CN106970443B - A kind of multichannel dual-polarization mode multiplexing-demultiplexer - Google Patents
A kind of multichannel dual-polarization mode multiplexing-demultiplexer Download PDFInfo
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- CN106970443B CN106970443B CN201710243872.4A CN201710243872A CN106970443B CN 106970443 B CN106970443 B CN 106970443B CN 201710243872 A CN201710243872 A CN 201710243872A CN 106970443 B CN106970443 B CN 106970443B
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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
- G02B6/29302—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 based on birefringence or polarisation, e.g. wavelength dependent birefringence, polarisation interferometers
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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
- G02B6/29379—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 characterised by the function or use of the complete device
Abstract
The invention discloses a kind of multichannel dual-polarization mode multiplexing-demultiplexers.The input waveguide other end is connected to one end after a plurality of multimode composited waveguide is mutually sequentially connected, and the big end for being bent tapered waveguide is connect with polarization beam apparatus, two output ends of polarization beam apparatus respectively with export horizontal electro magnetic mould monomode optical waveguide；Multimode composited waveguide is made of input multimode lightguide, the wide conical optical waveguide in evolution area and output multimode lightguide, bending tapered waveguide is made of preceding S-shaped bending optical waveguide structure, the narrow conical optical waveguide in evolution area and rear S-shaped bending optical waveguide structure, and the narrow conical optical waveguide of the wide conical optical waveguide in evolution area and evolution area approaches and super model evolution occurs.Multiple signals are respectively loaded on the eigen mode of same multimode composited waveguide by the present invention, formation mode palarization multiplexing, for systems such as mode polarization multiplexed optical letters, have many advantages, such as that simple process, structure be simple, big bandwidth High Extinction Ratio.
Description
Technical field
The present invention relates to a kind of multiplexing-demultiplexers, are especially for one kind of polarization and mode multiplexing system
Multichannel dual-polarization mode multiplexing-demultiplexer.
Background technique
Increasingly developed with planar optical waveguide integrated device technology, monolithic integrated device number rapidly increases, and integrates system
System complexity promptly improves, and the polarization and each rank mode for how making full use of signal light different mention to increase traffic capacity
High bandwidth increasingly causes the concern of people.
Since each mode is orthogonal independent solution in optical fiber or waveguide, each mode is spatially mutually folded
Add.Compared with multicore multiplexing, with smaller volume, higher integrated level is may be implemented in higher information density,
Have bigger advantage in integrated angle, particularly with the communication of the big bandwidth of short distances such as data center there is bigger suction
Gravitation.Additionally due to most of planar optical waveguide devices have it is very strong polarization correlated, therefore can be flexibly right on piece
The separation and conversion of different polarization, realize the polarizing transparent of device, facilitate the workload for reducing device design, reduce system
Size and complexity.A variety of multiplex modes, which are used in mixed way, may be implemented more communication channels, the optical link of bigger bandwidth,
The effective information density for improving light is the developing direction of the following interconnection.
In terms of the performance requirement of device, mode polarization multiplexer has very high requirement to performance.On the one hand, it
It asks device to possess bandwidth big as far as possible, in the system that big metering device integrates, the bottle of limitation whole system bandwidth will not be become
Neck；On the other hand, it is desirable that device can have biggish extinction ratio, and crosstalk is minimized in high-speed communication system, also be subsequent
There are certain surpluses for the design of device.
Summary of the invention
In order to solve the problems, such as background technique, the invention proposes a kind of multichannel dual-polarization mode multiplexing-solutions
Multiplexer.
The technical solution adopted by the present invention is that:
The present invention includes input waveguide, multimode composited waveguide and bending tapered waveguide, and input waveguide one end is as multiple
With the input/output terminal of-demultiplexer, the input waveguide other end is connected to after a plurality of multimode composited waveguide is mutually sequentially connected
One end, a plurality of multimode composited waveguide be mutually sequentially connected after the other end as the one of output of multiplexing-demultiplexer/defeated
Enter end, every multimode composited waveguide is coupled with the bending tapered waveguide that it is nearby arranged and connect, and is bent the big end of tapered waveguide
Connect with the input terminal of polarization beam apparatus, two output ends of polarization beam apparatus respectively with output transverse electric mode monomode optical waveguide
With output TM mode monomode optical waveguide, output transverse electric mode monomode optical waveguide and output TM mode monomode optical waveguide are as multiplexing-solution
Remaining input/output end of multiplexer.
Every multimode composited waveguide is by input multimode lightguide, the wide conical optical waveguide in evolution area and output multimode
Optical waveguide composition, every bending tapered waveguide by preceding S-shaped bending optical waveguide structure, the narrow conical optical waveguide in evolution area and
S-shaped bending optical waveguide structure is connected in sequence afterwards, the wide conical optical waveguide in evolution area in every multimode composited waveguide with
The narrow conical optical waveguide in evolution area in its corresponding described bending tapered waveguide approaches and super model evolution occurs, so that corresponding
The wide conical optical waveguide in evolution area and evolution area narrow conical optical waveguide mineralizing evolution area.
Spacing between the narrow conical optical waveguide of the wide conical optical waveguide in evolution area and evolution area in every place's evolution area is identical, and
And every place's spacing between the narrow conical optical waveguide of the wide conical optical waveguide in evolution area and evolution area is identical.
Input multimode lightguide, the wide conical optical waveguide in evolution area, output multimode light wave near at each evolution area
It leads, the length or width of preceding S-shaped bending optical waveguide structure, the narrow conical optical waveguide in evolution area and rear S-shaped bending optical waveguide structure
Or the size of length and width combination makes the transverse electric mode and horizontal magnetic of the most high-order by the wide conical optical waveguide in evolution area
First gradually super model of the coupling evolution at major limitation in the narrow conical optical waveguide in evolution area of mould, is then evolved into completely and is limited in
Transverse electric mode basic mode and TM mode basic mode in S-shaped bending optical waveguide structure afterwards.
So that when as demultiplexer, after input waveguide (10) inputs the not multimode optical signal of same order, every warp
It crosses an evolution area transverse electric mode of most high-order in current optical signal and TM mode develop away, and is evolved into basement membrane, then pass through
Polarization beam apparatus and output transverse electric mode monomode optical waveguide, output TM mode monomode optical waveguide be separated into transverse electric mode and TM mode into
Row output.Situation is opposite with the above process when as multiplexer.
The width of the input multimode lightguide of each multimode composited waveguide since one of connection input waveguide successively
Reduce, and the dual-polarization eigen mode quantity supported is incremented by successively 2 since 2.
In every multimode composited waveguide, the width for exporting multimode lightguide is less than the width of input multimode lightguide, develops
The width at the wide conical optical waveguide both ends in area is respectively equal to export multimode lightguide and inputs the width of multimode lightguide.
The high-order mode that input multimode lightguide is inputted is transverse electric mode or TM mode.
The taper of the wide conical optical waveguide in evolution area is all satisfied adiabatic condition, i.e., optical signal is after conical optical waveguide
New mode is not excited.
The output end of S type bent lightguide is also connected with a tool there are two output port and by transverse electric basic mode and horizontal magnetic base
The separated polarization beam apparatus of mould.
The wide conical optical waveguide width in the evolution area is gradually reduced or increases, and big end width can support transverse electric mode
With the high-order mode of TM mode；The narrow conical optical waveguide width in evolution area gradually increases or reduces, and big end width is only capable of supporting horizontal
Electric basic mode and horizontal magnetic basic mode.
The beneficial effects of the present invention are:
Multiple signals are respectively loaded on 2N eigen mode of same multimode composited waveguide by the present invention, formation mode
Palarization multiplexing.
The present invention can be used for the systems such as mode polarization multiplexed optical letter, and simple process, structure are simple, reduce original structure
Size, there are the advantages such as big, the big bandwidth High Extinction Ratio of tolerance.
Detailed description of the invention
Fig. 1 is the embodiment of the present invention schematic diagram.
Fig. 2 is embodiment device architecture schematic diagram.
Fig. 3 is each passage experiment result figure of embodiment device architecture.
In figure: 10, input waveguide, the 11, first input multimode lightguide, the 12, second input multimode lightguide ...,
1n, the n-th input multimode lightguide ..., 1N, N input multimode lightguide, and 1N+1, input monomode optical waveguide, 21, first develops
The wide conical optical waveguide in area, the 22, second wide conical optical waveguide ... in evolution area, 2n, the n-th wide conical optical waveguide ... in evolution area, 2N,
The wide conical optical waveguide in N evolution area, the 31, first output multimode lightguide, the 32, second output multimode lightguide ..., 3n, n-th
Multimode lightguide ... is exported, 3N, N export multimode lightguide, S type bent lightguide before 41, first, S type before 42, second
Bent lightguide ..., S type bent lightguide ... before 4n, n-th, S type bent lightguide before 4N, N, S type is curved after 61, first
Bent optical waveguide, S type bent lightguide ... after 62, second, S type bent lightguide ... after 6n, n-th, S type is bent after 6N, N
Optical waveguide, the 51, first narrow conical optical waveguide in evolution area, the 52, second narrow conical optical waveguide ... in evolution area, 5n, the n-th evolution area are narrow
Conical optical waveguide ..., 5N, the narrow conical optical waveguide in N evolution area, the 71, first polarization beam apparatus, the 72, second polarization beam splitting
Device ..., 7n, the n-th polarization beam apparatus ..., 7N, N polarization beam apparatus, the 81, first transverse electric mode monomode optical waveguide, 82, second is horizontal
Electric mould monomode optical waveguide ..., 8n, the n-th transverse electric mode monomode optical waveguide ..., 8N, N transverse electric mode monomode optical waveguide, 8 (N+1),
N+1 transverse electric mode monomode optical waveguide, the 91, first TM mode monomode optical waveguide, the 92, second TM mode monomode optical waveguide ..., 9n,
N TM mode monomode optical waveguide ..., 9N, N TM mode monomode optical waveguide, 9 (N+1), N+1 TM mode monomode optical waveguide.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, present invention specific implementation includes N number of multimode composited waveguide and N number of bending tapered waveguide and N rank
Input multimode lightguide 10,11,12 ..., 1n ..., 1N, be multimode lightguide, the n-th input multimode lightguide is used for transmission
2n eigen mode, n=1,2 ... N, N > 0.Only illustrate by taking demultiplexer as an example below, the structure of multiplexer is identical but input is defeated
It is opposite with demultiplexer out.
N-th multimode composited waveguide is by the n-th input multimode lightguide 1n, the wide conical optical waveguide 2n in the n-th evolution area, the n-th output
Multimode lightguide 3n is constituted, and the n-th bending tapered waveguide is by S-shaped bending optical waveguide structure 4n, the n-th narrow cone of light in evolution area before n-th
S-shaped bending optical waveguide structure 6n is constituted after waveguide 5n and n-th.
As shown in Figure 1,10 input terminal of input waveguide, as device input, 10 output end of input waveguide successively connects
Connect the wide conical optical waveguide 21, first in the first input multimode lightguide 11, the first evolution area export multimode lightguide 31 ..., n-th
Input multimode lightguide 1n, the wide conical optical waveguide 2n in the n-th evolution area, n-th output multimode lightguide 3n ..., N input multimode
Optical waveguide 1N, N evolution area wide conical optical waveguide 2N and N export multimode lightguide 3N.
As shown in Figure 1, the wide conical optical waveguide 2n in the n-th evolution area is nearby equipped with the narrow conical optical waveguide 5n in the n-th evolution area, structure
At the n-th evolution area.The end the S-shaped bending optical waveguide structure 4n successively S after the narrow conical optical waveguide 5n in the n-th evolution area, n-th before n-th
An input terminal of the n-th polarization beam apparatus 7n is connected to after shape bending optical waveguide structure 6n, two of the n-th polarization beam apparatus are defeated
Exit port is connect with the n-th output transverse electric mode monomode optical waveguide 8n, the n-th output TM mode monomode optical waveguide 9n respectively, n=1 ...,
N.N exports multimode lightguide 3N and all output transverse electric mode monomode optical waveguides and output TM mode monomode optical waveguide together
Output end as device.
As shown in Figure 1, S type bent lightguide 6n is connected with the n-th polarization beam apparatus 7n after n-th, two of polarization beam apparatus
Output end exports transverse electric mode and TM mode respectively, and respectively by the n-th transverse electric mode output waveguide 8n and the n-th TM mode output wave
Lead 9n output.
The wide conical optical waveguide 2n in n-th evolution area is close with the narrow conical optical waveguide 5n in the n-th evolution area super model gradually occurs
Develop, each evolution area can generate transverse electric mode simultaneously and the super model of TM mode develops.
First input multimode lightguide 11, second input multimode lightguide 12 ..., N input multimode lightguide 1N width
Degree is sequentially reduced, and each self-supporting at least 2,4 ..., 2 × N number of dual-polarization eigen mode.Meanwhile first exports multimode lightguide
31, the second output multimode lightguide 32 ..., the width of N output multimode lightguide 3N be sequentially reduced, and each self-supporting is at least
Including transverse electric mode and TM mode 2,4 ..., 2N eigen mode.
Width of the n-th output multimode lightguide 3n width less than the n-th input multimode lightguide 1n.
The wide conical optical waveguide 21 in first evolution area, the wide conical optical waveguide 22 in the second evolution area ..., the wide taper in N evolution area
It is equal that the width at optical waveguide 2N head and the tail both ends is respectively equal to the duct width being attached thereto.The cone of the wide conical optical waveguide in evolution area
Degree is all satisfied adiabatic condition, i.e., light field is not by exciting new mode after conical optical waveguide.Meanwhile the first narrow cone in evolution area
Shape optical waveguide 51, the narrow conical optical waveguide 52 in the second evolution area ..., the width at the narrow conical optical waveguide 5N head and the tail both ends in N evolution area
The duct width being respectively equal to attached thereto is equal.The taper of the narrow conical optical waveguide in evolution area is all satisfied adiabatic condition, i.e. light field
By new mode is not excited after conical optical waveguide.
Specific implementation can by setting n-th before S-shaped bending optical waveguide structure 4n, the narrow conical optical waveguide 5n in the n-th evolution area and
The length of S-shaped bending optical waveguide structure 6n to meet the following conditions after n-th: wide by the n-th evolution area at the n-th evolution area
First gradually coupling evolution develops at major limitation in the n-th evolution area the transverse electric mode and TM mode of the most high-order of conical optical waveguide 2n
Super model in the narrow conical optical waveguide 5n in area, is then evolved into the cross after being limited in n-th in S-shaped bending optical waveguide structure 6n completely
Electric mould basic mode and TM mode basic mode.
It can also be made by the way that the width of the wide conical optical waveguide 2n and narrow conical optical waveguide 5n in the n-th evolution area in the n-th evolution area is arranged
Above-mentioned condition must be met.Can by with n-th input multimode lightguide 1n and preceding S type bent lightguide 4n be connected that
The effective refractive index approximation of the effective refractive index and the waveguide of other end super model of holding super model waveguide is realized.
It can also outputting and inputting waveguide, n-th develop by the setting wide conical optical waveguide 2n in the n-th evolution area and its both ends
S shape bending optical waveguide structure 6n after S-shaped bending optical waveguide structure 4n and n-th before the n-th of the narrow conical optical waveguide 5n in area and its both ends
So that meeting above-mentioned condition.
It is wherein preferred, the n-th evolution area multimode conical optical waveguide 2n and the narrow conical optical waveguide 5n length phase in the n-th evolution area
Deng, the input of S type bent lightguide 4n and n-th multimode lightguide 1n equal length before n-th, after n-th S type bent lightguide 6n with
N-th output multimode lightguide 3n equal length.
Course of work when illustrating below using the present invention as demultiplexer:
Multimode input waveguide 10 is the multimode transmissions waveguide that can transmit N number of orthogonal transverse electric mode and N number of TM mode, by 2
× N number of orthogonal modes is loaded onto evolution region input multimode lightguide 11.
2 loaded × N number of optical signal is successively more by the wide output of conical optical waveguide 21, first in wherein the first evolution area
Mould optical waveguide 31, second inputs multimode lightguide 12, the wide conical optical waveguide 22, second in the second evolution area exports multimode lightguide
32 ..., n-th input multimode lightguide 1n, the wide conical optical waveguide 2n in the n-th evolution area, n-th output multimode lightguide 3n ..., N
Input multimode lightguide 1N, N conical optical waveguide 2N, N output multimode lightguide 3N work as optical signal in this transmission process
When by n-th a evolution region (n=1,2 ... N), n rank transverse electric (TE) high-order mode and the horizontal magnetic of m rank (TM) in multimode waveguide are high
Rank mould is developed by super model simultaneously, is gradually evolved by high-order mode of the major limitation in multimode waveguide and is limited in narrow conical wave
Super model in leading, transverse electric (TE) basic mode and horizontal magnetic (TM) basic mode being eventually converted into S type output optical waveguide.Therefore same
Evolution area can export 2 kinds of modes of transverse electric mode and TM mode simultaneously.
The wide conical optical waveguide 21 in first evolution area, the wide conical optical waveguide 22 in the second evolution area ..., evolution area n evolution area
Wide conical optical waveguide 2n ..., the wide conical optical waveguide 2N in N evolution area；The narrow conical optical waveguide 51, second in first evolution area develops
The narrow conical optical waveguide 52 in area, ..., the narrow conical optical waveguide 5n in the n-th evolution area, ..., the narrow conical optical waveguide 5N in N evolution area, etc.
It is gradual structure, taper meets adiabatic condition, and its spacing is kept constant.
N-th input multimode waveguide 1n, the wide tapered transmission line 2n of the n-th multimode, n-th output multimode waveguide 3n in high-order mode into
S type optical waveguide 6n after S type waveguide 4n, the narrow tapered transmission line 5n in evolution area, n-th before entering n-th, and be eventually converted into transverse electric basic mode and
Horizontal magnetic basic mode.By in the n-th input of design multimode waveguide 1n, the wide tapered transmission line 2n of the n-th multimode, the n-th output multimode waveguide 3n
High-order mode makes into the width and length of S type optical waveguide 6n after S type waveguide 4n, the narrow tapered transmission line 5n in evolution area, n-th before n-th
The high-order mode optical signal is evolved into high-order super model of the major limitation in narrow tapered transmission line, and passes through S type after rear S type waveguide n-th
Transverse electric basic mode and horizontal magnetic basic mode are drawn and be eventually converted into super model by optical waveguide 6n.After last n-th the S type end optical waveguide 6n with
Polarization beam apparatus 7n be connected, by same optical waveguide transverse electric basic mode and horizontal magnetic basic mode respectively from transverse electric mode output end 8n and cross
Magnetic mould output end 9n output.
With transmission of the optical signal in the waveguide of main line, multimode waveguide both ends width is gradually reduced, and high-order mode successively develops
It is exported for basic mode from polarization beam apparatus, only remains transverse electric basic mode and transverse electric base of the horizontal magnetic basic mode in the waveguide of main line, in the waveguide of main line
Mould and horizontal magnetic basic mode are exported from two output ports respectively through polarization beam apparatus.
The specific embodiment of the invention is as follows:
Select the silicon nanowires optical waveguide for being based on silicon-on-insulator (SOI) material: its sandwich layer is silicon materials, with a thickness of
220nm, refractive index 3.4744；Its under-clad layer, top covering material are SiO2, with a thickness of 2 μm, refractive index 1.4404.It examines
Worry central wavelength is 1550nm, 2 × N=10 of pattern count, device junction composition such as Fig. 2.
For N=5 evolution area, choosing wide tapered transmission line two sides width is respectively the first wide tapered transmission line: 2.3 μm,
1.8 μm, the second wide tapered transmission line: 1.95 μm, 1.7 μm, the wide tapered transmission line of third: 1.4 μm, 1.15 μm, the 4th wide conical wave
It leads: 1.15 μm, 0.78 μm, the 5th wide tapered transmission line: 0.78 μm, 0.48 μm wide tapered transmission line two sides multimode waveguide width and cone
Shape waveguide two sides width is equal, and preceding S type curved waveguide width is unified for 0.12 μm, the height of preceding S type waveguide is respectively 0.5 μm,
0.5 μm, 0.9 μm, 0.9 μm, 0.9 μm, length are respectively 5 μm, 11 μm, 16 μm, 24 μm, 24 μm,
0.12 μm of interval holding between two conical optical waveguide of width is constant, the narrow conical optical waveguide two sides width in evolution area
It is equal with front and back S type curved waveguide width, rear S type curved waveguide width be respectively as follows: 0.28 μm, 0.32 μm, 0.3 μm, 0.3 μm,
0.26 μm, height is respectively 1.2 μm, 1.2 μm, 1.2 μm, 1.2 μm, 1.2 μm, and length is respectively 19 μm, 38 μm, 21 μm, 50 μ
M, 60 μm, polarization beam apparatus is terminated after rear S type waveguide.0.45 μm of duct width of device rearmost end basic mode, basic mode waveguide connects polarization
Beam splitter.
For 5 × 2 designed pattern demultiplexers, according to the reversible principle of optical path, if it is used in turn,
For 2 × 5 pattern multiplexers, it can be achieved that the function of mode multiplexing.It is 2 × 5 pattern multiplexers and 5 × 2 mode solutions by one
Multiplexer is connected by one section of multimode waveguide, constitutes a channel transmission link.It is respectively that light is multiple from 2 × 5 modes
It is inputted with the input waveguide of device, after 2 × 5 pattern multiplexers, is separately converted to each rank eigen mode of main line multimode waveguide, it is real
The function of mode multiplexing is showed；It is more by 5 × 2 pattern demultiplexers after transmitting a distance along main line multimode waveguide
Each rank eigen mode of mould waveguide is respectively transformed into the basic mode of corresponding output waveguide again, realizes the function of mode demultiplexing.
Experiment proves that device of the invention, in 1520-1610nm wave-length coverage, all channels, which can be realized, to be less than
The Insertion Loss of 2dB and the extinction ratio of 20dB have biggish bandwidth and extinction ratio, and each passage experiment result is as shown in figure 3, figure
In, a-j has been respectively represented when optical signal is inputted from 10 input ports, is demultiplexed by 2 × 5 pattern multiplexers and 5 × 2 modes
With the signal exported after device from 10 ports.
As it can be seen that multiple signals are respectively loaded on same multimode composited waveguide and shape by of the invention can be realized in figure
It is multiplexed at mode polarization, the significant technical advantage such as big, big bandwidth High Extinction Ratio with tolerance.
Above-described embodiment is used to illustrate the present invention, rather than limits the invention, in spirit of the invention and
In scope of protection of the claims, to any modifications and changes that the present invention makes, protection scope of the present invention is both fallen within.
Claims (6)
1. a kind of multichannel dual-polarization mode multiplexing-demultiplexer, it is characterised in that: the present invention includes input waveguide, multimode
Composited waveguide and bending tapered waveguide, input waveguide (10) one end is as multiplexing-demultiplexer input/output terminal, input
Optical waveguide (10) other end is connected to one end after a plurality of multimode composited waveguide is mutually sequentially connected, and a plurality of multimode composited waveguide is interdependent
The other end after secondary connection as the one of input/output end of multiplexing-demultiplexer, every multimode composited waveguide and its near
The bending tapered waveguide of setting is coupled connection, and the big end for being bent tapered waveguide is connect with the input terminal of polarization beam apparatus, partially
Two output ends of vibration beam splitter are connect with output transverse electric mode monomode optical waveguide and output TM mode monomode optical waveguide respectively, are exported
Transverse electric mode monomode optical waveguide and output TM mode monomode optical waveguide are as remaining input/output end of multiplexing-demultiplexer；
Every multimode composited waveguide is by input multimode lightguide, the wide conical optical waveguide in evolution area and output multimode lightguide
Be sequentially connected composition, every bending tapered waveguide by preceding S-shaped bending optical waveguide structure, the narrow conical optical waveguide in evolution area and
S-shaped bending optical waveguide structure is connected in sequence afterwards, the wide conical optical waveguide in evolution area in every multimode composited waveguide with
The narrow conical optical waveguide in evolution area in its corresponding described bending tapered waveguide approaches and super model evolution, mineralizing evolution area occurs；
In the corresponding bending tapered waveguide of the wide conical optical waveguide in evolution area in every multimode composited waveguide
The narrow conical optical waveguide in evolution area is close so that super model evolution gradually occurs, and each evolution area can generate transverse electric mode and horizontal magnetic simultaneously
The super model of mould develops；
By the first gradually coupling evolution of the transverse electric mode and TM mode of the most high-order of the wide conical optical waveguide in evolution area at main limit
The super model in the narrow conical optical waveguide in evolution area is made, is then evolved into the cross being limited in rear S-shaped bending optical waveguide structure completely
Electric mould basic mode and TM mode basic mode.
2. a kind of multichannel dual-polarization mode multiplexing-demultiplexer according to claim 1, it is characterised in that: every place is drilled
The spacing changed between the narrow conical optical waveguide of the wide conical optical waveguide in evolution area and evolution area in area is identical, and the wide cone of light in the area that develops
Every place's spacing between the narrow conical optical waveguide of waveguide and evolution area is identical.
3. a kind of multichannel dual-polarization mode multiplexing-demultiplexer according to claim 1, it is characterised in that: each item is more
The width of the input multimode lightguide of die combination waveguide is sequentially reduced since one of connection input waveguide, and support
Dual-polarization eigen mode quantity is incremented by successively 2 since 2.
4. a kind of multichannel dual-polarization mode multiplexing-demultiplexer according to claim 1, it is characterised in that: every more
In die combination waveguide, the width for exporting multimode lightguide is less than the width of input multimode lightguide, the wide conical optical waveguide in evolution area
The width at both ends is respectively equal to export multimode lightguide and inputs the width of multimode lightguide.
5. a kind of multichannel dual-polarization mode multiplexing-demultiplexer according to claim 1, it is characterised in that: input is more
The high-order mode that mould optical waveguide is inputted is transverse electric mode or TM mode.
6. a kind of multichannel dual-polarization mode multiplexing-demultiplexer according to claim 1, it is characterised in that: described to drill
The taper for changing the wide conical optical waveguide in area is all satisfied adiabatic condition, i.e. optical signal does not excite new mode after conical optical waveguide.
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| CN109709643B (en) * | 2019-01-24 | 2020-07-14 | 浙江大学 | Dual-polarization mode multiplexing-demultiplexing chip based on monolithic integration |
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