Abstract

We have investigated proposed all-optical switching by use of cascading of phase-matched sum-frequency-generation (SFG) and difference-frequency-generation (DFG) processes. The switching operation is accomplished by both a π phase change and an amplitude change of the signal field in SFG–DFG processes. We theoretically confirmed that the proposed switch requires the least operation power of any switch that uses cascading SFG–DFG processes. The switching characteristics have been numerically clarified, and the experimental full-switching characteristics when a bulk-type periodically poled ${\mathrm{LiNbO}}_3$ is used correspond to the numerical analysis. An ultrafast all-optical switch with low switching power and small size can be expected from use of waveguide-type devices.

© 1997 Optical Society of America

All-optical switching by use of cascading of phase-matched sum-frequency-generation and difference-frequency-generation processes in periodically poled LiNbO₃

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