CN104090336B - The spot-size converter and its method for designing of compact high efficient rate - Google Patents
The spot-size converter and its method for designing of compact high efficient rate Download PDFInfo
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- CN104090336B CN104090336B CN201410374940.7A CN201410374940A CN104090336B CN 104090336 B CN104090336 B CN 104090336B CN 201410374940 A CN201410374940 A CN 201410374940A CN 104090336 B CN104090336 B CN 104090336B
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Abstract
The spot-size converter and its method for designing of a kind of compact high efficient rate of the present invention.By the way that one length is first divided into less equally spaced hop count for L linear taper mapped structure, then each section of width is optimized using successive optimization rather than traditional genetic algorithm, then more hop counts are further separated on the basis of the optimization of less segmentation to continue to optimize, until obtaining very high conversion efficiency, the genetic algorithm that the efficiency of this optimization method is relatively conventional will be greatly improved.The present invention is by traditional linear taper mapped structure, under equal conversion efficiency, and 150 μm of the length of existing converter can be greatly reduced to 20 μm, the further integrated level for improving chip.
Description
Technical field
The present invention relates to silicon based opto-electronicses integrated chip manufacturing technology field, more particularly to a kind of spot-size converter and its set
Meter method.
Background technology
With developing rapidly for global optical communication technique, optical signal prosessing integrated chip increasingly obtains the attention of people.
Many micro-nano integrated devices, all such as micro-loop wave filter, array waveguide grating and modulator etc., silicon on insulator
(SOI) realized on.In order to which the optical signal in communication link is efficiently coupled into integrated chip, there has been proposed utilize light
Grid coupler realizes the coupling of optical signal.
But regrettably, in order to be matched with single-mode fiber, the width needs of grating waveguide are very wide (typically at 12 μm
Left and right), this will produce mode mismatch with follow-up single mode waveguide (width is generally 0.5 μm).In order to reduce both patterns
Mismatch, generally using linear taper mapped structure come implementation pattern conversion, but to realize higher conversion efficiency (95% with
On), the length of pyramidal structure needs very long (generally requiring more than 150 μm), and this is very unfavorable to the integrated of chip.
The content of the invention
The technical problems to be solved by the invention are to provide spot-size converter and its design side of a kind of compact high efficient rate
Method, it overcomes the shortcoming of conventional linear taper mapped structure length length.
In order to solve the above technical problems, the present invention proposes the method for designing of the spot-size converter of compact high efficient rate,
Length L linear taper mapped structure is first first divided into equally spaced n sections continuous waveguide, n is the nature more than 1
Number, if the two ends width of jth section waveguide is respectively wjAnd wj+1, j values are from 1 to n；Wherein w1For the width of input waveguide, wn+1For
The width of output waveguide after conversion；Then w is first optimized2Value, obtain w during conversion efficiency highest2Value, then in w2Basis
On to w3Optimize, obtain w during conversion efficiency highest3Value, follow-up duct width is obtained by that analogy, until obtaining wn,
Thus obtain respectively with w1、w2、w3、…、wnAnd wn+1For the n section continuous transformation waveguiding structures of duct width, mould spot needed for being
Converter.
The technical scheme further optimized is, to above-mentioned spot-size converter again from w2The optimization of a new round is proceeded by,
When the raising of conversion efficiency is less than given threshold, it is believed that under the segments, be optimized to most preferably, obtain required mode-expansion
Device.
Further optimisation technique scheme is to remake m deciles respectively to each section of above-mentioned n sections of waveguide, m is more than 1
Natural number；Then continue to optimize according to above-mentioned optimization method.(N1 when being divided into N1 sections and N2 sections>N2) raising of efficiency is small
When given threshold, it is believed that obtained optimal spot-size converter.
More preferred technical scheme is that each sectional waveguide is on same axial line.
A kind of spot-size converter of compact high efficient rate can obtain by the above method, it includes some sections of continuous waveguides,
The two ends width of jth section waveguide is respectively wjAnd wj+1, wj+1It is in wjOn the basis of optimization obtain, and each sectional waveguide
For isosceles trapezoid.
The spot-size converter that the present invention is obtained, under the conditions of the waveguide length of very little, realizes efficient mould spot conversion, is suitable to
The application of silicon-on-insulator (SOI).Meanwhile, optimization method of the invention, using few section of successive optimization is first divided, then further
Divide the method for multistage optimization, the relatively conventional genetic algorithm of optimization efficiency is greatly improved.
Brief description of the drawings
Technical scheme is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 show the spot-size converter principle schematic diagram of compact high efficient rate proposed by the present invention.
Fig. 2 show traditional linear taper mapped structure.
Fig. 3 (a) show the linear taper with the spot-size converter equal length of compact high efficient rate proposed by the present invention
The optical field distribution of mapped structure.
Fig. 3 (b) show the optical field distribution of the spot-size converter of compact high efficient rate proposed by the present invention.
The linear taper of transition loss spectral line (solid line) and equal length when Fig. 4 show present invention specific implementation becomes
Change the transition loss spectral line (dotted line) of structure.
Embodiment
The spot-size converter structural representation of compact high efficient rate of the invention as shown in Figure 1.
The key of the present invention is to utilize by the way that a length is first equally spaced divided into for L linear taper mapped structure
Less hop count, then optimizes each section of width, then less using successive optimization rather than traditional genetic algorithm
It is further separated into more hop counts on the basis of the optimization of segmentation to continue to optimize, until obtaining very high conversion efficiency, this optimization
The genetic algorithm that the efficiency of method is relatively conventional will be greatly improved.Specific method is：
Length L linear taper mapped structure is divided into equally spaced n sections, n=10, spot-size converters of the L for needed for is taken
Target length, take L=20 μm, the width of n sections of continuous waveguides is respectively w1、w2、w3、…、wnAnd wn+1, wherein w1For incoming wave
The width led, wn+1For the width of output waveguide after conversion, w is taken1=12 μm, wn+1=0.5 μm.Then first to w2Optimize, obtain
To w during conversion efficiency highest2Value, then optimize by that analogy, obtain follow-up w3、w4Width, until being optimized to wn, thus
Obtain respectively with w1、w2、w3、…、wnAnd wn+1For the n section continuous transformation waveguiding structures of duct width, mode-expansion needed for being
Device.
On the basis of above-mentioned spot-size converter waveguiding structure, again from w2Proceed by the optimization of a new round, Zhi Daozhuan
When the raising for changing efficiency is less than 1%, it is believed that be optimized to preferable spot-size converter structure.
More further scheme is, on the basis of above-mentioned preferable spot-size converter structure, further by structure point
Optimized into more hop counts.That is, divide equally 2 parts, i.e. n=20 by each section of above-mentioned 10 sections, then proceed to according to before
Optimization method continues to optimize.(N1 when being divided into N1 sections and N2 sections>N2) raising of efficiency is less than 1%, it is believed that obtained optimal
Structure.In the present embodiment, for L=20 μm of spot-size converter, from n=10 optimizations, optimal knot has been obtained during to n=40
Structure, conversion efficiency is 95%.Shown in field strength distribution such as Fig. 3 (a) of equal length (20 microns) linear taper mapped structure, segmentation
Shown in field strength distribution such as Fig. 3 (b) of the spot-size converter of compact high efficient rate after optimization, it is seen that pass through the method for subsection optimization
Afterwards, the scattering loss of light is significantly reduced.
The linear taper of transition loss spectral line (solid line) and equal length when Fig. 4 show present invention specific implementation becomes
Change the transition loss spectral line (dotted line) of structure, it is seen that after the method for subsection optimization, mould spot transition loss reduces 4.8dB.
Comparison diagram 2, the present invention, can be by converter under equal conversion efficiency by traditional linear taper mapped structure
Length be greatly reduced in Fig. 1 L=20 μm from L '=150 μm in Fig. 2, the further integrated level for improving chip.
It should be noted last that, above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to preferred embodiment, it will be understood by those within the art that, can be right
Technical scheme is modified or equivalent, and without departing from the spirit and scope of technical solution of the present invention, its is equal
It should cover among scope of the presently claimed invention.
Claims (2)
1. a kind of method for designing of the spot-size converter of compact high efficient rate, it is characterised in that comprise the following steps：
Length L linear taper mapped structure is first first divided into equally spaced n sections continuous waveguide, n is the natural number more than 1, if
The two ends width of jth section waveguide is respectively wjAnd wj+1, j values are from 1 to n；Wherein w1For the width of input waveguide, wn+1For conversion
The width of output waveguide afterwards；
First to w2Optimize, obtain w during conversion efficiency highest2Value,
Then in w2On the basis of to w3Optimize, obtain w during conversion efficiency highest3Value, obtain follow-up excellent by that analogy
Change width value, until obtaining wn, thus obtain respectively with w1、w2、w3、…、wnAnd wn+1For the n section continuous transformation waveguide junctions of width
Structure, spot-size converter needed for being；
To above-mentioned spot-size converter again from w2The optimization of a new round is proceeded by, until the raising of conversion efficiency is less than setting threshold
During value, that is, obtain required spot-size converter；
Further make m deciles respectively to each section of described n sections continuous waveguide, m is the natural number more than 1；Then according to above-mentioned
Optimization method continues to optimize；When being divided into N1 sections and N2 sections, N1>N2, when the raising of conversion efficiency is less than given threshold, is produced
To required optimal spot-size converter.
2. the method for designing of the spot-size converter of compact high efficient rate according to claim 1, it is characterised in that described each point
Section waveguide is on same axial line.
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| CN111381318B (en) * | 2018-12-29 | 2021-05-11 | 中兴光电子技术有限公司 | Method for optimizing waveguide and cross waveguide cross device |
| CN109491013B (en) * | 2018-12-29 | 2020-08-25 | 华进半导体封装先导技术研发中心有限公司 | Spot-on-spot converter structure and parameter optimization method |
| CN114730047A (en) * | 2019-12-02 | 2022-07-08 | 华为技术有限公司 | Spot-on-film converter, method for manufacturing spot-on-film converter, silicon optical device and optical communication equipment |
| CN114859464B (en) * | 2021-01-20 | 2024-04-16 | 中国科学院微电子研究所 | Fundamental mode field converter and construction method thereof |
| CN112987289B (en) * | 2021-02-05 | 2022-09-20 | 中国科学院微电子研究所 | Parameter optimization method of waveguide structure |
| CN112630887A (en) * | 2021-03-15 | 2021-04-09 | 苏州海光芯创光电科技股份有限公司 | Method for manufacturing optical waveguide mode converter and mode converter |
| CN113376742B (en) * | 2021-06-18 | 2022-09-13 | 哈尔滨理工大学 | Parameter selection method of simple high-conversion-rate conical mode converter |
| CN116643354B (en) * | 2023-07-27 | 2023-12-19 | 之江实验室 | Design method of spot-size converter |
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| US5629999A (en) * | 1995-03-10 | 1997-05-13 | Lucent Technologies Inc. | Side-gap mode tapering for integrated optic waveguides |
| CN1271765C (en) * | 2004-04-02 | 2006-08-23 | 华中科技大学 | Ridge waveguide polarized don't-care semiconductor optical enlarger of integrated modular spot converter |
| KR100737348B1 (en) * | 2004-12-14 | 2007-07-09 | 한국전자통신연구원 | Electroabsorption modulator and method for manufacturing the same |
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| Bert Luyssaert,Peter Bienstman,Peter Vandersteegen,Pieter Dumon.Efficient Nonadiabatic Planar Waveguide Tapers.《JOURNAL OF LIGHTWAVE TECHNOLOGY》.2005,第23卷(第8期), * |
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