Resonant light-light interaction in slab waveguides: angular filters and   spectral hole burning
  We consider the process of low-power light scattering by optical solitons in a slab waveguide with homogeneous and inhomogeneous refractive index core. We observe resonant reflection (Fano resonance) as well as resonant transmission of light by optical solitons at certain incident angles. The resonance position can be controlled experimentally by changing the soliton intensity and the relative frequency detuning between the soliton and the probe light beams. 
A.V. Gorbach, V. Fleurov, S. Flach, A.E. Miroshnichenko