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External Cavity Laser for Chip-Scale Atomic Clock

External Cavity Laser for Chip-Scale Atomic Clock

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

作者： Miao, Jie Lian, Jiqing Liu, Tianyu Pan, Duo Chen, Jingbiao Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Beijing100871 China Xidian University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Mechano-Electronic Engineering Xi'an710071 China Lanzhou Institute of Physics State Key Laboratory of Advanced Optical Communication Systems and Networks Lanzhou730000 China

ISBN: (纸本)9798350311426

In this paper we report a new coherent population trapping (CPT) atomic clock based on external cavity laser. Unlike usual CPT atomic clocks, where used the vertical cavity surface emitting laser (VCSEL), we combine the external cavity laser (ECL) with CPT atomic clock to improve the stability. Compared with VCSEL, the ECL has higher laser power of 10 mW and narrower linewidth of 0.8 MHz, meaning that the signal-to-noise ratio of clock can be further improved. © 2023 IEEE.

关键词： atomic clock chip scale CPT ECL

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Chip-Scale optical Clock Scheme Based on Dual-Wavelength Modulation Transfer Spectroscopy

Chip-Scale Optical Clock Scheme Based on Dual-Wavelength Mod...

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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： Miao, Jie Yang, Qiaohui Lian, Jiqing Liu, Tianyu Pan, Duo Chen, Jingbiao Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Beijing100871 China Xidian University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Mechano-Electronic Engineering Xi'an710071 China Lanzhou Institute of Physics State Key Laboratory of Advanced Optical Communication Systems and Networks Lanzhou730000 China

ISBN: (纸本)9798350311426

In this paper we propose a new scheme to realize the chip-scale optical clock by using a dual-wavelength modulation transfer spectroscopy (DWMTS). The electro-optical modulator (EOM) and isolator in conventional modulation transfer spectroscopy which is complicated to be built on chip can thus be avoided. We remove the EOM and isolator at the price of an extra laser, which perform the volume optimization of the entire optical system, making the optical clock based on DWMTS to be a competitive candidate. © 2023 IEEE.

关键词： chip-scale frequency stability modulation transfer spectrum optical clock

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One-bit quantization is good for programmable coding metasurfaces

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Science China(Information Sciences) 2022年第7期65卷 225-239页

作者： Ya SHUANG Hanting ZHAO Menglin WEI Qiang CHENG Shi JIN Tiejun CUI Philipp DEL HOUGNE Lianlin LI State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking University Institute of Electromagnetic Space Southeast University State Key Laboratory of Millimeter Waves Southeast University Pazhou Laboratory University of Rennes

The information-carrying programmable metasurfaces have found widespread applications in communication, sensing, and other related areas. However, there is a fundamental but unresolved problem,i.e., the rigorous understanding of the quantization of metasurface coding. Here, we theoretically investigate the performance difference between one-bit and continuous information-encoding metasurfaces. To this end,we derive analytical representations of system responses in various cases(single-input single-output, singleinput multiple-output, and multiple-input multiple-output). We analyze the impact of one-bit coding(in contrast to continuous coding) in terms of the resulting channel cross-talk and reduction of information capacity in various representative scenarios from wireless communication and holography. Our main finding indicates that the one-bit coding yields a satisfactory performance in most practical scenarios; we also show that in many cases there are smart ways to mildly relax optimization constraints in order to reduce the performance gap between the one-bit and continuous coding. We expect that our results can provide theoretical guidance for a large variety of metasurface-assisted information systems for electromagnetic waves and other wave phenomena.

关键词： metasurfaces metamaterials information capacity signal representation one-bit coding meta-surface

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Near-zero-dispersion soliton and broadband modulational instability Kerr microcombs in anomalous dispersion

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Light(Science & Applications) 2023年第2期12卷 220-231页

作者： Zeyu Xiao Tieying Li Minglu Cai Hongyi Zhang Yi Huang Chao Li Baicheng Yao Kan Wu Jianping Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronic Information and Electrical EngineeringDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Optical Fibre Sensing and Communications(Education Ministry of China) University of Electronic Science and Technology of ChinaChengdu 611731China

The developing advances of microresonator-based Ker cavity solitons have enabled versatile applications ranging from communication,signal processing to high-precision *** dispersion is the key factor determining the Kerr comb *** the zero group-velocity-dispersion(GVD)regime,low-noise and broadband microcomb sources are achievable,which is crucial to the application of the Kerr *** the GVD is almost vanished,higher-order dispersion can significantly affect the Kerr comb *** many studies have investigated the Kerr comb dynamics near the zero-dispersion regime in microresonator or fiber ring system,limited by dispersion profles and dispersion perturbations,the near-zero-dispersion soliton structure pumped in the anomalous dispersion side is still elusive so ***,we theoretically and experimentally investigate the microcomb dynamics in fiber-based Fabry-Perot microresonator with ultra-small anomalous *** obtain 2/3-octave-spaning microcombs with~10 GHz spacing,>84 THz span,and>8400 comb lines in the modulational instability(MI)state,without any external nonlinear spectral *** widely-spanned Ml combs are also able to enter the soliton ***,we report the first observation of anomalous-dispersion based near-zero-dispersion solitons,which exhibits a local repetition rate up to 8.6 THz,an individual pulse duration<100 fs,a span>32 THz and>3200 comb *** two distinct comb states have their own *** broadband MI combs possess high conversion efficiency and wide existing range,while the near-zero-dispersion soliton exhibits relatively low phase noise and ultra-high local repetition *** work complements the dynamics of Kerr cavity soliton near the zero-dispersion regime,and may stimulate cross-disciplinary inspirations ranging from dispersion-controlled microresonators to broadband coherent comb devices.

关键词： resonator dispersion pumped

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Integrated optical frequency transfer and optical physical layer key distribution with enhanced link reciprocity detection

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Science China(Information Sciences) 2024年第7期67卷 335-336页

作者： Kunfeng XIE Liang HU Jianping CHEN Guiling WU State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic EngineeringShanghai Jiao Tong University

optical fiber transmission has been widely used in communications and metrology, wherein optical frequency transfer (OFT) and optical physical layer secure key distribution (OKD) have become research hotspots [1, 2]. Moreover,OFT can perform a comparison between state-of-the-art optical atomic clocks and implement coherent optical phase transfer over long distances to support geodesy [1, 3].

关键词： distribution integrated physical detection layer link with enhanced frequency optical

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On the PMD Impact of Dual-Polarization Direct Detection with Jones-Space optical Field Recovery

On the PMD Impact of Dual-Polarization Direct Detection with...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Wu, Qi Zhu, Yixiao Jiang, Hexun Xu, Zhaopeng Ji, Honglin Yang, Yu Qiao, Gang Wang, Shangcheng Liu, Lulu Liang, Junpeng Wei, Jinlong Li, Jiali He, Zhixue Zhuge, Qunbi Hu, Weisheng Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering China Peng Cheng Laboratory Shenzhen China

ISBN: (纸本)9798350312614

We theoretically extend the concept of proposed Jones-space optical field recovery to the all-order polarization mode dispersion model for short-reach direct detection optical fiber communications. We numerically verify the impact of polarization mode dispersion can be mitigated using linear equalization as coherent detection systems with a 56-GBd dual-polarization QPSK, 16-QAM, and 64-QAM simulation. © 2023 IEEE.

关键词： Direct detection Jones-space optical field recovery polarization mode dispersion

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Brillouin random lasing resonance enabled fast light and superluminal propagation in optical fibers

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Optics Express 2025年第11期33卷 22497-22510页

作者： Xie, Haoran Xiao, Zhelan Liu, Zhiming Sheng, Liwen Zhan, Li Pang, Fufei Zhang, Liang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China Ceyear Technologies Co. Ltd. Qingdao266555 China Shandong Electronic Test & Measurement Technology Innovation Center Qingdao266555 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China

We proposed and demonstrated fast light and superluminal propagation based on Rayleigh scattering-induced Brillouin random lasing resonance in optical fibers. A theoretical model of the proposed Brillouin superluminal propagation system has been established, detailing the principle of optical group velocity manipulation based on the combination of stimulated Brillouin scattering and Brillouin cross-gain modulation, for the first time to the best of our knowledge. Thanks to the randomly distributed Rayleigh scattering, Brillouin random lasing resonance with a single-longitudinal-mode lasing operation essentially contributes to fast light and superluminal propagation of the pump light signals propagating along a kilometer-long optical fiber. The temporal advancement, group velocity, and group index of sinusoidally modulated pump signals are thoroughly compared in experiments, which agree well with simulations. The dependence of the Brillouin gain fibers on the group velocity as well as the impact of Stokes power under different signal modulation frequencies on the broadening factor are systematically discussed and characterized. Furthermore, the Brillouin random lasing fast-light system is developed to offer a unique time-domain analysis solution for high-sensitivity fiber Bragg grating (FBG) temperature sensing scheme. Scalable sensitivity of the proposed sensing system can be achieved by applying different modulation frequencies. These findings may find wide potential applications in optical signal processing and hyper-sensitive detection. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Stimulated Brillouin scattering

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405-GBd OOK and 201-GBd PAM-4 IM/DD Optics at Record Faster-Than-Nyquist Ratios of 226.6% and 62.1% Enabled by advanced Noise Whitening

405-GBd OOK and 201-GBd PAM-4 IM/DD Optics at Record Faster-...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Wu, Qi Xu, Zhaopeng Zhu, Yixiao Ji, Honglin Yang, Yu Liang, Junpeng Qiao, Gang Wang, Shangcheng Liu, Lulu Wei, Jinlong Zhuge, Qunbi Hu, Weisheng Peng Cheng Laboratory Shenzhen China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering China

ISBN: (纸本)9798350312614

We experimentally demonstrate 405-GBd OOK and 201-GBd PAM-4 signaling in an intensity modulation and direct detection system with a 62-GHz brick-wall bandwidth. Record faster-than-Nyquist ratios of 226.6% and 62.1% are successfully achieved for OOK and PAM-4 modulations, enabled by the proposed gradient-decent noise whitening technique. © 2023 IEEE.

关键词： faster-than-Nyquist IM-DD noise whitening OOK PAM-4

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Microresonator-referenced soliton microcombs with zeptosecond-level timing noise

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Nature Photonics 2025年第6期19卷 630-636页

作者： Jin, Xing Xie, Zhenyu Zhang, Xiangpeng Hou, Hanfei Wu, Bingyan Zhang, Fangxing Zhang, Xuanyi Chang, Lin Gong, Qihuang Yang, Qi-Fan State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Beijing China State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing China Peking University Yangtze Delta Institute of Optoelectronics Nantong China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan China

optical frequency division relies on optical frequency combs to translate ultrastable optical frequency references coherently to the microwave domain. This technology has enabled the synthesis of microwave signals with ultralow timing noise;however, the necessary instrumentation remains too bulky for practical applications. Recently, efforts have focused on leveraging microphotonic technologies to enhance system compactness. Here we develop an optical frequency division system using microresonator-based frequency references and comb generators. The soliton microcomb formed in an integrated Si3N4 microresonator is stabilized to two lasers referenced to an ultrahigh-quality-factor MgF2 microresonator. Photodetection of the soliton pulse train produces 25-GHz microwaves with an absolute phase noise of –141 dBc Hz–1 (546 zs Hz−1/2) at a 10-kHz offset frequency, which can be further referenced to an atomic clock for improved long-term stability. The synthesized microwave signals are evaluated as carrier waves in communication and radar applications, demonstrating enhanced fidelity and sensitivity against interference compared with those derived from electronic oscillators. Our work demonstrates unprecedented coherence in microphotonic microwave oscillators, providing key building blocks for next-generation timekeeping, navigation and satellite communication systems. © The Author(s), under exclusive licence to Springer Nature Limited 2025.

关键词： Microwave oscillators

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A SELF-ATTENTION ARMED LIGHTWEIGHT OPTRONIC CONVOLUTIONAL NEURAL NETWORK FOR SAR TARGET RECOGNITION

A SELF-ATTENTION ARMED LIGHTWEIGHT OPTRONIC CONVOLUTIONAL NE...

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IET International Radar Conference 2023, IRC 2023

作者： Huang, Zicheng Shi, Mengyang Chen, Yanru Gao, Yesheng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China

ISBN: (纸本)9781839539954

Deep learning has made significant progress in remote sensing and target recognition in recent decades. However, as a data-driven method, its development has encountered great challenges in computing speed and power consumption. Here, we propose a self-attention armed optronic neural network (SA-OPCNN) and realize the network in the optical platform for SAR target recognition. Based on the advantage of SA-OPCNN, all computation operations are executed in optics with ultra-fast speed, low computation cost, and low space complexity. Experiments on the Moving and Stationary Target Acquisition and Recognition (MSTAR) dataset demonstrate the feasibility and scalability of the proposed lightweight SAR target recognition method. © The Institution of Engineering & Technology 2023.

关键词： Convolutional neural networks

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