Polarization Beam Splitter and Rotator for Polarization-Independent Silicon Photonic Circuit

Abstract

We propose a novel polarization beam splitter (PBS) and rotator (PBR) for polarization diversity configuration to implement a polarization-independent silicon photonic circuit. Our PBS, which is based on a directional coupler (DC), exhibits the polarization extinction ratio (PER) of 10 dB for the C-band, and the maximum PER is 23 dB. For the PBR, which consists of a Si wire and an off-axis silicon oxinitride (SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</sub> ) waveguide, the simulated PER exceeds 20 dB in the efficient wavelength range of over 6 THz.