Abstract

We experimentally demonstrate a demodulation scheme for $20\mathrm{Gbaud}/\mathrm{s}$ nonreturn-to-zero differential quadrature phase-shift keying signals using a silicon microring resonator. Either the $I$ or $Q$ channel can be selected by electrical tuning using the carrier depletion effect. Error-free (bit error rate $<{10}^{-9}$) operations can be achieved for both the $I$ and $Q$ channels with $\sim 1.5\mathrm{dB}$ power penalty compared with a commercial 20 GHz Mach–Zehnder delay interferometer. The tuning range of the ring resonator can be up to 60 GHz, which enables operation over a wide range of data rates.

© 2012 Optical Society of America

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