Dynamics And Stochastic Properties Of Passively Mode Locked Semiconductor Lasers Subject To Optical Feedback
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Passively Mode-Locked Semiconductor Lasers
| Author | : Lina Jaurigue |
| Publisher | : Springer |
| Total Pages | : 206 |
| Release | : 2017-06-22 |
| Genre | : Science |
| ISBN | : 3319588745 |
This thesis investigates the dynamics of passively mode-locked semiconductor lasers, with a focus on the influence of optical feedback on the noise characteristics. The results presented here are important for improving the performance of passively mode-locked semiconductor lasers and, at the same time, are relevant for understanding delay-systems in general. The semi-analytic results developed are applicable to a broad range of oscillatory systems with time-delayed feedback, making the thesis of relevance to various scientific communities. Passively mode-locked lasers can produce pulse trains and have applications in the contexts of optical clocking, microscopy and optical data communication, among others. Using a system of delay differential equations to model these devices, a combination of numerical and semi-analytic methods is developed and used to characterize this system.
Unlocking Dynamical Diversity
| Author | : Deborah M. Kane |
| Publisher | : John Wiley & Sons |
| Total Pages | : 356 |
| Release | : 2005-11-01 |
| Genre | : Science |
| ISBN | : 0470856203 |
Applications of semiconductor lasers with optical feedback systems are driving rapid developments in theoretical and experimental research. The very broad wavelength-gain-bandwidth of semiconductor lasers combined with frequency-filtered, strong optical feedback create the tunable, single frequency laser systems utilised in telecommunications, environmental sensing, measurement and control. Those with weak to moderate optical feedback lead to the chaotic semiconductor lasers of private communication. This resource illustrates the diversity of dynamic laser states and the technological applications thereof, presenting a timely synthesis of current findings, and providing the roadmap for exploiting their future potential. * Provides theory-based explanations underpinned by a vast range of experimental studies on optical feedback, including conventional, phase conjugate and frequency- filtered feedback in standard, commercial and single-stripe semiconductor lasers * Includes the classic Lang-Kobayashi equation model, through to more recent theory, with new developments in techniques for solving delay differential equations and bifurcation analysis * Explores developments in self-mixing interferometry to produce sub-nanometre sensitivity in path-length measurements * Reviews tunable single frequency semiconductor lasers and systems and their diverse range of applications in sensing and optical communications * Emphasises the importance of synchronised chaotic semiconductor lasers using optical feedback and private communications systems Unlocking Dynamical Diversity illustrates all theory using real world examples gleaned from international cutting-edge research. Such an approach appeals to industry professionals working in semiconductor lasers, laser physics and laser applications and is essential reading for researchers and postgraduates in these fields.
Spatio-Temporal Modeling and Device Optimization of Passively Mode-Locked Semiconductor Lasers
| Author | : Stefan Meinecke |
| Publisher | : Springer Nature |
| Total Pages | : 264 |
| Release | : 2022-03-26 |
| Genre | : Technology & Engineering |
| ISBN | : 3030962482 |
This thesis investigates passively mode-locked semiconductor lasers by numerical methods. The understanding and optimization of such devices is crucial to the advancement of technologies such as optical data communication and dual comb spectroscopy. The focus of the thesis is therefore on the development of efficient numerical models, which are able both to perform larger parameter studies and to provide quantitative predictions. Along with that, visualization and evaluation techniques for the rich spatio-temporal laser dynamics are developed; these facilitate the physical interpretation of the observed features. The investigations in this thesis revolve around two specific semiconductor devices, namely a monolithically integrated three-section tapered quantum-dot laser and a V-shaped external cavity laser. In both cases, the simulations closely tie in with experimental results, which have been obtained in collaboration with the TU Darmstadt and the ETH Zurich. Based on the successful numerical reproduction of the experimental findings, the emission dynamics of both lasers can be understood in terms of the cavity geometry and the active medium dynamics. The latter, in particular, highlights the value of the developed simulation tools, since the fast charge-carrier dynamics are generally not experimentally accessible during mode-locking operation. Lastly, the numerical models are used to perform laser design explorations and thus to derive recommendations for further optimizations.
Nonlinear Laser Dynamics
| Author | : Kathy Lüdge |
| Publisher | : John Wiley & Sons |
| Total Pages | : 412 |
| Release | : 2012-04-09 |
| Genre | : Science |
| ISBN | : 3527639837 |
A distinctive discussion of the nonlinear dynamical phenomena of semiconductor lasers. The book combines recent results of quantum dot laser modeling with mathematical details and an analytic understanding of nonlinear phenomena in semiconductor lasers and points out possible applications of lasers in cryptography and chaos control. This interdisciplinary approach makes it a unique and powerful source of knowledge for anyone intending to contribute to this field of research. By presenting both experimental and theoretical results, the distinguished authors consider solitary lasers with nano-structured material, as well as integrated devices with complex feedback sections. In so doing, they address such topics as the bifurcation theory of systems with time delay, analysis of chaotic dynamics, and the modeling of quantum transport. They also address chaos-based cryptography as an example of the technical application of highly nonlinear laser systems.
Nonlinear and Stochastic Dynamics of Semiconductor Laser Systems
| Author | : Sergey Melnik |
| Publisher | : |
| Total Pages | : 104 |
| Release | : 2008 |
| Genre | : Semiconductor lasers |
| ISBN | : |
The work presented in this thesis is concerned with several important aspects of semiconductor laser dynamics, namely the linewidth enhancement factor (alpha-factor) of quantum dot (QD) semiconductor lasers, excitability in QD lasers with optical injection, and stochastic properties of vertical cavity surface emitting lasers (VSCSELs). Simple models predict small if not zero alpha-factor for QD materials due to their atom-like discrete energy levels, however different groups have measured very different values. These values appear to depend on the experimental method used. The analysis of QD rate equations leads to a new understanding of the alpha-factor in QD lasers. This analysis explains the large discrepancy in the experimentally measured values for the alpha-factor, and shows that conventional experimental methods must be used with care when applied to QD lasers. Excitability - an important concept in a variety of fields - has been predicted in lasers with optical injection, but not observed until recently. The theoretical analysis of the QD rate equations explains the first experimental observation of excitability in optically injected QD lasers. This analysis provides a new bifurcation scenario for the appearance of single and double excitable pulses, and also links the bifurcation pictures of QD and conventional semiconductor lasers. VCSELs can exhibit noise-induced switching between the two polarisation states. The distribution of residence times in each state is described by the well-known Kramers' rate. Two different switching rates were observed when the electric noise and the same time-delayed noise were added to the DC bias of a VCSEL. The classical Kramers' problem is extended for this case and explains the difference in the switching rates before and after the delay time. The derived analytical expressions for the switching rates are in excellent agreement with computer cluster simulations.
Dynamics of Quantum Dot Lasers
| Author | : Christian Otto |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 301 |
| Release | : 2014-01-21 |
| Genre | : Science |
| ISBN | : 3319037862 |
This thesis deals with the dynamics of state-of-the-art nanophotonic semiconductor structures, providing essential information on fundamental aspects of nonlinear dynamical systems on the one hand, and technological applications in modern telecommunication on the other. Three different complex laser structures are considered in detail: (i) a quantum-dot-based semiconductor laser under optical injection from a master laser, (ii) a quantum-dot laser with optical feedback from an external resonator, and (iii) a passively mode-locked quantum-well semiconductor laser with saturable absorber under optical feedback from an external resonator. Using a broad spectrum of methods, both numerical and analytical, this work achieves new fundamental insights into the interplay of microscopically based nonlinear laser dynamics and optical perturbations by delayed feedback and injection.
Timing Jitter of Passively Mode-locked Semiconductor Lasers Subject to Optical Feedback
| Author | : Lina Jaurigue |
| Publisher | : |
| Total Pages | : 876 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
We propose a semi-analytical method of calculating the timing fluctuations in modelocked semiconductor lasers and apply it to study the effect of delayed coherent optical feedback on pulse timing jitter in these lasers. The proposed method greatly reduces computation times and therefore allows for the investigation of the dependence of timing fluctuations over greater parameter domains. We show that resonant feedback leads to a reduction in the timing jitter and that a frequency-pulling region forms about the main resonances, within which a timing jitter reduction is observed. The width of these requency pulling regions increases linearly with short feedback delay times. We derive an analytic expression for the timing jitter, which predicts a monotonic decrease in the timing jitter for resonant feedback of increasing delay lengths, when timing jitter effects are fully separated from amplitude jitter effects. For long feedback cavities the decrease in timing jitter scales approximately as 1/tau with the increase of the feedback delay time tau.
Semiconductor Lasers
| Author | : Junji Ohtsubo |
| Publisher | : Springer |
| Total Pages | : 579 |
| Release | : 2012-10-05 |
| Genre | : Science |
| ISBN | : 3642301479 |
This third edition of “Semiconductor Lasers, Stability, Instability and Chaos” was significantly extended. In the previous edition, the dynamics and characteristics of chaos in semiconductor lasers after the introduction of the fundamental theory of laser chaos and chaotic dynamics induced by self-optical feedback and optical injection was discussed. Semiconductor lasers with new device structures, such as vertical-cavity surface-emitting lasers and broad-area semiconductor lasers, are interesting devices from the viewpoint of chaotic dynamics since they essentially involve chaotic dynamics even in their free-running oscillations. These topics are also treated with respect to the new developments in the current edition. Also the control of such instabilities and chaos control are critical issues for applications. Another interesting and important issue of semiconductor laser chaos in this third edition is chaos synchronization between two lasers and the application to optical secure communication. One of the new topics in this edition is fast physical number generation using chaotic semiconductor lasers for secure communication and development of chaos chips and their application. As other new important topics, the recent advance of new semiconductor laser structures is presented, such as quantum-dot semiconductor lasers, quantum-cascade semiconductor lasers, vertical-cavity surface-emitting lasers and physical random number generation with application to quantum key distribution. Stabilities, instabilities, and control of quantum-dot semiconductor lasers and quantum-cascade lasers are important topics in this field.
