  Weyl points are isolated degeneracies in reciprocal space that are monopoles
of the Berry curvature. This topological charge makes them inherently robust to
Hermitian perturbations of the system. However, non-Hermitian effects, usually
inaccessible in condensed matter systems, are an important feature of photonics
systems, and when added to an otherwise Hermitian Weyl material have been
predicted to spread the Berry charge of the Weyl point out onto a ring of
exceptional points, creating a Weyl exceptional ring and fundamentally altering
its properties. Here, we observe the implications of the Weyl exceptional ring
using real-space measurements of an evanescently-coupled bipartite optical
waveguide array by probing its effects on the Fermi arc surface states, the
bulk diffraction properties, and the output power ratio of the two constituent
sublattices. This is the first realization of an object with topological Berry
charge in a non-Hermitian system.
