  We consider two interacting bosons in a dimerized Su-Schrieffer-Heeger (SSH)
lattice. We identify a rich variety of two-body states. In particular, for open
boundary conditions and moderate interactions, edge bound states (EBS) are
present even for the dimerization that does not sustain single-particle edge
states. Moreover, for large values of the interactions, we find a breaking of
the standard bulk-boundary correspondence. Based on the mapping of two
interacting particles in one dimension onto a single particle in two
dimensions, we propose an experimentally realistic coupled optical fibers setup
as quantum simulator of the two-body SSH model. This setup is able to highlight
the localization properties of the states as well as the presence of a resonant
scattering mechanism provided by a bound state that crosses the scattering
continuum, revealing the closed-channel population in real time and real space.
