Abstract
Light modulators and switches based on silicon photonic microrings can be
fabricated with the conventional CMOS technology. For the first time, an
optical interconnect integrated on a VLSI electronic die can be
realistically envisioned. In spite of this exciting development, there is
still one fundamental problem that must be overcome: wavelength
nonuniformity, which is a result of miniaturization of the ring and the
precision limit of the current fabricating process. Existing electronic or
thermo-optical tuning methods are simply not scalable. An approach that
combines techniques from both the device and architecture point of view is
presented in this paper. It intends to show how the device-level wavelength
nonuniformity problem can be tackled at the architecture level. An
analytical model is also developed for evaluating the probability of finding
a common wavelength among multiple microring resonators. The model can
provide useful insights into the design of any microring-based
interconnection network.
© 2011 IEEE
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