Ultra-low Noise Widely-Tunable Semiconductor Lasers Fully Integrated on Silicon

Using ultralow loss waveguides and a novel cavity design, we demonstrate fully integrated lasers on silicon with a fundamental linewidth lower than 200 Hz. The lasers also possess an ultrawide wavelength tuning range of 110 nm across three optical communication bands (S+C+L). These are record results for all fully integrated semiconductor lasers that have ever been reported in literature.