CN106526752B - Directional coupler and coupling process for multimode lightguide 3dB beam splitting - Google Patents
Directional coupler and coupling process for multimode lightguide 3dB beam splitting Download PDFInfo
- Publication number
- CN106526752B CN106526752B CN201611033025.7A CN201611033025A CN106526752B CN 106526752 B CN106526752 B CN 106526752B CN 201611033025 A CN201611033025 A CN 201611033025A CN 106526752 B CN106526752 B CN 106526752B
- Authority
- CN
- China
- Prior art keywords
- waveguide
- intensive
- area
- gradual change
- burial type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2808—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs
- G02B6/2813—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs based on multimode interference effect, i.e. self-imaging
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The invention discloses a kind of directional coupler and coupling process for multimode lightguide 3dB beam splitting, including two groups of intensive waveguide arrays, every group of intensive waveguide array is made of side by side two or more burial type rectangular optical waveguides；Two groups of intensive waveguide arrays are divided into input area, the first gradual change taper area, coupled zone, the second gradual change taper area, output area；Input area is connected by the first gradual change taper area with coupled zone one end, and the other end of coupled zone is connected by the second gradual change taper area with output area；The distance between width and the burial type rectangular optical waveguide of the burial type rectangular optical waveguide of input area, output area, coupled zone are adjusted by the first gradual change taper area, the second gradual change taper area.The present invention realizes the 3dB beam splitting of multiple modes by the directional coupler of the multimode lightguide based on intensive waveguide array structure, have it is compact-sized, simple, it is easy to process to realize and other effects, can be applied to mode division multiplexing integrated optical circuit.
Description
Technical field
The present invention relates to integrated photon fields, more particularly relate to a kind of integrator for realizing multimode waveguide light beam splitting
Part structure.
Background technique
Nowadays, with the promotion of various emerging applications, such as: mobile interchange, cloud computing, Internet access points are every year with hundred
The quantity of ten thousand meters increases, and the annual growth of the information interaction amount of Internet is also above 40%, the appearance of each switching node in network
Amount demand is also up to Pb/s magnitude.The optical communication network and technology of 10Gb/s-100Gb/s of today, be difficult support with
These upper people demand growing to information content.Importantly, due to being influenced by fiber nonlinear effect, optical fiber
The physics limit that the data rate that middle single channel can transmit is determined already close to Shannon's law is difficult further to be mentioned
It is high.
Spatial reuse (also referred to as mode multiplexing) is obtaining in the world recently as another multiplexing dimension of photon
Extensive concern.Especially for transmission range, light network comes between several centimetres to two kilometers or so of short distance on piece or piece
Say, since number of nodes is numerous, there is higher requirement to the size, function and cost of optical module.Traditional wave division multiplex mode
It needs to use high-performance laser and its array, and needs to carry out the wavelength of laser and each passive device preferable
Control has comparable difficulty.Mode multiplexing technology can also be multiplied the message transmission rate in single planar optical waveguide.
Using the orthogonality of waveguide mode, multi-channel data transmission can be realized by single wavelength, therefore effectively avoid close
Collect in wavelength-division multiplex system the size that the rigors of wavelength stability are significantly reduced with entire optical interconnection module, cost and
Energy consumption.
The differences such as the propagation constant of each rank mode, mould shape of spot are very big in conventional multi-mode waveguide.And various traditional silicon
Base device cannot be directly extended to multimode situation substantially based on single mode waveguide design.More general processing multimode in the world
Mode be: each mode is demultiplexed into single mode waveguide first, is then handled respectively, last re-multiplexing to multimode waveguide.But
This mode, undoubtedly device size, control mode, in terms of there are problems that scalability.
Summary of the invention
1, the purpose of the present invention.
The present invention provides one kind and realizes light beam splitting integrated optical device structure in multimode lightguide, to solve in the prior art
Single mode waveguide beam splitting to the existing loss of multimode waveguide and be difficult to the problem of extending.
2, the technical solution adopted in the present invention.
Directional coupler proposed by the present invention for multimode lightguide 3dB beam splitting, including two groups of intensive waveguide arrays, often
The intensive waveguide array of group is made of side by side two or more burial type rectangular optical waveguides；Two groups of intensive waveguide arrays be divided into input area,
First gradual change taper area, coupled zone, the second gradual change taper area, output area；Input area passes through the first gradual change taper area and coupled zone
One end is connected, and the other end of coupled zone is connected by the second gradual change taper area with output area；Pass through the first gradual change taper area, second
Gradual change taper area adjusts the width and burial type rectangle light wave of the burial type rectangular optical waveguide of input area, output area, coupled zone
The distance between lead.
In further specific embodiment, the input area and output area: in every group of intensive waveguide array side by side
Burial type rectangular optical waveguide width is different, and spacing is equal between burial type rectangular optical waveguide.
In further specific embodiment, the coupled zone: the burial type square in every group of intensive waveguide array side by side
Shape optical waveguide is of same size, and spacing is each unequal between burial type rectangular optical waveguide.
In further specific embodiment, two groups of intensive waveguide arrays of the coupled zone: its burial type square side by side
Shape optical waveguide is symmetrically arranged with the center line between two groups of intensive waveguide arrays, i.e. two groups of intensive waveguide array outermost layer burial types
Two spacing of rectangular optical waveguide are identical, and two spacing of secondary outer layer burial type rectangular optical waveguide are identical, and so on.
In further specific embodiment, the burial type rectangular optical waveguide, the waveguide including a high refractive index
The top covering of sandwich layer, the under-clad layer of low-refraction and a low-refraction.
A kind of directional coupling method of multimode lightguide 3dB beam splitting,
Two groups of intensive waveguide arrays, every group of intensive waveguide array are arranged side by side by two or more burial type rectangular optical waveguides；
Input area is connected by the first gradual change taper area with coupled zone one end, and the other end of coupled zone is bored by the second gradual change
Shape area is connected with output area；
The burial type rectangle of input area, output area, coupled zone is adjusted by the first gradual change taper area, the second gradual change taper area
The distance between width and burial type rectangular optical waveguide of optical waveguide；
The light of different mode is inputted from the input area of first group of intensive waveguide array, is coupled by coupled zone, each
The light of mode will be exported by two groups of intensive waveguide arrays for being assigned to output area of constant power simultaneously, realize the 3dB of multimode
Light beam splitting；
The light of different mode is inputted from the input area of second group of intensive waveguide array, is coupled by coupled zone, each
The light of mode will be exported by two groups of intensive waveguide arrays for being assigned to output area of constant power simultaneously, realize the 3dB of multimode
Light beam splitting.
In further specific embodiment, the input area and output area are set and made in every group of intensive waveguide array
Burial type rectangular optical waveguide width side by side is different, and spacing is equal between burial type rectangular optical waveguide.
In further specific embodiment, burial side by side in coupled zone i.e. every group of intensive waveguide array is set
Type rectangular optical waveguide is of same size, and spacing is each unequal between burial type rectangular optical waveguide.
In further specific embodiment, two groups of intensive waveguide arrays of the coupled zone are set: its burial side by side
Type rectangular optical waveguide is symmetrically arranged with the center line between two groups of intensive waveguide arrays, i.e., two groups of intensive waveguide array outermost layers are covered
Two spacing for burying type rectangular optical waveguide are identical, and two spacing of secondary outer layer burial type rectangular optical waveguide are identical, and so on.
In further specific embodiment, the burial type rectangular optical waveguide, by the waveguide core layer of high refractive index outside
Wrap up the under-clad layer an of low-refraction and the top covering of a low-refraction in portion.
3, beneficial effects of the present invention.
(1) present invention may be implemented to output and input between multimode waveguide, the 3dB directional couple of multiple modes simultaneously, easily
In extension.
(2) structure of the invention is compact simple, and single structure can simultaneously be handled multiple modes, without using passing
The demultiplexing of system-single mode processing-multiplexing mode, can greatly reduce the complexity of device, improve the integrated level of chip.
(3) manufacture craft of the present invention is simple, not comprising any additional production process, with common burial type optical waveguide system
It is consistent to make technique, reduces cost of manufacture.
Detailed description of the invention
The floor map of targeted multimode lightguide in Fig. 1 present invention, it may be assumed that intensive waveguide array.
The cross-sectional structure schematic diagram of the intensive waveguide array of Fig. 2.
Directional coupling structure schematic diagram in Fig. 3 present invention.
The cross-sectional structure schematic diagram of the coupled zone Fig. 4.
The TE that the intensive waveguide array of n=2 Fig. 5 is supported1Mode.
The TE that the intensive waveguide array of n=2 Fig. 6 is supported2Mode.
Fig. 7 TE1The light field figure that the light of mode transmits in directional coupler of the invention.
Fig. 8 TE2The light field figure that the light of mode transmits in directional coupler of the invention.
Specific embodiment
Embodiment 1
As shown in figures 1 and 2, multimode lightguide targeted in the present invention, is by n(n > 1) the different burial of root width
The intensive waveguide array 1 that type rectangular optical waveguide 1 (1) ~ 1 (n) is equidistantly formed side by side is constituted, and width is respectively W1~Wn, therebetween
Away from for g.The burial type rectangular optical waveguide also has a low-refraction other than with high index waveguide sandwich layer
Under-clad layer 2 and a low-refraction top covering 3.
As shown in figure 3, directional coupling structure of the invention includes that the intensive waveguide array 4 of the first input and the second input are close
Collect waveguide array 5；It is L that the intensive waveguide array 4 of first input and the second intensive waveguide array 5 of input, which pass through length,2First gradual change
Tapered zone 6 is connect with coupled zone 7.
As shown in figures 3 and 4, coupled zone 7 is made of side by side 2n root burial type rectangular optical waveguide.These burial types therein
Rectangular optical waveguide it is of same size, be designated as W, spacing between burial type rectangular optical waveguide is different, is designated as g1~gn.Coupled zone 7 with
Center line symmetrical setting between two groups of intensive waveguide arrays, that is to say, that outermost two spacing are mutually all g1, secondary outer layer
Two spacing be mutually all g2, and so on.
As shown in figure 3, coupled zone 7 is L by length2Second gradual change taper area 8 and the first output-bound waveguide array 9 and
Second output-bound waveguide array 10 is connected.
The working principle of directional coupler of the invention is that the light of different mode is defeated from the first intensive waveguide array 4 of input
Enter, after coupled zone 7, the light of each mode will be assigned to 9 He of the first output-bound waveguide array by constant power simultaneously
Second output-bound waveguide array 10 realizes the 3dB light beam splitting of multimode.It is close from the second input due to the symmetry of total
Collect the light that waveguide array 5 inputs, a same coupling process will be passed through, it may be assumed that the light of different mode inputs intensive wave from second
The input of array 5 is led, after coupled zone 7, the light of each mode will be assigned to the first output-bound wave by constant power simultaneously
Array 9 and the second output-bound waveguide array 10 are led, realizes the 3dB light beam splitting of multimode.
Embodiment 2
In two modes for the 3dB beam splitting directional coupler of (that is: n=2).
Select waveguide core layer material for silicon, clad material is all silica up and down for waveguide.The intensive wave output and input
Leading array structure parameter is W1=0.4 μm, W2=0.55 μm, g=0.12 μm.Its two mode supported is Fig. 5, shown in 6, is marked respectively
For TE1And TE2Mode, coupled zone parameter are W=0.45 μm, g1=0.12 μm, g2=0.195 μm, couple section length L1=21.8 μm, gradually
Become taper section length L1=1.0μm。
As shown in fig. 7, TE1The light of mode is from the intensive waveguide array input of an input, by the orientation coupling in the present invention
After clutch, by the TE of two output-bound waveguide arrays of distribution of constant power1In mode, and two output-bound waveguide arrays
TE2Mode is not energized, and has good crosstalk performance.
As shown in figure 8, TE2The light of mode is from the intensive waveguide array input of an input, by the orientation coupling in the present invention
After clutch, by the TE of two output-bound waveguide arrays of distribution of constant power12In mode.And two output-bound waveguide arrays
TE1Mode is not energized, and has good crosstalk performance.
Claims (7)
1. a kind of directional coupler for multimode lightguide 3dB beam splitting, it is characterised in that: including two groups of intensive waveguide arrays,
Every group of intensive waveguide array is made of side by side two or more burial type rectangular optical waveguides；Two groups of intensive waveguide arrays are divided into input
Area, the first gradual change taper area, coupled zone, the second gradual change taper area, output area；Input area by the first gradual change taper area with couple
Area one end is connected, and the other end of coupled zone is connected by the second gradual change taper area with output area；Pass through the first gradual change taper area,
Two gradual change taper areas adjust the width and burial type rectangular light of the burial type rectangular optical waveguide of input area, output area, coupled zone
The distance between waveguide；Burial type rectangular optical waveguide width in every group of intensive waveguide array side by side is different, burial type square
Spacing is equal between shape optical waveguide.
2. the directional coupler of multimode lightguide 3dB beam splitting according to claim 1, it is characterised in that the coupled zone
Two groups of intensive waveguide arrays: its burial type rectangular optical waveguide side by side is symmetrically arranged with the center line between two groups of intensive waveguide arrays
Column, i.e., two spacing of two groups intensive waveguide array outermost layer burial type rectangular optical waveguides are identical, secondary outer layer burial type rectangular light
Two spacing of waveguide are identical, and so on.
3. the directional coupler of multimode lightguide 3dB beam splitting according to claim 1, it is characterised in that: the burial
Type rectangular optical waveguide, waveguide core layer including a high refractive index, the under-clad layer of low-refraction and low-refraction
Top covering.
4. a kind of directional coupling method of the directional coupler using multimode lightguide 3dB beam splitting described in claim 1, special
Sign is:
Two groups of intensive waveguide arrays, every group of intensive waveguide array are arranged side by side by two or more burial type rectangular optical waveguides；
Input area is connected by the first gradual change taper area with coupled zone one end, and the other end of coupled zone passes through the second gradual change taper area
It is connected with output area；
The burial type rectangle light wave of input area, output area, coupled zone is adjusted by the first gradual change taper area, the second gradual change taper area
The distance between width and burial type rectangular optical waveguide for leading；
The light of different mode is inputted from the input area of first group of intensive waveguide array, is coupled by coupled zone, each mode
Light will be exported by two groups of intensive waveguide arrays for being assigned to output area of constant power simultaneously, realize the 3dB light point of multimode
Beam；
The light of different mode is inputted from the input area of second group of intensive waveguide array, is coupled by coupled zone, each mode
Light will be exported by two groups of intensive waveguide arrays for being assigned to output area of constant power simultaneously, realize the 3dB light point of multimode
Beam.
5. the directional coupling method of multimode lightguide 3dB beam splitting according to claim 4, it is characterised in that described in being arranged
Input area and output area make the burial type rectangular optical waveguide width in every group of intensive waveguide array side by side different, burial type
Spacing is equal between rectangular optical waveguide.
6. the directional coupling method of multimode lightguide 3dB beam splitting according to claim 4, it is characterised in that the coupling is arranged
Close two groups of intensive waveguide arrays in area: its burial type rectangular optical waveguide side by side is with the center line between two groups of intensive waveguide arrays
It is symmetrically arranged, i.e., two spacing of two groups intensive waveguide array outermost layer burial type rectangular optical waveguides are identical, secondary outer layer burial type
Two spacing of rectangular optical waveguide are identical, and so on.
7. the directional coupling method of multimode lightguide 3dB beam splitting according to claim 4, it is characterised in that the burial
Type rectangular optical waveguide, by the under-clad layer and low-refraction that wrap up low-refraction outside the waveguide core layer of high refractive index
Top covering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033025.7A CN106526752B (en) | 2016-11-23 | 2016-11-23 | Directional coupler and coupling process for multimode lightguide 3dB beam splitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033025.7A CN106526752B (en) | 2016-11-23 | 2016-11-23 | Directional coupler and coupling process for multimode lightguide 3dB beam splitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106526752A CN106526752A (en) | 2017-03-22 |
| CN106526752B true CN106526752B (en) | 2019-07-26 |
Family
ID=58356181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611033025.7A Active CN106526752B (en) | 2016-11-23 | 2016-11-23 | Directional coupler and coupling process for multimode lightguide 3dB beam splitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106526752B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842430A (en) * | 2017-04-05 | 2017-06-13 | 电子科技大学 | A kind of asymmetrical directional coupler |
| CN111786067A (en) * | 2020-06-23 | 2020-10-16 | 深圳市信维通信股份有限公司 | Broadband Directional Coupling Circuit Structure for RF Front End |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5570442A (en) * | 1992-11-19 | 1996-10-29 | Mitsubishi Gas Chemical Company, Inc. | Design and manufacture of an optimized waveguide-type multiple branched star coupler |
| JPH08292340A (en) * | 1995-04-13 | 1996-11-05 | Alcatel Nv | Optical branch |
| CN1361874A (en) * | 1999-05-21 | 2002-07-31 | 内诺维什技术公司 | Nanophotonic directional coupler device |
| CN105467518A (en) * | 2015-12-29 | 2016-04-06 | 北京大学 | Star coupler for adjustment of light power division ratio and realization method for same |
-
2016
- 2016-11-23 CN CN201611033025.7A patent/CN106526752B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5570442A (en) * | 1992-11-19 | 1996-10-29 | Mitsubishi Gas Chemical Company, Inc. | Design and manufacture of an optimized waveguide-type multiple branched star coupler |
| JPH08292340A (en) * | 1995-04-13 | 1996-11-05 | Alcatel Nv | Optical branch |
| CN1361874A (en) * | 1999-05-21 | 2002-07-31 | 内诺维什技术公司 | Nanophotonic directional coupler device |
| CN105467518A (en) * | 2015-12-29 | 2016-04-06 | 北京大学 | Star coupler for adjustment of light power division ratio and realization method for same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106526752A (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10656333B2 (en) | Two-stage adiabatically coupled photonic systems | |
| US10168481B2 (en) | Method and system for grating couplers incorporating perturbed waveguides | |
| CN111239910B (en) | A photonic lantern type degenerate module multiplexer/demultiplexer and transmission method | |
| Asghari et al. | Energy-efficient communication | |
| US10156679B2 (en) | Photonic chips based on multimode fiber-to-waveguide coupling | |
| US10222549B2 (en) | Mode multiplexer/demultiplexer and switching node | |
| CN104459881B (en) | Wavelength division multiplexing type silicon substrate optical receiving chip insensitive to polarization | |
| US7889996B2 (en) | Optical-signal-path routing in a multi-chip system | |
| CN102902024B (en) | Method for realizing optical coupling of multi-core fiber and photoelectron chip array | |
| JP2531634B2 (en) | Optical multiplexer / demultiplexer | |
| US20100266276A1 (en) | Broadband and wavelength-selective bidirectional 3-way optical splitter | |
| CN206848526U (en) | Silicon substrate WDM optical transceiver modules | |
| Zhu et al. | Efficient silicon integrated four-mode edge coupler for few-mode fiber coupling | |
| CN106526752B (en) | Directional coupler and coupling process for multimode lightguide 3dB beam splitting | |
| CN111239895B (en) | A waveguide coupling structure and optical transmitter system | |
| CN107561646A (en) | Optical waveguide polarization separator and its manufacture method | |
| Zhuang et al. | On-chip hybrid demultiplexer for mode and coarse wavelength division multiplexing | |
| CN106877169A (en) | A kind of insensitive laser structure of hetero-junctions heat and manufacture method based on SOI | |
| CN115980926B (en) | A hybrid integrated multimode waveguide coupler | |
| CN212872974U (en) | Two-channel wavelength division multiplexing or demultiplexing optical device based on planar optical waveguide | |
| US10094980B2 (en) | Three-dimensional space-division Y-splitter for multicore optical fibers | |
| KR101481148B1 (en) | Arrayed Waveguide Collimators | |
| CN108599856B (en) | Optical Splitter System Based on 8×1 Mode Coupled Receiver | |
| CN109669233A (en) | Fill the rectangular lattice photonic crystal fiber wavelength multiplexer/demultiplexer of benzene | |
| Zhao et al. | 84-Channel ultra-dense silicon photonics optical IO |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |