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An Architecture of Parallel Photonic/Electronic Packet Switching Networks

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High Technology Letters 1999年第2期5卷 19-24页

作者：李新碗 Research Institute of optical fiber Technology Natl. Lab. on Local Fiber-optic Commun. Netowrks and Advanced Optical Commun. Systems Shanghai Jiaotong University Shanghai 200030 China Centre for Network Research Department of Electronic System Engineering University of Essex Colchester C04 3SQ United Kingdom

An architecture for a future multi channel photonic packet network is proposed, which uses two wavelengths per channel. One channel wavelength (the fast wavelength) is used to carry a high speed all optical packet (the photonic packet), and the other one (the slow wavelength) to carry a low speed packet and header (the electronic packet, photonic packet header).The electronic packet is electronically interrogated at each node, the photonic packet is routed directly through (or optically Adding/Dropping) the node. A possible future framework of dual wavelength parallel photonic/electronic packet(or ATM cell based) switching is proposed, which includes a proposed format for the photonic/electronic packet, together with the functional reference model and layered architecture of the associated photonic networks. At the same time, the dual wavelength experiments are demonstrated in a system with one wavelength to carry the high speed payload and the other wavelength to carry the low speed header and electronic packet bits in the same time slot.

关键词： Switching

Kilometers Long Graphene-Coated optical fibers for Fast Thermal Sensing

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Research 2021年第1期2021卷 286-294页

作者： Yiyong Guo Bing Han Junting Du Shanshan Cao Hua Gao Ning An Yiwei Li Shujie An Zengling Ran Yue Lin Wencai Ren Yunjiang Rao Baicheng Yao Key laboratory of optical fiber Sensing and Communications(Education Ministry of China) University of Electronic Science and Technology of ChinaChengdu 611731China Research Centre of optical fiber Sensing Zhejiang LaboratoryHangzhou 310000China optical fiber Co. Ltd.ZTT GroupNantong 226009China Carbonene Technology Co. LtdDeyang 618000China optical Science and Technology Ltd. China National Petroleum CorporationChengdu 610041China Cavendish laboratory University of CambridgeCB30HEUK Shenyang National laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The combination of optical fiber with graphene has greatly expanded the application regimes of fiber optics,from dynamic optical control and ultrafast pulse generation to high precision ***,limited by fabrication,previous graphene-fiber samples are typically limited in the micrometer to centimeter scale,which cannot take the inherent advantage of optical fibers—longdistance optical ***,we demonstrate kilometers long graphene-coated optical fiber(GCF)based on industrial graphene nanosheets and coating *** GCF shows unusually high thermal diffusivity of 24.99 mm^(2) s^(-1) in the axial direction,measured by a thermal imager *** enables rapid thermooptical response both in optical fiber Bragg grating sensors at one point(18-fold faster than conventional fiber)and in long-distance distributed fiber sensing systems based on backward Rayleigh scattering in optical fiber(15-fold faster than conventional fiber).This work realizes the industrial-level graphene-fiber production and provides a novel platform for two-dimensional material-based optical fiber sensing applications.

关键词： fiber scattering faster

Graphene-Oxide-Based Q-Switched fiber Laser with Stable Five-Wavelength Operation

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Chinese Physics Letters 2012年第11期29卷 81-84页

作者： ZHAO Jun-Qing WANG Yong-Gang YAN Pei-Guang RUAN Shuang-Chen CHENG Jian-Qun DU Ge-Guo YU Yong-Qin ZHANG Ge-Lin WEI Hui-Feng LUO Jie Yuen H.Tsang Shenzhen Key laboratory of Laser Engineering College of Electronic Science and TechnologyShenzhen UniversityShenzhen 518060 Department of Applied Physics Hong Kong Polytechnic UniversityHong KongChina State Key laboratory of optical fiber and Cable Manufacture Technology Yangtze Optical Fiber and Cable Company Ltd.R&D CenterWuhan 430073

We demonstrate an erbium-doped ring-cavity fiber laser Q-switched by a graphene oxide-based saturable absorber(GOSA).The GOSA was fabricated by vertically evaporating GO-polyvinylalcohol(GO/PVA)composite dispersion,and has a good performance under room *** a specially fabricated fiber Bragg grating(FBG),stable five-wavelength lasing is realized and stabilized at different pump powers under any *** the pump power increases from 78.4 mW to 379.3 mW,the output power ranging from 1.9 mW to 16.6 mW could be obtained,with pulse duration from 6.8μs to 2.72μs,single pulse energy from 123.73 nJ to 229.74 nJ,and pulse repetition rate from 15.36 kHz to 72.25 *** the best of our knowledge,it is the first simultaneous realization of five-wavelength operation and pulse output in a GO Q-switched all fiber laser system.

关键词： pump fiber switched

Noise canceled graphene-microcavity fiber laser sensor for ultrasensitive gas detection

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光子学研究:英文版 2023年第8期11卷 I0003-I0011页

作者： YUCHEN WANG YIWEI LI YICHENG LI HAO ZHANG ZIHAN LIU YANHONG GUO ZEPING WANG JUN HE XUHAN GUO YIPING WANG BAICHENG YAO Key laboratory of optical fiber Sensing and Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 610054China Guangdong and Hong Kong Joint Research Centre for optical fiber sensors Shenzhen UniversityShenzhen 518060China State Key laboratory of Advanced optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

optical microcavities offer a promising platform for highly efficient light–matter ***,the combination of microresonators and 2D materials in the nanoscale has further enriched the optoelectronics of microcavity geometries,spurring broad advances including lasers,nonlinear converters,modulators,and ***,we report the concept of compact dual-laser cogeneration in a graphene-microcavity fiber,which offers a way to cancel the optical common mode *** by a single 980 nm pump,orthogonally polarized laser lines are generated in a pair of degeneracy breaking *** two laser lines produce a heterodyne beat note at 118.96 MHz,with frequency noise down to 200 Hz~2∕Hz at 1 MHz offset,demonstrating a linewidth of 930 Hz in *** compact device enables on-line and label-free NH_(3) gas detection with high resolution,realizing a detection limit on a single pmol/L level,and a capability to quantitatively trace gas–graphene *** a combination of graphene optoelectronics and microcavity photonics demonstrates a novel physical paradigm for microlaser control and offers a new scheme for in situ chemical sensing.

关键词： fiber laser pump

Evaluation of Slow Light Periodic Signals Considering the Distortion in EDF

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Chinese Physics Letters 2014年第3期31卷 82-85页

作者： WANG WU Chong-Qing WANG Zhi LIU Guo-Dong LIU Lan-Lan SUN Zhen-Chao Institute of optical Information and Key lab of Luminescence and optical Information Technology Beijing Jiaotong University Beijing 100044

Based on the fundamental harmonic phase delay, a new definition of fundamental harmonic fractional delay （FHFD） is proposed to evaluate slow light with the consideration of signal distortion, to eliminate the dependence on the choice of the reference point. By solving the rate equation of erbium-doped fiber （EDF）, it is shown that the slow light always accompanies the signal distortion when the periodic signal propagates in EDF, and FHFD depends on the signal distortion, as well as the average input power, the modulation depth and the length of EDF. The results of simulations and experiments indicate that the definition of FHFD is reasonable and effective to evaluate the slow light of periodic signals.

关键词： Signal distortion

Transmission spectrum method to measure the photonic bandgap of hollow-core photonic crystal fiber

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Optoelectronics Letters 2007年第1期3卷 22-24页

作者： WEI Hong-yan HOU Lan-tian ZHAO Xing-tao LIU Zhao-lun WANG Wei MA Jing-rui Institute of Infrared optical fibers and sensors Yanshan University Qinhuangdao 066004 China

A full-vector plane-wave method is introduced, particularly in calculating the photonic crystal in-plane photonic bandgap of a 2D triangular structure. Using numerical simulation, we can obtain the in-plane bandgap structure of a hollow-core photonic crystal fiber. In the experiments, we measured the transmission spectra of a hollow-core photonic crystal fiber and a silica rod. And using the numerical calculation we can get the relative transmission spectrum of a hollow-core photonic crystal fiber. Compared with the result of theoretical simulation, we found that they are in accordance with each other, i.e. they have the same bandgap in about the same normalized frequency.

关键词：空芯光子晶体光纤光子带隙测量透射谱法

Indoor Human Fall Detection Algorithm Based on Wireless Sensing

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Tsinghua Science and Technology 2022年第6期27卷 1002-1015页

作者： Chao Wang Lin Tang Meng Zhou Yinfan Ding Xueyong Zhuang Jie Wu Key laboratory of Specialty fiber Optics and optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China Department of Computer and Information Sciences Temple UniversityPhiladelphiaPA 19122-6096USA

As the main health threat to the elderly living alone and performing indoor activities,falls have attracted great attention from institutions and ***,fall detection systems are mainly based on wear sensors,environmental sensors,and computer vision,which need to be worn or require complex equipment ***,they have limitations and will interfere with the daily life of the *** the basis of the indoor propagation theory of wireless signals,this paper proposes a conceptual verification module using Wi-Fi signals to identify human fall *** module can detect falls without invading privacy and affecting human comfort and has the advantages of noninvasive,robustness,universality,and low *** module combines digital signal processing technology and machine learning *** paper analyzes and processes the channel state information(CSI)data of wireless signals,and the local outlier factor algorithm is used to find the abnormal CSI *** support vector machine and extreme gradient boosting algorithms are used for classification,recognition,and comparative *** results show that the average accuracy of fall detection based on wireless sensing is more than 90%.This work has important social significance in ensuring the safety of the elderly.

关键词： wireless signal channel status information fall detection wireless sensing

SOJOURN TIME ANALYSIS FOR CONSTANT-BIT-RATE SERVICES IN THE ATM DQDB MAN

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SOJOURN TIME ANALYSIS FOR CONSTANT-BIT-RATE SERVICES IN THE ...

Recent Advances in Phase-Sensitive optical Time Domain Reflectometry (Ф-OTDR)

1996 International Conference on Communication Technology

作者： Sun Hairong Li Lemin National Key lab.of optical fiber Communications University of Electronic Science &.Technology of China

The sojourn time of the constant-bit-rate(CBR) services in the ATM DQDB MAN is studied in this *** ATM DQDB MAN transfers any kind of services in an unified manner with CBR services obtaining

ISBN: (纸本)0780329163

The sojourn time of the constant-bit-rate(CBR) services in the ATM DQDB MAN is studied in this *** ATM DQDB MAN transfers any kind of services in an unified manner with CBR services obtaining

关键词： asynchronous transfer mode sojourn time analysis constant bit rate services ATM DQDB MAN CBR services priority level variable bit rate services VBR services delay performance

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cnki会议

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Photonic sensors 2021年第1期11卷 1-30页

作者： Yunjiang RAO Zinan WANG Huijuan WU Zengling RAN Bing HAN fiber Optics Research Center(FORC) Key Lab of Optical Fiber Sensing&CommunicationsUniversity of Electronic Science&Technology of ChinaChengdu611731China Research Center for optical fiber Sensing Zhejiang LaboratoryHangzhou310000China PetroChina optical Science&Technology(Chengdu)Ltd. Chengdu611731China

Phase-sensitive optical time domain reflectometry(Ф-OTDR)is an effective way to detect vibrations and acoustic waves with high sensitivity,by interrogating coherent Rayleigh backscattering light in sensing *** particular,fiber-optic distributed acoustic sensing(DAS)based on theФ-OTDR with phase demodulation has been extensively studied and widely used in intrusion detection,borehole seismic acquisition,structure health monitoring,etc.,in recent years,with superior advantages such as long sensing range,fast response speed,wide sensing bandwidth,low operation cost and long service *** advances in research and development(R&D)ofФ-OTDR have been made since *** this review,we present a historical review ofФ-OTDR and then summarize the recent progress ofФ-OTDR in the fiber Optics Research Center(FORC)at University of Electronic Science and Technology of China(UESTC),which is the first group to carry out R&D ofФ-OTDR and invent ultra-sensitive DAS(uDAS)seismometer in China which is elected as one of the ten most significant technology advances of PetroChina in *** can be seen that theФ-OTDR/DAS technology is currently under its rapid development stage and would reach its climax in the next 5 years.

关键词： Distributed optical fiber sensing phase-sensitive optical time domain reflectometry Rayleigh backscattering optical phase demodulation distributed acoustic sensing long-distance sensing artificial intelligence