20 GHz transform-limited optical pulse generation and bit-error-free operation using a tunable, actively modelocked Er-doped fibre ring laser

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Abstract
The Letter reports the generation of 20 GHz, 3.0–3.5 ps transform-limited optical pulses across the wavelength tunable range 1550–1557 nm using a wavelength tunable, polarisation-maintaining actively modelocked Er3+-doped fibre ring laser. Stable bit-error-free modelocking operation is confirmed throughout the wavelength tuning range.