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The development of all-optical wavelength converters is essential in WDM systems in order to perform optical routing and space switching, thus allowing a dynamic network reconfiguration.1 A promising approach for the development of such a device is based on the exploitation of the cascade of two second-order nonlinear processes in an optical waveguide. At present, periodically poled lithium niobate (PPLN) can be considered the most convenient second-order material due to the maturity of the associated technology. The waveguide fabrication procedure in PPLN can in fact be controlled with a good degree of reliability.
© 2002 Optical Society of America
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