Investigation of chaotic and spiking dynamics in mid-infrared quantum cascade lasers operating continuous-waves and under current modulation

Olivier Spitz, Jia-Gui Wu, Andreas Herdt, Mathieu Carras, Wolfgang Elsaesser, Chee Wei Wong, Frederic Grillot
2019 IEEE Journal of Selected Topics in Quantum Electronics  
This study investigates chaotic and spiking dynamics of mid-infrared quantum cascade lasers operating under external optical feedback and emitting at 5.5 µm and 9 µm. In order to deepen the understanding, the route to chaos is experimentally studied in the case of continuous-wave and current modulation operation. The non-linear dynamics are analyzed with bifurcation diagrams. While for quasi-continuous wave operation, chaos is found to be more complex, pure continuous wave pumping always leads
more » ... o the generation of a regular spiking induced lowfrequency fluctuations dynamics. In the latter, results show that by combining external optical feedback with periodic forcing and further induced current modulation allows a better control of the chaotic dropouts. This work provides a novel insight into the development of future secure free-space communications based on quantum cascade lasers or unpredictable optical countermeasure systems operating within the two transparency atmospheric windows hence between 3 µm -5 µm and 8.5 µm -11 µm.
doi:10.1109/jstqe.2019.2937445 fatcat:6tfpbdrl4neidp4r755beejwvm