In the comparison of the above methods, Brillouin-induced slow and fast light offers interest advantages such as moderate pump power threshold, room temperature operation and inherently compatibility with optical communication, as seen in ref. Particularly, slow and fast light has been implemented in optical fiber which makes this technique inherently compatible with optical communication systems. Tremendous approaches have been widely demonstrated by the creation of the sharp spectra resonances based on kinds of nonlinear effect, such as electromagnetically induced transparency (EIT), coherent population oscillation (CPO), stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS) and cross gain modulation (XGM). In the past few years, the control of the light speed in optical media has attracted much recent research interest due to its interesting potential applications as all-optical variable delay lines, optical signal processing and light-matter interaction enhancement.
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