Abstract

With a modulator-based 10GHz optical-frequency-comb generator at 1.55μm, we report a 20GHz repetitive train of optical pulses as short as 450fs. The timing stability of the 20GHz pulses, in addition to the phase for optical-comb modes, shows a strong dependence on the relative frequency detuning between the comb generator’s cavity and the seed cw laser. With a new and simple scheme, the comb generator’s cavity resonance was locked to a narrow-linewidth seed laser within an estimated optical-frequency range 6MHz, enabling high-fidelity 20GHz subpicosecond pulses and stable optical-frequency-comb generation for indefinite periods.

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