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Abstract

The interaction of optical and acoustic waves via stimulated Brillouin
scattering (SBS) has recently reached on-chip platforms, which has
opened new fields of applications ranging from integrated microwave
photonics and on-chip narrow-linewidth lasers, to phonon-based optical
delay and signal processing schemes. Since SBS is an effect that scales
exponentially with interaction length, on-chip implementation on a short
length scale is challenging, requiring carefully designed waveguides
with optimized opto-acoustic overlap. In this work, we use the principle
of Brillouin optical correlation domain analysis to locally measure the
SBS spectrum with high spatial resolution of 800 mu m and perform a
distributed measurement of the Brillouin spectrum along a spiral
waveguide in a photonic integrated circuit. This approach gives access
to local opto-acoustic properties of the waveguides, including the
Brillouin frequency shift and linewidth, essential information for the
further development of high quality photonic-phononic waveguides for SBS
applications. (C) 2018 Author(s).