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A new family of two-dimensional triple-codeweight asymmetric optical orthogonal code for OCDMA networks

Chinese Optics Letters 2009年第2期7卷 102-105页

作者：殷洪玺梁巍马乐覃丽巧 School of Electronic and Information Engineering Dalian University of Technology State Key Laboratory on Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

A new generation algorithm of two-dimensional triple-codeweight asymmetric optical orthogonal codes for optical code division multiple access （OCDMA） networks is proposed. The code cardinality is obtained and the error-probability performance for corresponding OCDMA system is analyzed. The codes with two constraints （i.e., auto- and cross-correlation properties） being unequal are taken into account. On the premise of fixed system resources, the code of the error-probability performance, it is shown cardinality can be significantly improved. By analysis that the codes with different parameters have different performances. Therefore, this type of codes can be applied to support diverse quality of service （QoS） and satisfy the quality requirement of different multimedia or distinct users, and simultaneously make the better use of bandwidth resources in oDtical networks.

关键词： Code division multiple access Data communication systems Distributed computer systems Multimedia systems Quality of service Two dimensional

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Theoretical Modelling of Cascaded Er3+-Doped, Tm3+-Doped and Nd3+-Doped Fibers for 0.4 to 2.0 μm Emission Spectra

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Journal of Shanghai Jiaotong university(Science) 2019年第6期24卷 754-762页

作者： NKONDE Sampa JIANG Chun State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

We present a cascaded system designed with Er^3+-Doped,Tm^3+-doped and Nd^3+-doped fibers to realize amplified spontaneous emission(ASE)spectra covering 0.4—2.0μ*** system is excited with a pump laser emitting 808 nm photons with 500 m W pump *** emission spectra of the cascaded system covering0.4—2.0μm are realized with the Er^3+,Tm^3+and Nd^3+ion doping densities optimized to 8×10^19,2×10^20 and8×10^20 ion/m^3,respectively,and the fiber length optimized to 1 *** methods reveal that the peak ASE power for the cascaded system can reach 20.9 m W.A minimum ASE power of 4.39 m W is *** numerical calculations and analytical techniques,we provide a detailed insight into optimized Er^3+-doped,Tm^3+-doped and Nd^3+-doped fiber lengths and their doping concentrations for ASE power spectra covering 0.4—2.0μ*** believe that the cascaded system can potentially provide significant applications in various optical fields which include but not limited to wavelength-division multiplexing,various optical communications and other salient medical imaging processes.

关键词： cascaded fiber amplified spontaneous emission(ASE) rare-earth doped fiber

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Probing Bulk Band Topology from Time Boundary Effect in Synthetic Dimension

arXiv

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arXiv 2025年

作者： Xu, Huisheng Dong, Zhaohui Yuan, Luqi Jin, Liang School of Physics Nankai University Tianjin300071 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China

An incident wave at a temporal interface, created by an abrupt change in system parameters, generates time-refracted and time-reflected waves. We find topological characteristics associated with the temporal interface that separates distinct spatial topologies and report a novel bulk-boundary correspondence for the temporal interface. The vanishing of either time refraction or time reflection records a topological phase transition across the temporal interface, and the difference of bulk band topology predicts nontrivial braiding hidden in the time refraction and time reflection coefficients. These findings, which are insensitive to spatial boundary conditions and robust against disorder, are demonstrated in a synthetic frequency lattice with rich topological phases engendered by long-range couplings. Our work reveals the topological aspect of temporal interface and paves the way for using the time boundary effect to probe topological phase transitions and topological invariants. Copyright © 2025, The Authors. All rights reserved.

关键词： Refraction

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Binary pattern recognition for high-speed optical signal

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Recent Patents on Electrical and Electronic Engineering 2013年第1期6卷 55-62页

作者： Wu, Cen Yang, Xuelin Hu, Weisheng State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

Recent patents and progress on all-optical binary pattern recognition using the passive correlator and all-optical logic gates have been reviewed. The correlator is relative simpler and easy to be implemented, however the path number of the correlator is dependent on the length of target pattern. In contrast, the pattern recognition system based on all-optical SOA logic gates can be a promising alternative even for high bit-rate optical signals. It is shown that, the gate count can be reduced dramatically when employing serial logical processing, which allows also reconfiguration capability of the target patterns. © 2013 Bentham Science Publishers.

关键词： Pattern recognition

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Active optical clock based on four-level quantum system

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Chinese Science Bulletin 2013年第18期58卷 2033-2038页

作者： ZHANG TongGang WANG YanFei ZANG XiaoRun ZHUANG Wei CHEN JingBiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum ElectronicsSchool of Electronics Engineering & Computer SciencePeking University

Active optical clock,a new conception of atomic clock,has been proposed *** this work,we propose a scheme of active optical clock based on four-level quantum *** final accuracy and stability of two-level quantum system are limited by second-order Doppler shift of thermal atomic *** three-level quantum system,they are mainly limited by light shift of pumping laser *** limitations can be avoided effectively by applying the scheme proposed *** atom four-level quantum system,as a typical example,is *** population inversion between 6S 1/2 and 5P 3/2 states can be built up at a time scale of 10-6 *** the mechanism of active optical clock,in which the cavity mode linewidth is much wider than that of the laser gain profile,it can output a laser with quantum-limited linewidth narrower than 1 Hz in *** experimental configuration is designed to realize this active optical clock.

关键词：主动光学量子系统四能级时钟三能级系统激光增益多普勒频移粒子数反转

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Cooperative communications via Dual-Teleportation with Non-maximally Entanglement Measurements

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communications in Theoretical Physics 2012年第5期57卷 780-788页

作者：毛云郭迎曾贵华 School of Information Science&Engineering Central South University State Key Laboratory on Fiber-Optic Communication Networks and Optical Communication System Department of Electronic EngineeringShanghai Jiaotong University

We investigate a framework of the cooperative quantum teleportation (CQT) based on non-maximally entangled state basis (NB) measurements,instead of maximally entangled state basis (MB) *** is implemented with two consecutive conventional (or direct) quantum telportations (DQT),where unknown quantum states can be transmitted in a point-to-point *** security is based on the quantum-mechanical impossibility of local unitary transformations between non-maximally entangled *** shows that the CQT can enhance the successful transmissions by self-correcting the errors introduced in the dual-teleportations.

关键词： quantum teleportation Bell states non-maximally entangled state quantum information

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Accurate and broadband manipulations of harmonic amplitudes and phases to reach 256 QAM millimeter-wave wireless communications by time-domain digital coding metasurface

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National Science Review 2022年第1期9卷 36-46页

作者： Ming Zheng Chen Wankai Tang Jun Yan Dai Jun Chen Ke Lei Zhang Cheng Zhang Jin Yang Lianlin Li Qiang Cheng Shi Jin Tie Jun Cui Institute of Electromagnetic Space Southeast University State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University National Mobile Communications Research Laboratory Southeast University State Key Laboratory of Millimeter Waves Southeast University Center of Intelligent Metamaterials Pazhou Laboratory

We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface(TDCM).Using the proposed mechanism and coding strategy,we design and fabricate a millimeter-wave(mmWave) TDCM,which is composed of reprogrammable meta-atoms embedded with positive-intrinsic-negative *** controlling the duty ratios and time delays of the digital coding sequences loaded on a TDCM,experimental results show that both amplitudes and phases of different harmonics can be engineered at will simultaneously and precisely in broad frequency band from 22 to33 GHz,even when the coding states are imperfect,which is in good agreement with theoretical *** on the fabricated high-performance TDCM,we further propose and experimentally realize a large-capacity mmWave wireless communication system,where 256 quadrature amplitude modulation,along with other schemes,is *** new wireless communication system has a much simpler architecture than the currently used mmWave wireless systems,and hence can significantly reduce the hardware *** believe that the proposed method and system architecture can find vast application in future mmWave and terahertz-wave wireless communication and radar systems.

关键词： metasurface time-domain digital coding accurate and broadband harmonic control 256 QAM millimeter-wave wireless communications

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Cancelable remote quantum fingerprint templates protection scheme

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Chinese Physics B 2017年第9期26卷 39-47页

作者：廖骎郭迎黄端 School of Information Science and Engineering Central South University State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and ProcessingShanghai Jiao Tong University

With the increasing popularity of fingerprint identification technology, its security and privacy have been paid much attention. Only the security and privacy of biological information are insured, the biological technology can be better accepted and used by the public. In this paper, we propose a novel quantum bit（qbit）-based scheme to solve the security and privacy problem existing in the traditional fingerprint identification system. By exploiting the properties of quantum mechanics, our proposed scheme, cancelable remote quantum fingerprint templates protection scheme, can achieve the unconditional security guaranteed in an information-theoretical sense. Moreover, this novel quantum scheme can invalidate most of the attacks aimed at the fingerprint identification system. In addition, the proposed scheme is applicable to the requirement of remote communication with no need to worry about its security and privacy during the transmission. This is an absolute advantage when comparing with other traditional methods. Security analysis shows that the proposed scheme can effectively ensure the communication security and the privacy of users＇ information for the fingerprint identification.

关键词： quantum communication fingerprint identification cancelable template

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Propagation properties of controllable dark-hollow beams through fractional Fourier transform systems

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Optoelectronics Letters 2012年第1期8卷 67-71页

作者：唐斌李瑞鹏金铱蒋美萍 School of Mathematics&Physics Changzhou University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiaotong University

Based on the definition of fractional Fourier transform(FrFT) in the cylindrical coordinate system,the propagation properties of a controllable dark-hollow beam(CDHB) are investigated in *** analytical formula is derived for the FrFT of a *** using the derived formula,the properties of a CDHB in the FrFT plane are illustrated *** results show that the properties of the intensity of the beam in the FrFT are closely related to not only the fractional order but also initial beam parameter,beam order and the lens focal length of the optical system for performing *** derived formula provides an effective and convenient way for analyzing and calculating the FrFT of a CDHB.

关键词： Magnetic materials Optoelectronic devices

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Can communications and sensors work together in one network?

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Frontiers of Optoelectronics 2009年第2期2卷 148-152页

作者： Xinwan LI Jianping CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

With the development of both optical fiberbased communication and sensation, one interesting topic has been pointed out. How to connect those mountains of sensors to detect the signal in a large area, and how to make the cost of sensing system lower enough should be studied.A network of sensors is a good option. All sensing equipments, including the interrogators and the sensors,will be internetworking together. However, fiber optic communication networks have been developed very well over the past two decades. Is it necessary to rebuild a new network for sensors? In this paper, some new technologies in the two areas of fiber optic sensors and fiber optic communication will be addressed. Then, the available overlay architecture of a fiber optic sensors network will be presented. Finally, a polymorphous optical burst switching(POBS)-based architecture will be proposed, which can support all kinds of services, including digital data optical circuit/burst/packet switching and analog fiber optic sensor signal circuit/burst switching, etc.

关键词： optical sensor network optical communication network polymorphous optical burst switching (POBS) optical circuit switching (OCS) optical burst switching (OBS)

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