A silicon-waveguide polarization converter with a metal strip on an SiO2 substrate

Abstract

A polarization converter consisting of a silicon waveguide is analyzed by the imaginary-distance beam propagation method based on Yee's mesh and the finite-difference time-domain method. It is revealed at a wavelength of 1.55 μm that the polarization conversion length is 15.1 iμm with an insertion loss of 0.47 dB. An extinction ratio of more than 20 dB is obtained over a wavelength range of 1.53 to 1.57μm.