Abstract

We propose an optical 90° hybrid where no waveguide intersection in coupling to balanced photodiodes is required for coherent detection. The proposed device consisting of a paired-interference 2×4 multimode interference (MMI) coupler, a phase shifter, and a 2×2 MMI coupler exhibited quadrature phase response over a 94-nm-wide spectral range.

© 2009 Optical Society of America

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