Phase Difference Measurement Device for Optical Phased Arrays

A phase difference measurement device for optical phased arrays, the phase difference measurement device comprising:

• at least two optical waveguides arranged in parallel in a first plane, wherein each optical waveguide comprising a proximal portion and a distal portion, wherein the proximal portion of at least one of the at least two optical waveguides further comprises a phase-shifting device configured to induce a phase shift of a light wave being transmitted in the phase difference measurement device;
• at least one phase interrogator device arranged in the first plane between two neighboring optical waveguides of the at least two optical waveguides, wherein the phase interrogator device is configured to couple light from the two neighboring optical waveguides to interfere in the phase interrogator to generate an interference light wave;
• and
• at least one photodetector configured to detect the interference light wave, wherein the least one photodetector is arranged in a second plane other than the first plane.