Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings

Xuefeng Chen; Xiaodong Shi; Pengfei Qiu; Zijie Dai; Yu Yu; Xiaoxian Song; Haiting Zhang; Mingyang Chen; Yunxia Ye; Xudong Ren; Jingjing Zhang

doi:10.1364/OL.466344

Optics Letters
Vol. 47,
Issue 18,
pp. 4600-4603
(2022)
•https://doi.org/10.1364/OL.466344

Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings

Xuefeng Chen, Xiaodong Shi, Pengfei Qiu, Zijie Dai, Yu Yu, Xiaoxian Song, Haiting Zhang, Mingyang Chen, Yunxia Ye, Xudong Ren, and Jingjing Zhang

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Xuefeng Chen, Xiaodong Shi, Pengfei Qiu, Zijie Dai, Yu Yu, Xiaoxian Song, Haiting Zhang, Mingyang Chen, Yunxia Ye, Xudong Ren, and Jingjing Zhang, "Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings," Opt. Lett. 47, 4600-4603 (2022)

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Abstract

Mode-division multiplexing (MDM) is a promising solution to improve data transmission capacity for future optical interconnect networks. Mode converters and mode filters play a key role in on-chip MDM systems. Here, we propose and experimentally demonstrate a device, enabling mode conversion and filtering simultaneously, which is composed of asymmetrical directional couplers with subwavelength gratings, in a small footprint of 14.7 µm × 1.42 µm. The device can realize optical mode conversion between the first-order transverse electric (TE) mode and the fundamental TE mode, and can also filter the fundamental TE mode efficiently. The conversion efficiency is over 95%, with a broad 1 dB bandwidth over 80 nm and a high mode extinction ratio of >29 dB. As a mode filter, strong mode elimination of >30 dB is achieved.

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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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$H_{1}$ = 900 nm	$H_{2}$ = 410 nm	$L_{c}$ = 14.7 $μ$ m	$l_{x}$ = 200 nm
$w_{y}$ = 100 nm	$Λ_{x}$ = 420 nm	$g$ = 100 nm	$N$ = 35

Structure	FP ( $μ$ m $^{2}$ )	BW (nm)	MER (dB)	MCE (dB)	Function
Ref. [11]	$1.4 \times 12.3$	20	/	$- 0.46$	MC
Ref. [14]	$4.5 \times 120$	70	/	$- 0.79$	MC
Ref. [24]	$0.8 \times 1.2$	50	/	$- 1.2$	MC
Ref. [25]	$3.8 \times 136$	60	/	$- 1.8$	MC
Ref. [26]	$2 \times 9$	45	/	$- 2$	MC
Ref. [20]	$1.4 \times 12$	35	21	/	MF
Ref. [21]	$0.5 \times 15$	100	50	/	MF
Ref. [27]	$1.1 \times 5.5$	140	20	/	MF
Ref. [28]	$3 \times 150$	35	15	/	MF
Ref. [29]	$6 \times 11,100$	35	39	/	MF
Our design	$1.42 \times 14.7$	80	29	$- 0.22$	MF/MC

$H_{1}$ = 900 nm	$H_{2}$ = 410 nm	$L_{c}$ = 14.7 $μ$ m	$l_{x}$ = 200 nm
$w_{y}$ = 100 nm	$Λ_{x}$ = 420 nm	$g$ = 100 nm	$N$ = 35

Structure	FP ( $μ$ m $^{2}$ )	BW (nm)	MER (dB)	MCE (dB)	Function
Ref. [11]	$1.4 \times 12.3$	20	/	$- 0.46$	MC
Ref. [14]	$4.5 \times 120$	70	/	$- 0.79$	MC
Ref. [24]	$0.8 \times 1.2$	50	/	$- 1.2$	MC
Ref. [25]	$3.8 \times 136$	60	/	$- 1.8$	MC
Ref. [26]	$2 \times 9$	45	/	$- 2$	MC
Ref. [20]	$1.4 \times 12$	35	21	/	MF
Ref. [21]	$0.5 \times 15$	100	50	/	MF
Ref. [27]	$1.1 \times 5.5$	140	20	/	MF
Ref. [28]	$3 \times 150$	35	15	/	MF
Ref. [29]	$6 \times 11,100$	35	39	/	MF
Our design	$1.42 \times 14.7$	80	29	$- 0.22$	MF/MC

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Optics Letters