  Reconfigurable linear optical networks are a key component for the
development of optical quantum information processing platforms in the NISQ era
and beyond. We report the implementation of such a device based on an
innovative design that uses the mode mixing of a multimode fiber in combination
with the programmable wavefront shaping of a SLM. The capabilities of the
platform are explored in the classical regime. For up to 8 inputs and a record
number of 38 outputs, we achieve fidelities in excess of 93%, and losses below
6.5dB. The device was built inside a standard server rack to allow for real
world use and shows consistent performance for 2x8 circuits over a period of 10
days without re-calibration.
