Article
Chemistry, Analytical
Bairun Nie, Yuxi Ruan, Yanguang Yu, Qinghua Guo, Can Fang, Jiangtao Xi, Jun Tong, Haiping Du
Summary: In this study, a novel distance sensing method using a semiconductor laser with optical feedback is proposed. By switching between two nonlinear dynamic states, the laser intensity can be modulated in a square wave form, enabling long-distance sensing. This method offers higher flexibility and reliability compared to existing systems.
Article
Engineering, Mechanical
Haojie Liu, Xiumin Gao
Summary: This study investigates the time-delayed feedback control for a rectangular prism undergoing galloping under wind excitation. By using mathematical models and stability analysis, it is found that delayed acceleration feedback can achieve multiple control objectives and change bifurcation behavior.
NONLINEAR DYNAMICS
(2021)
Article
Physics, Multidisciplinary
Zhouyu Hu, Qiubao Wang
Summary: This paper investigates the dynamic behavior and noise effects of semiconductor laser systems, focusing on the impact of time-delay parameters on laser stability. By manipulating the time-delay parameter, the dynamic performance of semiconductor lasers can be fine-tuned, enhancing stability and spectral purity.
Article
Engineering, Electrical & Electronic
Yuanlong Fan, Kang Li, Pu Li, Bethan Copner, Nigel Joseph Copner
Summary: This article presents a novel scheme for an optical frequency comb (OFC) generator using gain switched (GS) semiconductor laser (SL) and external optical feedback (EOF), which can significantly reduce the linewidth in the OFC. By selecting appropriate system parameters, the linewidth reduction can be achieved, and it can be described by a simple analytic expression presented in the article.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Mathematics, Interdisciplinary Applications
E. Chan-Lopez, Victor Castellanos
Summary: Parasitoids play a fundamental role in the equilibrium of ecosystems and are crucial for agricultural activities as they serve as a biological control of invasive hosts. This paper studies Hopf, generalized Hopf, and nondegenerate Bogdanov-Takens bifurcations in a simple model of biological control through predation by generalist parasitoids. The authors determine geometric and parameter conditions associated with the appearance of periodic orbits and the extinction of host species. Numerical examples support the results.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Optics
Ajit Jha, Linga Reddy Cenkeramaddi, Santiago Royo
Summary: We propose a generalized mathematical model and algorithm for the multi-cavity self-mixing phenomenon based on scattering theory. The model recursively simulates individual cavity parameters to capture the interference from multiple external cavities. The investigation reveals that the equivalent reflection coefficient of coupled cavities depends on both the attenuation coefficient and the phase constant.
Article
Physics, Fluids & Plasmas
Naoki Asuke, Nicolas Chauvet, Andre Rohm, Kazutaka Kanno, Atsushi Uchida, Tomoaki Niiyama, Satoshi Sunada, Ryoichi Horisaki, Makoto Naruse
Summary: Allan variance is widely used to evaluate the stability of time series generated by atomic clocks and lasers, and it can also be beneficial in assessing chaotic oscillation dynamics of semiconductor lasers, especially in terms of low-frequency fluctuations. This study demonstrates the effectiveness of Allan variance in analyzing complex time series generated by semiconductor lasers with delayed feedback, particularly in capturing multiple time-scale dynamics, including low-frequency fluctuations. The findings suggest that Allan variance can provide insights into and characterize diverse laser dynamics spanning a wide range of timescales.
Article
Optics
Anke Zhao, Ning Jiang, Jiafa Peng, Shiqin Liu, Yiqun Zhang, Kun Qiu
Summary: A novel scheme for generating optical chaos is proposed and experimentally demonstrated, which can simultaneously produce two low-correlation chaotic signals with wideband spectrum and suppressed time-delay-signature. The proposed scheme improves the bandwidth of ECSL-based chaos by several times and generates another wideband flat-spectrum chaotic signal. The undesired TDS characteristics of the simultaneously-generated chaotic signals can be efficiently suppressed, and the correlation coefficient between these signals is small.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Engineering, Mechanical
Runeng Zhou, Yongpeng Gu, Jiang Cui, Gexue Ren, Suyuan Yu
Summary: This paper investigates the Hopf bifurcation behavior in gas foil bearing-rotor systems and provides insights into the nonlinear dynamic characteristics of systems with supercritical or subcritical Hopf bifurcations. The research demonstrates that systems with a supercritical Hopf bifurcation exhibit better dynamic characteristics, and parameter analysis shows that foil stiffness and aspect ratio have significant effects on the type of bifurcation.
NONLINEAR DYNAMICS
(2021)
Article
Optics
Katarzyna Krupa, Tomasz M. Kardas, Yuriy Stepanenko
Summary: This study demonstrates the real-time observation of double-Hopf-type breathers in an erbium-doped fiber laser and discusses their possible explanation. It provides important insights for understanding laser physics and optimizing fiber cavity design.
LASER & PHOTONICS REVIEWS
(2022)
Article
Mathematical & Computational Biology
Sarita Bugalia, Jai Prakash Tripathi, Hao Wang
Summary: This paper proposes a delayed SEIR epidemic model with intervention strategies and recovery under resource constraints. It is found that time delays change the system dynamics through Hopf bifurcation and oscillations, and the intervention strength and treatment limitations have significant impacts on infection levels. The study highlights the importance of considering time delays in intervention and recovery in epidemic models.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2021)
Article
Optics
Maria Duque Gijon, Cristina Masoller, Jordi Tiana-Alsina
Summary: Semiconductor lasers are highly sensitive to optical feedback. The transition from low-coherence radiation to high-coherence radiation in lasers with feedback can occur abruptly. Using the speckle technique, it has been shown that the transition varies from smooth to abrupt as the amount of feedback light increases.
Article
Mathematics, Interdisciplinary Applications
Rajinder Pal Kaur, Amit Sharma, Anuj Kumar Sharma
Summary: This paper analyzes the impact of fear effect and zooplankton refuge on a 3-D plankton-fish dynamical system. The findings suggest that these factors not only affect the dynamics of the ecosystem but may also terminate planktonic blooms.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Mathematics, Applied
Zhizhi Wang, Bing Hu, Luyao Zhu, Jiahui Lin, Minbo Xu, Dingjiang Wang
Summary: In this paper, a cortex-basal ganglia resonance network is used to explore the mechanism of beta oscillation through Hopf bifurcation. The model includes a direct inhibitory projection from the subthalamic nucleus (STN) to the cortex excitatory nuclei (EXN), which is different from traditional views. The critical conditions of delay for oscillation and the effects of key parameters on Hopf bifurcation points are analyzed. The results reveal the importance of delay and the impact of different parameters on amplitude and frequency of oscillation.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Optics
Jian-Chen Li, Jin-Long Xiao, Yue-De Yang, You-Ling Chen, Yong-Zhen Huang
Summary: This paper reports on the characteristics of a dual-mode circular-sided square microcavity laser, including irregular pulse packages and self-chaos operation, as well as chaotic characteristics for different longitudinal modes. The results show that the laser can provide stable parallel chaotic outputs.
PHOTONICS RESEARCH
(2023)
