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.

中文翻译：

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铌酸锂-富硅氮化物混合平台上的C波段四通道CWDM（解）复用器

已经设计、制造并实验测量了在薄膜铌酸锂-富硅氮化物混合平台上的四通道粗波分复用 (CWDM) (解)复用器。由级联多模波导布拉格光栅启用，（解）复用器具有盒状光谱响应、宽 1-dB 带宽 (10 nm)、低过量损耗 ( $\lt{1.08}\;{\rm dB}$ ) , 和低通道串扰 ( $\lt- {18}\;{\rm dB}$ )。（解）复用器的中心波长为 1531/1551/1571/1591 nm，符合 ITU-T G.694.2 标准规定的波长网格。