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Frontiers in Optics

Walk-off effects in dual-pump parametric amplifiers

Fatih Yaman, Qinglong Lin, Govind Prasad Agrawal

Published Jan 1, 2004• 0 citations
Publisher

Abstract

The noise figure of fiber-based parametric amplifiers is affected by intensity fluctuations associated with the pumps. We show that the effects of walk off between the signal and pumps help to improve the noise figure of dual-pump parametric amplifiers in the central flat region of the gain spectrum.
DOI
10.1364/fio.2004.fmb2

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A simple theory for predicting the effects of pump noise on the performance of parametric amplifiers has been developed and verified. It is shown that AM noise on the pump injects both FM and AM noise on the signal magnified by approximately the amplifier gain. It is also shown that FM noise on the pump can yield both FM and AM noise on the amplified signal : in this case the coupling coefficient for simple amplifiers is shown to be a function of the idler bandwidth. Analytic expressions for the maximum coupling factors are quoted for the case of a simple amplifier. Experiments on two different amplifiers are described which both support the theoretical predictions.