Abstract
We analyze and propose a directional optical coupler embedded in
photonic crystal, which is driven by an external command signal.
Therefore, this switching cell can work in an all-optical switch. The
switching method uses a low-power external command signal, inserted in
the central coupling region, which acts as another waveguide. The
switching process is based on the change from the bar state to the cross
state due to the external command signal. In our simulations we used the
plane wave expansion method, finite-difference time-domain method, and
our own binary propagation method. (C) 2009 Optical Society of America
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