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We present detailed numerical simulations of the laser dynamics that describeoptical frequency comb formation by injection-locking a gain-switched laser.The typical rate equations for semiconductor lasers including stochasticcarrier recombination and spontaneous emission suffice to show theinjection-locking behavior of gain switched lasers, and we show how the opticalfrequency comb evolves starting from the free-running state, right through thefinal injection- locked state. Unlike the locking of continuous wave lasers, weshow that the locking range for gain switched lasers is considerably greaterbecause injection locking can be achieved by injecting at frequencies close toone of the comb lines. The quality of the comb lines are formally assessed bycalculating the FM-noise spectral density and we show that underinjection-locking conditions the FM-noise spectral density of the comb linestend to that of the maser laser.

Numerical investigation into the injection-locking phenomena of gain switched lasers for optical frequency comb generation