Abstract
In this paper, we implement on a silicon-on-insulator (SoI) platform a
photonic-crystal demultiplexer that operates on the principle of
mini-stopbands of broader waveguides. Previous InP-based membrane versions
showed modest crosstalk at 10 nm spacing. Here, we implement a second cavity
in the form of a second parallel waveguide almost identical to the core one.
Simulations employing three-modes coupled-mode theory and finite-difference
time-domain help optimizing the coupling. The experimental realization with
deep ultraviolet exposure and grating couplers is the first of this demux
strategy on SoI. It successfully shows crosstalk in the 15–20 dB
range on a very small footprint.
© 2010 IEEE
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