  We present a strategy based on two-dimensional arrays of coupled linear
optical resonators to investigate the two-body physics of interacting bosons in
one-dimensional lattices. In particular, we want to address the bound pairs in
topologically non-trivial Su-Schrieffer-Heeger arrays. Taking advantage of the
driven-dissipative nature of the resonators, we propose spectroscopic protocols
to detect and tomographically characterize bulk doublon bands and doublon edge
states from the spatially-resolved transmission spectra, and to highlight
Feshbach resonance effects in two-body collision processes. We discuss the
experimental feasibility using state-of-the-art devices, with a specific eye on
arrays of semiconductor micropillar cavities.
