Calculated output power versus time at the laser facet (red line) and after GDD compensation (blue line). The inset plots the simulated optical spectrum.
There is an increasing interest toward the development of simple and compact comb laser sources. One promising application is the use of a InAs/GaAs Quantum Dot or InAs/InP Quantum Dash single section Fabry-Perot lasers. Many experiments on these devices have demonstrated the possibility of generating a wide optical spectrum of lasing longitudinal modes that are phase-locked. The phase locking is demonstrated by the very narrow RF line at the beat note frequency and by the possibility of getting pulses directly at the laser output or after group delay dispersion compensation with a proper length of dispersive optical fibre. There is however a lack of modelling work providing physical explanations on the capability of the QD lasers of generating phase locked lasing lines.
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