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European Conference on Optical Communication

Cancellation of pulse walk-off in Raman amplifiers via slow light

Gil Fanjoux, Thibaut Sylvestre

Published Sep 1, 2008• 0 citations
Publisher

Abstract

We theoretically demonstrate in an optical fibre system that Raman pulse walk-off can be cancelled by Raman-induced slow light, leading to group-velocity matching and to an enhanced Raman gain efficiency.
DOI
10.1109/ecoc.2008.4729407

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Slow and fast light (SFL) in nonlinear media has attracted considerable interest for several years and has been observed in plenty of configurations. It generally requires a sharp spectral resonance which in turn results in a strong change of the group velocity at the resonance, thus leading to optical delaying or advancement. SFL has also been observed in optical fibres by taking advantage of the parametric gain, stimulated Brillouin or Raman scattering, leading to the development of all-optical tunable fiber-based delay lines at telecommunication wavelengths. But the implications of SFL go well beyond pulse delaying or advancement. As the group and phase velocities have to be distinguished one from another in a slow-light medium, this can have other important implications, in particular on the pulse walk-off or on the frequency chirp. We recently demonstrated in a Raman medium with normal dispersion that pulse walk-off between the pump and the signal can be cancelled out despite the large frequency detuning, leading to an increasing interaction length and enhancement Raman conversion efficiency.
The talk consists of two parts. In the first, we have demonstrated enhancement of nonlinear signals and suggested a new approach that extends Raman spectroscopy to media which has a high level of scattering. The stimulated Raman scattering has an advantage of relaxing phase-matching condition which is difficult or even impossible to meet under condition of strong scattering. The second topic is related to enhanced optico-mechanical coupling that occurs when the group velocity of light is ultra-slow. We show theoretically that, due to dragging of the light by the mechanical motion of the medium, it is possible to control phase-matching condition.