All-optical tuning of waveguide nonlinear distributed feedback gratings

Abstract

The nonlinear properties of a distributed feedback grating in a waveguide characterized by a diffusive thermal nonlinearity were investigated experimentally. Reflection and transmission were measured in an InSb planar structure, and all-optical tuning of the reflectivity was achieved either by a guided wave incident onto the distributed feedback grating near its Bragg condition, or by a second guided beam tuned far from the Bragg condition.