Compact silicon-based on-chip wavelength triplexer using directional couplers with double bridged subwavelength gratings

Jingyuan Chen; Jinbiao Xiao

doi:10.1364/AO.439312

Applied Optics
Vol. 60,
Issue 30,
pp. 9587-9593
(2021)
•https://doi.org/10.1364/AO.439312

Compact silicon-based on-chip wavelength triplexer using directional couplers with double bridged subwavelength gratings

Jingyuan Chen and Jinbiao Xiao

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Jingyuan Chen and Jinbiao Xiao, "Compact silicon-based on-chip wavelength triplexer using directional couplers with double bridged subwavelength gratings," Appl. Opt. 60, 9587-9593 (2021)

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- Integrated Optics
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About this Article
History
- Original Manuscript: August 2, 2021
- Revised Manuscript: September 13, 2021
- Manuscript Accepted: September 26, 2021
- Published: October 19, 2021

Abstract

A compact silicon on-chip wavelength triplexer engineered by double bridged subwavelength gratings (BSWGs) is proposed based on cascaded symmetric directional couplers (SDCs). The SDC consists of a pair of symmetric and identical BSWGs with another SWG waveguide implemented in the middle of the SDC section. It functions well provided that the coupling lengths can match even or odd times of beat lengths of the three wavelengths. Relying on deliberately tailoring the structural dimensions of SWGs at different positions of SDC, the two lowest-mode refractive indices and beat lengths can be efficiently tuned, drastically reducing device footprint. The results show a total device length of 42.2 µm, which is ${\sim}{{10}}\%$ of its conventional counterpart based on SDCs. An insertion loss (IL) lower than 0.67 dB, reflection loss (RL) below ${-}{21.4}\;{\rm{dB}}$, and extinction ratio (ER) as high as 34.5 dB are also obtained in the results. The bandwidths around wavelength bands and fabrication tolerances to dimensional variations are investigated and analyzed. The field evolutions for the three injected wavelength bands are presented.

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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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References	Structure	Footprint	${E R}_{m a x} / {X T}_{m i n}$ (dB)	${I L}_{m i n}$ (dB)	${R L}_{m i n}$ (dB)
[4]	Diffraction grating	$500 µ m \times 1.5 m m$	$- 50$	1.5	/
[5]	Y-junction	$250 m m \times 20 m m$	25	1	/
[6]	MMI $+$ grating	$5.4 µ m \times 453 µ m$	27	0.39	/
[8]	MMI	0.6 cm long	37.15	0.34	/
[9]	Bent DC	$19 µ m \times 31 µ m$	$\sim - 15$	1	/
[10]	SDC	400 µm long	13	0.1	/
[11]	ADC	$\sim 150 µ m$ long	$- 27.07$	0.69	/
[12]	Bragg grating	$500 µ m \times 40 µ m$	$- 28$	0.3	/
[13]	AWG $+$ MMI	$1 m m \times 2 m m$	45	0.35	/
[14]	MZI $+$ MMI	$1 \times 3 . 5 m m^{2}$	10	/	/
[15]	SDC $+$ grating	$\sim 6.3 m m$ long	$\sim - 18$	0.07	$- 0.12$
[16]	MMI $+$ grating	$2.5 \times 911 µ m^{2}$	$- 20$	1	/
[17]	MRR $+$ grating	13.5 µm long	$- 38$	1	/
This work	SDC $+$ SWG	42.2 µm long	34.5	$\sim 0.67$	$- 21.4$

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