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All-optical wavelength converters can increase the flexibility of wavelength division multiplexed (WDM) networks by allowing such techniques as wavelength routing.1 This paper describes wavelength conversion using an ultrafast optical switch based on a multiple quantum well (MQW) saturable absorber (SA) integrated within a Fabry-Perot (FP) cavity.2 The device is designed to be anti-resonant and impedance matched, such that, ideally, its reflectivity is zero under small signal conditions at the operating wavelength. A small change in the absorption of the SA breaks the impedance matching condition, resulting in substantially increased reflectivity.
© 2002 Optical Society of America
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