Abstract
The authors report the operation of a harmonically and regeneratively modelocked erbium fibre ring laser at 1.55 µm for the first time. Harmonic regenerative modelocking was achieved by feeding back the harmonic longitudinal beat signal which was detected with a high speed photodetector and a high Q dielectric filter. The repetition rate was 10 GHz and the soliton effect shortened the pulse width from 7.0 to 2.7 ps.
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