Abstract
Programmable photonic processors rely on the large-scale integration of beamsplitters and reconfigurable phase shifters, distributed within unit cells or photonic gates. In this work, we present a unit cell topology design to increase the integration density of waveguide mesh arrangements. We report the design details of a 40-unit cell waveguide mesh integrated in silicon nitride. The chip is electrically interfaced to a PCB and we report its characterization and examples of basic microwave photonic filters.
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