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C-band four-channel CWDM (de-)multiplexers on a thin film lithium niobate–silicon rich nitride hybrid platform

Yang Liu, Xingrui Huang, Huan Guan, Zhiguo Yu, Qingquan Wei, Zhongchao Fan, Weihua Han, and Zhiyong Li

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Abstract

A four-channel coarse wavelength division multiplexing (CWDM) (de)multiplexer on a thin film lithium niobate–silicon rich nitride hybrid platform has been designed, fabricated, and experimentally measured. Enabled by cascaded multimode waveguide Bragg gratings, the (de)multiplexer has a box-like spectral response, wide 1-dB bandwidth (10 nm), low excess loss ($\lt{1.08}\;{\rm dB}$), and low channel cross talk ($\lt- {18}\;{\rm dB}$). The central wavelengths of the (de-)multiplexer are 1531/1551/1571/1591 nm, which align to the wavelength grids stipulated by the standard ITU-T G.694.2.

© 2021 Optical Society of America

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Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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