We propose and experimentally demonstrate a high-performance polarization splitter-rotator based on the lithium niobate-on-insulator platform, consisting of an adiabatic taper, an asymmetric directional coupler, and a multimode interference mode splitter. Two injecting modes with orthogonal polarization states were separated, and the transverse magnetic (TM) polarization state was rotated to the transverse electric (TE) polarization state simultaneously. The designed device is fabricated in a single-step etching process, providing an extinction ratio of 20 dB over 80 nm wavelength range and insertion loss of less than 0.65 dB for both TE ₀ and TM ₀ modes launched. Lithium niobate-on-insulator, polarization splitter-rotator, extinction ratio.

中文翻译：

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基于铌酸锂绝缘体平台的高性能偏振分路器-旋转器

我们提出并实验证明了一种基于绝缘体上铌酸锂平台的高性能偏振分离器-旋转器，由绝热锥体、非对称定向耦合器和多模干涉模式分离器组成。分离两种正交偏振态的注入模式，同时将横向磁（TM）偏振态旋转到横向电（TE）偏振态。设计的器件采用单步蚀刻工艺制造，在 80 nm 波长范围内提供 20 dB 的消光比，并且对于发射的TE ₀和 TM ₀模式的插入损耗均小于 0.65 dB 。绝缘体上的铌酸锂，偏振分离器-旋转器，消光比。