Fig. 2
From: Optical analogue of the dynamical Casimir effect in a dispersion-oscillating fibre
Classical characterization of the fibre. a Zoom of the longitudinal evolution of the measured group velocity dispersion (GVD) with average value <β2> = 0.45 ps2 km−1 at the pump wavelength λp = 1052.44 nm. The total length of the fibre is 80 m. b Optical spectrum measured at the output of the dispersion-oscillating fibre (solid blue line) for high pump power Pp = 12 W and theoretical prediction from Eq. (2) (dashed black lines) for the third harmonic of the modulation frequency (m = 3)
