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A Broadband Algorithm for Adiabatic Mode Evolution and An Application on Polarization Splitter-Rotator on LNOI Platform

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posted on 2024-07-10, 16:00 authored by Geng Chen, Chijun Li, Xuanhao Wang, Yuankang Huang, Siyu Lu, Yiqi Dai, Xiangyu Meng, Cheng Zeng, Jinsong Xia
Adiabatic mode evolution waveguides (AMEWs) are widely utilized in integrated photonics, including tapered waveguides, edge couplers, mode converters, splitters, etc. An analytical theory and a novel AMEW design algorithm are developed to create shortcuts to adiabaticity (STA). With the new algorithm, we demonstrate a broadband and highly efficient polarization splitter-rotator (PSR) on a lithium-niobate-on-insulator (LNOI) platform with an LN thickness of 500 nm. The fabricated PSR, with a total length of 2 mm, exhibits an insertion loss (IL) of 0.8 dB and a polarization extinction ratio (ER) of 12 dB over a wavelength range exceeding 76 nm.

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