Broadening-free stimulated Brillouin scattering-based slow and fast light in optical fibers

Thomas Schneider; Andrzej Wiatrek

doi:10.1117/1.OE.53.10.102710

25 August 2014 Broadening-free stimulated Brillouin scattering-based slow and fast light in optical fibers

Thomas Schneider, Andrzej Wiatrek

Author Affiliations +

Optical Engineering, Vol. 53, Issue 10, 102710 (August 2014). https://doi.org/10.1117/1.OE.53.10.102710

Abstract

The manipulation of the group velocity of optical signals (slow and fast light) has many possible applications in telecommunications, sensing, nonlinear optics, and so on. The exploitation of the effect of stimulated Brillouin scattering (SBS) is of special interest for the alteration of the group velocity in optical fibers, since it just requires standard telecom equipment and low-to-moderate optical power. However, each delay in one single, low-gain SBS-based slow-light system is accompanied by a pulse broadening. This is a result of the inherent Kramers–Kronig relations among the gain, the phase change, and the accompanied group velocity. For an ideal flat gain, the phase change is nonideal, and for an ideal phase change the gain curve leads to a broadening. Furthermore, if the gain bandwidth is adapted to the signal by broadening, the delay will be reduced. Thus the signal broadening can be reduced by several methods for one single low-gain slow-light system, but it cannot be zero. Here, we will show how a zero-broadening SBS-based slow light can be achieved with several methods. The basic idea is a reshaping of the original pulse in a second stage by saturation of the SBS system, or by the superposition of two gains. As will be shown, all of these systems show an almost ideal overall gain and phase function over the bandwidth of the pulses. Thus, SBS-based slow light with a delay bandwidth product of 1 bit and zero distortion is possible.

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Thomas Schneider and Andrzej Wiatrek "Broadening-free stimulated Brillouin scattering-based slow and fast light in optical fibers," Optical Engineering 53(10), 102710 (25 August 2014). https://doi.org/10.1117/1.OE.53.10.102710

Published: 25 August 2014

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KEYWORDS

Slow light

Distortion

Signal attenuation

Scattering

Superposition

Light scattering

Optical fibers

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