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26th Optoelectronics and communications Conference, OECC 2021

作者： Zhu, Yixiao Zhang, Lei Fang, Xiansong Zhang, Fan Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

We demonstrate pilot symbol-free iterative optical field reconstruction based on modified Gerchberg-Saxton (GS) algorithm for power fading mitigation in IM-DD links. 45Gbaud PAM-4 is experimentally transmitted over 20... 详细信息

ISBN: (纸本)9781557528209

关键词： Iterative methods

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Delta-Sigma Modulation with Coherent Detection for High-Fidelity 4194304-QAM Transmission at 71.5dB SNR

Delta-Sigma Modulation with Coherent Detection for High-Fide...

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2021 Asia communications and Photonics Conference, ACP 2021

作者： Zhu, Yixiao Fang, Xiansong Yin, Longjie Zhang, Lei Zhang, Fan Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing100871 China

We experimentally demonstrate 1/2-bit delta-sigma modulation and transmission in a 40Gbaud QPSK/16-QAM coherent system. After 24km SSMF transmission, up to 2.5Gbaud 4194304-QAM Nyquist signal is successfully transmitt... 详细信息

ISBN: (纸本)9781957171005

关键词： Quadrature amplitude modulation

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Time interval measurement with linear optical sampling at the femtosecond level

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Photonics Research 2023年第12期11卷 2222-2230页

作者： DONGRUI YU ZIYANG CHEN XUAN YANG YUNLONG XU ZIYI JIN PANXUE MA YUFEI ZHANG SONG YU BIN LUO HONG GUO State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronicsand Center for Quantum InformationTechnologyPeking UniversityBeijing 100871China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

High-precision time interval measurement is a fundamental technique in many advanced applications,including time and distance metrology,particle physics,and ultra-precision ***,many of these applications are confined by the imprecise time interval measurement of electrical signals,restricting the performance of the ultimate system to a few picoseconds,which limits ultrahigh precision ***,we demonstrate an optical means for the time interval measurement of electrical signals that can successfully achieve femtosecond(fs)level *** setup is established using the optical frequency comb(OFC)based linear optical sampling(LOS)technique to realize timescale-stretched *** achieve a measurement precision of 82 fs for a single LOS scan measurement and 3.05 fs for the 100-times average with post-processing,which is three orders of magnitude higher than the results of older electrical *** high-precision time interval measurement of electrical signals can substantially improve precision measurement technologies.

关键词： optical electrical linear

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Active optical Clock Signal Based on 87Rb Atoms Cooled by 780 NM Diffuse Laser 37

Active Optical Clock Signal Based on 87Rb Atoms Cooled by 78...

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37th European Frequency and Time Forum, EFTF 2024

作者： Zhang, Jia Guan, Xiaolei Gao, Xun Miao, Jianxiang Shi, Tiantian Chen, Jingbiao School of Integrated Circuits Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing100871 China Institute of Quantum Electronics School of Electronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing100871 China Hefei National Laboratory Hefei230088 China

ISBN: (纸本)9798350354270

The cavity-pulling suppression advantage of active optical clocks (AOCs) helps to realize atomic clocks with superior performance. However, realization of continuous-wave cold-atom AOCs is a highly challenging task. In this work, we proposed an AOC scheme with diffuse-laser-cooled atoms. Combining the advantages of diffuse laser cooling to easily prepare cold-atom cloud with large volume on the scale of meters and the four-level structure to greatly reduce the light shift, it is expected to realize the continuous output of AOC superradiant signals. We experimentally realized a 100-cm-long cold 87Rb atom cloud as the gain medium. The 1367 nm AOC superradiant signal with a power of 0.3 μ W has been achieved without resonant cavity feedback. In the future, we will continue to advance the experiment and also conduct research on 420 nm blue light cooling. © 2024 IEEE.

关键词： Laser cooling

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Near-Far Field Codebook Design for IOS-Aided Multi-User communications

arXiv

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arXiv 2024年

作者： Zhang, Shupei Zhang, Yutong Di, Boya State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

Recently, the rapid development of metasurface facilitates the growth of extremely large-scale antenna arrays, making the ultra-massive MIMO possible. In this paper, we study the codebook design and beam training for an intelligent omni-surface (IOS) aided multi-user system, where the IOS is a novel metasurface enabling simultaneous signal reflection and refraction. To deal with the near field expansion caused by the large-dimension of IOS, we design a near-far field codebook to serve users both in the near and far fields without prior knowledge of user distribution. Moreover, to fully exploit the dual functionality of the IOS, the coupling between the reflective and refractive signals is analyzed theoretically and utilized in the codebook design, thereby reducing the training overhead. On this basis, the multi-user beam training is adopted where each codeword covers multiple areas to enable all users to be trained simultaneously. Simulation results verify our theoretical analysis on the reflective-refractive coupling. Compared to the state-of-the-art schemes, the proposed scheme can improve the sum rate and throughput. Copyright © 2024, The Authors. All rights reserved.

关键词： Antenna arrays

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Tunable polarization holographic gratings obtained by varying the ratio of intensities of the recording beams

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Photonics Research 2024年第4期12卷 749-754页

作者： HONG CHEN ZIYAO LYU CHANGSHUN WANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Space-Ground Integrated Information Technology Beijing Institute of Satellite Information EngineeringBeijing 100095China

Polarization holography has been extensively applied in many fields, such as optical science, metrology, and biochemistry, due to its property of polarization modulation. However, the modulated polarization state of diffracted light corresponds strictly to that of incident light one by one. Here, a kind of tunable polarization holographic grating has been designed in terms of Jones matrices, and intensity-based polarization manipulation has been realized experimentally. The proposed tunable polarization holographic grating is recorded on an azobenzene liquid-crystalline film by a pair of coherent light beams with orthogonal polarization states and asymmetrically controlled intensities. It is found that the diffracted light can be actively manipulated from linearly to circularly polarized based on the light intensity of the recording holographic field when the polarization state of incident light keeps constant. Our work could enrich the field of light manipulation and holography.

关键词： holographic recording Polarization

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Nonlinear generation of vector beams by using a compact nonlinear fork grating

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Photonics Research 2024年第5期12卷 1036-1043页

作者： QIAN YANG YANGFEIFEI YANG HAO LI HAIGANG LIU XIANFENG CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Vectorial beams have attracted great interest due to their broad applications in optical micromanipulation,optical imaging,optical micromachining,and optical *** frequency conversion is an effective technique to expand the frequency range of the vectorial ***,the scheme of existing methods to generate vector beams of the second harmonic(SH)lacks compactness in the ***,we introduce a new way to realize the generation of vector beams of SH by using a nonlinear fork grating to solve such a *** examine the properties of generated SH vector beams by using Stokes parameters,which agree well with theoretical *** we demonstrate that linearly polarized vector beams with arbitrary topological charge can be achieved by adjusting the optical axis direction of the half-wave plate(HWP).Finally,we measure the nonlinear conversion efficiency of such a *** proposed method provides a new way to generate vector beams of SH by using a microstructure of nonlinear crystal,which may also be applied in other nonlinear processes and promote all-optical waveband applications of such vector beams.

关键词： method nonlinear Nonlinear

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Ultranarrow Bandwidth optical Filter Based on Laser Cooled87Rb Atoms

Ultranarrow Bandwidth Optical Filter Based on Laser Cooled87...

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Guan, Xiaolei Zhuang, Wei Shi, Tiantian Miao, Jianxiang Zhang, Jia Chen, Jingbiao Luo, Bin Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing100871 China Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China National Institute of Metrology Beijing100029 China

ISBN: (纸本)9798350311426

We propose and implement two ultranarrow-bandwidth optical filters with different principles based on laser-cooled 87Rb atoms. Using the cold atomic cloud trapped in magneto-optical trap (MOT) to replace the vapor cell of traditional Faraday anomalous dispersion optical filter (FADOF), the effect of Doppler broadening on the transmitted bandwidth of FADOF will be effectively suppressed to the order of natural linewidth. Thus, an ultranarrow-bandwidth FADOF with a bandwidth of 2.7(2) MHz and a peak transmission of 3.2% is realized. It is the narrowest bandwidth FADOF known at present. Moreover, a transmission-enhancing method based on optical pumping is proposed. The two circularly polarized components of a linearly polarized probe laser have a large refractive index difference (induced dichroism), when it goes through the unidirectional population of atoms. Thus, forming a large rotation angle with high transmission. The two schemes can be extended to almost all kinds of atomic optical filters and may find applications in active optical frequency standard and self-stabilizing laser. © 2023 IEEE.

关键词： cold atom induced dichroism optical filter optical pumping ultranarrow-bandwidth

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Building mm Wave on the Evolving C-V2X:mm Wave NR-V2X

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China communications 2024年第1期21卷 88-101页

作者： Shanzhi Chen Xinxin He Rui Zhao Jinling Hu Xin Zhang China Information and Communication Technology Group Co. Ltd.(CICT)the State Key Laboratory of Wireless Mobile CommunicationsBeijing 100083China Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and ConvergenceBeijing University of Posts and TelecommunicationsBeijing 100876China CICT Connected and Intelligent Technologies Co. LtdChina Academy of Telecommunication TechnologyBeijing 100191China CICT Mobile Communications Technology Co.Ltd.

Since the evolving standardization of cellular V2X(C-V2X)technologies is continuously developed by 3GPP,research on new radio(NR-V2X)has been on schedule by academic and *** millimeter wave(mm Wave)frequency band is supposed to provide large transmission bandwidth,yet the development of mm Wave band in NR-V2X is still in preliminary *** this article,a comprehensive discussion of mm Wave NR-V2X is given covering trends,standardization landscape,and enabling technologies,aiming at tackling the challenge of channel modeling,directional channel access,beamforming and blockage *** vision of mm Wave NR-V2X is to fully support the development of automated driving,holographic control display and improved in-car infotainment for the future.

关键词： C-V2X enabling technologies mmWave NR-V2X

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High-Fidelity and Low-Latency Hollow-Core NANF Transmission at 2-μm Band with 112-Gbps/lambda Data-Rate and 850-m Long Distance 21

High-Fidelity and Low-Latency Hollow-Core NANF Transmission ...

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21st International Conference on optical communications and networks, ICOCN 2023

作者： Zhang, Xuelin Shen, Lei Du, Jiangbing Liu, Jiacheng Li, Peng Zhang, Lei Luo, Jie He, Zuyuan Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks 800 Dongchuan Road Minhang Shanghai200240 China Yofc State Key Laboratory of Optical Fiber and Cable Manufacture Technology Wuhan430073 China Optics Valley Laboratory Wuhan430074 China

The 2-μm-band hollow-core NANF transmission is demonstrated with the longest transmission distance of 850m at 56 Gbps and 100m at the highest Intensity-Modulation-Direct-Detection (IMDD) data rate of 112 Gbps by Disc... 详细信息

ISBN: (纸本)9798350343502

关键词： optical fiber communication

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