scholarly journals Nonlinear Dynamics of Two-State Quantum Dot Lasers under Optical Feedback

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 300
Author(s):  
Xiang-Hui Wang ◽  
Zheng-Mao Wu ◽  
Zai-Fu Jiang ◽  
Guang-Qiong Xia
Keyword(s):  
Nonlinear Dynamics ◽  
Quantum Dot ◽  
Optical Feedback ◽  
Equation Model ◽  
Quantum Dot Lasers ◽  
Nonlinear Dynamical ◽  
Phase Offset ◽  
Feedback Strength ◽  
Linewidth Enhancement ◽  
Dynamic States

A modified rate equation model was presented to theoretically investigate the nonlinear dynamics of solitary two-state quantum dot lasers (TSQDLs) under optical feedback. The simulated results showed that, for a TSQDL biased at a relatively high current, the ground-state (GS) and excited-state (ES) lasing of the TSQDL can be stimulated simultaneously. After introducing optical feedback, both GS lasing and ES lasing can exhibit rich nonlinear dynamic states including steady state (S), period one (P1), period two (P2), multi-period (MP), and chaotic (C) state under different feedback strength and phase offset, respectively, and the dynamic states for the two lasing types are always identical. Furthermore, the influences of the linewidth enhancement factor (LEF) on the nonlinear dynamical state distribution of TSQDLs in the parameter space of feedback strength and phase offset were also analyzed. For a TSQDL with a larger LEF, much more dynamical states can be observed, and the parameter regions for two lasing types operating at chaotic state are widened after introducing optical feedback.

Linewidth Enhancement Factor Impact on Optical Feedback Mutual Coupled Quantum Dot Lasers

2021 ◽  
Vol 19 (12) ◽  
pp. 37-43
Author(s):  
Rajaa H. Abd Ali ◽  
Basim A Ghalib ◽  
Ivan B. Karomi
Keyword(s):  
Quantum Dot ◽  
Data Transmission ◽  
Enhancement Factor ◽  
Optical Feedback ◽  
Chaotic Regime ◽  
Rate Equations ◽  
Quantum Dot Lasers ◽  
Linewidth Enhancement Factor ◽  
Linewidth Enhancement ◽  
Factor Α

In this article, we numerically study and analyse the roles of linewidth enhancement factor (α) in the dynamic operation of the mutual regime of the transmitter and receiver quantum dot laser lasers supported by optical feedback. A set model of adequate rate equations describing the overall dynamics in a quantum dot system subjected to optical feedback were solved numerically. The results reveal a clear chaotic regime between the receiver and the transmitter lasers at α = 3, which is incredibly advantageous for secure optical communications and encoding decoding data transmission. Moreover, at the other value of linewidth enhancement factors, namely 2, 2.5, 3.5 and 4, the optical regime works in high synchronisation with either periodic or steady state forms.

scholarly journals Nonlinear Dynamics of Interband Cascade Laser Subjected to Optical Feedback

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 366
Author(s):  
Hong Han ◽  
Xumin Cheng ◽  
Zhiwei Jia ◽  
K. Alan Shore
Keyword(s):  
Nonlinear Dynamics ◽  
Optical Feedback ◽  
External Cavity ◽  
Pump Current ◽  
Hopf Bifurcation Point ◽  
Stage Number ◽  
Feedback Strength ◽  
Interband Cascade Laser ◽  
The Stability ◽  
Linewidth Enhancement

We present a theoretical study of the nonlinear dynamics of a long external cavity delayed optical feedback-induced interband cascade laser (ICL). Using the modified Lang–Kobayashi equations, we numerically investigate the effects of some key parameters on the first Hopf bifurcation point of ICL with optical feedback, such as the delay time (τf), pump current (I), linewidth enhancement factor (LEF), stage number (m) and feedback strength (fext). It is found that compared with τf, I, LEF and m have a significant effect on the stability of the ICL. Additionally, our results show that an ICL with few stage numbers subjected to external cavity optical feedback is more susceptible to exhibiting chaos. The chaos bandwidth dependences on m, I and fext are investigated, and 8 GHz bandwidth mid-infrared chaos is observed.

Linewidth enhancement factor of InAs/InP quantum dot lasers around 1.5μm

2012 ◽  
Vol 285 (21-22) ◽  
pp. 4372-4375 ◽  
Author(s):  
Z.J. Jiao ◽  
Z.G. Lu ◽  
J.R. Liu ◽  
P.J. Poole ◽  
P.J. Barrios ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Enhancement Factor ◽  
Quantum Dot Lasers ◽  
Linewidth Enhancement Factor ◽  
Linewidth Enhancement

scholarly journals Nonlinear Dynamics of Exclusive Excited-State Emission Quantum Dot Lasers Under Optical Injection

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 58 ◽  
Author(s):  
Zai-Fu Jiang ◽  
Zheng-Mao Wu ◽  
Elumalai Jayaprasath ◽  
Wen-Yan Yang ◽  
Chun-Xia Hu ◽  
...  
Keyword(s):  
Excited State ◽  
Quantum Dot ◽  
Dynamic Properties ◽  
Optical Injection ◽  
Permutation Entropy ◽  
Frequency Detuning ◽  
Nonlinear Dynamical ◽  
Injection Coefficient ◽  
Nonlinear Dynamic Properties ◽  
Linewidth Enhancement

We numerically investigate the nonlinear dynamic properties of an exclusive excited-state (ES) emission quantum dot (QD) laser under optical injection. The results show that, under suitable injection parameters, the ES-QD laser can exhibit rich nonlinear dynamical behaviors, such as injection locking (IL), period one (P1), period two (P2), multi-period (MP), and chaotic pulsation (CP). Through mapping these dynamic states in the parameter space of the frequency detuning and the injection coefficient, it can be found that the IL occupies a wide region and the dynamic evolution routes appear in multiple forms. Via permutation entropy (PE) calculation to quantify the complexity of the CP state, the parameter range for acquiring the chaos with high complexity can be determined. Moreover, the influence of the linewidth enhancement factor (LEF) on the dynamical state of the ES-QD laser is analyzed. With the increase of the LEF value, the chaotic area shrinks (expands) in the negative (positive) frequency detuning region, and the IL region gradually shifts towards the negative frequency detuning.

scholarly journals Quantum Dot Lasers Subject to Polarization-Rotated Optical Feedback

2020 ◽  
Vol 56 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Hong Lin ◽  
Yanhua Hong ◽  
Salim Ourari ◽  
Tianyao Huang ◽  
Chen Yang
Keyword(s):  
Quantum Dot ◽  
Optical Feedback ◽  
Quantum Dot Lasers
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