“…Meanwhile, compared with conventional optical fiber, photonic crystal fiber (PCF) [7] exhibits more flexibility on designing optical components or sensors because of its special structure, and PCF also exhibits unique optical features, such as adjustable dispersion, endless single mode transmission, large mode area and high nonlinearity. In recent years, various ways to realize the slow or fast light in optical fibers have been exploited at room temperature, for example, coherent population oscillation (CPO) [8], stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS), optical parametric amplification (OPA) [9], and fiber Bragg grating (FBG) [10]. The fast or slow light technology based on SBS has attracted more interest due to it occurring at room temperature, operating at any wavelength, having a simple compact structure and being compatible with the existing communication system.…”