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Laser Frequency-Offset Locking over a 1577 km Fiber Link Based on LSTM Neural Network

Laser Frequency-Offset Locking over a 1577 km Fiber Link Bas...

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

作者： Zhu, Mingwen Ding, Shangsu Wu, Chenglong Shang, Jianming Yu, Song Luo, Bin Guo, Hong Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Beijing100871 China

ISBN: (纸本)9798350311426

We demonstrated a digital frequency offset locking system based on long short-term memory (LSTM) neural network and locked two free-running lasers at 1550.12 nm with 291.25 MHz offset after transferring through a 1577 km fiber link. Within 1.63 hours of locking, the root-mean-square (RMS) error of frequency offset is 47.1592 kHz. Compared to traditional digital locking systems using proportional-integral-derivative (PID) control, our locking system can effectively resist frequency offset drifting between lasers caused by temperature variation and requires no complicated parameter tuning process. © 2023 IEEE.

关键词： fiber link frequency offset locking system LSTM neural network transferring

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Compact 2.4 GHz Microwave Generation system Based on an Ultralow Noise Femtosecond Laser

Compact 2.4 GHz Microwave Generation System Based on an Ultr...

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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, Ya Yang, Ruoao Chen, Zhendong Pan, Duo Luo, Bin Zhang, Zhigang Chen, Jingbiao Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Beijing100871 China

ISBN: (纸本)9798350311426

communication systems with high timing precision require microwave signals with ultra-low phase noise. In this work, we establish a compact and convenient 2.4 GHz microwave generation system based on the transfer oscillator technique for optical frequency division via a low-SWaP 1-GHz solid-state fiber laser and a 657 nm narrow linewidth laser. High SNR (> 30 dB) of carrier envelop offset frequency and beat note between two lasers are obtained via the octave spectrum without amplification. © 2023 IEEE.

关键词： fiber laser high repetition rate low-SWaP non-amplification Photonically generated microwave ultra-low noise

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DAC-Free 4096-QAM OFDM Transmission Employing 2-Bit Low-OSR Delta-Sigma Modulation and Dual-Drive MZM 27

DAC-Free 4096-QAM OFDM Transmission Employing 2-Bit Low-OSR ...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

作者： Li, Jiaji Zhu, Yixiao Hu, Weisheng Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks 800 Dongchuan Rd Shanghai200240 China

We propose and experimentally demonstrate DAC-free 4096-QAM OFDM transmission based on 2-bit delta-sigma modulator and MSB/LSB separation with DDMZM. 9 × 100MHz signals can be transmitted over 10km SSMF at 8 OSR ... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Delta sigma modulation

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Analysis of the Asymmetry of Erbium-Doped Fiber Length in Fiber RF Transmission

Analysis of the Asymmetry of Erbium-Doped Fiber Length in Fi...

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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： Lu, Jinze Gao, Hao Zhao, Zhuoze Cheng, Jiahui Luo, Bin Yu, Song Guo, Hong Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Beijing100871 China

ISBN: (纸本)9798350311426

Bidirectional erbium-doped fiber amplifiers(Bi-EDFAs) are needed for optical amplification in long distance fiber frequency transmission. Erbium-doped fiber is used in optical amplifiers. With the increase of the asymmetric length of erbium-doped fiber, the transmission stability of the system will be deteriorated. We built a simulation platform for fiber frequency transmission, and set erbium fiber with different lengths based on it to observe its influence on frequency stability. The results show that the stability of the system decreases obviously with the increase of the asymmetric length of the Erbium fiber. © 2023 IEEE.

关键词： EDFA frequency transmission system simulation

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Simulation of Residual Dispersion on Stability of optical Fiber Frequency Transfer system

Simulation of Residual Dispersion on Stability of Optical Fi...

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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： Gao, Hao Zhao, Zhuoze Cheng, Jiahui Luo, Bin Yu, Song Guo, Hong Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Beijing100871 China

ISBN: (纸本)9798350311426

Residual dispersion is a key factor affecting the stability of fiber optic frequency transfer system. For long-distance stable frequency transfer, dispersion compensation fiber (DCF) is used to compensate for the dispersion of the fiber link. We simulate a frequency transmission system with different dispersion compensation over a transmission distance of 500 km. The results show a significant increase in frequency stability with decreasing residual dispersion. Compared to dispersion-free compensation, the stability can be improved by two orders of magnitude when dispersion compensation reaches 100%. © 2023 IEEE.

关键词： frequency transfer residual dispersion system stability

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Efficient SNR Scaling at >10dB per Extra Bandwidth Using Cascaded Hybrid Digital-Analog Radio-over-Fiber for Fronthaul 27

Efficient SNR Scaling at >10dB per Extra Bandwidth Using Cas...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

作者： Zhu, Yixiao Zhuge, Qunbi Hu, Weisheng Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks 800 Dongchuan Rd Shanghai200240 China

We present bandwidth-efficient cascaded hybrid digital-analog radio-over-fiber scheme exhibiting >10dB SNR enhancement per linearly increased bandwidth. Up to 70.8dB SNR is achieved after 20km SSMF using O-band DML... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Bandwidth

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10 λ ×3.26Tb/s CPRI-Equivalent Rate 1024-QAM DA-RoF Fronthaul in Single-Mode Fiber Using Coherent-Compliant DSP

10 λ ×3.26Tb/s CPRI-Equivalent Rate 1024-QAM DA-RoF Fronth...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yixiao Zhu Xiansong Fang Chenbo Zhang Lingjun Zhou Jiayu Zheng Yicheng Xu Xiaopeng Xie Fan Zhang Qunbi Zhuge 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

We experimentally demonstrate high-capacity coherent DA-RoF fronthaul leveraging pilot symbol- and BPS-based carrier phase recovery. Up to 4.42- This and 32.6- This CPRI-equivalent rates are achieved with single-carri...

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High-Capacity Digital-Analog Fronthaul via Self-Homo Dyne Detection

High-Capacity Digital-Analog Fronthaul via Self-Homo Dyne De...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Yixiao Zhu Chenbo Zhang Yicheng Xu Qunbi Zhuge Xiaopeng Xie Wei sheng 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

We overview the recent progress of high-capacity mobile fronthaul based on digital-analog radio-over-fiber and self-homodyne coherent detection. The principle, architecture, and perspectives are discussed.

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Thermal engineering in ALD-grown ZGO thin films for high-performance photodetectors

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材料科学技术（英文版） 2025年第6期209卷 19-26页

作者： Si-Tong Ding Yu-Chang Chen Cai-Yu Shi Lei Shen Qiu-Jun Yu Lang-Xi Ou Ze-Yu Gu Na Chen Ting-Yun Wang David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics & SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Zhangjiang Fudan International Innovation Center Shanghai 201203China National Integrated Circuit Innovation Center Shanghai 201203China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute Communication and Data ScienceShanghai UniversityShanghai 200444China State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics & SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Zhangjiang Fudan International Innovation Center Shanghai 201203China National Integrated Circuit Innovation Center Shanghai 201203China Jiashan Fudan Institute Jiaxing 314100China

Doped gallium oxide-based thin films are a class of wide-band semiconductor materials with the ad-vantages of chemically stable,tunable bandgap,and offer the benefit of ultraviolet *** order to obtain photodetectors(PDs)with superior response,higher demands are placed on the quality of growth and processing of doped *** this work,Zn-doped ternary metal oxide ZnGaO(ZGO)thin films were grown using the atomic layer deposition technique and annealed at different temperatures under an oxy-gen *** results showed that the high-quality ZGO films with good uniformity,high visible light transmittance,low roughness,and significant reduction of oxygen vacancies were obtained after ***,metal-semiconductor-metal PDs were prepared based on the studied ZGO *** responsivity(R),detectivity(D*),and external quantum efficiency(EQE)of the optimized device are 61.8 A W-1,1.2 x 1012 Jones,and 255.9％,*** to the unannealed device,the an-nealed ZGO PD achieves a maximum 309-fold increase in *** thermal engineering work may provide a strong reference for the development of low-cost,large-area,high-performance ultraviolet *** it also broadens the application of ternary metal oxides in optoelectronics.

关键词： Atomic layer deposition Oxygen annealing ZGO thin films Photodetector Ultraviolet detection

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Calibration of Fiber-Optic Time Synchronization system over 800km

Calibration of Fiber-Optic Time Synchronization System over ...

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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： Dong, Jiameng Wang, Zhaohui Zhang, Rui Yu, Song Luo, Bin Guo, Hong School of Electronic Engineering State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Electronics Center for Quantum Information Technology Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing China

ISBN: (纸本)9798350311426

Due to the excellent performance in accuracy and stability, fiber-optic time synchronization is becoming a key technology in the field of time-frequency metrology. And the accuracy of fiber-optic time synchronization system mainly depends on asymmetry calibration. Here we study the calibration of time synchronization system over 800km laboratory fiber link. Asymmetry caused by chromatic dispersion, bidirectional EDFAs, sending and receiving devices are investigated. After calibration, the residual of clock difference between two sites is 56.80ps, and the timing jitter is 33.91ps. By further optimizing the whole system and the method of calibration, a system with accuracy better than 50ps over thousands of kilometers fiber link is expected to be obtained in the future. © 2023 IEEE.

关键词： accuracy asymmetry calibration fiber link time synchronization system

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