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Direct detection optical transmission systems employing Stokes vector Kramers Kronig transceivers

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Direct detection optical transmission systems employing Stok...

Signal Processing in Photonic communications, SPPCom 2018

作者： Hoang, Thang Zhuge, Q. Xing, Z. Sowailem, M. Morsy-Osman, M. Xiang, M. El-Fiky, E. Fan, S. Plant, D.V. Electrical and Computer Engineering Department McGill University 3480 University Street MontrealQCH3A 0E9 Canada State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Eletrical Engineering Department Alexandria University 21544 Egypt

We use a Stokes vector receiver to demonstrate polarization multiplexing Kramers Kronig detection signals. The impact of several parameters is discussed. 480-Gb/s capacity is achieved for 80 km of standard single mode... 详细信息

ISBN: (纸本)9781943580439

关键词： Light transmission

Analog-to-digital conversion revolutionized by deep learning

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arXiv 2018年

作者： Xu, Shaofu Zou, Xiuting Ma, Bowen Chen, Jianping Yu, Lei Zou, Weiwen State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

As the bridge between the analog world and digital computers, analog-to-digital converters are generally used in modern information systems such as radar, surveillance, and communications. For the configuration of analog-to-digital converters in future high-frequency broadband systems, we introduce a revolutionary architecture that adopts deep learning technology to overcome tradeoffs between bandwidth, sampling rate, and accuracy. A photonic front-end provides broadband capability for direct sampling and speed multiplication. Trained deep neural networks learn the patterns of system defects, maintaining high accuracy of quantized data in a succinct and adaptive manner. Based on numerical and experimental demonstrations, we show that the proposed architecture outperforms state-of-the-art analog-to-digital converters, confirming the potential of our approach in future analog-to-digital converter design and performance enhancement of future information systems. Copyright © 2018, The Authors. All rights reserved.

关键词： Analog to digital conversion

A 420nm Blue Diode Laser for the Potential Rubidium optical Frequency Standard

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Chinese Physics Letters 2017年第7期34卷 118-121页

作者：张盛楠张晓刚涂建辉蒋招杰商浩森祝传文杨炜崔敬忠陈景标 State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering and Computer Science Peking University National Key Laboratory of Science and Technology on Vacuum Technology & Physics Lanzhou Institute of PhysicsChina Academy of Space Technology

We report a 42Ohm external cavity diode laser with an interference filter （IF） of 0.5am narrow-bandwidth and 79% high transmission, which is first used for Rb optical frequency standard. The IF and the cat-eye reflector are used for selecting wavelength and light feedback, respectively. The measured laser linewidth is 24 kHz when the diode laser is free running. Using this narrow-linewidth IF blue diode laser, we realize a compact Rb optical frequency standard without a complicated PDH system. The preliminary stability of the Rb optical frequency standard is 2 × 10^-13 at I s and decreases to 1.9 ×10^-14 at 1000s. The narrow-linewidth characteristic makes the IF blue diode laser a well suited candidate for the compact Rb optical frequency standard.

关键词： A 420nm Blue Diode Laser for the Potential Rubidium optical Frequency Standard Rb kHz

K-means clustering based multi-dimensional quantization scheme for digital mobile fronthaul

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K-means clustering based multi-dimensional quantization sche...

optical Fiber communication Conference, OFC 2018

作者： Zhang, Lu Pang, Xiaodan Ozolins, Oskars Udalcovs, Aleksejs Popov, Sergei Xiao, Shilin Chen, Jiajia KTH Royal Institute of Technology Sweden State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University China Networking and Transmission Laboratory RISE Acreo AB Sweden

We propose to group highly-correlated neighboring samples into multi-dimensional vectors and adopt k-means clustering for quantization in mobile fronthaul. 30-Gbit/s transmissions have been experimentally demonstrated... 详细信息

ISBN: (纸本)9781943580385

关键词： K-means clustering

A single photonic cavity with two independent physical synthetic dimensions

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arXiv 2019年

作者： Dutt, Avik Lin, Qian Yuan, Luqi Minkov, Momchil Xiao, Meng Fan, Shanhui Ginzton Laboratory Department of Electrical Engineering Stanford University Stanford CA94305 United States Department of Applied Physics Stanford University Stanford CA94305 United States State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of Artificial Micro- and Nano-structures Ministry of Education School of Physics and Technology Wuhan University Wuhan430072 China

The concept of synthetic dimensions, which has enabled the study of higher-dimensional physics on lower-dimensional physical structures, has generated significant recent interest in many branches of science ranging from ultracold-atomic physics to photonics, since such a concept provides a versatile platform for realizing effective gauge potentials and novel topological physics. Previous experiments demonstrating this concept have augmented the real-space dimensionality by one additional physical synthetic dimension. Here we endow a single ring resonator with two independent physical synthetic dimensions. Our system consists of a temporally modulated ring resonator with spatial coupling between the clockwise and counterclockwise modes, creating a synthetic Hall ladder along the frequency and pseudospin degrees of freedom for photons propagating in the ring. We experimentally observe a wide variety of rich physics, including effective spin-orbit coupling, magnetic fields, spin-momentum locking, a Meissner-to-vortex phase transition, and chiral currents, completely in synthetic dimensions. Our experiments demonstrate that higher-dimensional physics can be studied in simple systems by leveraging the concept of multiple simultaneous synthetic dimensions. Copyright © 2019, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

Programmable and fast-switchable passively harmonic mode-locking fiber laser

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Programmable and fast-switchable passively harmonic mode-loc...

optical Fiber communication Conference, OFC 2018

作者： Pu, Guoqing Yi, Lilin Zhang, Li Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Electronic Engineering Shanghai200240 China

Programmable harmonic mode-locking are achieved in graphene-based mode-locking fiber laser enabled by mode-locking discrimination algorithm and fast polarization tuning. Fundamental, second-order and third-order harmo... 详细信息

ISBN: (纸本)9781943580385

关键词： Fiber lasers

Beyond Fourier transform: Break the axial resolution limit in optical coherence tomography

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arXiv 2020年

作者： Ling, Yuye Wang, Mengyuan Gan, Yu Yao, Xinwen Schmetterer, Leopold Zhou, Chuanqing Su, Yikai John Hopcroft Center for Computer Science Shanghai Jiao Tong University Shanghai China Department of Electrical and Computer Engineering University of Alabama AL United States Singapore Institute for Health Technologies Nanyang Technological University Singapore Singapore Eye Research Institute Singapore National Eye Centre Singapore School of Chemical and Biomedical Engineering Nanyang Technological University Singapore Institute of Biomedical Engineering Shenzhen Bay Lab Shenzhen China School of Biomedical Engineering Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

optical coherence tomography (OCT) is a volumetric imaging modality that empowers clinicians and scientists to noninvasively visualize and examine the microscopic cross-sectional architectures of biological samples. By taking advantage of the coherence gating, OCT could achieve micrometer-level axial sectioning with high sensitivity. In the past decade, substantial efforts have been made to push the axial resolution of Fourier-domain OCT (FD-OCT) further into the sub-micron regime by physically extending the system's spectral bandwidth. Here, we offer a new perspective on this problem with the help of a new theoretical framework. We identified a key limitation on the reconstruction's axial resolution, which is induced by the Fourier transform-based reconstruction algorithm. To break this limit, we presented a novel optimization-based algorithm to recover the super-resolution image from ordinary FD-OCT measurements with proper physical assumptions. To prove the concept, we retrieved images at a resolution higher than the theoretical prediction in both phantoms and biological samples. Copyright © 2020, The Authors. All rights reserved.

关键词： optical tomography

Silicon-graphene hybrid slot waveguide with enhanced four-wave mixing efficiency

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Silicon-graphene hybrid slot waveguide with enhanced four-wa...

optical Fiber communication Conference, OFC 2018

作者： Yang, Yuxing Jiang, Xinhong Xu, Zhenzhen Zhang, Yong Qiu, Ciyuan Guo, Xuhan Su, Yikai State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

An enhanced four-wave mixing in a silicon-graphene hybrid slot waveguide is proposed and experimentally demonstrated. The conversion efficiency is -48.8 dB, showing 3.2-dB and 0.5-dB improvements relative to silicon s... 详细信息

ISBN: (纸本)9781943580385

关键词： Four wave mixing

Photon retention in coherently excited nitrogen ions

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arXiv 2020年

作者： Yao, Jinping Wang, Luojia Chen, Jinming Wan, Yuexin Zhang, Zhihao Zhang, Fangbo Qiao, Lingling Yu, Shupeng Fu, Botao Zhao, Zengxiu Wu, Chengyin Yakovlev, Vladislav V. Yuan, Luqi Chen, Xianfeng Cheng, Ya Shanghai201800 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China University of Chinese Academy of Sciences Beijing100049 China School of Physical Science and Technology ShanghaiTech University Shanghai200031 China Department of Physics National University of Defense Technology Changsha410073 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China Texas A&M University College StationTX77843 United States Shanghai Research Center for Quantum Sciences Shanghai201315 China Jinan Institute of Quantum Technology Jinan250101 China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan250358 China Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

Quantum coherence in quantum optics is an essential part of optical information processing and light manipulation. Alkali metal vapors, despite the numerous shortcomings, are traditionally used in quantum optics as a working medium due to convenient near-infrared excitation, strong dipole transitions and long-lived coherence. Here, we proposed and experimentally demonstrated photon retention and subsequent re-emittance with the quantum coherence in a system of coherently excited molecular nitrogen ions (N+2) which are produced using a strong 800 nm femtosecond laser pulse. Such photon retention, facilitated by quantum coherence, keeps releasing directly-unmeasurable coherent photons for tens of picoseconds, but is able to be read-out by a time-delayed femtosecond pulse centered at 1580 nm via two-photon resonant absorption, resulting in a strong radiation at 329.3 nm. We reveal a pivotal role of the excited-state population to transmit such extremely weak re-emitted photons in this system. This new finding unveils the nature of the coherent quantum control in N+2 for the potential platform for optical information storage in the remote atmosphere, and facilitates further exploration of fundamental interactions in the quantum optical platform with strong-field ionized molecules. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons