of high speed development
Communication network.In modern optical communication systems, single fiber three-way optical device is a core devices of PON modes FTTH, its performance
Directly influence communication quality, major function be 1490nm by simulation CATV signals that wavelength is 1550nm, wavelength number
Word signal and the terminal user that wavelength is 1310nm are transmitted signal and are coupled into an optical fiber, to realize " triple play ” industry
Business.
Single fiber three-way optical device in current practice is coupled to form by discrete element, have be not easy to encapsulate,
The shortcomings of loss is serious and of high cost, and size is generally millimeter and centimetre scale, far from being satisfied with the following Integrated Light
Learn device development.As a kind of emerging dielectric material, photonic crystal has the characteristics that highly integrated, easy to control, can flexibly control light
Transmission, be widely used in integrated optical circuit field, especially the development of optic communication device, as single-fiber bidirectional optical device,
Single fiber three-way optical device (Triplexer) and optical demultiplexer etc..
Photonic crystal is a kind of lattice structure of the periodic arrangement of same index distribution, and most basic feature is exactly
" forbidden photon band " (PBG), i.e., the electromagnetic wave that frequency is fallen within the scope of forbidden band cannot pass through photonic crystal.Using this characteristic,
The resonant microcavity and waveguide generation resonance coupling that point defect and line defect are formed are introduced in complete photonic crystal, so that it may realization pair
The control of light path wavelength magnitude.
In the practical application of single fiber three-way optical assembly, except require its with highly integrated structure in addition to, should also have place
Manage the ability of multiple communication bands.However it is very few currently based on the report of path filter under the multichannel of photonic crystal, it can grasp
The wavelength of work is generally more single, and structure is complex, and there are still certain losses to communication band, reduces indirectly required
The transmitance of light wave, specific defect are as follows：
1. traditional single fiber three-way optical device is coupled to form by discrete element, integrated level is relatively low, process
It is also easy to produce error, to reduce coupling efficiency, causes loss serious, device encapsulation difficulty is larger, low production efficiency, there is filtering
The problems such as piece is easy to scratch, rejection rate and cost are higher, are not suitable for the development of the following integreted phontonics；
2. due to different medium dielectric constant than, lattice structure, media filler than etc. Material Designs it is unreasonable,
Cause forbidden photon band relatively narrow, corresponding wavelength X range section meets communication band range so that filtering frequency range is more single,
The requirement of multiplex system cannot be met；
3. the overall construction design of microcavity and the loss for be easy to causeing part light-wave energy with the coupling of waveguide, there are bases
It is complicated in the filter design scheme of photonic crystal micro-ring structure, and this structure is easy in ring region corner
Other patterns have been excited, to reduce road efficiency under filter, loss has been increased, reduces transmitance.
Utility model content
The purpose of this utility model be that solve the above-mentioned problems and provide it is a kind of it is simple in structure, transmitance is high, slotting
Enter to be lost small, the high single fiber three-way optical device that cavity waveguide is coupled based on hetero-junction photon crystal of isolation.
The utility model is achieved through the following technical solutions above-mentioned purpose：
A kind of single fiber three-way optical device coupling cavity waveguide based on hetero-junction photon crystal, includes the first light of interconnection
Sub- crystal unit and the second photonic crystal elements, the photonic crystal lattice constants of first photonic crystal elements are a1nm, the
One passive silicon medium column radius is r1nm, and the photonic crystal lattice constant of second photonic crystal elements is a2nm, the second nothing
Source silicon medium column radius is r2nm, first photonic crystal elements be equipped with the main waveguide that a longer line defect is formed and
The lower road waveguide that two shorter line defects are formed, two lower road waveguides are located at the both sides of the main waveguide, two
It the axle center line overlap of the lower road waveguide and is mutually perpendicular to the axial line of the main waveguide, second photonic crystal elements are set
There are the upper road waveguide that a shorter line defect is formed, the axial line weight of the axial line and the main waveguide of the upper road waveguide
It is folded, it is respectively equipped with one between the main waveguide and two lower road waveguides, between the main waveguide and the upper road waveguide
Coupled micro-cavity is respectively equipped with passive silicon defective media column, the main waveguide and the upper road waveguide in three coupled micro-cavities
Between the coupled micro-cavity be located in second photonic crystal elements.
Preferably, the passive silicon defective media column in each coupled micro-cavity is two, the main waveguide
The connecting line of two passive silicon defective media columns in two coupled micro-cavities between two lower road waveguides
With the axis parallel of the lower road waveguide, two in the coupled micro-cavity between the main waveguide and the upper road waveguide
The axis parallel of the connecting line of the passive silicon defective media column and the upper road waveguide.
Preferably, be spaced between two passive silicon defective media columns in each coupled micro-cavity three it is right
The passive silicon dielectric posts answered.
Preferably, a1 is 460, r1 110, a2 420, r2 100.
Preferably, described in two in the coupled micro-cavity between the main waveguide and first lower road waveguide
A diameter of 101.2nm of passive silicon defective media column, described between the main waveguide and lower road waveguide described in Article 2 couple
A diameter of 85.6nm of two passive silicon defective media columns in microcavity, between the main waveguide and the upper road waveguide
A diameter of 70.6nm of two passive silicon defective media columns in the coupled micro-cavity；The main waveguide with first described in
The passive silicon defective media column of two in the coupled micro-cavity between the waveguide of lower road is respectively to Centre position deviation
112nm, two passive defect silicons in the coupled micro-cavity between lower road waveguide described in the main waveguide and Article 2
Dielectric posts are respectively to Centre position deviation 110nm, in the coupled micro-cavity between the main waveguide and the upper road waveguide
Two passive silicon defective media columns are respectively to Centre position deviation 100nm.
The beneficial effects of the utility model are：
The utility model utilizes artificial micro-structure material --- photonic crystal, and using by the first photonic crystal elements and the
The heterojunction type structure that two photonic crystal elements are formed has extremely strong light control capacity, is easy to the integrated of device, is single fiber three
Integrated, micromation to optical device provide possibility；Using heterojunction type photon crystal material, dielectric material ginseng is rationally designed
Number, adjustment forbidden photon band meet Triplexer wavelength bands, realize multichannel filtering；Double microcavity coupled waveguide knots can be utilized
Structure (double microcavitys here refer to double micro-cavity structures of the formation of two passive silicon defective media columns in a coupled micro-cavity) is selected
The light of 1310nm, and to the light reflection of its all band, designed using heterojunction type, i.e., the lattice constant of two photonic crystal elements
Difference makes 1310nm light be in the forbidden photon band in II structures, it is ensured that 1310nm light is bound in waveguide until steadily
Reach output end；By adjusting the radius and offset of passive silicon defective media column in two microcavitys so that between microcavity center of energy
Away from the spacing less than passive silicon defective media column transmissivity is improved to increase the transition coefficient between adjacent chamber；It is symmetrical by designing
The double microcavity Coupled Passive Waveguide Structures of formula, adjust defect sturcture parameter and waveguide reflective distance, reduce insertion loss, increase target light wave
Transmitance is to 99% or more.
Description of the drawings
Fig. 1 is the vertical view of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
Structural schematic diagram；
Fig. 2 is the TE energy of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
Band structure schematic diagram；
Fig. 3 is the double micro- of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
Lumen type coupler waveguiding structure schematic diagram；
Fig. 4 is the coupling of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
The waveguide transmission spectrum schematic diagram of microcavity；
Fig. 5 is the simplification of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
Illustraton of model；
Fig. 6 is the peak value of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
Reflectivity schematic diagram；
Fig. 7 is the transmission of the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
Compose schematic diagram；
Fig. 8 is the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
1310nm steady-state field distribution maps；
Fig. 9 is the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
1490nm steady-state field distribution maps；
Figure 10 is the single fiber three-way optical device described in the utility model that cavity waveguide is coupled based on hetero-junction photon crystal
1550nm steady-state field distribution maps.
Specific implementation mode
The utility model is described in further detail below in conjunction with the accompanying drawings：
As shown in Figure 1, the single fiber three-way optical device described in the utility model for coupling cavity waveguide based on hetero-junction photon crystal
The photon of the first photonic crystal elements 1 including interconnection and the second photonic crystal elements 9, the first photonic crystal elements 1 is brilliant
Body lattice constant is a1nm, the radius of the first passive silicon dielectric posts 2 is r1nm, and the photonic crystal of the second photonic crystal elements 9 is brilliant
Lattice constant is a2nm, the radius of the second passive silicon dielectric posts 10 is r2nm, and the first photonic crystal elements 1 are longer equipped with one
Lower road waveguide i.e. first time road waveguide 4 and the second time road that the main waveguide 3 and two shorter line defects that line defect is formed are formed
Waveguide 11, first time road waveguide 4 and second time road waveguide 11 are located at the both sides of main waveguide 3 and symmetrical, first time road
It the axle center line overlap of waveguide 4 and second time road waveguide 11 and is mutually perpendicular to the axial line of main waveguide 3, the second photonic crystal elements
9 are equipped with the upper road waveguide 7 that a shorter line defect is formed, the axial line of upper road waveguide 7 and the axle center line overlap of main waveguide 3,
Between main waveguide 3 and first time road waveguide 4, between main waveguide 3 and second time road waveguide 11, between main waveguide 3 and upper road waveguide 7
Be respectively equipped with a coupled micro-cavity 6, passive silicon defective media column be respectively equipped in three coupled micro-cavities 6, wherein main waveguide 3 with
The first passive silicon defective media column 5 of a diameter of 101.2nm there are two being set in coupled micro-cavity 6 between first time road waveguide 4, two
The connecting line of the connecting line of a first passive silicon defective media column 5 and two the second passive silicon defective media columns 12 under first
The axis parallel of road waveguide 4 and second time road waveguide 11, in the coupled micro-cavity 6 between main waveguide 3 and second time road waveguide 11
If there are two the second passive silicon defective media column 12 of a diameter of 85.6nm, the coupled micro-cavity between main waveguide 3 and upper road waveguide 7
The third passive silicon defective media column 8 there are two a diameter of 70.6nm, the company of two third passive silicon defective media columns 8 are set in 6
The axis parallel of wiring and upper road waveguide 7, between two the first passive silicon defective media columns 5, two the second passive defect silicons
It is spaced three the first passive silicon dielectric posts 2 between dielectric posts 12, three are spaced between two third passive silicon defective media columns 8
Second passive silicon dielectric posts 10, the coupled micro-cavity 6 between main waveguide 3 and upper road waveguide 7 are located in the second photonic crystal elements 9.
It is preferably 110, a2 be preferably 420, r2 is preferably 100 that above-mentioned a1, which is preferably 460, r1,；Correspondingly, main waveguide 3 with
A diameter of 101.2nm of two the first passive silicon defective media columns 5 in coupled micro-cavity 6 between first time road waveguide 4, main wave
Lead a diameter of of two the second passive silicon defective media columns 12 in the coupled micro-cavity 6 between 3 and second time road waveguide 11
85.6nm, two third passive silicon defective media columns 8 in the coupled micro-cavity 6 between main waveguide 3 and upper road waveguide 7 it is a diameter of
70.6nm；Two the first passive silicon defective media columns 5 difference in coupled micro-cavity 6 between main waveguide 3 and first time road waveguide 4
To the Centre position deviation 112nm of the coupled micro-cavity 6, two in coupled micro-cavity 6 between main waveguide 3 and second time road waveguide 11
A second passive silicon defective media column 12 is respectively to the Centre position deviation 110nm of the coupled micro-cavity 6, main waveguide 3 and upper road wave
The two third passive silicon defective media columns 8 led in the coupled micro-cavity 6 between 7 are inclined to the center of the coupled micro-cavity 6 respectively
Move 100nm.
Explanation：Above three coupled micro-cavity 6 is the region for 3 × 5 matrixes formation that corresponding passive silicon dielectric posts are constituted,
Corresponding two passive silicons defective media column is located at the passive silicon dielectric posts corresponding position in the middle part of both ends to coupled micro-cavity 6
Position after the above-mentioned distance of Centre position deviation；Above-mentioned main waveguide 3, first time road waveguide 4, second time road waveguide 11, upper road wave
It is the line defect for removing the corresponding passive silicon dielectric posts of a row or column and being formed to lead 7, and main waveguide 3 is that the line of both ends perforation lacks
It falls into, first time road waveguide 4, second time road waveguide 11 and upper road waveguide 7 are that one end penetrates through, the other end still has passive silicon medium
The line defect of column.
In order to prove the single fiber three-way optical device described in the utility model for coupling cavity waveguide based on hetero-junction photon crystal
Creativeness is specifically described with reference to mentality of designing, practical application and partial properties index：
(1) band structure：
Using air (effective refractive index 1) as background, using passive silicon materials as dielectric posts, lattice structure is regular crystal
Lattice, radius R are 0.2a, and wherein a indicates that photonic crystal lattice constant and value are 420nm, and microcavity is effectively reflected with silicon dielectric posts
Rate is 3.48.The dispersion curve figure containing photonic crystal band gap is calculated using plane wave expansion method as shown in Fig. 2,
Calculation shows that the photon crystal structure only has TE band gap and without TM band gap, forbidden photon band normalized frequency as shown in the figure [0.251,
0.366], corresponding vacuum medium wavelength range [1147,1673.3] nm, meets Triplexer (i.e. single fiber three-way optical device, similarly hereinafter)
Wavelength band.
(2) novel coupler waveguiding structure：
Two microcavity medium column radius r are set to 0.09a, it is ensured that two microcavitys resonant frequency having the same.To inhibit waveguide
In multimode light wave transmissions, set two adjacent microcavity centre distances to d=4a.Double Micro-chambers shown in Fig. 3 couple cavity waveguide
Structure, definition are denoted as "+" along positive direction of the x-axis offset, are denoted as "-" along negative direction of the x-axis offset, offset Δ x=0.5a is simultaneously used
The mode of symmetrical deflection, it is as shown in Figure 4 using the transmissison characteristic of the FDTD analysis structure, it can be seen that when two micro-
The offset of chamber is controlled in [80,120] nm, nearly 100% efficiency of transmission can be obtained, and full width at half maximum value is about 10nm, narrow
Band characteristic is good.
(3) novel Triplexer structure designs：
Fig. 1 show General layout Plan, and device size is 14 μm of 10 μm of x, and design parameter is as shown in Table 1.Fig. 5 is
Design scheme simplified model, the model is by two photonic crystal I 1 Hes of i.e. the first photonic crystal elements with different lattice constants
I.e. the second photonic crystal elements 9 of photonic crystal II form.The light of 1490nm and 1550nm wave bands is descended road to first time road respectively
In waveguide 4 and second time road waveguide 11, remaining part light x1 and x2 are reflected at heterojunction boundary, analysis chart 6, setting
1490nm waveguides and 1550nm waveguide reflective distances are 2.26um, make the phase that the light of main waveguide is leaked in reflected light and coupler
Position difference is π to coherent subtraction, it is ensured that target band of light reaches lower paths as much as possible.
One defect major parameter of table
Fig. 7-Figure 10 show the normalization transmission spectrum and steady-state field distributed effect of this single fiber three-way optical device,
Efficiency of transmission at 1310nm, 1490nm and 1550nm reaches nearly 100%, and line style is Lorentzian lineshape, in lower road waveguide
Data are measured using detector, show that Triplexer performance indicators are as shown in Table 2.From the data in the table, the design is inserting
Entering loss, isolation, transmitance etc. has superior performance.
Two Triplexer performance indicators of table
Above-described embodiment is the preferred embodiment of the utility model, is not the limit to technical solutions of the utility model
System, as long as without the technical solution that creative work can be realized on the basis of the above embodiments, is regarded as falling into
In the rights protection scope of the utility model patent.
Claims (5)
1. a kind of single fiber three-way optical device coupling cavity waveguide based on hetero-junction photon crystal, it is characterised in that：Including mutually interconnecting
The first photonic crystal elements and the second photonic crystal elements connect, the photonic crystal lattice constant of first photonic crystal elements
It is r1nm for a1nm, the first passive silicon medium column radius, the photonic crystal lattice constant of second photonic crystal elements is
A2nm, the second passive silicon medium column radius are r2nm, and first photonic crystal elements are equipped with a longer line defect shape
At the lower road waveguide that is formed of main waveguide and two shorter line defects, two lower road waveguides are located at the main waveguide
Both sides, the axle center line overlap of two lower road waveguides and be mutually perpendicular to the axial line of the main waveguide, second light
Sub- crystal unit is equipped with the upper road waveguide that a shorter line defect is formed, axial line and the main waveguide of the upper road waveguide
Axle center line overlap, between the main waveguide and two lower road waveguides, between the main waveguide and the upper road waveguide point
It does not set there are one coupled micro-cavity, passive silicon defective media column, the main waveguide and institute is respectively equipped in three coupled micro-cavities
The coupled micro-cavity between the waveguide of the roads Shu Shang is located in second photonic crystal elements.
2. the single fiber three-way optical device according to claim 1 for coupling cavity waveguide based on hetero-junction photon crystal, feature
It is：The passive silicon defective media column in each coupled micro-cavity is two, the main waveguide with two it is described under
The connecting line of two passive silicon defective media columns in two coupled micro-cavities between the waveguide of road and the lower road wave
The axis parallel led, two passive silicons in the coupled micro-cavity between the main waveguide and the upper road waveguide lack
Fall into the axis parallel of the connecting line and the upper road waveguide of dielectric posts.
3. the single fiber three-way optical device according to claim 2 for coupling cavity waveguide based on hetero-junction photon crystal, feature
It is：Three corresponding passive silicons are spaced between two passive silicon defective media columns in each coupled micro-cavity to be situated between
Matter column.
4. the single fiber three-way optical device according to claim 1,2 or 3 that cavity waveguide is coupled based on hetero-junction photon crystal,
It is characterized in that：A1 is 460, r1 110, a2 420, r2 100.
5. the single fiber three-way optical device according to claim 4 for coupling cavity waveguide based on hetero-junction photon crystal, feature
It is：The passive defect silicon of two in the coupled micro-cavity between the main waveguide and first lower road waveguide is situated between
A diameter of 101.2nm of matter column, two in the coupled micro-cavity between lower road waveguide described in the main waveguide and Article 2
A diameter of 85.6nm of the passive silicon defective media column, the coupled micro-cavity between the main waveguide and the upper road waveguide
A diameter of 70.6nm of two interior passive silicon defective media columns；Between the main waveguide and first lower road waveguide
The coupled micro-cavity in two passive silicon defective media columns respectively to Centre position deviation 112nm, the main waveguide
Two passive silicon defective media columns in the coupled micro-cavity between lower road waveguide described in Article 2 are respectively to center
Position offset 110nm, two passive silicons in the coupled micro-cavity between the main waveguide and the upper road waveguide lack
Sunken dielectric posts are respectively to Centre position deviation 100nm.
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| CN201721741499.7U CN207623564U (en) | 2017-12-12 | 2017-12-12 | The single fiber three-way optical device of cavity waveguide is coupled based on hetero-junction photon crystal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669239A (en) * | 2019-01-04 | 2019-04-23 | 深圳大学 | A kind of orthogonal division Mode interference FANO resonant structure of photonic crystal waveguide |
| CN112925058A (en) * | 2021-01-22 | 2021-06-08 | 中山大学 | Photonic crystal narrow-band filter based on zero-dimensional topological angular state |
-
2017
- 2017-12-12 CN CN201721741499.7U patent/CN207623564U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669239A (en) * | 2019-01-04 | 2019-04-23 | 深圳大学 | A kind of orthogonal division Mode interference FANO resonant structure of photonic crystal waveguide |
| CN109669239B (en) * | 2019-01-04 | 2020-10-02 | 深圳大学 | Orthogonal splitting mode interference FANO resonance structure of photonic crystal waveguide |
| CN112925058A (en) * | 2021-01-22 | 2021-06-08 | 中山大学 | Photonic crystal narrow-band filter based on zero-dimensional topological angular state |
| CN112925058B (en) * | 2021-01-22 | 2022-03-04 | 中山大学 | Photonic crystal narrow-band filter based on zero-dimensional topological angular state |
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