High performance polarizer on thin-film lithium niobate with width-tapered Euler bending
Weixi Liu, Chengfeng Wen, Chenkun Lei, Lijia Song, Daoxin Dai, Yaocheng Shi
Abstract
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 TE 0 mode is efficiently confined in the waveguide, while the TM 0 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.
Topics & Concepts
Lithium niobatePolarizerOpticsMaterials scienceBendingThin filmOptoelectronicsComposite materialPhysicsBirefringenceNanotechnologyPhotorefractive and Nonlinear OpticsPhotonic and Optical DevicesFerroelectric and Piezoelectric Materials