Abstract
A simple technique that allows for the repetition rate multiplication of optical pulse trains generated in passively modelocked fibre lasers is experimentally demonstrated. This is achieved by initiating higher-order passive modelocking by using both a dual‐channel fibre Bragg grating and a Fabry-Pérot filter inside the fibre cavity. Continuous dark pulse trains with a repetition rate of 60 GHz were generated, which is a four-fold multiplication of the Fabry-Pérot free spectral range.
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