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Advances in Optical Sciences Congress

Zero-Broadening, Zero-Distortion SBS-based Slow Light – an Overview

Thomas Schneider, Andrzej Wiatrek, Ronny Henker

Published Jan 1, 2009• 0 citations
Publisher

Abstract

In the last few months several “Zero-Broadening” slow light methods were presented. By a cascading any wanted delay could be possible. Here we present new results, compare these methods and discuss the underlying physics.
DOI
10.1364/sl.2009.smc3

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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.
To change the group velocity of optical signals has a lot of possible applications in telecommunications, sensing, nonlinear optics and so on. Especially the exploitation of the effect of stimulated Brillouin scattering (SBS) in optical fibers is of special interest 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 pulse broadening. This is a result of the inherent Kramers-Kronig relations between the gain, the phase-change and the accompanied group velocity. For an ideal flat gain the phase-change is non-ideal, and for an ideal phase-change the gain curve leads to a broadening. Furthermore, if the gain bandwidth is broadened in order to adapt it to the signal, the delay will be reduced. Thus, for one single low-gain slow-light system the broadening can be reduced by several methods but it cannot be zero. Here we will show how a zero-broadening SBS based slow-light system can be achieved by two different methods. The basic idea is a reshaping of the original pulse by an adapted gain in a second stage. This adaptation is achieved by the superposition of two Gaussian gain profiles or by a single saturated gain. As will be shown, these systems show an almost ideal over-all gain and phase function over the bandwidth of the pulses. Thus, SBS based slow-light with a delaybandwidth product of more than 1 bit and zero distortion is possible.
We show in theory that SBS slow- and fast-light can propagate in a cascaded system without group-velocity-dispersion (GVD) broadening and low gain broadening by use of dispersion compensation. The two GVD parameters in the normal and anomalous dispersion regions can be modulated to counteract so that we can get a zero-GVD-broadening pulse by using two broadband pumps with different powers and spectral widths. Using the method of dispersion compensation, the third-order dispersion (TOD) effect can also be canceled out simultaneously. Besides, the pulse compression occurs in the anomalous dispersion region, which contributes a low gain-broadening pulse. Therefore, this method could have the potential for different pump beam spectra.