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Resonant light-light interaction in slab waaaveguides: angular filters and spectral hole burning

Andrey V. Gorbach, V. Fleurov, Sergej Flach A, Andrey E. Miroshnichenko

Published Jan 1, 2006• 2 citations
OpenAlex

Abstract

We consider a process of low-power light scattering by optical solitons in a slab waveguide with homogeneous and inhomogeneous refractive index core. We observe a resonant reflection (Fano resonance) as well as a resonant transmission of light by optical solitons at certain incident angles. All resonant effects can be controlled experimentally by changing the soliton intensity and the relative frequency detuning between the soliton and the probe light beams.

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Optics Express•Mar 31, 2011•17 citations
We consider a process of low-power light scattering by optical solitons in a slab waveguide with homogeneous and inhomogeneous refractive index core. We observe a resonant reflection (Fano resonance) as well as a resonant transmission of light by optical solitons at certain incident angles. All resonant effects can be controlled experimentally by changing the soliton intensity and the relative frequency detuning between the soliton and the probe light beams.
The principle that the coupling of light between two fiber waveguides can be controlled by the resonant interference of a third waveguide has been developed [Attard, Appl. Opt. 37, 2296-2302 (1998)]. Here significant details concerning the operation of a photonic switch are obtained, and a more complete analysis is presented. Multiple-resonant conditions are identified for slab and fiber control waveguides at large indices of refraction. Thus a selection of materials with an appropriate refractive index and a Kerr coefficient is rendered more easily. Furthermore it is shown that the light used to control the index of refraction in the control waveguide does not enter the output of the photonic switch but remains confined to the control waveguide, for either a slab or a multimode fiber control waveguide. Spatial fluctuations of the control light beam in the control waveguide do not affect the operation of the photonic switch. Tolerances have been determined for the spacing between the control waveguide and the photonic coupler and also for the index of refraction of the control waveguide.
Light propagation behavior in a resonantly absorbing waveguide array is analyzed. Both a Lorentzian line shape and an inhomogeneous broadened absorbing line shape are considered, with their imaginary and real part of the refractive index determined by a Kramers-Kronig relationship. The diffracted wave is shown to have the frequency spectra determined by the material absorption, dispersion as well as the waveguide structure. An interesting phenomenon is that a spectral hole is produced and becomes deeper in the diffraction spectrum as the thickness of the resonantly absorbing waveguide array increases. The experimental measurements conducted in a waveguide array are found to be in good agreement with the numerical results.