oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Laser-controlled local magnetic field with semiconductor quantum rings  [PDF]
Yuriy V Pershin,Carlo Piermarocchi
Physics , 2005, DOI: 10.1103/PhysRevB.72.245331
Abstract: We analize theoretically the dynamics of N electrons localized in a semiconductor quantum ring under a train of phase-locked infrared laser pulses. The pulse sequence is designed to control the total angular momentum of the electrons. The quantum ring can be put in states characterized by strong currents. The local magnetic field created by these currents can be used for a selective quantum control of single spins in semiconductor systems.
Unidirectional open-loop chaotic synchronization communication based on a semiconductor laser with double optical feedback
基于双光反馈半导体激光器的单向开环混沌同步通信

Ding Ling,Wu Zheng-Mao,Wu Jia-Gui,Xia Guang-Qiong,
丁灵
,吴正茂,吴加贵,夏光琼

物理学报 , 2012,
Abstract: Using a semiconductor laser with double optical feedback as a chaos transmitter, a unidirectional chaotic synchronization communication system is constructed, and the performances of such a system are investigated numerically. The results show that by selecting reasonable parameters, the time delay behaviour of chaotic carrier generated by the semiconductor laser with double optical feedback can be suppressed efficiently; through the strong injection from transmitter to receiver, the perfect synchronization between transmitter and receiver can be realized, and the synchronization quality has a high tolerance to frequency detuning between transmitted laser and received laser; under the additive chaos modulation encryption scheme, the 500 Mbits/s encoded message can be hidden efficiently in the chaotic carrier and successfully extracted at the receiver.
Identical chaotic synchronization and bidirectional message transmission in incoherently coupled semiconductor laser diodes  [PDF]
I. V. Koryukin
Physics , 2008,
Abstract: A chaos-based communication scheme allowing simultaneous bidirectional message transmission (Opt. Lett. 32, 403, 2007) is investigated numerically. Incoherent feedback and coupling case is analyzed, which is expected in real long-distance optical communication systems. It is shown that identical synchronization of chaotic laser waveforms and bidirectional message transmission are possible as in the coherent coupling case. However, the chaotic regime at incoherent feedback and coupling is quite different. It is regular destabilized relaxation oscillations with the chaotic envelope. Such dynamics leads to restriction of the transmitting signal bit rate by a portion of relaxation oscillations frequency.
Synchronization and multi-mode dynamics of mutually coupled semiconductor lasers  [PDF]
Claudio R. Mirasso,Miroslav Kolesik,Marcelo Matus,J. K. White,Jerome V. Moloney
Physics , 2001, DOI: 10.1103/PhysRevA.65.013805
Abstract: Dynamics of coupled semiconductor lasers is investigated by numerical simulations. A realistic laser simulation engine is used to study the synchronization and dynamical regime in two mutually coupled Fabry-Perot and/or DFB lasers. Both, single- and multi-mode operation regimes are studied with emphasis on the role of the multiple laser-cavity modes. Our findings indicate that the two laser synchronize within each laser-cavity mode, while the synchronization across different cavity modes is significantly weaker.
Adler synchronization of spatial laser solitons pinned by defects  [PDF]
P. V. Paulau,C. McIntyre,Y. Noblet,N. Radwell,W. J. Firth,P. Colet,T. Ackemann,G. -L. Oppo
Physics , 2011,
Abstract: Defects due to growth fluctuations in broad-area semiconductor lasers induce pinning and frequency shifts of spatial laser solitons. The effects of defects on the interaction of two solitons are considered in lasers with frequency-selective feedback both theoretically and experimentally. We demonstrate frequency and phase synchronization of paired laser solitons as their detuning is varied. In both theory and experiment the locking behavior is well described by the Adler model for the synchronization of coupled oscillators.
Chaos synchronization in injection-locked semiconductor lasers with optical feedback
Liu Yu-Jin,Zhang Sheng-Hai,Qian Xing-Zhong,
刘玉金
,张胜海,钱兴中

中国物理 B , 2007,
Abstract: Based on the rate equations, we have investigated three types of chaos synchronizations in injection-locked semiconductor lasers with optical feedback. Numerical simulation shows that the synchronization can be realized by the symmetric or asymmetric laser systems. Also, the influence of parameter mismatches on chaos synchronization is investigated, and the results imply that these two lasers can achieve good synchronization, with smaller tolerance of parameter mismatch existing.
Time delayed laser networks: phase versus chaos synchronization  [PDF]
I. Reidler,M. Nixon,Y. Aviad,S. Guberman,A. A. Friesem,M. Rosenbluh,N. Davidson,I. Kanter
Physics , 2013,
Abstract: The synchronization of chaotic lasers and the optical phase synchronization of light originating in multiple coupled lasers have both been extensively studied, however, the interplay between these two phenomena, especially at the network level is unexplored. Here we experimentally compare chaos synchronization of laser networks with heterogeneous coupling delay times to phase synchronization of similar networks. While chaotic lasers exhibit deterioration in synchronization as the network time delay heterogeneity increases, phase synchronization is found to be independent of heterogeneity. The experimental results are found to be in agreement with numerical simulations for semiconductor lasers.
Parameter Mismatches and Perfect Anticipating Synchronization in bi-directionally coupled external cavity laser diodes  [PDF]
E. M. Shahverdiev,S. Sivaprakasam,K. A. Shore
Physics , 2002, DOI: 10.1103/PhysRevE.66.017206
Abstract: We study perfect chaos synchronization between two bi-directionally coupled external cavity semiconductor lasers and demonstrate for the first time that mismatches in laser photon decay rates can explain the experimentally observed anticipating time in synchronization.
Spectroscopy of nanoscopic semiconductor rings  [PDF]
A. Lorke,R. J. Luyken,A. O. Govorov,J. P. Kotthaus,J. M. Garcia,P. M. Petroff
Physics , 1999, DOI: 10.1103/PhysRevLett.84.2223
Abstract: Making use of self-assembly techniques, we demonstrate the realization of nanoscopic semiconductor quantum rings in which the electronic states are in the true quantum limit. We employ two complementary spectroscopic techniques to investigate both the ground states and the excitations of these rings. Applying a magnetic field perpendicular to the plane of the rings, we find that when approximately one flux quantum threads the interior of each ring, a change in the ground state from angular momentum $\ell = 0$ to $\ell = -1$ takes place. This ground state transition is revealed both by a drastic modification of the excitation spectrum and by a change in the magnetic field dispersion of the single-electron charging energy.
Polarization bistability and resultant spin rings in semiconductor microcavities  [PDF]
D. Sarkar,S. S. Gavrilov,M. Sich,J. H. Quilter,R. A. Bradley,N. A. Gippius,K. Guda,V. D. Kulakovskii,M. S. Skolnick,D. N. Krizhanovskii
Physics , 2010, DOI: 10.1103/PhysRevLett.105.216402
Abstract: The transmission of a pump laser resonant with the lower polariton branch of a semiconductor microcavity is shown to be highly dependent on the degree of circular polarization of the pump. Spin dependent anisotropy of polariton-polariton interactions allows the internal polarization to be controlled by varying the pump power. The formation of spatial patterns, spin rings with high degree of circular polarization, arising as a result of polarization bistability, is observed. A phenomenological model based on spin dependent Gross-Pitaevskii equations provides a good description of the experimental results. Inclusion of interactions with the incoherent exciton reservoir, which provides spin-independent blueshifts of the polariton modes, is found to be essential.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.