Opt Express. 2023 Jun 5;31(12):19604-19612. doi: 10.1364/OE.487843.
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 and TM to be output as TE 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 and TM are less than 1.5 dB and 1 dB, respectively.
本文展示了一种基于薄膜铌酸锂（TFLN）的偏振旋转器-分束器（PRS）。该 PRS 由部分腐蚀的偏振旋转锥和绝热耦合器组成，可将输入的 TE 和 TM 分别输出为两个端口的 TE。采用标准 i 线光刻技术制作的 PRS 在整个 C 波段实现了>20dB 的大偏振消光比（PER）。当宽度变化±150nm 时，仍能保持良好的偏振特性。TE 和 TM 的片上插入损耗分别小于 1.5dB 和 1dB。
