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Conference on Lasers and Electro-Optics (CLEO)

作者： Jiarui Zhang Junchi Jia Gang Qiao Ruiting Cheng Mingqing Zuo Zhangyuan Chen Yongqi He Juhao Li State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China Peng Cheng Laboratory Shenzhen China

We propose a transverse force sensing scheme for large-scale array applications based on linearly-polarized mode coupling in few-mode fibers, and experimentally demonstrate the feasibility for human sleeping postures ... 详细信息

ISBN: (纸本)9781957171258

关键词： Analog to digital converters Few mode fibers Modal crosstalk Polarization maintaining fibers Signal processing Spatial resolution

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High extinction ratio, low loss and broadband on-chip TE-pass polarizer for optical gyroscope

High extinction ratio, low loss and broadband on-chip TE-pas...

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2021 International Conference on optical Instruments and Technology - Micro/Nano Photonics: Materials and Devices

作者： Tao, Zihan Wang, Xingjun State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Frontier Science Center for Nanooptoelectronics Peking University Beijing100871 China

ISBN: (纸本)9781510655713

optical gyroscope is an important high-precision inertial measurement instrument, which plays significant role in defense, geological exploration and navigation. For high accuracy optical gyroscope system, a high-performance polarizer is strongly needed to filter only one polarization from Amplified Spontaneous Emission (ASE) source. Here, the plasmon-assisted structure is introduced by setting a thin metal layer above the silicon nitride (Si3N4) waveguide. The copper (Cu) is chosen as the metal layer material as it is compatible with the complementary metal-oxide-semiconductor (CMOS) fabrication process. The surface plasmons effect can simply be excited by TM polarization due to the electric field of TM polarization perpendicular to the metal layer, so that it can bring extra propagation loss. The TE polarization, on the contrary, fail to excite the surface plasmons effect as the electric field is parallel to the metal layer. To reduce the reflection caused by mode mismatch, the distance between metal layer and waveguide is increased by inserting a SiO2 layer. The chemical mechanical planarization (CMP) process allows precise thickness control of the SiO2 layer. The spiral waveguide structure is utilized to fully suppress TM polarization while the TE polarization can be well confined in broadened Si3N4 core with negligible propagation loss. The numerical results show that the working wavelength range is as large as 60 nm from 820 nm to 880 nm with the polarization extinction ratio > 30 dB and the insert loss © 2022 SPIE.

关键词： Silica

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783-MHz fundamental repetition rate CNT mode-locked all Er-doped fiber ring laser

783-MHz fundamental repetition rate CNT mode-locked all Er-d...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Dai, Maolin Liu, Bowen Ma, Yifan Shirahata, Takuma Yang, Ruoao Zhang, Zhigang Set, Sze Yun Yamashita, Shinji Department of Electrical Engineering and Information Systems The University of Tokyo Bunkyo-ku Tokyo113-8656 Japan Research Center for Advanced Science and Technology The University of Tokyo Meguro-ku Tokyo153-8904 Japan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

We realize 783-MHz fundamental repetition rate in a carbon-nanotubes (CNT) modelocked Er-doped fiber ring laser with all active fibers. The proposed laser self-starts mode-locking at 108-mW pump power and delivers 623... 详细信息

ISBN: (纸本)9781957171395

关键词： Laser excitation

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Directivity-Aware Degrees of Freedom Analysis for Extremely Large-Scale MIMO

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IEEE Transactions on Vehicular Technology 2025年

作者： Yue, Shaohua Liu, Liang Di, Boya The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China The Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong

Extremely large-scale multiple-input multiple-output (XL-MIMO) communications, enabled by numerous antenna elements integrated into large antenna surfaces, can provide increased effective degree of freedom (EDoF) to achieve high diversity gain. However, it remains an open problem that how the EDoF is influenced by the directional radiation pattern of antenna elements. In this work, empowered by the wavenumber-domain channel representation, we analyze the EDoF in a general case where the directivity of antennas, determined by the antenna structure and element spacing, is considered. Specifically, we first reveal the uneven distribution of directivity-aware wavenumber-domain coupling coefficients, i.e., channel gain towards different directions, in the isotropic Rayleigh fading channel. EDoF is then calculated based on such distribution of coupling coefficients. A numerical method is also provided to obtain coupling coefficients via full-wave EM simulations. Due to the influence of antenna directivity, how EDoF and ergodic channel capacity vary with the element spacing are explored via simulations for different antenna types. © 1967-2012 IEEE.

关键词： Degrees of freedom (mechanics)

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Compact 459-nm Cs Cell optical Frequency Standard with 2.1×10−13/τ Short-Term Stability

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Physical Review Applied 2022年第2期18卷 024034-024034页

作者： Jianxiang Miao Tiantian Shi Jia Zhang Jingbiao Chen State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Peking University Beijing 100871 China

We achieve a compact optical frequency standard with an extended cavity diode laser locked to the 459-nm 6S1/2-7P1/2 transition of thermal 133Cs atoms in a ϕ10mm×50mm glass cell, using modulation transfer spectroscopy (MTS). The self-estimated frequency stability of this laser is 1.4×10−14/τ. With heterodyne measurement, we verify the linewidth-narrowing effect of MTS locking and measure the frequency stability of the locked laser. The linewidth of each laser is reduced from the free-running 69.6 to 10.3 kHz after MTS stabilization, by a factor of 6.75. The Allan deviation measured via beat detection is 2.1×10−13/τ for each MTS-stabilized laser. In addition, we measure the hyperfine structure of the 7P1/2 energy level based on the heterodyne measurements, and calculate the magnetic dipole constant A of the Cs 7P1/2 level to be 94.38(6) MHz, which agrees well with previous measurements. This compact optical frequency standard can also be used in other applications that require high-stability lasers, such as laser interferometry, laser cooling, geodesy, and so on.

关键词： Atomic, optical & lattice clocks Time & frequency standards Diode lasers

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Analysis of Spiral Scanning Amplitude Modulation Methods for Two-photon Endomicroscopy 10

Analysis of Spiral Scanning Amplitude Modulation Methods for...

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10th Symposium on Novel Optoelectronic Detection Technology and Applications

作者： Cui, Haodong Wang, Conghao Liu, Huilan Zhang, Xiulei Hu, Yanhui Fu, Qiang Wu, Runlong Wang, Aimin Feng, Lishuang School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Beijing Transcend Vivoscope Biotech Co. Ltd. Beijing100049 China Beijing Key Laboratory for Optoelectronics Measurement Technology Beijing Information Science and Technology University Beijing100192 China State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronics Peking University Beijing100871 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Two-photon endomicroscopy is a high-resolution label-free imaging technique for biological tissues. This paper analyzes sinusoidal and triangular amplitude modulation methods for spiral scanning two-photon endomicroscopy. In the theoretical modeling section, the mathematical model of PZT fiber scanner is established, and the distortion of fiber scanning trajectory caused by two amplitude modulated sine wave signals is simulated and evaluated. In the experimental verification section, a test platform is constructed to measure the scanning trajectory distortion driven by these amplitude modulated sine wave signals. Finaly, spiral scanning two-photon endomicroscopic imaging of in-vivo GFP mice brain tissues using sinusoidal amplitude modulated signals are demonstrated. © 2025 SPIE.

关键词： Amplitude modulation

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Transport of ultracold atoms in superpositions of S- and D-band states in a moving optical lattice

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Physical Review A 2023年第2期107卷 023303-023303页

作者： Zhongcheng Yu Jinyuan Tian Peng Peng Dekai Mao Xuzong Chen Xiaoji Zhou State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Peking University Beijing 100871 China Institute of Advanced Functional Materials and Devices Shanxi University Taiyuan 030031 China

Ultracold atoms in a moving optical lattice with high controllability are a feasible platform to research the transport phenomenon. Here, we study the transport process of ultracold atoms at the D band in a one-dimensional optical lattice and manipulate the transport of superposition states with different superposition weights of S-band and D-band atoms. In the experiment, we first load ultracold atoms into an optical lattice using the shortcut method and then accelerate the optical lattice by scanning the phase of lattice beams. The atomic transport at the D band and S band is demonstrated, respectively. The group velocity of atoms at the D band is opposite to that at the S band. By preparing superposition states with different superposition weights of the D-band and S-band atoms, we realize the manipulation of atomic group velocity from positive to negative, and observe the quantum interference between atoms at different bands. The influence of the lattice depth and acceleration on the transport process is also studied. Moreover, the multiorbital simulations are coincident with the experimental results. Our paper sheds light on the transport process of ultracold atoms at higher bands in optical lattices and provides a useful method to manipulate the transport of atomic superposition states.

关键词： optical lattices & traps Transport phenomena 1-dimensional systems Bose-Einstein condensates

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Extreme single-excitation subradiance from two-band Bloch oscillations in atomic arrays

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Photonics Research 2024年第3期12卷 571-580页

作者： LUOJIA WANG DA-WEI WANG LUQI YUAN YAPING YANG XIANFENG CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Interdisciplinary Center for Quantum Information and State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Deviceand School of PhysicsZhejiang UniversityHangzhou 310027China MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Atomic arrays provide an important quantum optical platform with photon-mediated dipole–dipole interactions that can be engineered to realize key applications in quantum information processing.A major obstacle for such applications is the fast decay of the excited *** controlling two-band Bloch oscillations of single excitation in an atomic array under an external magnetic field,here we show that exotic subradiance can be realized and maintained with orders of magnitude longer than the spontaneous decay time in atomic arrays with the finite *** key finding is to show a way for preventing the wavepacket of excited states scattering into the dissipative zone inside the free space light cone,which therefore leads to the excitation staying at a subradiant state for an extremely long decay *** show that such operation can be achieved by introducing a spatially linear potential from the external magnetic field in the atomic arrays and then manipulating interconnected two-band Bloch oscillations along opposite *** results also point out the possibility of controllable switching between superradiant and subradiant states,which leads to potential applications in quantum storage.

关键词： excitation Bloch decay

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Broadband and repetition rate tunable frequency comb based on electro-optic time lens with AlGaAsOl waveguide 49

Broadband and repetition rate tunable frequency comb based o...

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49th European Conference on optical communications, ECOC 2023

作者： Ma, Chunyang Wang, Chaopeng Pi, Yazhi Wang, Lei He, Zhixue Bowers, John E. Chnag, Lin Zizheng Cao, Lin Yu, Shaohua Research Center of Circuits and Systems Peng Cheng Laboratory Guangdong Shenzhen518055 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States State Key Laboratory of Advanced Optical Communications System and Networks Peking University Beijing100871 China

ISBN: (纸本)9781839539954

We present a tunable repetition rate frequency comb realized by cascaded electro-optical modulators with a high nonlinear AlGaAs-on-isolator waveguide. 18-26.5 GHz comb spacing tunability with broadband spectra was achieved. All the devices can be integrated onto a single chip, which makes this work useful for many applications. © The Institution of Engineering & Technology 2023.

关键词： Aluminum gallium arsenide

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A Dynamic Computing Power Scheduling Scheme for the EDWC Project in China 22

A Dynamic Computing Power Scheduling Scheme for the EDWC Pro...

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22nd International Conference on optical communications and networks, ICOCN 2024

作者： Hong, Zhixiang Lin, Xiao Wu, Guiping Zhang, Jia Li, Jun Chen, Zhen Sun, Weiqiang Lou, Zhilan College of Physics and Information Engineering Fuzhou University Fuzhou China School of Electronic and Information Engineering Soochow University Suzhou China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai China School of Data Sciences Zhejiang University of Finance and Economics Hangzhou China

In this paper, we conduct the cost analysis of the EDWC project. Studies show the current transmission cost is too high. We present a scheme to schedule the computing jobs based on the price fluctuation. © 2024 I... 详细信息

ISBN: (纸本)9798350367652

关键词： Computing power

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