Sub-30-fs fibre-coupled electro-optic modulation comb at 1.5 μm with a 25-GHz repetition rate

Abstract

The generation of a 24-fs fibre-coupled electro-optic-modulation (EO) comb at 1.5 μm with a 25-GHz repetition rate, which is the shortest pulse, is demonstrated. The authors also generated a 2/3-octave spanning supercontinuum spectrum using precise dispersion-controlled silicon nitride waveguides. This method can open new horizons to generate a compact and robust carrier-envelope-offset-locked EO comb.