Compact and robust 2 × 2 fast quasi-adiabatic 3-dB couplers on SOI strip waveguides

Yung J. Hung; Chih Hsien Chen; Guan Xun Lu; Fu Chieh Liang; Hung Ching Chung; Shuo Yen Tseng

doi:10.1016/j.optlastec.2021.107485

Compact and robust 2 × 2 fast quasi-adiabatic 3-dB couplers on SOI strip waveguides

Yung J. Hung, Chih Hsien Chen, Guan Xun Lu, Fu Chieh Liang, Hung Ching Chung, Shuo Yen Tseng

Department of Photonics

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We design and experimentally demonstrate compact and robust fast quasi-adiabatic (FAQUAD) couplers for silicon-on-insulator (SOI) strip waveguides. The mode evolution region of the coupler is optimized by the FAQUAD protocol, achieving shortcuts to adiabatic mode evolution in a short length of 11.7 μm. 3-dB couplers with measured bandwidths (3 dB ± 1 dB) larger than 75 nm over temperature range from 20 °C to 50 °C are designed and fabricated using standard CMOS-compatible optical lithography, with the smallest device footprint of 53.7 × 4 μm². Devices with longer mode evolution regions are also evaluated by simulations and experiments. 3-dB couplers with a footprint of 87.6 × 4 μm² show larger than 85 nm bandwidths (3 dB ± 0.5 dB) over the same 30 °C range.

Original language	English
Article number	107485
Journal	Optics and Laser Technology
Volume	145
DOIs	https://doi.org/10.1016/j.optlastec.2021.107485
Publication status	Published - 2022 Jan

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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10.1016/j.optlastec.2021.107485

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title = "Compact and robust 2 × 2 fast quasi-adiabatic 3-dB couplers on SOI strip waveguides",

abstract = "We design and experimentally demonstrate compact and robust fast quasi-adiabatic (FAQUAD) couplers for silicon-on-insulator (SOI) strip waveguides. The mode evolution region of the coupler is optimized by the FAQUAD protocol, achieving shortcuts to adiabatic mode evolution in a short length of 11.7 μm. 3-dB couplers with measured bandwidths (3 dB ± 1 dB) larger than 75 nm over temperature range from 20 °C to 50 °C are designed and fabricated using standard CMOS-compatible optical lithography, with the smallest device footprint of 53.7 × 4 μm2. Devices with longer mode evolution regions are also evaluated by simulations and experiments. 3-dB couplers with a footprint of 87.6 × 4 μm2 show larger than 85 nm bandwidths (3 dB ± 0.5 dB) over the same 30 °C range.",

author = "Hung, {Yung J.} and Chen, {Chih Hsien} and Lu, {Guan Xun} and Liang, {Fu Chieh} and Chung, {Hung Ching} and Tseng, {Shuo Yen}",

note = "Funding Information: The authors would like to acknowledge chip fabrication support provided by Taiwan Semiconductor Research Institute (TSRI). This work was supported in part by the Ministry of Science and Technology, Taiwan under grant 108-2221-E-006-204-MY3, 109-2221-E-110-068-MY3, and 110-2224-E-992-001. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2022",

month = jan,

doi = "10.1016/j.optlastec.2021.107485",

language = "English",

volume = "145",

journal = "Optics and Laser Technology",

issn = "0030-3992",

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T1 - Compact and robust 2 × 2 fast quasi-adiabatic 3-dB couplers on SOI strip waveguides

AU - Hung, Yung J.

AU - Chen, Chih Hsien

AU - Lu, Guan Xun

AU - Liang, Fu Chieh

AU - Chung, Hung Ching

AU - Tseng, Shuo Yen

N1 - Funding Information: The authors would like to acknowledge chip fabrication support provided by Taiwan Semiconductor Research Institute (TSRI). This work was supported in part by the Ministry of Science and Technology, Taiwan under grant 108-2221-E-006-204-MY3, 109-2221-E-110-068-MY3, and 110-2224-E-992-001. Publisher Copyright: © 2021 Elsevier Ltd

PY - 2022/1

Y1 - 2022/1

N2 - We design and experimentally demonstrate compact and robust fast quasi-adiabatic (FAQUAD) couplers for silicon-on-insulator (SOI) strip waveguides. The mode evolution region of the coupler is optimized by the FAQUAD protocol, achieving shortcuts to adiabatic mode evolution in a short length of 11.7 μm. 3-dB couplers with measured bandwidths (3 dB ± 1 dB) larger than 75 nm over temperature range from 20 °C to 50 °C are designed and fabricated using standard CMOS-compatible optical lithography, with the smallest device footprint of 53.7 × 4 μm2. Devices with longer mode evolution regions are also evaluated by simulations and experiments. 3-dB couplers with a footprint of 87.6 × 4 μm2 show larger than 85 nm bandwidths (3 dB ± 0.5 dB) over the same 30 °C range.

AB - We design and experimentally demonstrate compact and robust fast quasi-adiabatic (FAQUAD) couplers for silicon-on-insulator (SOI) strip waveguides. The mode evolution region of the coupler is optimized by the FAQUAD protocol, achieving shortcuts to adiabatic mode evolution in a short length of 11.7 μm. 3-dB couplers with measured bandwidths (3 dB ± 1 dB) larger than 75 nm over temperature range from 20 °C to 50 °C are designed and fabricated using standard CMOS-compatible optical lithography, with the smallest device footprint of 53.7 × 4 μm2. Devices with longer mode evolution regions are also evaluated by simulations and experiments. 3-dB couplers with a footprint of 87.6 × 4 μm2 show larger than 85 nm bandwidths (3 dB ± 0.5 dB) over the same 30 °C range.

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Compact and robust 2 × 2 fast quasi-adiabatic 3-dB couplers on SOI strip waveguides

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