Broadband dual-mode 3 dB power splitter using bricked subwavelength gratings

Mengjia Lu; Chunyu Deng; Yu Sun; Dongyu Wang; Pengcheng Liu; Dongdong Lin; Wei Cheng; Shangqing Shi; Tong Lin; Guohua Hu; Binfeng Yun; Yiping Cui

doi:10.1364/JOSAB.482899

Journal of the Optical Society of America B
Vol. 40,
Issue 3,
pp. 502-508
(2023)
•https://doi.org/10.1364/JOSAB.482899

Broadband dual-mode 3 dB power splitter using bricked subwavelength gratings

Mengjia Lu, Chunyu Deng, Yu Sun, Dongyu Wang, Pengcheng Liu, Dongdong Lin, Wei Cheng, Shangqing Shi, Tong Lin, Guohua Hu, Binfeng Yun, and Yiping Cui

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Mengjia Lu, Chunyu Deng, Yu Sun, Dongyu Wang, Pengcheng Liu, Dongdong Lin, Wei Cheng, Shangqing Shi, Tong Lin, Guohua Hu, Binfeng Yun, and Yiping Cui, "Broadband dual-mode 3 dB power splitter using bricked subwavelength gratings," J. Opt. Soc. Am. B 40, 502-508 (2023)

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- Photonics
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About this Article
History
- Original Manuscript: December 5, 2022
- Revised Manuscript: January 11, 2023
- Manuscript Accepted: January 11, 2023
- Published: February 9, 2023

Abstract

The multimode power splitter plays an essential role in on-chip mode-division multiplexing systems. In this work, a broadband dual-mode optical power splitter based on the self-imaging effect in the multimode interference (MMI) engineered by bricked subwavelength gratings (BSWGs) is proposed. The dual-mode power splitter is optimized by combining the 3D finite difference time domain (FDTD) and the particle swarm optimization (PSO) method. For the input ${{\rm TE}_0}$ mode, the insertion loss (IL) and the imbalance (IB) are lower than 0.55 dB and 0.65 dB, while the IL and IB for the input ${{\rm TE}_1}$ mode are, respectively, lower than 0.7 dB and 0.37 dB over 150 nm bandwidth in the wavelength range of 1.5–1.65 µm. In addition, the cross talk (CT) is lower than ${-}{25}\;{\rm dB}$ for the two modes over this wavelength range. Furthermore, the minimum feature size of the gratings is as large as 135 nm, and only a single etch step is required, which is beneficial for the fabrication.

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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	$w_{t} (µ m)$	$L_{t 1} (µ m)$	$L_{t 2} (µ m)$	$L_{c} (µ m)$	$\bar{Δ z}$
Value	0.136	8.1	7.02	39.42	0.26

		IL(dB)		CT(dB)		BW(nm)
Structure	Device Footprint ( $µ m^{2}$ )	S	E	S	E	S	E	MFS(nm)
Tapered DC [11]	$15.2 \times 2.28$	0.1	0.7	−17	−14.3	60	30	200
Subwavelength structure [14]	$2.88 \times 2.88$	0.9	1.5	−20	−20	60	60	90
Shallowly etched MMI [16]	$145 \times 6$	0.5	/	−22	/	50	/	/
MMI [17]	$86.5 \times 5$	0.39	0.76	−22.9	−20.5	100	60	/
SWG-MMI [26]	$48 \times 5$	0.4	0.65	−32	−17	100	100	110
This work	$54.54 \times 5$	0.7	/	−25	/	150	/	135

Parameter	$w_{t} (µ m)$	$L_{t 1} (µ m)$	$L_{t 2} (µ m)$	$L_{c} (µ m)$	$\bar{Δ z}$
Value	0.136	8.1	7.02	39.42	0.26

		IL(dB)		CT(dB)		BW(nm)
Structure	Device Footprint ( $µ m^{2}$ )	S	E	S	E	S	E	MFS(nm)
Tapered DC [11]	$15.2 \times 2.28$	0.1	0.7	−17	−14.3	60	30	200
Subwavelength structure [14]	$2.88 \times 2.88$	0.9	1.5	−20	−20	60	60	90
Shallowly etched MMI [16]	$145 \times 6$	0.5	/	−22	/	50	/	/
MMI [17]	$86.5 \times 5$	0.39	0.76	−22.9	−20.5	100	60	/
SWG-MMI [26]	$48 \times 5$	0.4	0.65	−32	−17	100	100	110
This work	$54.54 \times 5$	0.7	/	−25	/	150	/	135

Abstract

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Equations (11)

Journal of the Optical Society of America B