Compact mode converter on SOI based on a polygonal subwavelength grating structure

Yong Zhao; Yong Zhao; Yong Zhao; Shengping Liu; Yuechun Shi; Yuechun Shi; Lijun Hao; Yuxin Ma; Pan Dai; Guilin Liu; Guilin Liu; Yi Ni; Xiangfei Chen

doi:10.1364/OL.516127

Optics Letters
Vol. 49,
Issue 4,
pp. 834-837
(2024)
•https://doi.org/10.1364/OL.516127

Compact mode converter on SOI based on a polygonal subwavelength grating structure

Yong Zhao, Shengping Liu, Yuechun Shi, Lijun Hao, Yuxin Ma, Pan Dai, Guilin Liu, Yi Ni, and Xiangfei Chen

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Yong Zhao, Shengping Liu, Yuechun Shi, Lijun Hao, Yuxin Ma, Pan Dai, Guilin Liu, Yi Ni, and Xiangfei Chen, "Compact mode converter on SOI based on a polygonal subwavelength grating structure," Opt. Lett. 49, 834-837 (2024)

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Abstract

In this Letter, we design and experimentally demonstrate compact mode converters with a lightning-like and arrow-like polygonal subwavelength grating (SWG) structure on a silicon-on-insulator (SOI) platform, which can convert the TE₀ mode to the TE₁ and TE₂ modes, respectively. The footprints of the proposed TE_0–1 and TE_0–2 mode converters are only 4.44 × 1.3 and 5.89 × 1.8 µm², respectively. The experimental results show the mode converters have a low insertion loss (<1 dB) and a broad bandwidth (>50 nm). The measured cross talks of the TE_0–1 and TE_0–2 mode converters are −7.2 dB and −10.3 dB, respectively. In addition, the proposed mode converters with the SWG structure have the advantage in fabrication, since only a one-step full-etching process is required.

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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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	TE_0–1 Mode Converter	TE_0–2 Mode Converter
Λ	200 nm	200 nm
a/Λ	0.5	0.6
α₁	10°	12.6°
α₂	8°	9.2°
d	1.1 µm	0.34 µm
w	1.3 µm	1.8 µm

(De)multiplexer	w_a₁	w_a₂	w_b₁	w_b₂
TE₁	0.3	0.1	0.5	0.76
TE₂	0.3	0.12	0.78	1.15
TE₃	0.3	0.12	1.15	1.4

Ref.	Length (µm)	IL (dB)	CT (dB)	Bandwidth (nm)	Type
[9]	23	0.78	NR	NR	TE_0–1
[15]	5.75	1	−10	21	TE_0–1
[15]	6.74	0.5	−10	20	TE_0–2
[7]	2.3	0.5	−7	50	TE_0–1
[7]	2.4	0.3	−9	50	TE_0–2
[13]	4	2.3	−11.5	40	TE_0–1 and TM_0–1
[14]	2.7	1.4	−15	60	TE_0–2 and TE_2–0
[11]	7.66	<0.5	−8	40	TE_0–2
This work	4.44	<1	−7.2	50	TE_0–1
This work	5.89	<1	−10.3	50	TE_0–2

	TE_0–1 Mode Converter	TE_0–2 Mode Converter
Λ	200 nm	200 nm
a/Λ	0.5	0.6
α₁	10°	12.6°
α₂	8°	9.2°
d	1.1 µm	0.34 µm
w	1.3 µm	1.8 µm

(De)multiplexer	w_a₁	w_a₂	w_b₁	w_b₂
TE₁	0.3	0.1	0.5	0.76
TE₂	0.3	0.12	0.78	1.15
TE₃	0.3	0.12	1.15	1.4

Abstract

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Equations (1)

Optics Letters