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Resilient traffic grooming for WDM networks

JOURNAL OF OPTICAL NETWORKING 2008年第5期7卷 378-387页

作者： Jaekel, Arunita Bari, Ataul Bandyopadhyay, Subir Univ Windsor Sch Comp Sci Windsor ON N9B 3P4 Canada

Traffic grooming techniques are used to combine low-speed individual requests for connections onto high-speed lightpaths in an efficient manner. Design of survivable grooming capable networks is of critical importance. For such networks, protection may take place at the lightpath level or at the connection level. However, optimal formulations for implementing protection at either level are computationally intractable and can only be used for very small networks. We present an efficient integer linear program (ILP) formulation for the complete survivable traffic grooming problem, including topology design, traffic routing, and routing and wavelength assignment, using both dedicated and shared protection at the lightpath level. Unlike existing formulations, our ILP is able to generate optimal solutions for practical sized networks with hundreds of traffic requests. (C) 2008 Optical Society of America.

关键词： assignment algorithms Multiplexing Optical networks Ring networks Wavelength assignment Wavelength division multiplexing

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End-to-end URLLC slicing based on packet duplication in 5G optical transport networks

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JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING 2020年第7期12卷 192-199页

作者： Li, Yajie Li, Jun Zhao, Yongli Zhang, Jie Beijing Univ Posts & Telecommun Beijing 100876 Peoples R China Chalmers Univ Technol S-41296 Gothernburg Sweden

With the stringent requirements of high reliability and low latency, ultra-reliable low latency communications (URLLCs) are one of three typical services in the fifth generation of mobile network (5G) paradigm. The packet duplication (PD) technique has been proposed as a promising solution to satisfy the extreme requirements of URLLC services. However, the benefit of PD comes at the cost of doubling resource usage. This paper investigates how to efficiently perform end-to-end URLLC slicing based on PD in 5G optical transport networks. Two heuristic algorithms are proposed, including PD-based slicing with wavelength isolation (PDS-WI) and PD-based slicing with link isolation (PDS-LI). The target of this paper is to maximize the number of accommodated URLLC slices by optimizing the allocation of heterogenous resources. The time complexity of these two algorithms is analyzed in detail. With dynamic slice requests, simulations are performed to evaluate and compare their performance in terms of slice blocking probability and resource usage. Meanwhile, two different network scenarios are considered in simulation. Simulation results indicate that PDS-WI outperforms PDS-LI by accommodating more URLLC slices. (C) 2020 Optical Society of America

关键词： assignment algorithms Dense wavelength division multiplexing Network topology Optical networks Virtual reality Wavelength assignment

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Effect of feedback control on the dynamics of quantum discord with and without the rotating-wave approximation

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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 2017年第4期34卷 701-708页

作者： Cheng, Jun-qing Wu, Wei Xu, Jing-bo Zhejiang Univ Zhejiang Inst Modern Phys Hangzhou 310027 Zhejiang Peoples R China Zhejiang Univ Phys Dept Hangzhou 310027 Zhejiang Peoples R China Beijing Computat Sci Res Ctr Beijing 100193 Peoples R China

We investigate the effect of quantum-jump-based feedback on the dynamics of quantum discord for two noninteracting two-level atoms coupled to a single mode of the cavity field with and without the rotating-wave approximation. It is found that the counterrotating terms can be helpful for generating steady states, and the value of steady-state quantum discord can be increased to approach 1 in the long-time limit by feedback controls. Furthermore, we also explore the influence of the time evolutions of mean excitation number in total systems and atomic subsystems on the quantum correlations and show that the enhancement of mean excitation number in atomic subsystems by feedback controls leads to the high value of steady-state quantum discord. (C) 2017 Optical Society of America

关键词： assignment algorithms Atoms Cavity quantum electrodynamics Numerical simulation Quantum information processing Spontaneous emission

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Fast Zernike fitting of freeform surfaces using the Gauss-Legendre quadrature

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OPTICS EXPRESS 2024年第11期32卷 20011-20023页

作者： Fan, Yiwen Forbes, G. W. Rolland, Jannick P. Univ Rochester Inst Opt 480 Intercampus Dr Rochester NY 14627 USA Univ Rochester Ctr Freeform Opt Rochester NY 14627 USA Macquarie Univ Sch Math & Phys Sci Sydney NSW 2109 Australia

Zernike polynomial orthogonality, an established mathematical principle, is leveraged with the Gauss-Legendre quadrature rule in a rapid novel approach to fitting data over a circular domain. This approach provides significantly faster fitting speeds, in the order of thousands of times, while maintaining comparable error rates achieved with conventional least-square fitting techniques. We demonstrate the technique for fitting mid-spatial-frequencies (MSF) prevalent in small-tool-manufacturing typical of aspheric and freeform optics that are poised to soon permeate a wide range of optical technologies. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

关键词： Aspheric optics assignment algorithms Freeform surfaces Optical systems Systems design Zernike polynomials

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Automated 3D trajectory measuring of large numbers of moving particles

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OPTICS EXPRESS 2011年第8期19卷 7646-7663页

作者： Wu, Hai Shan Zhao, Qi Zou, Danping Chen, Yan Qiu Fudan Univ Sch Comp Sci Shanghai 200433 Peoples R China Fudan Univ Sch Informat Sci & Engn Shanghai 200433 Peoples R China

Complex dynamics of natural particle systems, such as insect swarms, bird flocks, fish schools, has attracted great attention of scientists for years. Measuring 3D trajectory of each individual in a group is vital for quantitative study of their dynamic properties, yet such empirical data is rare mainly due to the challenges of maintaining the identities of large numbers of individuals with similar visual features and frequent occlusions. We here present an automatic and efficient algorithm to track 3D motion trajectories of large numbers of moving particles using two video cameras. Our method solves this problem by formulating it as three linear assignment problems (LAP). For each video sequence, the first LAP obtains 2D tracks of moving targets and is able to maintain target identities in the presence of occlusions;the second one matches the visually similar targets across two views via a novel technique named maximum epipolar co-motion length (MECL), which is not only able to effectively reduce matching ambiguity but also further diminish the influence of frequent occlusions;the last one links 3D track segments into complete trajectories via computing a globally optimal assignment based on temporal and kinematic cues. Experiment results on simulated particle swarms with various particle densities validated the accuracy and robustness of the proposed method. As real-world case, our method successfully acquired 3D flight paths of fruit fly (Drosophila melanogaster) group comprising hundreds of freely flying individuals. (C) 2011 Optical Society of America

关键词： assignment algorithms Camera calibration Cameras CCD cameras Machine vision Stereo matching

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Shortcuts to adiabaticity in non-Hermitian quantum systems without rotating-wave approximation

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OPTICS EXPRESS 2017年第24期25卷 30135-30148页

作者： Li, Hong Shen, H. Z. Wu, S. L. Yi, X. X. Northeast Normal Univ Ctr Quantum Sci Changchun 130024 Jilin Peoples R China Northeast Normal Univ Sch Phys Changchun 130024 Jilin Peoples R China Northeast Normal Univ Ctr Adv Optoelect Funct Mat Res Changchun 130024 Jilin Peoples R China Northeast Normal Univ Key Lab UV Light Emitting Mat & Technol Minist Educ Changchun 130024 Jilin Peoples R China Dalian Nationalities Univ Sch Phys & Mat Engn Dalian 116600 Peoples R China

The technique of shortcuts to adiabaticity (STA) has attracted broad attention due to their possible applications in quantum information processing and quantum control. However, most studies published so far have been only focused on Hermitian systems under the rotating-wave approximation (RWA). In this paper, we propose a modified shortcuts to adiabaticity technique to realize population transfer for a non-Hermitian system without RWA. We work out an exact expression for the control function and present examples consisting of two-and three-level systems with decay to show the theory. The results suggest that the shortcuts to adiabaticity technique presented here is robust for fast passages. We also find that the decay has small effect on the population transfer in the three-level system. To shed more light on the physics behind this result, we reduce the quantum three-level system to an effective two-level one with large detunings. The shortcuts to adiabaticity technique of effective two-level system is studied. Thereby the high-fidelity population transfer can be implemented in non-Hermitian systems by our method, and it works even without RWA. (C) 2017 Optical Society of America

关键词： assignment algorithms Atom optics Numerical analysis Numerical simulation Quantum information processing Two level systems

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Application of 2W-PON in fairness and priority environments

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JOURNAL OF OPTICAL NETWORKING 2007年第11期6卷 1236-1243页

作者： Park, Jeauk Chung, Junhoi Park, Youngil Kookmin Univ Sch Elect Engn Seoul 136702 South Korea

Time division multiplexing-passive optical networks ( TDM-PONs) suffer from low upstream bandwidth utilization caused by guard band and various overheads. This degradation depends on optical network unit (ONU) numbers and cycle time, each of which has many effects on cost and quality, respectively. Upstream bandwidth utilization is efficiently increased by using two wavelength types at ONU sites so that overhead parts from two ONUs are overlapped in time. Each ONU is equipped with one of the two transmitting wavelengths, and an optical line terminal (OLT) schedules operation sequence. A utilization increase of up to 30% is achieved for gigabit Ethernet-passive optical network (GE-PON) by using the proposed scheme. Two operation algorithms, based on fairness and priority, are suggested and their performances are analyzed. (c) 2007 Optical Society of America.

关键词： algorithms assignment algorithms Diode lasers Gigabit passive optical networks Optical networks Passive optical networks

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Semiclassical spectra of the single- and two-photon Tavis-Cummings models

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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 2024年第8期41卷 C228-C234页

作者： Beloiarov, V. A. Valtierra, I. F. Klimov, A. B. Univ Guadalajara Dept Fis Revoluc 1500 Guadalajara 44410 Jalisco Mexico

We obtain explicit analytical expressions for the energy spectra of the resonant single- and two-photon Tavis-Cummings models in the asymptotic limit of a large number of atoms, A>> 1, and a large number of total excitations, N>> 1. We show that both the spectral singularities in the regime N/A similar to 1 and the equidistant spectra in the regime N/A >> 1 can be accurately described in the semiclassical framework. (c) 2024 Optica Publishing Group

关键词： assignment algorithms Coherent states Phase Phase space analysis methods Quantum fluctuations Squeezed states

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Fast coherent manipulation of quantum states in open systems

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OPTICS EXPRESS 2016年第19期24卷 21674-21683页

作者： Song, Jie Zhang, Zi-Jing Xia, Yan Sun, Xiu-Dong Jiang, Yong-Yuan Harbin Inst Technol Dept Phys Harbin 150001 Peoples R China Fuzhou Univ Dept Phys Fuzhou 350002 Peoples R China

We present a method to manipulate quantum states in open systems. It is shown that a high-fidelity quantum state may be generated by designing an additional Hamiltonian without rotating wave approximation. Moreover, we find that a coherent transfer is possible using quantum feedback control even when feedback parameters and noise strength can not be exactly controlled. Our results demonstrate the feasibility of constructing the shortcuts to adiabatic passage beyond rotating wave approximation in open systems. (C) 2016 Optical Society of America

关键词： assignment algorithms Cavity quantum electrodynamics Quantum information processing Quantum jumps Spontaneous emission Two level systems

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Modified distributed relative capacity loss algorithm for WDM optical networks

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JOURNAL OF OPTICAL NETWORKING 2005年第5期4卷 271-284页

作者： Dante, RG Moschim, E Martins, JF Univ Estadual Campinas Fac Engn Elect Computacao Dept Semicond Instrumentos & Foton Lab Tecnol Fot Campinas SP Brazil CEFET SP Dept Automacao Sertaozinho SP Brazil

We focus on the routing and wavelength assignment (RWA) problem in intelligent and transparent optical networks operating under no wavelength conversion constraint for end-to-end connections in distributed environments. We propose and demonstrate what we believe to be a novel wavelength assignment algorithm based on hop counts and relative capacity loss, called modified distributed relative capacity loss (MDRCL). It consists of grouping end-to-end routes with the same number of hops in MDRCL tables. Unlike the distributed relative capacity loss (DRCL) algorithm, MDRCL offers a new strategy for wavelength assignment, including the destination node in its analysis and assuming one, more than one, or even all potential routes from source node to destination nodes combined by the same number of hops in its tables. We present simulation results of dynamic traffic in a hypothetical meshed network in terms of blocking probabilities as a function of network load. We show that our MDRCL algorithm outperforms the traditional wavelength assignment algorithms. (c) 2005 Optical Society of America.

关键词： assignment algorithms Dense wavelength division multiplexing Optical networks Wavelength assignment Wavelength conversion Wavelength routing

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