Silicon photonic optical phased array with integrated phase monitors

The optical phased array (OPA) is an emerging non-mechanical device that enables high-speed beam steering by emitting precisely phase-controlled lightwaves from numerous antennas. In practice, however, it challenging to drive all phase shifters on OPA in a deterministic manner due the inevitable fabrication-induced errors and crosstalk between shifters. this work, we fabricate 16-element silicon photonic non-redundant chip with integrated monitors experimentally demonstrate accurate monitoring of relative phases light each antenna. Under condition, retrieved on-chip varies linearly angle, as theoretically expected.