Abstract
A counterpropagating quasi-phase-matched configuration is examined that
is capable of efficiently producing second-order cascaded nonlinear phase
shifts with minimal power lost to the second harmonic. For all-optical switching
in a nonlinear Mach–Zehnder interferometer,
the calculated minimum input power needed for switching (i.e., to yield a phase shift) is 40 times smaller than the power needed in the standard
type I copropagating configuration. The throughput of this
counterpropagating device is 96% at the optimum switching point.
© 1997 Optical Society of America
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