Observation and enhancement of stimulated Brillouin scattering in tellurite covered silicon nitride waveguides

We show, for the first time, stimulated Brillouin scattering in tellurite covered silicon nitride waveguides. In the standard geometry the measured peak gain coefficient is 4.5 m−1W−1. We further enhance the Brillouin gain by applying cladding engineering, reaching a peak gain coefficient of 8.5 m−1W−1