Broadband silicon grating couplers with high efficiency and a robust design

Daniil S. Zemtsov; Denis M. Zhigunov; Sergey S. Kosolobov; Anastasia K. Zemtsova; Marius Puplauskis; Ivan A. Pshenichnyuk; Vladimir P. Drachev

doi:10.1364/OL.457284

Optics Letters
Vol. 47,
Issue 13,
pp. 3339-3342
(2022)
•https://doi.org/10.1364/OL.457284

Broadband silicon grating couplers with high efficiency and a robust design

Daniil S. Zemtsov, Denis M. Zhigunov, Sergey S. Kosolobov, Anastasia K. Zemtsova, Marius Puplauskis, Ivan A. Pshenichnyuk, and Vladimir P. Drachev

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Daniil S. Zemtsov, Denis M. Zhigunov, Sergey S. Kosolobov, Anastasia K. Zemtsova, Marius Puplauskis, Ivan A. Pshenichnyuk, and Vladimir P. Drachev, "Broadband silicon grating couplers with high efficiency and a robust design," Opt. Lett. 47, 3339-3342 (2022)

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Abstract

A record-high efficiency and bandwidth for a fiber-to-chip grating coupler have been achieved with a robust design and cost-effective fabrication on a silicon-on-insulator platform. The design optimization involves the usual geometrical parameters, period, and fill factor, and a mode matching for the fiber output and grating. The measured coupling efficiency for TE polarization and 1 dB bandwidth are −2.64 dB (54 %) per grating and 67 nm, respectively. The 3 dB bandwidth exceeds 100 nm, fully covering the C + L band. The results fill the gap between theory and experimental realization in the existing literature.

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Supplementary Material (1)

Name	Description
Supplement 1	Method and results of the tolerance measurements

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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Reference	Type	BOX, $μ$ m	CE, dB	BW, nm	Year
[11]	UGC	1	$- 5.2$	$40^{1 d B}$	2006
[12]	UGC slanted	2	$- 3.3$	$80^{3 d B}$	2007
[13]	UGC	2	$- 4.7$	$45^{3 d B}$	2008
[14]	SWGC	2	$- 4.7$	$40^{3 d B}$	2009
[15]	SWGC	2	$- 5.2$	$23^{1 d B}$	2010
[16]	AGC	2	$- 2.7$	$41^{1 d B}$	2013
[3]	Bimodal UGC	2	$- 3$ .1	–	2018
[17]	SWGC	3	$- 3.1$	$55^{3 d B}$	2020
This work	UGC	2	$- 2.6$	$67^{1 d B}$ ; > $100^{3 d B}$	2022

Abstract

Supplementary Material (1)

Data availability

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Optics Letters