High-dimensional communication on etchless lithium niobate platform with photonic bound states in the continuum

Zejie Yu, Yeyu Tong, Hon Ki Tsang and Xiankai Sun ()
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Zejie Yu: The Chinese University of Hong Kong
Yeyu Tong: The Chinese University of Hong Kong
Hon Ki Tsang: The Chinese University of Hong Kong
Xiankai Sun: The Chinese University of Hong Kong

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Photonic bound states in the continuum (BICs) have been exploited in various systems and found numerous applications. Here, we investigate high-order BICs and apply BICs on an integrated photonic platform to high-dimensional optical communication. A four-channel TM mode (de)multiplexer using different orders of BICs on an etchless lithium niobate (LiNbO3) platform where waveguides are constructed by a low-refractive-index material on a high-refractive-index substrate is demonstrated. Low propagation loss of the TM modes in different orders and phase-matching conditions for efficient excitation of the high-order TM modes are simultaneously achieved. A chip consisting of four-channel mode (de)multiplexers was fabricated and measured with data transmission at 40 Gbps/channel. All the channels have insertion loss

Date: 2020
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DOI: 10.1038/s41467-020-15358-x

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