Abstract

We demonstrate a polarization rotator based on adiabatic mode evolution on silicon for polarization-diversified circuits. The rotator has a device length of 420μm, a polarization-conversion efficiency of more than 90%, and an insertion loss less than 1dB for a wavelength range of 80nm. Combining the rotator with a compact, broadband polarization beam splitter based on cascaded directional couplers enhances the polarization conversion extinction ratio to over 30dB with less than 1.5dB total insertion loss over a 60nm spectral range.

© 2011 Optical Society of America

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