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A Polarization Rotator-Splitter (PRS) using thin-film lithium niobate (TFLN) is designed to convert input TE (transverse electric) and TM (transverse magnetic) modes into TE output from two different ports.
The PRS was fabricated using standard i-line photolithography and achieved impressive polarization extinction ratios (PERs) greater than 20 dB across the entire C-band.
The device maintains strong polarization performance when the width varies by ±150 nm, with low insertion losses of less than 1.5 dB for TE and 1 dB for TM modes.
Article 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 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.
