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Free-space optics (FSO) offer promising solutions in wireless systems wheremany different devices need to communicate and interoperate, exchanging massiveamounts of data as in communication and sensor networks, and in technologiesfor positioning and ranging. In these applications, control and manipulation ofthe light field is required for properly generating and correctly receiving FSObeams even in the presence of unpredictable objects and turbulence in the lightpath. In this work, we use a programmable mesh of Mach-Zehnder Interferometers(MZIs) to automatically control the complex field radiated and captured by anarray of optical antennas. Several functionalities are demonstrated, includingthe generation of perfectly shaped beams with non-perfect optical antennas, theimaging of a desired field pattern through an obstacle or a diffusive medium,and the identification of an unknown obstacle inserted in the FSO path.Compared to conventional devices used for the manipulation of FSO beams, suchas spatial light modulators (SLMs), our programmable circuit can self-configurethrough automated control strategies and can be integrated with otherfunctionalities implemented onto the same photonic chip.

Automated manipulation of free space optical beams with integrated silicon photonic meshes