CN105676352A - Three-port mode interval separator - Google Patents

Three-port mode interval separator Download PDF

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Publication number
CN105676352A
CN105676352A CN201610025619.7A CN201610025619A CN105676352A CN 105676352 A CN105676352 A CN 105676352A CN 201610025619 A CN201610025619 A CN 201610025619A CN 105676352 A CN105676352 A CN 105676352A
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waveguide
branch
mode
described branch
branch waveguide
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CN105676352B (en
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陈伟伟
汪鹏君
杨甜军
张亚伟
周利强
杨建义
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Ningbo University
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Ningbo University
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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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

The invention discloses a three-port mode interval separator, including a main waveguide, a first branch waveguide, a second branch waveguide and a third branch waveguide. The tail end of the main waveguide is connected with a starting end of the first branch waveguide, a starting end of the second branch waveguide and a starting end of the third branch waveguide, the length of the first branch waveguide, the length of the second branch waveguide and the length of the third branch waveguide are equal, the width of the main waveguide is W0, the width of the first branch waveguide is W1, the width of the second branch waveguide is W2, the width of the third branch waveguide is W3, W3>W2>W1, W0=W1+W2+W3, and mode propagation constants of the first branch waveguide, the second branch waveguide and the third branch waveguide satisfy the following conditions: beta<3, k+1><beta<1, k><beta<2, k><beta<3, k>. The advantages are that fewer units can be utilized to be cascaded to increase ports, improve communication link capacity and flexibly control and process a light mode.

Description

A kind of three port modes are spaced apart device
Technical field
The present invention relates to a kind of mode spacing separator, especially relate to a kind of three port modes and be spaced apart device.
Background technology
Along with the swift and violent growth of quantity of information, people are more and more higher to processor processes information Capability Requirement, and existing processor mostly adopts parallel coenocytism. And how to promote between polycaryon processor and the problem that between core processor and the memorizer of outside, communication link capacity becomes key.
Silicon-based optical interconnection technology provides a kind of effective manner for solving this problem. Wavelength-division multiplex technique, polarization point multiplex technique and Multi-level modulation fomats are an up the traditional approach of link capacity. But, utilize these technology to move closer to theoretical boundary in order to expand link capacity. Therefore, it is necessary to Development of Novel transmission technology is to meet the bandwidth demand of explosive growth.
Mode multiplexing technology, Land use models is as new degree of freedom, and namely each pattern is as an independent data channel. Mode multiplexing/demultiplexer is one of essential elements in mode multiplexing communication link. Before this, existing substantial amounts of research work concentrates on and realizes the silica-based mode multiplexing/demultiplexer based on asymmetrical Y bifurcated, multimode interference and bonder. Similar with the wavelength interval separator in wavelength division multiplexing communications link, mode spacing separator is also the another one significant element that should consider in mode multiplexing communication link.
In view of this, design a kind of three port modes device that is spaced apart and be applied to mode multiplexing communication link, for utilize less unit cascaded with increase port and promote communication link capacity and for greater flexibility control to process optical mode significant.
Summary of the invention
The technical problem to be solved is to provide a kind of three port modes and is spaced apart device, this three port mode be spaced apart device may utilize less unit cascaded with increase port and promote communication link capacity and for greater flexibility control process optical mode.
This invention address that the technical scheme that above-mentioned technical problem adopts is: a kind of three port modes are spaced apart device, including trunk waveguide, the first branch-waveguide, the second branch-waveguide and the 3rd branch-waveguide; The tail end of described trunk waveguide connects with the top of the first described branch-waveguide, the top of the second described branch-waveguide and the top of the 3rd described branch-waveguide respectively, the length of the length of the first described branch-waveguide, the length of the second described branch-waveguide and the 3rd described branch-waveguide is equal, and the width of described trunk waveguide is designated as W0, the width of the first described branch-waveguide is designated as W1, the width of the second described branch-waveguide is designated as W2, the width of the 3rd described branch-waveguide is designated as W3, W3> W2> W1, W0=W1+W2+W3, the mode propagation constant of the first described branch-waveguide, the second described branch-waveguide and the 3rd described branch-waveguide meets the following conditions: β3,k+1< β1,k< β2,k< β3,k, wherein, β1,kFor the mode propagation constant of kth order mode, β in the first described branch-waveguide2,kFor the mode propagation constant of kth order mode, β in the second described branch-waveguide3,kFor the mode propagation constant of kth order mode, β in the 3rd described branch-waveguide3,k+1The mode propagation constant of kth+1 order mode in the 3rd described branch-waveguide, k takes natural number.
Spacing between tail end and the tail end of the 3rd described branch-waveguide of the first described branch-waveguide is Wg1, the spacing between tail end and the tail end of the 3rd described branch-waveguide of the second described branch-waveguide is Wg2, the length of described trunk waveguide is L0, the length of the first described branch-waveguide is L, W1=0.7 μm, W2=0.75 μm, W3=0.85 μm, L0=100 μm, L=770 μm, Wg1=1.7 μm, Wg2=1.5 μm.
Compared with prior art, it is an advantage of the current invention that constructing three port modes by trunk waveguide, the first branch-waveguide, the second branch-waveguide and the 3rd branch-waveguide is spaced apart device, the top of tail end respectively with the first branch-waveguide of trunk waveguide, the top of the second branch-waveguide and the top of the 3rd branch-waveguide connect, the length of the length of the first branch-waveguide, the length of the second branch-waveguide and the 3rd branch-waveguide is equal, and the width of trunk waveguide is designated as W0, the width of the first branch-waveguide is designated as W1, the width of the second branch-waveguide is designated as W2, the width of the 3rd branch-waveguide is designated as W3, W3> W2> W1, W0=W1+W2+W3, the mode propagation constant of the first branch-waveguide, the second branch-waveguide and the 3rd branch-waveguide meets the following conditions: β3,k+1< β1,k< β2,k< β3,k, wherein, β1,kFor the mode propagation constant of kth order mode, β in the first described branch-waveguide2,kFor the mode propagation constant of kth order mode, β in the second described branch-waveguide3,kFor the mode propagation constant of kth order mode, β in the 3rd described branch-waveguide3,k+1The mode propagation constant of kth+1 order mode in the 3rd described branch-waveguide, k takes natural number; When kth order mode inputs from the first branch-waveguide, the second branch-waveguide and the 3rd branch-waveguide respectively, when branch-waveguide is with trunk waveguide junction, can interlock and encourage (3k+2) order mode, (3k+1) order mode and (3k) order mode in trunk waveguide, vice versa, thus available less unit cascaded to increase port and to promote communication link capacity and control process optical mode for greater flexibility;
Spacing between the tail end and the tail end of the 3rd branch-waveguide of the first branch-waveguide is Wg1, the spacing between tail end and the tail end of the 3rd branch-waveguide of the second branch-waveguide is Wg2, the length of trunk waveguide is L0, the length of the first branch-waveguide is L, W1=0.7 μm, W2=0.75 μm, W3=0.85 μm, L0=100 μm, L=770 μm, Wg1=1.7 μm, Wg2When=1.5 μm, the crosstalk respectively-26.4dB ,-25.4dB of the basic mode in trunk waveguide, First-Order Mode, second order mode, three order modes, four order modes and five order modes at a wavelength of 1550 run,-24.8dB,-21.3dB ,-19.6dB and-20.1dB, the three port modes device performance that is spaced apart reaches optimum.
Accompanying drawing explanation
Fig. 1 is that three port modes of the present invention are spaced apart the structure chart of device;
Three port modes that Fig. 2 is the present invention are spaced apart device when operation wavelength is 1550nm, the transmission figure of the first six pattern;
Fig. 3 is that three port modes of the present invention are spaced apart device length scanning spectrogram.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one: the device as it is shown in figure 1, a kind of three port modes are spaced apart, including trunk waveguide the 1, first branch-waveguide the 2, second branch-waveguide 3 and the 3rd branch-waveguide 4; The top of tail end respectively with the first branch-waveguide 2 of trunk waveguide 1, the top of the second branch-waveguide 3 and the top of the 3rd branch-waveguide 4 connect, the length of the length of the first branch-waveguide 2, the length of the second branch-waveguide 3 and the 3rd branch-waveguide 4 is equal, and the width of trunk waveguide 1 is designated as W0, the width of the first branch-waveguide 2 is designated as W1, the width of the second branch-waveguide 3 is designated as W2, the width of the 3rd branch-waveguide 4 is designated as W3, W3> W2> W1, W0=W1+W2+W3, the mode propagation constant of first branch-waveguide the 2, second branch-waveguide 3 and the 3rd branch-waveguide 4 meets the following conditions: β3,k+1< β1,k< β2,k< β3,k, wherein, β1,kIt is the mode propagation constant of kth order mode, β in the first branch-waveguide 22,kIt is the mode propagation constant of kth order mode, β in the second branch-waveguide 33,kThe mode propagation constant of kth order mode, β in 3rd branch-waveguide 43,k+1Being the mode propagation constant of kth+1 order mode in the 3rd branch-waveguide 4, k takes natural number.
Embodiment two: the device as it is shown in figure 1, a kind of three port modes are spaced apart, including trunk waveguide the 1, first branch-waveguide the 2, second branch-waveguide 3 and the 3rd branch-waveguide 4; The top of tail end respectively with the first branch-waveguide 2 of trunk waveguide 1, the top of the second branch-waveguide 3 and the top of the 3rd branch-waveguide 4 connect, the length of the length of the first branch-waveguide 2, the length of the second branch-waveguide 3 and the 3rd branch-waveguide 4 is equal, and the width of trunk waveguide 1 is designated as W0, the width of the first branch-waveguide 2 is designated as W1, the width of the second branch-waveguide 3 is designated as W2, the width of the 3rd branch-waveguide 4 is designated as W3, W3> W2> W1, W0=W1+W2+W3, the mode propagation constant of first branch-waveguide the 2, second branch-waveguide 3 and the 3rd branch-waveguide 4 meets the following conditions: β3,k+1< β1,k< β2,k< β3,k, wherein, β1,kIt is the mode propagation constant of kth order mode, β in the first branch-waveguide 22,kIt is the mode propagation constant of kth order mode, β in the second branch-waveguide 33,kThe mode propagation constant of kth order mode, β in 3rd branch-waveguide 43,k+1It is the mode propagation constant of kth+1 order mode in the 3rd branch-waveguide 4, k=0,1,2.
In the present embodiment, the spacing between tail end and the tail end of the 3rd branch-waveguide 4 of the first branch-waveguide 2 is Wg1, the spacing between tail end and the tail end of the 3rd branch-waveguide 4 of the second branch-waveguide 3 is Wg2, the length of trunk waveguide 1 is L0, the length of the first branch-waveguide 2 is L, W1=0.7 μm, W2=0.75 μm, W3=0.85 μm, L0=100 μm, L=770 μm, Wg1=1.7 μm, Wg2=1.5 μm.
Three port modes of the present invention are spaced apart device when operation wavelength is 1550nm, and the transmission figure of the first six pattern is as shown in Figure 2. Analysis chart 2 (a)-2 (f) is known, when inputting just basic mode and three order modes, these patterns translate into basic mode and the First-Order Mode of the 3rd branch-waveguide 4, if inputting just First-Order Mode and four order modes, these patterns translate into basic mode and the First-Order Mode of the second branch-waveguide 3, if inputting just second order mode and five order modes, these patterns translate into basic mode and the First-Order Mode of the first branch-waveguide 2, the identical desired design result of device operating characteristic perfection it can thus be appreciated that three port modes of the present invention are spaced apart.
Three port modes of the present invention are spaced apart device length scanning spectrogram as shown in Figure 3. In Fig. 3, solid line, dotted line and dotted line represent that input light is transferred to the situation of first branch-waveguide the 2, second branch-waveguide 3 and the 3rd branch-waveguide 4 from trunk waveguide 1 respectively; The basic mode of the first branch-waveguide, the second branch-waveguide and the 3rd branch-waveguide and the Output optical power of First-Order Mode represent by rectangle and circle respectively. Can be seen that pattern crosstalk is less than-17dB when wave band is 1480nm to 1660nm from Fig. 3 (a)-3 (f).

Claims (2)

1. a port mode is spaced apart device, it is characterised in that include trunk waveguide, the first branch-waveguide, the second branch-waveguide and the 3rd branch-waveguide; The tail end of described trunk waveguide connects with the top of the first described branch-waveguide, the top of the second described branch-waveguide and the top of the 3rd described branch-waveguide respectively, the length of the length of the first described branch-waveguide, the length of the second described branch-waveguide and the 3rd described branch-waveguide is equal, and the width of described trunk waveguide is designated as W0, the width of the first described branch-waveguide is designated as W1, the width of the second described branch-waveguide is designated as W2, the width of the 3rd described branch-waveguide is designated as W3, W3> W2> W1, W0=W1+W2+W3, the mode propagation constant of the first described branch-waveguide, the second described branch-waveguide and the 3rd described branch-waveguide meets the following conditions: β3,k+1< β1,k< β2,k< β3,k, wherein, β1,kFor the mode propagation constant of kth order mode, β in the first described branch-waveguide2,kFor the mode propagation constant of kth order mode, β in the second described branch-waveguide3,kFor the mode propagation constant of kth order mode, β in the 3rd described branch-waveguide3,k+1The mode propagation constant of kth+1 order mode in the 3rd described branch-waveguide, k takes natural number.
2. a kind of three port modes according to claim 1 are spaced apart device, and the spacing between tail end and the tail end of the 3rd described branch-waveguide of the first described branch-waveguide is Wg1, the spacing between tail end and the tail end of the 3rd described branch-waveguide of the second described branch-waveguide is Wg2, the length of described trunk waveguide is L0, the length of the first described branch-waveguide is L, W1=0.7 μm, W2=0.75 μm, W3=0.85 μm, L0=100 μm, L=770 μm, Wg1=1.7 μm, Wg2=1.5 μm.
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CN107490829A (en) * 2017-08-17 2017-12-19 宁波大学 Three pattern multiplexers based on reverse tapering waveguide/demultiplexer

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Publication number Priority date Publication date Assignee Title
CN107490829A (en) * 2017-08-17 2017-12-19 宁波大学 Three pattern multiplexers based on reverse tapering waveguide/demultiplexer
CN107490829B (en) * 2017-08-17 2019-12-13 宁波大学 Three-mode multiplexer/demultiplexer based on reverse tapered waveguide

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