Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 25, Issue 6, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2019.2937445
Keywords
Nonlinear dynamics; external optical feedback; entrainment phenomenon; quantum cascade laser; mid-infrared photonics; secure communications
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Funding
- French Defense Agency (DGA) [ANR-17-ASMA-0006]
- European Office of Aerospace Research and Development [FA9550-18-1-7001]
- Office of Naval Research [N00014-16-1-2094]
- National Science Foundation [DMR-1611598]
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This study investigates chaotic and spiking dynamics of mid-infrared quantum cascade lasers operating under external optical feedback and emitting at 5.5 mu m and 9 mu m. 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 to the generation of a regular spiking induced low-frequency 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 mu m-5 mu m and 8.5 mu m-11 mu m.
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