Download or read book Temporal Correlations and Dynamical Transitions in Semiconductor Lasers with Optical Feedback written by Carlos Alberto Quintero Quiroz and published by . This book was released on 2017 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical excitable systems that mimic neuronal behavior have potential to be building-blocks of novel, ultra-fast, neuron-inspired photonic information processing systems. In particular, semiconductor lasers with optical feedback (SLOF) can emit optical spikes with temporal correlations resembling those present in neuronal spike. SLOF can also generate a rich variety of dynamical behaviors, and thus, are ideal testbeds for studying dynamical transitions and testing novel analysis tools. In order to advance in the development of neuron-inspired laser processors it is important to understand how SLOF represent (or encode), in the sequence of spikes, an external input. It is also important to understand how the different dynamic regimes develop, and how they are affected by external perturbations. Hence, the aim of this Thesis is the study of temporal correlations and dynamical transitions in the dynamics of an SLOF. To do this, we perform experiments, model simulations, and use a symbolic method to analyze the obtained intensity time-series. First, we investigate how the spiking laser output encodes a weak periodic input that is implemented via direct modulation of the laser pump current. Experimental sequences of optical spikes were recorded and analyzed by using the ordinal symbolic methodology that identifies and characterizes serial correlations in data sets. When changing the frequency and amplitude of the modulation, transitions among different locking regimes are detected in the form of changes in the statistics of the ordinal patterns. A good qualitative agreement is also found with simulations of the Lang and Kobayashi model. Second, we identify the onset of different dynamical regimes that occur as the laser pump current increases. We apply three analysis tools that allow quantifying various aspects of the dynamical regime transitions. The first method is based on the analysis of the standard deviation of the intensity time-series, recorded with different oscilloscope sampling rates; the second method relies on the analysis of the number of spikes as a function of the threshold used to define the spikes. The third method is based on the ordinal analysis of the inter-spike-intervals. These tools allow us to quantitatively detect the onset of two different dynamical regimes, know as low-frequency fluctuations (LFF), and coherence collapse (CC). We also analyzed the transition from a noise-dominated regime to a more deterministic (less stochastic) dynamics. For this study, in addition to the experimental laser system (an SLOF), we used as numerical examples the logistic map and the Rössler chaotic system. We find that, when the noise is strong, the permutation entropy (computed from the probabilities of the ordinal patterns) increases faster than linearly. By comparing the results of these three systems, we discuss the possibility of determining, from time series analysis, whether the underlying dynamics is dominated by noise or by deterministic processes. The results reported in this Thesis are relevant in a number of ways. The methodologies developed allow detecting parameter regions of noisy locking to an external weak periodic input and may be useful to investigate other forced excitable systems. In addition, the methods developed to detect the onset of different regimes can be valuable for analyzing regime transitions in many real world systems. Finally, the methodology for determining, for observed data, whether the underlying dynamic is mainly driven by noise or by deterministic effects can also be used in multidisciplinary applications (finances, geosciences, social systems,etc.).
Download or read book Spatio Temporal Dynamics and Quantum Fluctuations in Semiconductor Lasers written by Edeltraud Gehrig and published by Springer Science & Business Media. This book was released on 2003-09-22 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents fundamental theories and simulations of the spatio-temporal dynamics and quantum fluctuations in semiconductor lasers. The dynamic interplay of light and matter is theoretically described by taking into account microscopic carrier dynamics, spatially dependent light-field propagation and the influence of spontaneous emission and noise.
Download or read book Stochastic and Deterministic Dynamics in a Semiconductor Laser with Optical Feedback written by William Richard Ray and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Lasers written by Junji Ohtsubo and published by Springer. This book was released on 2012-10-05 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Noise Dynamics and Squeezed Light in Quantum Dot and Interband Cascade Lasers written by Shiyuan Zhao and published by Springer Nature. This book was released on with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Quantum Dot Lasers written by Christian Otto and published by Springer. This book was released on 2014-02-06 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Modal Properties of Semiconductor Lasers written by Yann Tanguy and published by . This book was released on 2005 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of semiconductor lasers has grown steadily over the years, these devices being now essential in a wide range of fields. This includes optical reading and writing of stored data, light source for optical fibres in telecommunications, medical applications, laser printing {u2026} There is an ever expanding need for higher output power and higher brightness from semiconductor devices. This can be achieved with various approaches. Unstable resonators use cavity designs with curved mirrors to yield a highly divergent beam, and counteract the self-focusing tendency of the light in laser materials. These resonators also increase the transverse mode discrimination. Both characteristics improve the beam quality, and make these devices attractive for fibre coupling applications, such as transfer of data for telecommunications. Different cavity geometries with an internal beam waist were tested, and did not display the same behaviour. In some cases we observed a displacement of the beam waist due to thermal lensing, which is not desired for fibre coupling schemes. With modelling and experimental investigations we explained this phenomenon, and proposed some cavity designs to alleviate this problem. The effect of optical feedback in lasers is a common cause of beam deterioration. Feedback on self-pulsing devices is still an important area to explore and comprehend, as this affects applications (such as optical data storage) requiring self-pulsing output powers. Some of the unstable resonators displayed self-pulsing dynamics, and the indluence of optical feedback was analysed, first experimentally, andd then theoretically with a model based on Lang-Kobayashi equations. The appearance of perturbations in the optical intensity is suggested to be linked with transition between limit cycles. The properties of semiconductor materials can also improve the beam quality. Intense research is currently focusing on Quantum Dot (QD) materials, containing nanostructures as small as 10nm which provide a nearly quantised optical gain for lasing action. Many improvements and specific characteristics are expected from these QD devices, particularly an improvement of the spatio-temporal stability of the beam. The transverse modes of broad are QD devices were experimentally examined, and dynamic instabilities characterised. The temperature profile was found to be beneficial to the transverse mode stability. In narrow wave-guide devices, simultaneous lasing in both the low and high energy levels was investigated. Simulations explained the observed decay of the low energy level lasing with increasing current. And strong antiphase dynamics were recorded between the high and low level output powers, at relatively low frequencies (below 50 M H z). Finally, interactions between longitudinal Fabry-Perot modes displayed some interesting and complex features. The output power dynamics were found to be chaotic, and the modal coupling via homogeneous broadening resulted in the appearance of frequency synchronisation. And cross-correlation measurements between modes exhibited a modal switching sequence from blue to red wavelengths, which appear to differ from periodic antiphase dynamics reported for quantum well lasers.
Download or read book Proceedings Of The 1st Experimental Chaos Conference written by Sandeep Vohra and published by World Scientific. This book was released on 1992-04-24 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first conference dedicated to the understanding of the experimental aspects of chaotic behavior in several fields and to addressing the emerging areas of data analysis and applications of nonlinear phenomena. Areas covered are data analysis and signal processing techniques, optics, applications of chaotic behavior, magnetism, nonlinear electronic circuits, spatiotemporal chaos, semiconductors, and physiology. Each paper shows real data and what can be done with it. Emphasis is on the manifestation of chaos in real systems, measuring it, analyzing it, and using it in new and unique applications.
Download or read book Numerical Study of Coherence of Optical Feedback in Semiconductor Laser Dynamics written by Mindaugas Radziunas and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The nonlinear dynamics of semiconductor laser with coherent, as compared to incoherent, delayed optical feedback systems have been discussed and contrasted in prior research literature. Here, we report simulations of how the dynamics change as the coherence of the optical feedback is systematically varied from being coherent to incoherent. An increasing rate of phase disturbance is used to vary the coherence. An edge emitting, 830 nm, Fabry Perot semiconductor laser with a long external cavity is simulated. Following this study, consideration of prior and future experimental studies should include evaluation of where on the continuum of partial coherence the delayed optical feedback sits. Partial coherence is a parameter that will affect the dynamics.
Download or read book Neuromorphic Photonics written by Paul R. Prucnal and published by CRC Press. This book was released on 2017-05-08 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book sets out to build bridges between the domains of photonic device physics and neural networks, providing a comprehensive overview of the emerging field of "neuromorphic photonics." It includes a thorough discussion of evolution of neuromorphic photonics from the advent of fiber-optic neurons to today’s state-of-the-art integrated laser neurons, which are a current focus of international research. Neuromorphic Photonics explores candidate interconnection architectures and devices for integrated neuromorphic networks, along with key functionality such as learning. It is written at a level accessible to graduate students, while also intending to serve as a comprehensive reference for experts in the field.
Download or read book Report written by Jesper Mørk and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Lasers written by Junji Ohtsubo and published by Springer. This book was released on 2017-05-03 with total page 679 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the fascinating recent advances made concerning the chaos, stability and instability of semiconductor lasers, and discusses their applications and future prospects in detail. It emphasizes the dynamics in semiconductor lasers by optical and electronic feedback, optical injection, and injection current modulation. Applications of semiconductor laser chaos, control and noise, and semiconductor lasers are also demonstrated. Semiconductor lasers with new structures, such as vertical-cavity surface-emitting lasers and broad-area semiconductor lasers, are intriguing and promising devices. Current topics include fast physical number generation using chaotic semiconductor lasers for secure communication, development of chaos, quantum-dot semiconductor lasers and quantum-cascade semiconductor lasers, and vertical-cavity surface-emitting lasers. This fourth edition has been significantly expanded to reflect the latest developments. The fundamental theory of laser chaos and the chaotic dynamics in semiconductor lasers are discussed, but also for example the method of self-mixing interferometry in quantum-cascade lasers, which is indispensable in practical applications. Further, this edition covers chaos synchronization between two lasers and the application to secure optical communications. Another new topic is the consistency and synchronization property of many coupled semiconductor lasers in connection with the analogy of the dynamics between synaptic neurons and chaotic semiconductor lasers, which are compatible nonlinear dynamic elements. In particular, zero-lag synchronization between distant neurons plays a crucial role for information processing in the brain. Lastly, the book presents an application of the consistency and synchronization property in chaotic semiconductor lasers, namely a type of neuro-inspired information processing referred to as reservoir computing.
Download or read book Spatio temporal Dynamics of Semiconductor Lasers written by Ortwin Hess and published by . This book was released on 1996 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Coherence Correlation and Decoherence in Semiconductor Nanostructures written by Toshihide Takagahara and published by Academic Press. This book was released on 2003-02-10 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanostructures are attracting a great deal of interest as the most promising device with which to implement quantum information processing and quantum computing. This book surveys the present status of nanofabrication techniques, near field spectroscopy and microscopy to assist the fabricated nanostructures. It will be essential reading for academic and industrial researchers in pure and applied physics, optics, semiconductors and microelectronics. - The first up-to-date review articles on various aspects on quantum coherence, correlation and decoherence in semiconductor nanostructures
Download or read book Optical Feedback in Semiconductor Lasers written by Lloyd Nicholas Langley and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Power Diode Lasers written by Roland Diehl and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from the basics of semiconductor lasers with emphasis on the generation of high optical output power the reader is introduced in a tutorial way to all key technologies required to fabricate high-power diode-laser sources. Various applications are exemplified.
Download or read book Laser Physics and Spectroscopy written by Vladimir L. Derbov and published by SPIE-International Society for Optical Engineering. This book was released on 2000 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
