Numerical method for designing ultrashort and efficient adiabatic mode converters

Tulu Liang; Tulu Liang; Tulu Liang; Xi Cheng; Mei Yu; Mei Yu; Lingyan Zhang; Lingyan Zhang; Jin Shi; Jin Shi; Wei Shao

doi:10.1364/JOSAB.468543

Journal of the Optical Society of America B
Vol. 39,
Issue 10,
pp. 2637-2642
(2022)
•https://doi.org/10.1364/JOSAB.468543

Numerical method for designing ultrashort and efficient adiabatic mode converters

Tulu Liang, Xi Cheng, Mei Yu, Lingyan Zhang, Jin Shi, and Wei Shao

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Tulu Liang, Xi Cheng, Mei Yu, Lingyan Zhang, Jin Shi, and Wei Shao, "Numerical method for designing ultrashort and efficient adiabatic mode converters," J. Opt. Soc. Am. B 39, 2637-2642 (2022)

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Related Topics
Table of Contents Category
- Wave Guiding and Confinement
Optics & Photonics Topics
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About this Article
History
- Original Manuscript: June 23, 2022
- Revised Manuscript: August 19, 2022
- Manuscript Accepted: August 23, 2022
- Published: September 13, 2022

Abstract

This paper proposes a fully numerical method for designing adiabatic mode converters (NM-AMCs). The proposed method can help compute efficient adiabatic guided-wave shapes for mode converters using a nonuniform section division technique. Such a scheme reduces the memory requirement and computational time for the design of adiabatic devices. Furthermore, the adiabatic mode converter comprises a ridge waveguide, which is difficult to design using analytical methods. This complex case of an adiabatic mode converter is used to demonstrate how the proposed method can readily generate a guided-wave shape that gives the same mode-connection power transfer with a far shorter length compared with a linear-shape converter. The efficiency of the device designed using this NM-AMC is significantly better than that of linear-shape converters; this designed adiabatic mode converter can enable a broad operating bandwidth. Moreover, the efficiency of the adiabatic mode converter that was designed using the NM-AMC method considerably exceeds that obtained using an analytical method proposed for a strip waveguide.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$
1	1.18/1.24	6	1.38/1.39	11	1.416/1.424	16	1.452/1.458	21	1.50/1.52
2	1.24/1.30	7	1.39/1.398	12	1.424/1.432	17	1.458/1.464	22	1.52/1.54
3	1.30/1.34	8	1.398/1.405	13	1.432/1.440	18	1.464/1.472	23	1.54/1.58
4	1.34/1.36	9	1.405/1.411	14	1.440/1.446	19	1.472/1.48	24	1.58/1.64
5	1.36/1.38	10	1.411/1.416	15	1.446/1.452	20	1.48/1.50	25	1.64/1.70

$L_{1} / µ m$	$L_{2} / µ m$	$L_{3} / µ m$	$L_{4} / µ m$	$L_{5} / µ m$	$L_{6} / µ m$	$L_{7} / µ m$	$L_{8} / µ m$	$L_{9} / µ m$
7.90	29.90	49.73	56.00	84.772	75.18	76.66	80.76	78.00
$L_{10} / µ m$	$L_{11} / µ m$	$L_{12} / µ m$	$L_{13} / µ m$	$L_{14} / µ m$	$L_{15} / µ m$	$L_{16} / µ m$	$L_{17} / µ m$	$L_{18} / µ m$
67.12	116.40	119.80	117.80	87.60	78.08	65.60	49.76	67.50
$L_{19} / µ m$	$L_{20} / µ m$	$L_{21} / µ m$	$L_{22} / µ m$	$L_{23} / µ m$	$L_{24} / µ m$	$L_{25} / µ m$	Total length/µm
47.12	87.06	58.10	29.17	40.32	27.10	10.40	1607.83

Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$	Sect.	$W_{I} / W_{F} (µ m)$
1	1.18/1.24	6	1.38/1.39	11	1.416/1.424	16	1.452/1.458	21	1.50/1.52
2	1.24/1.30	7	1.39/1.398	12	1.424/1.432	17	1.458/1.464	22	1.52/1.54
3	1.30/1.34	8	1.398/1.405	13	1.432/1.440	18	1.464/1.472	23	1.54/1.58
4	1.34/1.36	9	1.405/1.411	14	1.440/1.446	19	1.472/1.48	24	1.58/1.64
5	1.36/1.38	10	1.411/1.416	15	1.446/1.452	20	1.48/1.50	25	1.64/1.70

$L_{1} / µ m$	$L_{2} / µ m$	$L_{3} / µ m$	$L_{4} / µ m$	$L_{5} / µ m$	$L_{6} / µ m$	$L_{7} / µ m$	$L_{8} / µ m$	$L_{9} / µ m$
7.90	29.90	49.73	56.00	84.772	75.18	76.66	80.76	78.00
$L_{10} / µ m$	$L_{11} / µ m$	$L_{12} / µ m$	$L_{13} / µ m$	$L_{14} / µ m$	$L_{15} / µ m$	$L_{16} / µ m$	$L_{17} / µ m$	$L_{18} / µ m$
67.12	116.40	119.80	117.80	87.60	78.08	65.60	49.76	67.50
$L_{19} / µ m$	$L_{20} / µ m$	$L_{21} / µ m$	$L_{22} / µ m$	$L_{23} / µ m$	$L_{24} / µ m$	$L_{25} / µ m$	Total length/µm
47.12	87.06	58.10	29.17	40.32	27.10	10.40	1607.83

Abstract

Data availability

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Figures (9)

Tables (2)

Equations (3)

Journal of the Optical Society of America B