Optical switches having crossing network compensated phase shifters

Abstract

A plurality of corrective voltage values are obtained and used to drive a plurality of phase shifters in an optical switch photonic integrated circuit (PIC) to correct for phase errors. The optical switch PIC includes a first coupler network coupled to the plurality of phase shifters, and a second coupler network coupled to the plurality of phase shifters. The corrective voltage values are based on combinations of optical power measured at output ports in response to light received at inputs. Light is received at an input and propagated through the first coupler network. The phase shifters are driven in accordance with drive voltage values based on the plurality of corrective voltage values to apply phase modulations to the light while correcting the phase errors. The light propagates from the plurality of phase shifters through the second coupler network to output from the output ports.

Images