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Soviet physics. Doklady

Optical switches and transistors with increased sensitivity to variations in signal intensity and stability against fluctuations in the signal phase

A. A. Maǐer

Published Nov 1, 1990• 0 citations
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We realized an optical transistor and router utilizing multi-order fluorescence and spontaneous parametric four-wave mixing. Specifically, the optical routing action was derived from the results of splitting in the intensity signal due to a dressing effect, whereas the transistor as a switch and amplifier was realized by a switching correlation and squeezing via a nonlinear phase. A substantial enhancement of the optical contrast was observed for switching applications using correlation and squeezing contrary to the intensity signal. Moreover, the controlling parameters were also configured to devise a control mechanism for the optical transistor and router.
It is shown that abrupt transfer of radiation power is possible from one frequency to another at the output of a medium with a quadratic nonlinearity when its input is subjected to a small signal at the doubled frequency and the intensity of the signal is altered slightly under phase-matched interaction conditions and also in the case of deviation from such conditions. It is shown that an optical transistor can be constructed on the basis of this effect and that a giant gain can be achieved for a weak alternating signal.