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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Youchao Jiang Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing China

Tunable orbital angular momentum can be generated by combining two linearly polarized modes with orthogonal polarization directions. This mode status can be obtained from the evolution of a vector mode propagating in ... 详细信息

ISBN: (纸本)9781943580705

关键词： Few mode fibers Optical angular momentum Optical fibers Optical vortices Phase shift Polarization maintaining fibers

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Mode-locking in modeless laser cavity

arXiv

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arXiv 2020年

作者： Cheng, Dan Feng, Yujun Ding, Meng Nilsson, Johan Optoelectronics Research Centre University of Southampton SouthamptonSO17 1BJ United Kingdom Institute of Lightwave Technology Key Lab of All Optical Network and Advanced Telecommunication of EMC Beijing Jiaotong University Beijing100044 China

We demonstrate experimentally that random phase modulation of an erbium-doped fiber ring-laser with an intra-cavity electro-optic phase modulator did not inhibit ultra-short pulse operation (so-called mode-locking). Stable mode-locking was achieved even when the phase modulator was driven with random sequences sufficiently fast and strong to render the cavity modeless, as determined by heterodyne measurements. No significant change in the pulse characteristics was observed. The insensitivity to the random phase modulation is expected, given the lack of phase-sensitive elements in the cavity. Copyright © 2020, The Authors. All rights reserved.

关键词： Phase modulation

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FBG Strain sensor applied in harsh environment of aerospace 3

FBG Strain sensor applied in harsh environment of aerospace

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3rd Optoelectronics Global Conference, OGC 2018

作者： Pei, Yifei Liao, Tao Xu, Jian Lin, Heng Ning, Tigang Beijing Institute of Spacecraft Environment Engineering Beijing China School of Precision Instrument and Opto-Electronics Engineering Tianjin University Tianjin China Key Lab of All Optical Network Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing China

ISBN: (纸本)9781538673973

We have designed a novel FBG strain sensor in this paper, which is optimized for aerospace application and available in harsh environment. The proposed FBG strain sensor is improved in mechanical structure and filler for aerospace, whose characteristic is investigated by FEM simulation and experimental tests. In our design we fix the grating with special mechanical structure and metal coating to ensure the stability. We have demonstrated that developed sensor could detect the minimum strain of 0.602μϵ by experiment. Our sensor has high sensitivity and good stability and can be used for many aspects in aerospace. © 2018 IEEE.

关键词： Fiber Bragg gratings

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Optimizing network resource allocation with graph pointer neural network in large-scale AI systems

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Digital Communications and networks 2024年

作者： Peiying Zhang Yilin Li Athanasios V. Vasilakos Konstantin Igorevich Kostromitin Jianyong Zhang Mohsen Guizani Qingdao Institute of Software College of Computer Science and Technology China University of Petroleum (East China) Qingdao 266580 China State Key Laboratory of Integrated Services Networks Xidian University Xi'an 710071 China Key Laboratory of Computing Power Network and Information Security Ministry of Education Shandong Computer Science Center (National Supercomputer Center in Jinan) Qilu University of Technology (Shandong Academy of Sciences) Jinan 250013 China Department of Networks and Communications College of Computer Science and Information Technology Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia Department of Physics of Nanoscale Systems South Ural State University Chelyabinsk 454080 the Russian Federation Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China Key Lab of All Optical Network and Advanced Telecommunication of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China Machine Learning Department Mohamed Bin Zayed University of Artificial Intelligence (MBZUAI) Abu Dhabi 999041 United Arab Emirates

For increasingly complex communication demands of large-scale AI communication systems, the Space-Air-Ground Integrated network (SAGIN) better caters to demands but also raises concerns about resource scarcity and diversity. This paper innovatively combines Graph Pointer Neural networks (GPNN) and Reinforcement Learning (RL) to enhance resource allocation efficiency. The method leverages the advantages of GPNN in handling graph data and RL in optimizing decisions in dynamic environments. It also targets the optimization goal of maximizing resource allocation while minimizing deployment latency. This paper begins by modeling SAGIN and elucidating the SAGIN logical architecture based on Software-defined networking (SDN). Subsequently, it introduces an SFC deployment algorithm aimed at joint optimization of resource allocation and latency. The algorithm leverages GPNN and RL to deploy virtual nodes and links, with the goal of optimizing resource allocation and deployment latency. Experiment findings conclusively demonstrate that the efficacy of proposed algorithm in effectively weighing limited heterogeneous resources and minimum mapping delay. Notably, when compared to three other SFC mapping algorithms MLRL, NFVdeep, and RL, the proposed algorithm consistently outperforms them, with an average improvement of 10.17% in long-term average reward/cost, 11.21% in link resource utilization ratio, 15.34% in node resource utilization ratio, and 16.38% in acceptance ratio.

关键词： Space-air-ground integrated network Topological structure Reinforcement learning Service function chain Graph pointer neural network

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Thermal poling of fibers with multi-anodes

Thermal poling of fibers with multi-anodes

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Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, BGPPM 2018

作者： Huang, Lin An, Honglin Hayashi, Juliano G. Ren, Guobin Stefani, Alessio Fleming, Simon School of Physics The University of Sydney NSW2006 Australia Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing100044 China D TU Fotonik Department of Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark

We demonstrate thermal poling of fibers with ~50 and ~500 anodes. The second order nonlinearity layers are developed surrounding all the rings of wires in the ~50 anode fiber and the outer rings of the ~500 anode fibe... 详细信息

ISBN: (纸本)9781943580439

关键词： Anodes

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Performance study of optical triangular-shaped pulse generation with full duty cycle

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Chinese Optics Letters 2017年第11期15卷 10-14页

作者：郝泽李晶王创业袁瑾 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing giaotong University Beijing 100044 China

A scheme of triangular-shaped pulses with full duty cycle generation is proposed and *** from the feature of orthogonal polarization,two approximate sinusoidal signals on different polarization states can be combined without inducing coherent *** tuning the time mismatching between the two signals,an approximately triangular-shaped profile can be obtained in the optical *** is found that the modulation index β is no longer a fixed one,but it can be aligned within a proper range of 0.92 to *** evaluate the proposal,impacts of radio frequency voltage fluctuation,bias voltage drift,and time mismatching are *** the defined fitting error（η≤ 3%）,the tolerable range of the modulation index,time mismatching,and voltage have been found,which insures a simple operation in practice.

关键词： triangular shaped fitting aligned coherent fluctuation drift tuning cycle proposal

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FBG Strain Sensor Applied in Harsh Environment of Aerospace

FBG Strain Sensor Applied in Harsh Environment of Aerospace

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Optoelectronics Global Conference (OGC)

作者： Yifei Pei Tao Liao Jian Xu Heng Lin Tigang Ning School of Precision Instrument and Opto-Electronics Engineering Tianjin University Tianjin China Beijing Institute of Spacecraft Environment Engineering Beijing China Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing China

We have designed a novel FBG strain sensor in this paper, which is optimized for aerospace application and available in harsh environment. The proposed FBG strain sensor is improved in mechanical structure and filler for aerospace, whose characteristic is investigated by FEM simulation and experimental tests. In our design we fix the grating with special mechanical structure and metal coating to ensure the stability. We have demonstrated that developed sensor could detect the minimum strain of 0.602με by experiment. Our sensor has high sensitivity and good stability and can be used for many aspects in aerospace.

关键词： Fiber gratings Strain Prototypes Capacitive sensors Optical fiber sensors Sensitivity

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Study on a v-band signals and pulses generator with a tunable optical carrier to sideband ratio

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Chinese Optics Letters 2017年第6期15卷 41-45页

作者：陈宏尧宁提纲李晶裴丽袁瑾温晓东 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave TechnologyBeijing Jiaotong University College of Physics and Engineering Qufu Normal University

This Letter demonstrates a filterless v-band signals and pulses generator scheme with a tunable optical carrier to sideband ratio（OCSR）. Through complete theoretical analysis, the mathematical expression of the OCSR that contains the extinction ratio, phase modulation index, and bias angle is obtained. It is found that the OCSR has a wide tuning range, from 50 to-70 d B. By careful adjustment, a 60 GHz millimeter-wave signal with the OCSR at 50.72 d B and the electrical spurious suppression ratio at 36.6 d B can be achieved. Moreover, the discussions of using optimum OCSR to generate a Nyquist pulse or triangular-shaped pulse are also presented in this Letter.

关键词： tunable generator extinction triangular adjustment suppression tuning shaped careful millimeter

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Frequency-doubled triangular shape lightwave generation with a flexible modulation index

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Chinese Optics Letters 2017年第9期15卷 56-60页

作者： Jing Li Ze Hao Li Pei Tigang Ning Jingjing Zheng Key Lab of All Optical Network&Advanced Telecommunication Network of EMC Beijing Jiaotong UniversityBeijing 100044China Institute of Lightwave Technology Beijing Jiaotong UniversityBeijing 100044China

An approach for full duty frequency-doubled triangle shape lightwave generation is proposed and *** requires a dual-parallel Mach–Zehnder modulator（DP-MZM） driven by a sinusoidal signal. A stop band filter is coupled to filter out two undesired sidebands. By tuning the bias voltage applied to the DP-MZM, the output optical intensity with a full duty cycle triangle shape profile can be obtained. It is found that the required modulation index is no longer a fixed one. It can vary within a range, without degrading the target waveform. The principle is analyzed by theory and evaluated by simulation. A proof-of-concept experiment is also *** agreements between theoretical prediction and experimental results have been found. This approach might be attractive due to the feature of a variable modulation index, which insures simple operation in practice.

关键词： Frequency-doubled triangular shape lightwave generation with a flexible modulation index MZM flexible

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Multilayer-core fiber with a large mode area and a low bending loss

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Chinese Optics Letters 2016年第12期14卷 36-40页

作者：姜有超任国斌廉玉东刘昱刘怀清李海粟任文华简伟简水生 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Institute of Lightwave Technology Beijing Jiaotong University

We present a single-mode multilayer-core fiber with a large mode area（LMA） and a low bending loss in this Letter. A low equivalent core-cladding refractive index difference is achieved by exploiting the multilayer structure. The multilayer structure has a better bending performance than a traditional step-index core and this structure also contributes to realizing different curved refractive index profiles that have a better bending performance. An index trench is also introduced to dramatically reduce the bending loss. The experimental results show that, at a wavelength of 1550 nm, the mode area of the fabricated fiber is about 215.5 μm^2 and the bending loss is 0.58 dB/turn at a 10 mm bending radius. The LMA and excellent bending performance can be obtained simultaneously with the proposed fiber.

关键词： bending trench multilayer cladding radius refractive curved hundreds straight photonic

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