Compact mode converters in thin-film lithium niobate integrated platforms

Jingjing Zhang; Pengfei Qiu; Runyu He; Xiaoxian Song; Zijie Dai; Yang Liu; Dong Pan; Junbo Yang; Kai Guo

doi:10.1364/OL.524739

Optics Letters
Vol. 49,
Issue 11,
pp. 2958-2961
(2024)
•https://doi.org/10.1364/OL.524739

Compact mode converters in thin-film lithium niobate integrated platforms

Jingjing Zhang, Pengfei Qiu, Runyu He, Xiaoxian Song, Zijie Dai, Yang Liu, Dong Pan, Junbo Yang, and Kai Guo

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Jingjing Zhang, Pengfei Qiu, Runyu He, Xiaoxian Song, Zijie Dai, Yang Liu, Dong Pan, Junbo Yang, and Kai Guo, "Compact mode converters in thin-film lithium niobate integrated platforms," Opt. Lett. 49, 2958-2961 (2024)

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Abstract

Mode converters, crucial elements within photonic integrated circuits (PICs) designed for multimode optical transmission and switching systems, present a challenge due to their bulky structures in thin-film lithium niobate (TFLN) integrated platforms, which are incompatible with the compact and efficient nature desired for dense PICs. In this work, we propose TE₁-TE₀, TE₂-TE₀, and TE₃-TE₀ mode converters in shallowly etched TFLN, within small footprints. The experimental results show that the insertion loss is 0.4 dB, 0.6 dB, and 0.5 dB for the compact TE₁-TE₀, TE₂-TE₀, and TE₃-TE₀ mode converters, respectively, and these devices can be operated within a wide 1 dB bandwidth (BW) over 100 nm. This work facilitates the development of low-loss, broadband, and compact monolithically integrated photonic devices for future multimode communication networks in TFLN integrated platforms.

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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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Conversion	Loss (dB)	BW (nm)	$L$ (µm)	Type	Ref.
TE $_{0}$ -TE $_{1}$	0.57	40	8	Loaded	[18]
TE $_{0}$ -TE $_{2}$	0.73	40	16	Loaded	[18]
TE $_{0}$ -TE $_{3}$	0.36	40	23	Loaded	[18]
TM $_{0}$ -TM $_{1}$	1.4	70	125	BIC	[27]
TM $_{0}$ -TM $_{2}$	1.35	70	157	BIC	[27]
TM $_{0}$ -TM $_{3}$	1.35	70	143	BIC	[27]
TE $_{0}$ -TE $_{1}$	0.4	100	550	Etched	[13]
TE $_{1}$ -TE $_{0}$	0.2	80	100	Etched	[24]
TE $_{2}$ -TE $_{0}$	0.2	80	100	Etched	[24]
TE $_{3}$ -TE $_{0}$	0.2	80	100	Etched	[24]
TE $_{1}$ -TE $_{0}$	0.4	130	10.3	Etched	TW
TE $_{2}$ -TE $_{0}$	0.6	130	9.2	Etched	TW
TE $_{3}$ -TE $_{0}$	0.5	130	$10.3 + 17.4$	Etched	TW

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