Broadband Polarization Splitter-Rotator using Sub-wavelength Grating Assisted Adiabatic Waveguides

We demonstrate a broadband polarization splitter-rotator (PSR) based on sub-wavelength grating (SWG) assisted adiabatic waveguides. The SWG-based adiabatic PSR is more compact than previously reported adiabatic PSRs. Less than -19 dB polarization crosstalk was measured over a broad wavelength range from 1545 to 1615 nm.