Figure 4. Harnessing the tailored DOS to fundamentally inhibit SBS in the waveguide.
(a) Spectra obtained as the wavelength of the pump (Pp=0.8 W) was scanned relative to the PBG structure. The power was just above the SBS threshold PSBS=0.6 W and a Stokes and anti-Stokes wave was generated at frequencies outside the stopband. By positioning the pump so that the Stokes wave fell into the stopband, SBS was no longer generated. (b) Pump power output with (red data points) and without (blue data points) the PBG structure. Without the grating, the pump was depleted as soon as the SBS threshold was reached, while with the grating the generation of SBS was inhibited and no pump depletion was observed. (c) Simulations of the experiment obtained by solving coupled-mode equations with and without grating confirming the measurements presented in b.