Fully adiabatic polarization rotator-splitter based on thin-film lithium niobate platform
Liyuan Song, Jieru Zhao, Xiangyang Dai, Mingzhi Lu, Qiaoyin Lu, Weihua Guo
Abstract
A Polarization Rotator-Splitter (PRS) based on thin-film lithium niobate (TFLN) is demonstrated in this work. The PRS consists of a partially etched polarization rotating taper and an adiabatic coupler, which enables the input TE 0 and TM 0 to be output as TE 0 from two ports, respectively. The fabricated PRS using standard i-line photolithography achieved large polarization extinction ratios (PERs) of > 20 dB across the whole C-band. Excellent polarization characteristics are maintained when the width is changed by ±150 nm. The on-chip insertion losses of TE 0 and TM 0 are less than 1.5 dB and 1 dB, respectively.
Topics & Concepts
Lithium niobateMaterials sciencePhotolithographyOpticsPolarization (electrochemistry)Adiabatic processExtinction ratioOptoelectronicsBeam splitterBirefringenceWavelengthPhysicsChemistryPhysical chemistryLaserThermodynamicsPhotorefractive and Nonlinear OpticsPhotonic and Optical DevicesAdvanced Fiber Laser Technologies