In this Letter, we propose and demonstrate an integrated polarizer on thin film lithium niobate (TFLN). The polarizer consists of a width-tapered 180° Euler bending waveguide featuring thin thickness and bilevel mode convertors with silica cladding. Notably, the TE₀ mode is efficiently confined in the waveguide, while the TM₀ mode confronts significant bending losses. The measurements reveal that the excess loss remains below 1.5 dB, and the extinction ratio surpasses 19 dB within a working bandwidth spanning from 1480 to 1578 nm. The proposed polarizer holds considerable promise for enhancing polarization handling within TFLN photonic circuits.

中文翻译：

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具有宽度锥形欧拉弯曲的薄膜铌酸锂高性能偏光片

在这封信中，我们提出并演示了一种基于薄膜铌酸锂（TFLN）的集成偏振器。该偏振器由厚度较薄的宽度锥形 180° 欧拉弯曲波导和带二氧化硅包层的双层模式转换器组成。值得注意的是，TE ₀模式被有效地限制在波导中，而 TM ₀模式面临着显着的弯曲损耗。测量结果表明，在1480至1578 nm的工作带宽内，额外损耗保持在1.5 dB以下，消光比超过19 dB。所提出的偏振器对于增强 TFLN 光子电路内的偏振处理具有很大的前景。