Fast and accurate calibration method for large-port-count Si-wire PILOSS optical switch

We propose a calibration method for N×N Si-wire path-independent-insertion-loss (PILOSS) optical switches with thermo-optic Mach-Zehnder-interferometer (MZI) element switches. Calibration for a 32x32 switch is numerically demonstrated with an error less than 1% within an hour.