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20th International Conference on optical communications and networks, ICOCN 2022

作者： Chen, Xi Li, Jiaji Zhu, Yixiao Yin, Longjie Zhuge, Qunbi Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

We propose and experimentally demonstrate a digital coherent fronthaul system exploiting sample bits interleaving and uneven 16-QAM. The results indicate that 6dB EVM sensitivity enhancement can be achieved compared w... 详细信息

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

关键词： Wireless communication Wireless sensor networks Sensitivity OFDM Symbols optical fiber communication Reliability

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MZM Nonlinearity Enabled Uneven PAM-4 for EVM Reduction in Digital Mobile Fronthaul 20

MZM Nonlinearity Enabled Uneven PAM-4 for EVM Reduction in D...

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20th International Conference on optical communications and networks, ICOCN 2022

作者： Li, Jiaji Chen, Xi Wu, Jiahao Zhu, Yixiao Hu, Weisheng Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Shanghai200240 China

We propose and experimentally demonstrate a digital mobile fronthaul scheme utilizing the non-linearity of MZM. The EVM can be reduced by 6.17% and 2.19% at-9dBm ROP for BtB and after 10km SSMF transmission, respectiv... 详细信息

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

关键词： Pulse amplitude modulation

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Generalized Carrier Assisted Differential Detection Receiver with Simplest Structure

Generalized Carrier Assisted Differential Detection Receiver...

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2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO/PR 2022

作者： Zhu, Yixiao Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

We propose a generalized carrier assisted differential detection receiver featuring simplest structure of 2×2 optical coupler and 2 single-ended photodiodes. The performance of the designed receiver is comprehens... 详细信息

关键词： Electronics industry

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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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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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Dispersion-Diverse Receiver for Power Fading Mitigation in IM-DD systems at C Band

Dispersion-Diverse Receiver for Power Fading Mitigation in I...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Jianyao Zhang Yixiao Zhu Xiansong Fang Yimin Hu Yikun Zhang Fan Zhang Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing China Pengcheng Laboratory Shenzhen China

We experimentally demonstrate a dispersion-diverse receiver to mitigate the CD-induced power fading for IM-DD systems at C-band. The receiver can support 256.5 Gb/s line-rate PS-64-QAM signal transmission over 10-km S... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Fading channels C-band Prevention and mitigation Asia Modulation Receivers Bandwidth optical fiber communication Dispersion Photonics

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Ultrahigh-coherence microcomb generation and low-noise amplification using integrated photonics

Ultrahigh-coherence microcomb generation and low-noise ampli...

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2024 IEEE Photonics Conference, IPC 2024

作者： Zhang, Xuguang Zhou, Zixuan Guo, Yijun Zhuang, Minxue Jin, Warren Shen, Bitao Chen, Yujun Huang, Jiahui Hu, Weiwei Shu, Haowen Bowers, John E. Wang, Xingjun Chang, Lin University of California Santa Barbara Department of Electrical and Computer Engineering Santa BarbaraCA United States Peking University State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Beijing China Peking University Frontiers Science Center for Nano-Optoelectronics Beijing China

ISBN: (纸本)9798350361957

We demonstrate a high-coherence parallel integrated light source utilizing a self-injection locked microcomb and injection locking amplification. Our strategy exhibits a record high on-chip gain of 60 dB, nearly 0 dB noise factor, which enable more than 30 highly coherent channels in integrated photonics whose linewidths down to 10 Hz, power exceeding 20 dBm per line and a wall plug efficiency of 19%. © 2024 IEEE.

关键词： Photonic integrated circuits

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Reconfigurable silicon integrated RF photonic filter toward wireless communication

Reconfigurable silicon integrated RF photonic filter toward ...

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International Topical Meeting on Microwave Photonics (MWP)

作者： Zihan Tao Yuansheng Tao Ming Jin Ruixuan Chen Haowen Shu Xingjun Wang State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing China

Integrated microwave photonic filters (IMPFs) are capable of offering unparalleled reconfigurability. However, to achieve high reconfigurability, complicated system structures and modulation formats are always required, which put great pressure on power consumption and controlment. Here, we propose a streamlined architecture for a wideband and highly reconfigurable IMPF on the silicon photonics platform. For various practical filter responses and avoiding complex auxiliary devices and bias drift problems, a phase-modulated flexible sideband cancellation method is employed based on the intensity-consistent single-stage-adjustable cascaded-microring (ICSSA-CM). The IMPF exhibits an operation band extends to mm-wave (≥ 30 GHz) and other extraordinary performances including high spectral resolution of 220 MHz and large rejection ratio of 60 dB are obtained. Moreover, Gbps-level RF wireless communications are demonstrated for the first time towards real-world scenarios.

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Correction Algorithm of Doppler Effect on the Comb-Based FSO-TWTFT for Satellite Application

Correction Algorithm of Doppler Effect on the Comb-Based FSO...

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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： Wang, Long Jiao, Wenhai Hu, Liang Chen, Jianping Wu, Guiling Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering China Beijing Institute of Tracking and Telecommunication Technology Beijing China

We further analyze the Doppler effect caused by high-velocity platform motion for the comb-based free-space optical two-way time-frequency transfer technique. A novel synchronization algorithm is proposed to correct t... 详细信息

ISBN: (纸本)9798350311426

关键词： Doppler effect optical frequency comb transfer satellite motion

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Experimental demonstration of a quantum downstream access network in continuous variable quantum key distribution with a local local oscillator

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Photonics Research 2024年第6期12卷 1262-1273页

作者： DENGKE QI XIANGYU WANG ZHENGHUA LI JIAYU MA ZIYANG CHEN YUEMING LU SONG YU State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Trustworthy Distributed Computing and Service(MoE) Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronicsand Center for Quantum Information TechnologyPeking UniversityBeijing 100871China

Quantum networks provide opportunities and challenges across a range of intellectual and technical frontiers,including quantum computation,communication,and *** traditional communication networks,quantum networks utilize quantum bits rather than classical bits to store and transmit *** key distribution(QKD)relying on the principles of quantum mechanics is a key component in quantum networks and enables two parties to produce a shared random secret key,thereby ensuring the security of data *** this work,we propose a cost-effective quantum downstream access network structure in which each user can get their corresponding key information through terminal *** on this structure,we demonstrate the first four-end-users quantum downstream access network in continuous variable QKD with a local local *** contrast to point-to-point continuous variable QKD,the network architecture reevaluates the security of each user and accounts for it accordingly,and each user has a lower tolerance for excess noise as the overall network expands with more ***,the feasibility of the experiment is based on the analysis of the theoretical model,noise analysis,and multiple techniques such as the particle filter and adaptive equalization algorithm used to suppress excess *** results show that each user can get a low level of excess noise and can achieve secret key rates of 546 kbps,535 kbps,522.5 kbps,and 512.5 kbps under a transmission distance of 10 km,respectively,with the finite-size block of 1×10~*** not only verifies the good performance but also provides the foundation for the future multi-user quantum downstream access networks.

关键词： quantum oscillator local

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