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Ultra-compact and fabrication-tolerant polarization rotator based on a bend asymmetric-slab waveguide

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Abstract

We propose and analyze a polarization rotator based on a bend asymmetric-slab waveguide on the silicon-on-insulator platform. The device can be fabricated using standard complementary metal–oxide–semiconductor process involving only two dry etching steps. Compared with the formerly reported polarization rotators based on two-step etching, our introduced device demonstrates a significant improvement for fabrication tolerance. Furthermore, an ultra compact structure of 5μm conversion length, an insertion loss of only 0.5 dB, and an extinction ratio of >40dB for both TE to TM polarization conversion and TM to TE polarization conversion are exhibited. Operation wavelength and the influence of environmental temperature on our device are also discussed.

© 2013 Optical Society of America

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