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On-chip four-mode (de-)multiplexer on thin film lithium niobate–silicon rich nitride hybrid platform

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Abstract

A four-mode (de-)multiplexer with transverse electric field light (${{\rm TE}_0} - {{\rm TE}_3}$) is experimentally demonstrated on a thin film lithium niobate–silicon rich nitride hybrid platform. Enabled by cascaded asymmetrical directional couplers, a (de-)multiplexer with low insertion loss (0.38 dB to 1.6 dB) and low cross talk (${-}{18.46}\;{\rm dB}$ to ${-}{20.43}\;{\rm dB}$) is obtained at 1550 nm. All channels have cross talk ${\lt}-{16}\;{\rm dB}$ from 1480 nm to 1580 nm. The transmission of $4 \times 50$ Gbps on–off keying signals is experimentally achieved on the proposed (de-)multiplexer. Experimental results show that the proposed (de-)multiplexer is a promising approach to enhance the transmission capacity in thin film lithium niobate based photonics integrated circuits.

© 2021 Optical Society of America

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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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