CN104090336A - Compact and efficient spot-size converter and design method thereof - Google Patents
Compact and efficient spot-size converter and design method thereof Download PDFInfo
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- CN104090336A CN104090336A CN201410374940.7A CN201410374940A CN104090336A CN 104090336 A CN104090336 A CN 104090336A CN 201410374940 A CN201410374940 A CN 201410374940A CN 104090336 A CN104090336 A CN 104090336A
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Abstract
The invention provides a compact and efficient spot-size converter and a design method thereof. The method comprises the following steps of firstly, dividing a linear tapered transformation structure with the length L into fewer segments arranged at equal intervals; then, optimizing the width of each segment by a progressive optimization method instead of a traditional genetic algorithm; and dividing the fewer segments into more segments on the basis that the fewer segments are optimized, and continuing to optimize until high conversion efficiency is obtained, and therefore, compared with the traditional genetic algorithm, the optimization method greatly improves the efficiency. After the compact and efficient spot-size converter is used, under that condition that the traditional linear tapered transformation structure has the same conversion efficiency, the length of an existing converter is greatly reduced to 20 microns from 150 microns, so that the integration level of a chip is further improved.
Description
Technical field
The present invention relates to silicon based opto-electronics integrated chip manufacturing technology field, refer more particularly to a kind of spot-size converter and method for designing thereof.
Background technology
Along with the develop rapidly of global optical communication technique, light signal processing integrated chip more and more obtains people's attention.A lot of micro-nano integrated devices, for example micro-ring wave filter, array waveguide grating and modulator etc. have all been realized on silicon-on-insulator (SOI).For the light signal in communication link is coupled in integrated chip effectively, people have proposed to utilize grating coupler to realize the coupling of light signal.
But regrettably, in order to mate with single-mode fiber, the width of grating waveguide needs very wide (generally in 12 μ m left and right), this will (width be generally 0.5 μ and m) produces mode mismatch with follow-up single mode waveguide.In order to reduce both mode mismatches, conventionally utilize linear taper mapped structure to carry out implementation pattern conversion, but realize higher conversion efficiency (more than 95%), the length of pyramidal structure needs length (more than generally needing 150 μ m) very, and this is very disadvantageous to the integrated of chip.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of spot-size converter and method for designing thereof of compact high efficient rate, and it overcomes the shortcoming that conventional linear taper mapped structure length is long.
For solving the problems of the technologies described above, the present invention proposes the method for designing of the spot-size converter of compact high efficient rate,
First the linear taper mapped structure of length L is first divided into the continuous waveguide of equally spaced n section, n is greater than 1 natural number, and the two ends width of establishing the waveguide of j section is respectively w
jand w
j+1, j value is from 1 to n; Wherein w
1for the width of input waveguide, w
n+1for changing the width of rear output waveguide; Then first optimize w
2value, obtain conversion efficiency w when the highest
2value, then at w
2basis on to w
3be optimized, obtain conversion efficiency w when the highest
3value, obtain by that analogy follow-up duct width, until obtain w
n, obtain thus respectively with w
1, w
2, w
3..., w
nand w
n+1for the n section continuous transformation waveguiding structure of duct width, be required spot-size converter.
The technical scheme of further optimizing is, to above-mentioned spot-size converter again from w
2start to carry out the optimization of a new round, until the raising of conversion efficiency while being less than setting threshold, thinks under this segments, be optimized to the best, obtain required spot-size converter.
Further optimisation technique scheme is, each section of said n section waveguide is remake respectively to m decile, and m is greater than 1 natural number; Then continue to optimize according to above-mentioned optimization method.Until when the raising of (N1>N2) efficiency is less than setting threshold while being divided into N1 section and N2 section, thinks and obtained optimum spot-size converter.
The technical scheme being more preferably is that described each sectional waveguide is on same axial line.
Can obtain a kind of spot-size converter of compact high efficient rate by said method, it comprises some sections of continuous waveguides, and the two ends width of j section waveguide is respectively w
jand w
j+1, w
j+1at w
jbasis on optimize and obtain, and described each sectional waveguide is isosceles trapezoid.
The spot-size converter that the present invention obtains, under very little waveguide length condition, realizes efficient mould spot conversion, is suitable for the application of silicon-on-insulator (SOI).Meanwhile, optimization method of the present invention, utilizes and first divides few section progressively to optimize, and then further divide the method that multistage is optimized, and the relatively traditional genetic algorithm of optimization efficiency improves greatly.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is further described in detail.
Figure 1 shows that the spot-size converter structural principle schematic diagram of the compact high efficient rate that the present invention proposes.
Figure 2 shows that traditional linear taper mapped structure.
Fig. 3 (a) is depicted as the optical field distribution of the linear taper mapped structure of the spot-size converter equal length of the compact high efficient rate proposing with the present invention.
Fig. 3 (b) is depicted as the optical field distribution of the spot-size converter of the compact high efficient rate of the present invention's proposition.
Figure 4 shows that the transition loss spectral line (dotted line) of the linear taper mapped structure of transition loss spectral line (solid line) when the present invention specifically implements and equal length.
Embodiment
The spot-size converter structural representation of compact high efficient rate of the present invention as shown in Figure 1.
Key of the present invention is to utilize the linear taper mapped structure by being L by a length to be first equally spaced divided into less hop count, then use progressively optimization instead of traditional genetic algorithm to optimize the width of each section, then on the optimization basis of less segmentation, being further divided into more hop count continues to optimize, until obtain very high conversion efficiency, the genetic algorithm that the efficiency of this optimization method is relatively traditional will improve greatly.Concrete grammar is:
The linear taper mapped structure of length L is divided into equally spaced n section, gets n=10, L is the target length of required spot-size converter, gets L=20 μ m, and the width of the continuous waveguide of n section is respectively w
1, w
2, w
3..., w
nand w
n+1, wherein w
1for the width of input waveguide, w
n+1for changing the width of rear output waveguide, get w
1=12 μ m, w
n+1=0.5 μ m.Then first to w
2be optimized, obtain conversion efficiency w when the highest
2value, then by that analogy optimize, obtain follow-up w
3, w
4width, until be optimized to w
n, obtain thus respectively with w
1, w
2, w
3..., w
nand w
n+1for the n section continuous transformation waveguiding structure of duct width, be required spot-size converter.
On the basis of above-mentioned spot-size converter waveguiding structure, again from w
2the raising of conversion efficiency starts to carry out the optimization of a new round, until while being less than 1%, can being thought and be optimized to desirable spot-size converter structure.
More further scheme is, on the basis of above-mentioned desirable spot-size converter structure, further structure to be divided into more hop count and to be optimized.That is, each section of above-mentioned 10 sections is divided equally to 2 parts, i.e. n=20, then continues to continue to optimize according to optimization method before.Until the raising of (N1>N2) efficiency is less than 1% while being divided into N1 section and N2 section, thinks and obtained optimum structure.In the present embodiment, for the spot-size converter of L=20 μ m, optimize from n=10, obtained optimum structure during to n=40, conversion efficiency is 95%.The field strength distribution of equal length (20 microns) linear taper mapped structure is as shown in Fig. 3 (a), the field strength distribution of the spot-size converter of the compact high efficient rate after subsection optimization is as shown in Fig. 3 (b), visible by after the method for subsection optimization, scattering of light loss has obviously reduced.
Figure 4 shows that the transition loss spectral line (dotted line) of the linear taper mapped structure of transition loss spectral line (solid line) when the present invention specifically implements and equal length, visible by after the method for subsection optimization, the transition loss of mould spot has reduced 4.8dB.
Comparison diagram 2, the present invention is traditional linear taper mapped structure, under equal conversion efficiency, the length of converter can be reduced to L=20 μ m in Fig. 1 by the L '=150 μ m from Fig. 2 greatly, the further integrated level that improves chip.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. a method for designing for the spot-size converter of compact high efficient rate, is characterized in that, comprises the following steps:
First the linear taper mapped structure of length L is first divided into the continuous waveguide of equally spaced n section, n is greater than 1 natural number, and the two ends width of establishing the waveguide of j section is respectively w
jand w
j+1, j value is from 1 to n; Wherein w
1for the width of input waveguide, w
n+1for changing the width of rear output waveguide;
First to w
2be optimized, obtain conversion efficiency w when the highest
2value,
Then at w
2basis on to w
3be optimized, obtain conversion efficiency w when the highest
3value, obtain by that analogy follow-up optimized width value, until obtain w
n, obtain thus respectively with w
1, w
2, w
3..., w
nand w
n+1for the n section continuous transformation waveguiding structure of width, be required spot-size converter.
2. the method for designing of the spot-size converter of compact high efficient rate according to claim 1, is characterized in that, to above-mentioned spot-size converter again from w
2start to carry out the optimization of a new round, until the raising of conversion efficiency while being less than setting threshold, obtains required spot-size converter.
3. the method for designing of the spot-size converter of compact high efficient rate according to claim 2, is characterized in that, each section of said n section waveguide is further made respectively to m decile, and m is greater than 1 natural number; Then continue to optimize according to above-mentioned optimization method; Until while being divided into N1 section and N2 section, N1>N2, when the raising of conversion efficiency is less than setting threshold, obtains required optimum spot-size converter.
4. according to the method for designing of the spot-size converter of the described compact high efficient rate of one of claims 1 to 3, it is characterized in that, described each sectional waveguide is on same axial line.
5. a spot-size converter for the compact high efficient rate that described in claim 4 prepared by the method for designing of the spot-size converter of compact high efficient rate, is characterized in that, it comprises some sections of continuous waveguides, and the two ends width of j section waveguide is respectively w
jand w
j+1, w
j+1at w
jbasis on optimize and obtain, and described each sectional waveguide is isosceles trapezoid.
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| CN201410374940.7A CN104090336B (en) | 2014-07-30 | 2014-07-30 | The spot-size converter and its method for designing of compact high efficient rate |
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| CN104090336B CN104090336B (en) | 2017-07-11 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491013A (en) * | 2018-12-29 | 2019-03-19 | 华进半导体封装先导技术研发中心有限公司 | A kind of spot-size converter structure and parameter optimization method |
| WO2020135860A1 (en) * | 2018-12-29 | 2020-07-02 | 中兴光电子技术有限公司 | Method for optimizing waveguide and cruciform waveguide crosser |
| 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 |
| CN112987289A (en) * | 2021-02-05 | 2021-06-18 | 中国科学院微电子研究所 | Parameter optimization method of waveguide structure |
| CN113376742A (en) * | 2021-06-18 | 2021-09-10 | 哈尔滨理工大学 | Parameter selection method of simple high-conversion-rate conical mode converter |
| 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 |
| CN114859464A (en) * | 2021-01-20 | 2022-08-05 | 中国科学院微电子研究所 | Fundamental mode-mode field converter and construction method thereof |
| CN116643354A (en) * | 2023-07-27 | 2023-08-25 | 之江实验室 | Design method of spot-size converter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491013A (en) * | 2018-12-29 | 2019-03-19 | 华进半导体封装先导技术研发中心有限公司 | A kind of spot-size converter structure and parameter optimization method |
| WO2020135860A1 (en) * | 2018-12-29 | 2020-07-02 | 中兴光电子技术有限公司 | Method for optimizing waveguide and cruciform waveguide crosser |
| 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 |
| CN114859464A (en) * | 2021-01-20 | 2022-08-05 | 中国科学院微电子研究所 | Fundamental mode-mode field converter and construction method thereof |
| 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 |
| CN112987289A (en) * | 2021-02-05 | 2021-06-18 | 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 |
| CN113376742A (en) * | 2021-06-18 | 2021-09-10 | 哈尔滨理工大学 | Parameter selection method of simple high-conversion-rate conical mode converter |
| CN116643354A (en) * | 2023-07-27 | 2023-08-25 | 之江实验室 | Design method of spot-size converter |
| CN116643354B (en) * | 2023-07-27 | 2023-12-19 | 之江实验室 | Design method of spot-size converter |
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