Scalable Low-latency Optical Phase Sensor Array

Optical phase measurement is critical for many applications, and traditional approaches often suffer from mechanical instability, temporal latency, computational complexity. In this paper, we describe compact sensor arrays based on integrated photonics, which enable accurate scalable reference-free sensing in a few steps. This achieved by connecting multiple two-port sensors into graph to measure relative phases between neighboring distant spatial locations. We propose an efficient post-processing algorithm, as well circuit design rules reduce random biased error accumulations. demonstrate the effectiveness of our system both simulations experiments with photonics circuits. The proposed measures optical directly without need external references or light modulators, thus providing significant benefits applications including microscope imaging phased arrays.