Absorber length optimisation for sub-picosecond pulse generation in passively mode-locked 1.3μm quantum dot laser diodes

Through absorber length optimisation, sub-picosecond pulse generation and low timing jitter are demonstrated in a 20GHz passively mode-locked quantum-dot laser diode. Pulse-widths as low as 800fs and timing jitter performance of 390fs (20kHz-50MHz) are achieved.