BASIC MODULE FOR AN INTEGRATED OPTICAL-PHASE DIFFERENCE MEASUREMENT AND CORRECTION SYSTEM

A basic module for an integrated optical phase difference measurement and correction system was developed and fabricated in the AlGaAs-GaAs material system, The relative phase difference between two waveguides is measured using waveguide couplers to sample the optical field in ea ch;waveguide, a Y-junction interferometer with a small sinusoidal phas e dither applied to one arm and a vertically integrated metal-semicond uctor-metal detector, p(+)-n(-)n(+) phase modulators are used to contr ol the phase difference between the waveguides, This implementation ma kes it possible to measure and correct the relative phase difference b etween adjacent waveguides using only a few percent of the optical pow er of each guide.