Compact and broadband on-chip silicon polarization beam splitter based on tilted subwavelength grating

Haoyang Sun; Yin Xu; Yue Dong; Bo Zhang; Yi Ni; Yi Ni

doi:10.1364/JOSAB.472349

Journal of the Optical Society of America B
Vol. 39,
Issue 11,
pp. 3049-3058
(2022)
•https://doi.org/10.1364/JOSAB.472349

Compact and broadband on-chip silicon polarization beam splitter based on tilted subwavelength grating

Haoyang Sun, Yin Xu, Yue Dong, Bo Zhang, and Yi Ni

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Haoyang Sun, Yin Xu, Yue Dong, Bo Zhang, and Yi Ni, "Compact and broadband on-chip silicon polarization beam splitter based on tilted subwavelength grating," J. Opt. Soc. Am. B 39, 3049-3058 (2022)

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Table of Contents Category
- Wave Guiding and Confinement
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About this Article
History
- Original Manuscript: August 3, 2022
- Revised Manuscript: September 21, 2022
- Manuscript Accepted: October 4, 2022
- Published: October 28, 2022

Abstract

Efficient polarization management is a key issue for on-chip silicon photonic integrated circuits. Here, we propose a compact and broadband on-chip silicon polarization beam splitter (PBS) using tilted subwavelength grating (SWG) structure. The key polarization separation region consists of an input tapered SWG, a titled SWG, and two output tapered SWGs at both output ports. The tilted SWG has a strong polarization dependence for the mode coupling, and we have introduced different grating duty cycles, positional offset, and a new, to the best of our knowledge, output mode transition structure to enhance the device performance. Based on these techniques, the key coupling length of the proposed PBS is only 5 µm (total length, 12 µm), together with polarization extinction ratio (ER) 21.2 dB (19.7 dB) and insertion loss 0.21 dB (0.39 dB) for the TE (TM) mode. Moreover, the device working bandwidth can be extended to 311 nm (154 nm) by keeping ${\rm ER} \gt {15}\;{\rm dB}$ (${\rm ER} \gt {18}\;{\rm dB}$), satisfying the on-chip broadband applications. We believe the proposed device could become a good candidate to boost the on-chip polarization management toward compact and broadband directions.

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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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Parameter	$L_{1}$	$L_{2}$	$L_{3}$	$L_{4}$	$L_{5}$	$L_{6}$	$a_{1}$	$a_{2}$	$a_{3}$	$Λ$	$h$
Value	4 µm	1.8 µm	3.2 µm	5 µm	2 µm	2.8 µm	90 nm	80 nm	120 nm	200 nm	340 nm
Parameter	$W_{1}$	$W_{T E 1}$	$W_{T E 2}$	$W_{I n 1}$	$W_{I n 2}$	$W_{T M 1}$	$W_{T M 2}$	$W_{G a p 1}$	$W_{G a p 2}$	$W_{O u t}$	$ρ$
Value	500 nm	350 nm	550 nm	600 nm	120 nm	160 nm	640 nm	80 nm	100 nm	80 nm	0.45

Reference	Structure	Length (µm)	ER (dB)	IL (dB)	Bandwidth (nm)
[6]	ADC (S)	3.7	14/13^#	0.025/0.66^#	$\sim 120 (E R > 12 d B)$
[11]	MMI (E)	102.1	22.3/25.6	0.7/0.1	$60 (E R > 16 d B)$
[13]	MZI (S)	$> 100$	$> 22 / > 20$	$< 0.2 / < 0.5$	$310 (E R > 20 d B)$
[16]	PC (E)	71.5	$> 20$ ^##	$< 2$	$77 (E R > 20 d B)$
[21]	SWG (S)	6.8	32.2/20.9	0.08/0.36	$\sim 81 (E R > 18 d B$ )
[22]	H-SWG (E)	12.25	$> 20$	$< 1$	$> 200 (E R > 20 d B)$
[23]	SWG and Slot (S)	4.6	16.3/10.9	0.5/0.8	$420 (E R > 10.9 d B)$
[24]	SWG-MMI (S)	92.4	$> 20$	$< 1$	$131 (E R > 20 d B)$
[25]	SWG-ADC (E)	6.8	19.84	0.2	$80 (E R > 10 d B)$
This work	Tilted SWG (S)	5(12)^###	21.2/19.7	0.21/0.39	$311 (E R > 15 d B)$ $154 (E R > 18$ dB)

Parameter	$L_{1}$	$L_{2}$	$L_{3}$	$L_{4}$	$L_{5}$	$L_{6}$	$a_{1}$	$a_{2}$	$a_{3}$	$Λ$	$h$
Value	4 µm	1.8 µm	3.2 µm	5 µm	2 µm	2.8 µm	90 nm	80 nm	120 nm	200 nm	340 nm
Parameter	$W_{1}$	$W_{T E 1}$	$W_{T E 2}$	$W_{I n 1}$	$W_{I n 2}$	$W_{T M 1}$	$W_{T M 2}$	$W_{G a p 1}$	$W_{G a p 2}$	$W_{O u t}$	$ρ$
Value	500 nm	350 nm	550 nm	600 nm	120 nm	160 nm	640 nm	80 nm	100 nm	80 nm	0.45

Reference	Structure	Length (µm)	ER (dB)	IL (dB)	Bandwidth (nm)
[6]	ADC (S)	3.7	14/13^#	0.025/0.66^#	$\sim 120 (E R > 12 d B)$
[11]	MMI (E)	102.1	22.3/25.6	0.7/0.1	$60 (E R > 16 d B)$
[13]	MZI (S)	$> 100$	$> 22 / > 20$	$< 0.2 / < 0.5$	$310 (E R > 20 d B)$
[16]	PC (E)	71.5	$> 20$ ^##	$< 2$	$77 (E R > 20 d B)$
[21]	SWG (S)	6.8	32.2/20.9	0.08/0.36	$\sim 81 (E R > 18 d B$ )
[22]	H-SWG (E)	12.25	$> 20$	$< 1$	$> 200 (E R > 20 d B)$
[23]	SWG and Slot (S)	4.6	16.3/10.9	0.5/0.8	$420 (E R > 10.9 d B)$
[24]	SWG-MMI (S)	92.4	$> 20$	$< 1$	$131 (E R > 20 d B)$
[25]	SWG-ADC (E)	6.8	19.84	0.2	$80 (E R > 10 d B)$
This work	Tilted SWG (S)	5(12)^###	21.2/19.7	0.21/0.39	$311 (E R > 15 d B)$ $154 (E R > 18$ dB)

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Journal of the Optical Society of America B