Nonlinear Dynamics in Semiconductor Quantum Dot Laser Subject to Double Delayed Feedback: Numerical Analysis
- PDF / 1,471,145 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 78 Downloads / 198 Views
GENERAL AND APPLIED PHYSICS
Nonlinear Dynamics in Semiconductor Quantum Dot Laser Subject to Double Delayed Feedback: Numerical Analysis Jian-Wei Wu 1 & Hai-Bo Bao 2 Received: 25 April 2020 / # Sociedade Brasileira de Física 2020
Abstract In this study, the research on the nonlinear dynamics of semiconductor quantum dot laser with two time-delayed optical feedbacks is numerically investigated. Results show that the nonlinear dynamics behaviors of the laser are very sensitive to the rich system parameters in which both feedback strength and bias current are easily controlled to significantly influence the nonlinear dynamics including the periodic state and chaotic state. By judiciously adjusting the bias current of the laser or the feedback strength in the external cavity, period one, period doubling, quasi-period, and chaos are achieved. The feedback levelrelated bifurcation diagrams are analyzed in detail while fixing another feedback level at a constant or varying the bias current. In addition, the translation variables of the 0–1 test method that are clearly bounded for regular behavior and exhibit the Brownian motion for irregular phenomenon are adopted to further evaluate the periodic state and the chaotic state. These results can give insight into the quantum dot laser–based applications in various optical technologies. Keywords Semiconductor . Quantum dot laser . Double delayed feedbacks . Nonlinear dynamics
1 Introduction The nonlinear dynamics induced by additional perturbations including the external injections and/or time-delayed optical feedbacks have been continuously researched for several decades owing to their prominent virtues based on the conventional semiconductor laser such as Fabry-Perot cavity [1, 2], distributed feedback [3, 4], and quantum well lasing structure [5–7]. In these reported results, one can see that both theoretical model and experimental studies are intensively presented to observe the rich nonlinear behaviors including the periodic, quasi-periodic, and chaotic phenomena by judiciously adjusting the strengths of external injections and/or optical feedbacks. The achieved dynamical results are widely used
* Jian-Wei Wu [email protected] Hai-Bo Bao [email protected] 1
School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, People’s Republic of China
2
School of Mathematics and Statistics, Southwest University, Chongqing 400715, People’s Republic of China
to perform the photonic microwave signals [8, 9], secure optical communications [10], optical switching [11], radar [12], all-optical AM-to-FM conversion [13], and radio-over-fiber links [14]. Generally, the conventional quantum well laser has a large line width enhancement factor that results in the large chaotic region with the change of external injection or feedback level [15]. In recent years, another kind of laser, i.e., semiconductor quantum dot (QD) laser [16–20], has been presented and demonstrated to develop the family of the semiconductor laser. Compared with the quantum well la
Data Loading...
