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Ethanol catalytic deposition of MoS2 on tapered fiber

Photonics Research 2015年第3期3卷 102-107页

作者： Hao Wang Bohua Chen Xiaoyan Zhang Sheng Liu Bangqi Zhu Jun Wang Kan Wu Jianping Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Deposition of two-dimensional（2D） MoS2 materials on the tapered fiber allows various photonic applications including saturable absorbers and four-wave *** catalytic deposition（ECD） of MoS2 on the optical tapered fiber was proposed and demonstrated in this *** from the conventional optical driven deposition using water or organic solvent,the ECD method utilized the high volatility of the ethanol solvent,which significantly increased the movement speed of the MoS2 nanosheets and thus boosted the deposition rate and reduced the minimum power threshold to drive the *** believe the ECD method should be able to be applied to other similar 2D materials such as other types of transition metal chalcogenides.

关键词： Mo than rate Ethanol catalytic deposition of MoS2 on tapered fiber EDFA

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Frequency chirp compensation of directly modulated DBR laser

Frequency chirp compensation of directly modulated DBR laser

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International Conference on Transparent optical networks

作者： Zanwei Shen Xuelin Yang Xiaonan Hu Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai P. R. China

ISBN: (纸本)9781467378819

We propose a model to analyze the frequency chirp of directly modulated distributed Bragg reflector (DBR) laser by evaluating the carrier dynamics in DBR. Due to the opposite sign of chirp in the gain and phase sections, the chirp compensation is achieved by injecting simultaneously injecting the data signals into both of the phase and gain sections in DBR laser. The simulation shows that, the overall chirp can be fully compensated, while the residual chirp at the rising and falling edges is only ~2 GHz. Moreover, the corresponding spectrum linewidth is significantly compressed after effective chirp compensation.

关键词： Chirp Distributed Bragg reflectors Refractive index Charge carrier density Frequency modulation Integrated optics Gain

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The energy distribution of the imaging spot in the ultra-wide field-of-view fisheye lens acquisition system

The energy distribution of the imaging spot in the ultra-wid...

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Congress on Image and Signal Processing, CISP

作者： Yueying Liu Bo Tu Lu Liu CNCERT/CC Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang China

This paper analyzes the energy distribution of the imaging spot in the fisheye lens acquisition system. In the establishment of optical link, a fisheye lens is used to achieve an ultra-wide field-of view (FOV) (about 180 deg), which simplifies the acquisition architecture and reduces the acquisition time. However, the severe barrel distortion of fisheye lenses, which includes the large radial distortion and the small tangential distortion, limits the application of fisheye lenses greatly. In order to calibrate the distortion of fisheye lenses, we proposes a novel inverse polynomial projection model, which is more practical than other projection models. With this model, the incident angle of a light beam can be calculated quickly from the positioning of an imaging spot. In addition, an elliptical spot energy distribution model of the imaging spot is set up based on this projection model. The specific theoretical analyses of the proposed projection model and the energy distribution model are described. Simulation results show that the energy distribution of a Gaussian beam on the charge-coupled device (CCD) turns into an ellipse in the ultra-wide FOV fisheye lens acquisition system, instead of a Gaussian energy distribution. The location of the elliptical spot goes far away from the imaging center, and the eccentricity of the ellipse trajectory enlarges with the increment of the incident angle.

关键词： Lenses Imaging Distortion Laser beams optical distortion Analytical models optical fiber communication

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Design of dual-band perfect absorber

Design of dual-band perfect absorber

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OptoElectronics and communications Conference, OECC

作者： Zhihong Chen Chun Jiang Chunmei Wang Lihui Wang Haimei Luo State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China College of Information Mechanical & Electrical Engineering Shanghai Normal University Shanghai China

A plasmonic structure is proposed to achieve perfect absorber. Numerical simulations indicate that there are two absorption peaks at wavelength 1565nm and 1998nm with absorptivity 99.93% and 99.86%, respectively. Near... 详细信息

关键词： Plasmons Absorption Metamaterials Dual band Gratings Gold Yttrium

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Chaotic signal scrambling for physical layer security in OFDM-PON

Chaotic signal scrambling for physical layer security in OFD...

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International Conference on Transparent optical networks

作者： Xuelin Yang Xiaonan Hu Zanwei Shen Hao He Weisheng Hu Chenglin Bai State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai P.R. China Shandong Key Laboratory of Optical Communication Science and Technology Liao Cheng University Liaocheng P.R. China

ISBN: (纸本)9781467378819

We propose and demonstrate physical layer security schemes via implementation of chaotic signal scrambling such as partial transmit sequence (PTS) and selected mapping (SLM) techniques in orthogonal frequency-division multiplexing passive optical network (OFDM-PON). The digital chaotic sequences are employed in PTS/SLM schemes to encrypt the OFDM data, which provides a huge key space to enhance the physical layer confidentiality. Transmission of 8.9Gb/s 16QAM encrypted OFDM signals is demonstrated over 20km standard single-mode fiber, which shows the security enhancement against malicious eavesdropping or exhaustive attacks. Moreover, the proposed secure schemes improve the OFDM transmission performance since the peak-to-average power ratio (PAPR) of the OFDM signals is significantly reduced by the signal scrambling.

关键词： Chaos Peak to average power ratio Encryption optical network units

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Three-Color Two-Photon Three-Axis Digital Scanned Light-Sheet Microscopy (3c2p3a-DSLM)

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Microscopy and Microanalysis 2015年第S3期21卷 719-720页

作者： Weijian Zong Zuosheng Liu Fuzeng Niu Shaowa Li Jia Zhao Aimin Wang Liangyi Chen The State Key Laboratory of Biomembrane and Membrane Biotechnology Institute of Molecular Medicine Peking University Beijing 100871 China Department of Cognitive Sciences Institute of Basic Medical Sciences Beijing 100850 State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

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In vivo visualization of pancreatic X-cell function in zebrafish using dual-color two-photon three-axis digital scanned light-sheet microscopy

In vivo visualization of pancreatic X-cell function in zebra...

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第九届亚洲生物物理大会

作者： Jia Zhao Weijian Zong Fuzheng Niu Xuan Zheng Aiming Wang Yanmei Liu Liangyi Chen The State Key Laboratory of Biomembrane and Membrane Biotechnology Institute of Molecular Medicine Peking University China Department of Cognitive Sciences Institute of Basic Medical Sciences State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University

Pancreatic beta-cell plays a central role in the body blood homeostasis by systematically activating glucose uptake after food intake. Diabetes arises when beta-cells are unable to meet insulin demand in the body, either due to a decrease in beta-cell mass or deterioration of beta-cell function [1]. A potential strategy is to generate massive functional beta-cells in vitro from stem cells before transplantation into patients to correct the glucose intolerance. Despite recent progresses, generation of fully functional pancreatic beta-cells in vitro is still not accomplished, which is due to the little understanding of functional maturation of pancreatic beta-cells during development in vivo. To address this question, we aim to study the functional maturation of islet beta-cells of transgenic zebrafish at different development stages in vivo. To achieve this goal, we have updated our previous two-photon three-axis digital scanned light-sheet microscopy(2P3A-DSLM)[3] in the following aspects: 1) two individual high-power femtosecond lasers with two fast Pockels cells for intensity modulation to compensate for the inhomogeneous excitation along the tunable acoustic grin(TAG) scanning range, 2) a system to scan the lightsheet in three dimensions 3) a three-axis movable sample stage coupled with a fast piezo-Z on the emission objective to collect three dimensional fluorescence signals rapidly. 4) an EMCCD cameras and a channel-split device to enable simultaneous dual-color detection of weak fluorescence *** further generated a ins:Rcamp1.07 transgenic zebrafish line, which could be used to monitor glucose-evoked Ca2+ oscillation in pancreatic beta-cells in vivo. Using this fish line, we show an important role of blood circulation per se in promoting insulin-positive cells into glucose responding, insulin-secreting matured beta-cells in vivo.

关键词： In vivo visualization of pancreatic X-cell function in zebrafish using dual-color two-photon three-axis digital scanned light-sheet microscopy

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Non-blocking 2×2 switching unit based on nested silicon microring resonators with high extinction ratios and low crosstalks

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Chinese Science Bulletin 2014年第22期59卷 2702-2708页

作者： Jiayang Wu Xinhong Jiang Ting Pan Pan Cao Liang Zhang Xiaofeng Hu Yikai Su State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

In this paper,we propose and demonstrate a2 9 2 optical Benes switching unit based on two nested silicon microring resonators(MRRs)monolithically integrated on a silicon-on-insulator(SOI)*** extinction ratios(ERs)of about 44.7/38.0 dB and low crosstalk values of about-37.5/-45.2 dB at cross/bar states are obtained with the fabricated *** operation principle is theoretically studied and the switching function is verified by system demonstration experiments with 10 and12.5 Gb/s non-return-to-zero(NRZ)*** switching speed on the order of gigahertz based on free carrier effect in silicon is also experimentally demonstrated.

关键词：切换功能消光比谐振器微环嵌套非阻塞串音器具

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Analyzing and Modeling Spatio-Temporal Dependence of Cellular Traffic at City Scale

Analyzing and Modeling Spatio-Temporal Dependence of Cellula...

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IEEE International Conference on communications

作者： Xiaming Chen Yaohui Jin Siwei Qiang Weisheng Hu Kaida Jiang State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Network and Information Center Shanghai Jiao Tong University

ISBN: (纸本)9781467364300

Traffic characteristics over space and time constitute an important aspect of cellular networks in consideration of resource provision, traffic engineering and system optimization. Despite recent progress in revealing temporal dynamics and spatial inhomogeneity of cellular traffic, limited knowledge about traffic dependence is gained. One of challenges comes from the absence of sustained observations at a network-wide scale. In this paper, we make an analysis on the week-long traffic generated by a large population of users in a city of China, and model traffic dependence along both space and time dimensions. The evaluation results suggest connections between spatio-temporal dependence of cellular traffic and the organization of human lives. Region differences are observed to impact traffic dependence to a great extent. Additionally, interactive knowledge between space and time enhances traffic prediction with a decrease in root-mean-square error of 2.8%～25.2%. We believe that these achievements will benefit multiple research and development areas such as network deploying and simulation researches.

关键词： Spatio-temporal dependence Traffic modeling Mobile measurement Correlation analysis Tide effects

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Five-partite entanglement generation in a high-Q microresonator

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Physical Review A 2015年第4期91卷 042311-042311页

作者： Yutian Wen Xufei Wu Rongyu Li Qiang Lin Guangqiang He State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Electrical and Computer Engineering University of Rochester New York 14627 USA

We propose to produce five-partite entanglement via cascaded four-wave mixing in a high-Q microresonator that may become a key to future one-way quantum computation on chip. A theoretical model is presented for the underlying continuous-variable entanglement among the generated comb modes that is expansible to more complicated scenarios. We analyze the entanglement condition when the van Loock and Furusawa criteria are violated and discuss the device parameters for potential experimental realization that may be utilized to build an integrated compact five-partite entanglement generator. The proposed approach exhibits great potential for future large-scale integrated full optical quantum computation on chip.

关键词： MICRORESONATORS (Optoelectronics) COMB filters QUANTUM computing QUANTUM systems QUANTUM states

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