Injection locking of leaky‐wave coupled resonant optical waveguide arrays

Injection locking of mutually coupled resonant antiguided arrays, consisting of up to four ten‐element arrays, has been demonstrated. External injection causes single‐longitudinal mode operation, and enhanced phase‐locking of the coupled arrays. The injected signal is distributed via leaky‐wave coupling, so that the master‐oscillator signal injected into one element (3 μm) of one array locks the whole array ensemble (223 μm wide aperture). Wavelength tuning is achieved over a 12 A spectral range for two coupled arrays, and has no impact on the coupled array far‐field pattern.