Generation of a 20 GHz train of subpicosecond pulses with a stabilized optical-frequency-comb generator

摘要

With a modulator-based 10 GHz optical-frequency-comb generator at 1.55 u0001m, we report a 20 GHz repeti-ntive train of optical pulses as short as 450 fs. The timing stability of the 20 GHz pulses, in addition to thenphase for optical-comb modes, shows a strong dependence on the relative frequency detuning between thencomb generator’s cavity and the seed cw laser. With a new and simple scheme, the comb generator’s cavitynresonance was locked to a narrow-linewidth seed laser within an estimated optical-frequency rangenu00026 MHz, enabling high-fidelity 20 GHz subpicosecond pulses and stable optical-frequency-comb generationnfor indefinite periods.