In this dissertation, mode-locked laser and gain chips have been
employed to generate ultrashort optical pulses in both monolithic
and external cavity configurations. Self-mode-locking
and passive-mode-locking were investigated in quantum-dash
and quantum-dot chips at 1550 nm wavelength range. Optical
pulses with pulse-width ranging from a few hundred of
femtoseconds up to picosecond were obtained. The laser linewidth
was characterised by fitting to Lorentzian distribution
where pulse-to-pulse timing jitter is consequently measured.
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