The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Junji Ohtsubo - One of the best experts on this subject based on the ideXlab platform.
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Chaotic dynamics in Semiconductor Lasers with optical feedback
Progress in Optics, 2020Co-Authors: Junji OhtsuboAbstract:Publisher Summary This chapter discusses the chaotic dynamics in Semiconductor Lasers with optical feedback. The chapter introduces general laser rate equations that reduce to the Lorenz equations, and the classifications of the Lasers are given. The instabilities intrinsically involved in the rate equations are studied. Semiconductor Lasers as class-B Lasers are described and the possibility for unstable oscillations of Lasers by the introduction of external perturbations is discussed. The chapter derives the forms of the rate equations for edge-emitting Semiconductor Lasers. The rate equations of the Semiconductor Lasers for various laser structures are introduced. The theory of Semiconductor Lasers with optical feedback is presented and the various effects of feedback-induced characteristics and instabilities are discussed. The chapter discusses the applications of chaos in laser systems and discusses chaos control and chaos synchronization in laser systems. As an application of chaos control in laser systems, the reduction of feedback-induced relative intensity noise (RIN) is demonstrated. The chapter presents the possibility for chaos communications based on chaos synchronization in Semiconductor Lasers with optical feedback.
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NumericalStudyofDopplerDynamicsinSelf-Mixing Semiconductor Lasers
2020Co-Authors: Junji Ohtsubo, Hiroki Kumagai, Rui ShogenjiAbstract:Wepresent anewapproach forperforming numerical simulations of optical feedback Semiconductor Lasers for moving targets. The derived rate equation for the complex electric field is suitable for the numerical analysis of the dynamics in a self-mixing Semiconductor laser with a Doppler frequency shift. We present numerical examples calculated using the rate equations.
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Stabilization of Semiconductor Lasers
Springer Series in Optical Sciences, 2012Co-Authors: Junji OhtsuboAbstract:Chaos and instabilities are not only the effects in Semiconductor Lasers with external perturbations. Semiconductor Lasers are also strongly stabilized by external perturbations under appropriate parameter conditions. Optical injection from a different laser is a typical example of laser stabilizations. Other examples are weak or strong optical feedback, phase-conjugate optical feedback, grating optical feedback, and optoelectronic feedback. The longitudinal and transverse modes, frequency, power, and polarizations of Semiconductor Lasers are stabilized by external perturbations. Stabilizations are especially important in newly developed Semiconductor Lasers (VCSELs, broad-area Semiconductor Lasers, laser arrays, and so on), since these Lasers involve instabilities even in their solitary oscillations. In this chapter, stabilization and control of Semiconductor Lasers are discussed based on rather simple configurations of external perturbations. Other than these examples, we present laser stabilizations using photonic structures and quantum-dot structures for newly developed Lasers. The control methods introduced here may not be chaos control discussed in the previous chapter, but they are closely related to the ideas of dynamic and chaos controls in Semiconductor Lasers.
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Semiconductor Lasers stability instability and chaos
2012Co-Authors: Junji OhtsuboAbstract:Lasers are essentially chaotic system. However, Semiconductor Lasers are classified into stable class B Lasers. Meanwhile, they are easily destabilized by external perturbations (introduction of extra degree of freedom). We discuss chaos in Lasers and also instability and chaos in Semiconductor Lasers. Recently, new Semiconductor Lasers with extra device structures have been developed and they are essentially unstable Lasers without any external perturbations. We also present instabilities in new Lasers and the method to control them. Applications of chaotic Semiconductor Lasers are attractive issues. Here, as an example, we discuss secure communications in chaotic Semiconductor Lasers. Keywords; Semiconductor Lasers, instability, chaos, control of chaos, chaos communications
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Semiconductor Lasers and Theory
Springer Series in Optical Sciences, 2012Co-Authors: Junji OhtsuboAbstract:We derive the essential rate equations of complex field and carrier density for Semiconductor Lasers. The Lasers we discuss here are narrow-stripe edge-emitting types, which are categorized into stable class B Lasers. We introduce important device parameters that affect the dynamics of the Lasers and also treat fundamental characteristics of solitary Semiconductor Lasers. The noise effects of the Lasers and some other topics related to the dynamics are discussed.
Shigehisa Arai - One of the best experts on this subject based on the ideXlab platform.
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Single-mode Semiconductor Lasers for long-wavelength optical fiber communications and dynamics of Semiconductor Lasers
IEEE Journal on Selected Topics in Quantum Electronics, 2000Co-Authors: Yasuharu Suematsu, Shigehisa AraiAbstract:Research activities devoted to long-wavelength optical fiber communications, especially for single-mode Semiconductor Lasers at the long-wavelength range of 1.5 μm and the dynamics of their lasing wavelength properties, which limit the transmission bandwidth of a single-mode fiber, are reviewed. Advanced Semiconductor Lasers based on the single-mode operating nature, such as wavelength tunable Lasers and photonic integrated circuits are also reviewed
K Petermann - One of the best experts on this subject based on the ideXlab platform.
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external optical feedback phenomena in Semiconductor Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 1995Co-Authors: K PetermannAbstract:The phenomena occurring in Semiconductor Lasers due to weak external optical feedback are reviewed, including mode hopping and related mode-hopping noise, linewidth narrowing and broadening, and the transition to the coherence collapse regime. Guidelines are given for designing Semiconductor Lasers, both edge emitters and VCSEL's, with high endurance against external optical feedback. >
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external optical feedback phenomena in Semiconductor Lasers
Broadband Networks: Strategies and Technologies, 1995Co-Authors: K PetermannAbstract:In optical fiber networks, the Semiconductor laser source may be subjected to unavoidable optical feedback from fiber pigtails, fiber connectors and other components, unless expensive optical isolators are used. Therefore, a good understanding of external optical feedback phenomena in Semiconductor Lasers is required. This paper will review these phenomena, including linewidth narrowing and broadening, mode hopping phenomena and the transition to the so-called coherence-collapse regime. In particular, laser designs with high endurance against optical feedback will be discussed.
Yasuharu Suematsu - One of the best experts on this subject based on the ideXlab platform.
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Semiconductor Lasers in Photonics
Journal of Lightwave Technology, 2008Co-Authors: Yasuharu SuematsuAbstract:Research activities on Semiconductor Lasers related to optical communications and information technologies are reviewed.
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Single-mode Semiconductor Lasers for long-wavelength optical fiber communications and dynamics of Semiconductor Lasers
IEEE Journal on Selected Topics in Quantum Electronics, 2000Co-Authors: Yasuharu Suematsu, Shigehisa AraiAbstract:Research activities devoted to long-wavelength optical fiber communications, especially for single-mode Semiconductor Lasers at the long-wavelength range of 1.5 μm and the dynamics of their lasing wavelength properties, which limit the transmission bandwidth of a single-mode fiber, are reviewed. Advanced Semiconductor Lasers based on the single-mode operating nature, such as wavelength tunable Lasers and photonic integrated circuits are also reviewed
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Handbook of Semiconductor Lasers and photonic integrated circuits
1994Co-Authors: Yasuharu Suematsu, Alfred Rodney AdamsAbstract:Introduction. Fundamental lightwave devices. Semiconductor optical waveguides. Radiative and non-radiative recombination in Semiconductor Lasers. Fundamental theory of Semiconductor Lasers. Advanced theory of Semiconductor Lasers. Rate-equation analysis of Semiconductor Lasers. Direct modulation characteristics of Semiconductor Lasers. Light control and noise of Semiconductor Lasers. Fabry-Perot laser diodes. Integrated Lasers. Dynamic-single-mode Lasers. Photonic integrated circuits. Epitaxy of compounds. Fabrication process of Semiconductor laser and photonic integrated circuits. Applications of Semiconductor Lasers.
U Koren - One of the best experts on this subject based on the ideXlab platform.
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Semiconductor Lasers for coherent optical fiber communications
Journal of Lightwave Technology, 1990Co-Authors: T L Koch, U KorenAbstract:The current status of Semiconductor Lasers used in coherent optical fiber communications is reviewed for nonexperts in the field. The issues of spectral purity, tuning, modulation, and advanced fabrication methods for photonic integration are discussed, with examples drawn from current experimental devices. >
