Abstract
We experimentally and theoretically demonstrate the variety of the nonlinear dynamics exhibited by a single frequency semiconductor laser subjected to optical injection from a frequency comb. The injection parameters (the detuning and the injection strength) and the comb properties (comb spacing and the amplitude of the injected comb lines) are varied to unveil several dynamics such as injection locking, wave-mixing, chaotic dynamics, and unlocked time-periodic dynamics corresponding to new comb solutions. The asymmetry of the injected comb is shown to modify the size of the injection locking region in the parameter space, as well as the common properties between the new comb solutions observed and the injected comb.
Highlights
The entrainment of the intrinsic oscillation frequency of the laser using an external oscillator has been of interest in the past forty years [1,2,3]
In this Letter we experimentally demonstrate the nonlinear dynamics of a single frequency laser under optical injection with a frequency comb
When the detuning is sufficiently close to the value that leads to the observation of the new comb region, a dynamic of wave mixing take places with additional peaks in between the comb lines being separated by Δ as can be seen in Fig. 5 (e) and (g)
Summary
The entrainment of the intrinsic oscillation frequency of the laser using an external oscillator has been of interest in the past forty years [1,2,3]. When the detuning is sufficiently close to the value that leads to the observation of the new comb region, a dynamic of wave mixing take places with additional peaks in between the comb lines being separated by Δ as can be seen in Fig. 5 (e) and (g). In the "comb3" region, for fixed , when we change the detuning from negative to positive values, we observe an abrupt increase of the number of lines in the optical spectrum This result confirms our numerical analysis in [24]. The injection experiment provides a very fine tuning of the comb properties in the injected laser
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