Abstract
Collinear acoustooptic (AO) devices have unique wavelength-selective switching characteristics and are applicable to wavelength-division-multiplexing photonic switching systems. However, conventional AO devices require a switching time of a few µs. In this paper an improvement of the optical switching speed is discussed. In order to increase the switching rise-time to less than a few hundred ns, gigahertz surface acoustic waves (SAWs) are used to induce mode conversion with a short AO interaction length. The optical switching characteristics of the proposed device are theoretically discussed. Crosstalk between wavelength channels, which is accompanied by switching, is also discussed.
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