40-GHz pulse-train generation at 15 µm with a chirped fiber grating as a frequency multiplier

Pulse-train multiplication based on the temporal Talbot effect in a linearly chirped fiber Bragg grating has been experimentally demonstrated. A 40-GHz repetition-rate, nearly transform-limited 10-ps duration optical pulse train at $1.533 \mathit{\mu }\mathrm{m}$ has been obtained from a 2.5-GHz mode-locked Er–$\mathrm{Yb}:\mathrm{glass}$ laser by use of a 100-cm-long linearly chirped apodized fiber grating.