An all-passive dual polarization optical 90o-hybrid in silicon-on-insulator waveguides is proposed and designed. It consists of two 2×2 MMI-MZI structures, working as polarization beam splitters, and two 4 × 4 MMI couplers, working as 90o-hybrids. The fabrication process includes only one step of inductively coupled plasma (ICP) etching. It is particularly suitable for silicon-based integration of DP-QPSK receiver.

© 2010 Optical Society of America

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