Abstract
Based on the second-order nonlinearity, we present a bidirectional tunable
all-optical switch at C-band by introducing backward quasi-phase-matching technique
in Mg-doped periodically poled lithium niobate (MgO:PPLN) waveguide with a
nano-structure called multiple resonators. Two injecting forward lights and one
backward propagating light interact with difference frequency generations. The
transmission of forward signal and backward idler light can be modulated
simultaneously with the variation of control light power based on the basic "phase
shift" structure of a single resonator. In this scheme, all the results come from
our simulation. The speed of this bidirectional optical switch can reach to
femtosecond if a femtosecond laser is used as the control light.
© 2011 Chinese Optics Letters
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