CN104914509A - Double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer - Google Patents
Double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer Download PDFInfo
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- CN104914509A CN104914509A CN201510373320.6A CN201510373320A CN104914509A CN 104914509 A CN104914509 A CN 104914509A CN 201510373320 A CN201510373320 A CN 201510373320A CN 104914509 A CN104914509 A CN 104914509A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/2931—Diffractive element operating in reflection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/29311—Diffractive element operating in transmission
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- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The invention discloses a double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer. The wavelength division multiplexer includes an input waveguide, a first output waveguide array and a second output waveguide array. An incident end port of the input waveguide and an exit end port of the first output waveguide array are disposed on a first Rowland circle. The incident end port of the input waveguide and the exit end port of the second output waveguide array are disposed on a second Rowland circle and the incident end port is the joint of the first Rowland circle and the second Rowland circle. A first diffraction grating is arranged at a tangent position of the first Rowland circle and a first diffraction grating. A second diffraction grating is arranged at a tangent position of the second Rowland circle and a second diffraction grating. The double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer can be used for diffraction beam split in multiple wavebands and can solve problems in integration of three networks in the optical communication field effectively. By applying the double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer, single-process quick detection of spectrums of a to-be-detected object in different spectrum segments can be realized. The double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer can be applied to fields of medical detection, food safety detection, mine safety detection, water environment monitoring and the like.
Description
[technical field]
The invention belongs to optical communication, light sensing, photodetection field relate to wavelength-division multiplex technique, be specifically related to a kind of Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband.
[background technology]
Wavelength division multiplexer is one of the important devices in optical communication field and light sensor measuring field, at optical communication field, wavelength division multiplexer realizes tens times, the channel dilatation of hundred times when without the need to increasing and laying light network, is that the microminiature spectroanalysis instrument of core can be applicable to food safety detection, mine safety detection, air Water Pollution Monitoring, medical science detection etc. in light sensor measuring field with wavelength division multiplexer.
Planar integration waveguide multiplexer is the mainstream development direction of wavelength division multiplexer, wherein array waveguide grating (Arrayed Waveguide Grating, being called for short AWG) type and etched diffraction grating type (Etched DiffractionGrating is called for short EDG) they are two kinds of main devices of Planar integration waveguide multiplexer.
EDG device is little with size, stable performance, be easy to batch production, cost is low, be applicable to doing dense wavelength division multiplexing and obtaining research and apply widely.Wherein EDG (Bragg-EDG) device of Bragg catoptron cutting structure is study hotspot in recent years, the type device is without the need to secondary processing, light engraving erosion can realize device function, and technology difficulty is relatively low and diffraction efficiency is higher, is the focus of Recent study.
The people such as Brouckaert J devise the Bragg reflecting surface concave diffraction grating Coarse Wave Division Multiplexer (Planar concave grating demultiplexer withdistributed Bragg reflection facets, Proceedings of the 4th IEEE InternationalConference on Group IV Photonics.2007:1-3.) that frequency band is 1.5um-1.6um on silicon based silicon dioxide material.The people such as Pierre Pottier devise Bragg ellipse rudimentary efficient diffraction concave grating (Mono-order high-efficiency dielectricconcave diffraction grating of periodic structure, Journal of Lightwave Technology, 2012,, and utilize this structure to carry out processing based on the microminiature Integrated Light wavelength division multiplexer of silicon-on-insulator and making 30 (17): 2922-2928).The scholar of above-mentioned Liang Ge group mainly carries out the design of Bragg-EDG based on the multilayered medium film theory of 1/4 wavelength.The primary study reflection efficiency problem of Bragg-EDG, ignores Bragg-EDG and also has transmission effect at other frequency bands.
Its transmission bands that the zone of reflections that only make use of Bragg-EDG grating in prior art is ignored, and the present invention also effectively make use of the transmission bands of Bragg-EDG grating except the zone of reflections that make use of Bragg-EDG grating, make the present invention that two Bragg-EDG gratings can be utilized on same substrate to carry out diffraction light splitting at two wave bands, reach when device size is constant, increase point optical channel and the object of dividing optical band.At optical communication field, the present invention can carry out at multiband the problem that diffraction light splitting effectively can solve the optical communication field integration of three networks; In spectrographic detection field, detected material generally needs the characteristic spectrum of multiple spectral coverage to analyze, and application the present invention can carry out single to the spectrum detecting thing different spectral coverage and detect fast, the present invention can be applicable to medical treatment and detects, food safety detection, mining safety monitoring, the fields such as monitoring water environment.
[summary of the invention]
The object of the invention is to the transmission effect that reasonably make use of Bragg-EDG device, propose a kind of Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband.
For achieving the above object, the present invention is achieved by the following technical solutions:
A Bragg-concave diffraction grating wavelength division multiplexer for double grating two waveband, comprises input waveguide (101), the first output waveguide array (102) and the second output waveguide array (202); The entry port (105) of input waveguide (101) and the exit ports (106) of the first output waveguide array (102) are positioned on the first Rowland circle, the entry port (105) of input waveguide (101) and the exit ports (206) of the second output waveguide array (202) are positioned on the second Rowland circle, and entry port (105) is the intersection point of the first Rowland circle and the second Rowland circle; The tangent place of the first Rowland circle and the first diffraction grating circle arranges the first diffraction grating (104), and the tangent place of the second Rowland circle and the second diffraction grating circle arranges the second diffraction grating (204).
The present invention further improves and is:
Being the first free transmission region (103) between entry port (105) to the first diffraction grating (104), is the second free transmission region (203) between entry port (105) to the second diffraction grating (204).
The concave grating that first diffraction grating (104) and the second diffraction grating (204) etch for Bragg cutting structure.
Concave grating adopts the concave grating be made up of the Bragg reflector array in the single cycle or multiple cycle.
First Rowland circle is inscribed within the first diffraction grating circle, second Rowland circle is inscribed within the second diffraction grating circle, and the first rowland diameter of a circle equals the first diffraction grating radius of a circle, second rowland diameter of a circle equals the second diffraction grating radius of a circle and it is characterized in that: the tangent place of the first Rowland circle and the first diffraction grating circle is the center of the first diffraction grating (104), and concave surface first diffraction grating (104) adopts periodically Bragg reflecting surface structure to be arranged on the first diffraction grating circle; The tangent place of the second Rowland circle and the second diffraction grating circle is the center of concave surface second diffraction grating (204) that Bragg cutting structure etches, and concave surface second diffraction grating (204) adopts periodically Bragg reflecting surface structure to be arranged on the second diffraction grating circle.
First diffraction grating (104) and the second diffraction grating (204) arrange stacking formation by the material periodicities that two kinds of refractive indexes are different.
The width of the material that two kinds of refractive indexes of the first diffraction grating (104) are different is respectively d
1and d
2, the periodic thickness d of the first diffraction grating Bragg reverberator
12determined by 1-D photon crystal theory, wherein, d
12=d
1+ d
2; The width of the material that two kinds of refractive indexes that the second diffraction grating (204) adopts are different is respectively d
3and d
4, its periodic thickness d
34determined by 1-D photon crystal theory, wherein, d
34=d
3+ d
4.
Compared with prior art, the present invention has following beneficial effect:
[accompanying drawing explanation]
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is the present invention 800 and the diffraction field pattern of 1310nm light in bigrating structures;
Fig. 3 is the diffraction spectrogram of bigrating structures of the present invention.
Wherein: 101 is input waveguide; 102 is the first output waveguide array; 103 is the first free transmission region; 104 is the first diffraction grating; 105 is entry port; 106 is exit ports; 202 is the second output waveguide array; 203 is the second free transmission region; 204 is the second diffraction grating; 206 is exit ports.
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1, to Fig. 3, the present invention includes input waveguide 101, first output waveguide array 102 and the second output waveguide array 202, the entry port 105 of input waveguide 101 and the exit ports 106 of the first output waveguide array 102 are positioned on the first Rowland circle, the entry port 105 of input waveguide 101 and the exit ports 206 of the second output waveguide array 202 are positioned on the second Rowland circle, and entry port 105 is intersection points of the first Rowland circle and the second Rowland circle.It is the first free transmission region 103 between entry port to the first diffraction grating, it is the second free transmission region 203 between entry port to the second diffraction grating, first Rowland circle is inscribed within the first diffraction grating circle, second Rowland circle is inscribed within the second diffraction grating circle, and the first rowland diameter of a circle equals the first diffraction grating radius of a circle, second rowland diameter of a circle equals the second diffraction grating radius of a circle and it is characterized in that: the tangent place of the first Rowland circle and the first diffraction grating circle is the center of concave surface first diffraction grating that Bragg cutting structure etches, concave surface first diffraction grating 104 adopts periodically Bragg reflecting surface structure to be arranged on the first diffraction grating circle.The tangent place of the second Rowland circle and the second diffraction grating circle is the center of concave surface second diffraction grating that Bragg cutting structure etches, and concave surface second diffraction grating 204 adopts periodicity Bragg reflecting surface structure along the upper arrangement of the second diffraction grating circle.
Concave surface first diffraction grating and concave surface second diffraction grating adopt the concave grating be made up of the Bragg reflector array in the single cycle or multiple cycle.The Bragg reflector structure of concave surface first diffraction grating has high retroaction in first band, and second band has high effect thoroughly.The Bragg mirror structure of concave surface second diffraction grating has high retroaction in second band.The concave grating of Bragg reflector array composition forms by periodic dielectric layer is stacking, and incident light carries out diffraction light splitting to the light of first band after Bragg-EDG first diffraction grating, produces diffracted beam.And the Transmission light of second band carries out diffraction light splitting on the second diffraction grating after crossing the first diffraction grating, produce diffracted beam.The light of the first diffraction grating 104 pairs of first band carries out diffraction light splitting, has high-transmission rate to the light of second band, and light transmission first diffraction grating 104 of second band carries out diffraction light splitting on the second diffraction grating 204.
The invention also discloses a kind of method for designing of etching diffraction grating wavelength division multiplexer of Bragg cutting structure, comprise the following steps:
1) according to the Refractive Index of Material of Bragg reflector periods structure and Bragg reverberator blazing angle and incident angle of light, transfer matrix method is utilized to obtain the dielectric thickness ratio of the first diffraction grating and the second diffraction grating and the relation of photonic band gap respectively.
2) according to the dielectric thickness ratio of the first diffraction grating Bragg reverberator and the relation between being with, suitable dielectric thickness ratio is chosen and according to grating according to formula
trying to achieve the single periodic thickness of Bragg reverberator makes the Bragg reverberator of the first diffraction grating have good reflection efficiency in first band, and has good efficiency of transmission to second band.
3) in like manner, step 2 is repeated) the Bragg reverberator of the second diffraction grating is carried out to the calculating of periodic thickness and dielectric thickness ratio, make its structure have higher reflection efficiency in second band.
4) according to formula
m λ=n
effa (sin α+sin β), and the grating equation being applicable to Bragg-EDG design
try to achieve other parameters of the first diffraction grating and the second diffraction grating.
5) in a word, first their Bragg reflector structure is first determined at design first diffraction grating and the second diffraction grating, and the structural parameters of Bragg reverberator are combined with grating equation the structural parameters of Bragg-EDG mono-and Bragg-EDG bis-are calculated and designs Bragg-EDG mono-and Bragg-EDG bis-, the transmissivity of wave band two will be taken into account when design the first diffraction grating simultaneously.
In order to better embody the present invention, according to principle of the present invention, the Bragg-EDG of a design silicon based silicon dioxide type, SiO 2 waveguide refractive index is n1=1.45, and etch layer is air, and refractive index is n2=1, first band centre wavelength is 800nm, the parameter of the first diffraction grating is as follows: a=546nm, d=332nm, d1=141nm, d2=191nm, incident angle α=-22.5 °, blazing angle θ=37.5 °, Rowland circle radius R
rC=170um, grating radius of circle R
grating=340um, the order of diffraction time m=-1.The parameter of the second diffraction grating is as follows: a=856.6nm, d=578.7nm, d
1=243.7nm, d
2=335nm, incident angle α=-22.5 °, blazing angle θ=42.5 °, Rowland circle radius R
rC=200um, grating radius of circle R
grating=400um, the order of diffraction time m=-1
According to above-mentioned parameter, We conducted simulation, result shows that this device first diffraction grating has carried out diffraction light splitting to the wave band that centre wavelength is 800nm, and light transmission first diffraction grating that centre wavelength is 1310nm wave band has carried out diffraction light splitting on the second diffraction grating, device size is little, and diffraction efficiency is high.
Above content is only and technological thought of the present invention is described; protection scope of the present invention can not be limited with this; every technological thought proposed according to the present invention, any change that technical scheme basis is done, within the protection domain all falling into claims of the present invention.
Claims (7)
1. a Bragg-concave diffraction grating wavelength division multiplexer for double grating two waveband, is characterized in that, comprises input waveguide (101), the first output waveguide array (102) and the second output waveguide array (202); The entry port (105) of input waveguide (101) and the exit ports (106) of the first output waveguide array (102) are positioned on the first Rowland circle, the entry port (105) of input waveguide (101) and the exit ports (206) of the second output waveguide array (202) are positioned on the second Rowland circle, and entry port (105) is the intersection point of the first Rowland circle and the second Rowland circle; The tangent place of the first Rowland circle and the first diffraction grating circle arranges the first diffraction grating (104), and the tangent place of the second Rowland circle and the second diffraction grating circle arranges the second diffraction grating (204).
2. the Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband according to claim 1, it is characterized in that, being the first free transmission region (103) between described entry port (105) to the first diffraction grating (104), is the second free transmission region (203) between entry port (105) to the second diffraction grating (204).
3. the Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband according to claim 1 and 2, it is characterized in that, the concave grating that described first diffraction grating (104) and the second diffraction grating (204) etch for Bragg cutting structure.
4. the Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband according to claim 3, is characterized in that, described concave grating adopts the concave grating be made up of the Bragg reflector array in the single cycle or multiple cycle.
5. the Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband according to claim 3, it is characterized in that, described first Rowland circle is inscribed within the first diffraction grating circle, second Rowland circle is inscribed within the second diffraction grating circle, and the first rowland diameter of a circle equals the first diffraction grating radius of a circle, second rowland diameter of a circle equals the second diffraction grating radius of a circle and it is characterized in that: the tangent place of the first Rowland circle and the first diffraction grating circle is the center of the first diffraction grating (104), concave surface first diffraction grating (104) adopts periodically Bragg reflecting surface structure to be arranged on the first diffraction grating circle, the tangent place of the second Rowland circle and the second diffraction grating circle is the center of concave surface second diffraction grating (204) that Bragg cutting structure etches, and concave surface second diffraction grating (204) adopts periodically Bragg reflecting surface structure to be arranged on the second diffraction grating circle.
6. the Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband according to claim 1, it is characterized in that, described first diffraction grating (104) and the second diffraction grating (204) arrange stacking formation by the material periodicities that two kinds of refractive indexes are different.
7. the Bragg-concave diffraction grating wavelength division multiplexer of double grating two waveband according to claim 6, is characterized in that, the width of the material that two kinds of refractive indexes of described first diffraction grating (104) are different is respectively d
1and d
2, the periodic thickness d of the first diffraction grating Bragg reverberator
12determined by 1-D photon crystal theory, wherein, d
12=d
1+ d
2; The width of the material that two kinds of refractive indexes that the second diffraction grating (204) adopts are different is respectively d
3and d
4, its periodic thickness d
34determined by 1-D photon crystal theory, wherein, d
34=d
3+ d
4.
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| CN201510373320.6A CN104914509A (en) | 2015-06-29 | 2015-06-29 | Double-grating two-waveband Bragg-concave face diffraction grating wavelength division multiplexer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2684177A1 (en) * | 2017-03-29 | 2018-10-01 | Universidad Carlos Iii De Madrid | Multiplexer and compact optical demultiplexer with a high number of channels (Machine-translation by Google Translate, not legally binding) |
| CN109283626A (en) * | 2018-11-06 | 2019-01-29 | 西安交通大学 | Compact Bragg reflector type concave diffraction grating wavelength division multiplexer and its design method |
| CN111226147A (en) * | 2017-08-03 | 2020-06-02 | 菲尼萨公司 | Echelle grating multiplexer or demultiplexer |
-
2015
- 2015-06-29 CN CN201510373320.6A patent/CN104914509A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| JOSHUA N.WINN，YOEL FINK等: "Omnidirectinal reflection from a one-dimensional photonic crystal", 《OPTICS LETTERS》 * |
| YOEL FINK，JOSHUA N. WINN等: "A Dielectric Omnidirectional Reflector", 《SCIENCE》 * |
| 李宝，朱京平，杜炳政: "基于Bragg反射面结构的衍射光栅设计与研究", 《物理学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2684177A1 (en) * | 2017-03-29 | 2018-10-01 | Universidad Carlos Iii De Madrid | Multiplexer and compact optical demultiplexer with a high number of channels (Machine-translation by Google Translate, not legally binding) |
| CN111226147A (en) * | 2017-08-03 | 2020-06-02 | 菲尼萨公司 | Echelle grating multiplexer or demultiplexer |
| CN111226147B (en) * | 2017-08-03 | 2021-08-17 | 菲尼萨公司 | Echelle grating multiplexer or demultiplexer |
| CN109283626A (en) * | 2018-11-06 | 2019-01-29 | 西安交通大学 | Compact Bragg reflector type concave diffraction grating wavelength division multiplexer and its design method |
| CN109283626B (en) * | 2018-11-06 | 2020-03-17 | 西安交通大学 | Compact Bragg reflector type concave diffraction grating wavelength division multiplexer and design method thereof |
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