Broadening-free SBS-based slow and fast light in optical fibers

Thomas Schneider; Andrzej Wiatrek

doi:10.1117/12.2047573

21 February 2014 Broadening-free SBS-based slow and fast light in optical fibers

Thomas Schneider, Andrzej Wiatrek

Proceedings Volume 8998, Advances in Slow and Fast Light VII; 89980X (2014) https://doi.org/10.1117/12.2047573
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

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.

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Thomas Schneider and Andrzej Wiatrek "Broadening-free SBS-based slow and fast light in optical fibers", Proc. SPIE 8998, Advances in Slow and Fast Light VII, 89980X (21 February 2014); https://doi.org/10.1117/12.2047573

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KEYWORDS

Slow light

Distortion

Optical amplifiers

Signal attenuation

Optical fibers

Scattering

Superposition

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