A5100365690- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Advanced Photonic Communication Systems
- Radio Frequency Integrated Circuit Design
- Advancements in PLL and VCO Technologies
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Solid State Laser Technologies
- Multilevel Inverters and Converters
- Advanced DC-DC Converters
- HVDC Systems and Fault Protection
- Analog and Mixed-Signal Circuit Design
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Silicon Carbide Semiconductor Technologies
- Advanced Optical Sensing Technologies
- Power Systems and Technologies
- Gyrotron and Vacuum Electronics Research
- High-Voltage Power Transmission Systems
- Power Systems and Renewable Energy
- Smart Grid and Power Systems
- Microwave Engineering and Waveguides
- Optical Systems and Laser Technology
Fujitsu (China)
2019-2025
Affiliated Hospital of Guizhou Medical University
2025
Guiyang Medical University
2025
City University of Hong Kong
2021-2024
Shanghai Maritime University
2024
Shanghai Institute of Technology
2024
City University of Hong Kong, Shenzhen Research Institute
2024
Weifang University
2024
Changchun University of Science and Technology
2024
South China University of Technology
2024
Lithium niobate on insulator (LNOI) is an emerging photonic platform with great promise for use in future optical communications, nonlinear optics, and microwave photonics. An important integrated building block, active waveguide amplifiers, however, are still missing the LNOI platform. Here, we report efficient compact amplifier based erbium-doped waveguides, achieved using a sequence of crystal growth, ion slicing, lithography-based fabrication. Using 5 mm long waveguide, demonstrate...
Abstract Integrated electro-optic (EO) frequency combs are essential components for future applications in optical communications, light detection and ranging, computation, sensing spectroscopy. To date, broadband on-chip EO typically generated high-quality-factor micro-resonators, while the more straightforward flexible non-resonant method, usually using single or cascaded phase modulators, often requires high driving power to realize a reasonably strong modulation index. Here, we show that...
Integrated lithium niobate (LN) photonics is a promising platform for future chip-scale microwave systems owing to its unique electro-optic properties, low optical loss and excellent scalability. A key enabler such highly linear modulator that could faithfully covert analog electrical signals into signals. In this work, we demonstrate monolithic integrated LN with an ultrahigh spurious-free dynamic range (SFDR) of 120.04 dB Hz4/5 at 1 GHz, using ring-assisted Mach-Zehnder interferometer...
On-chip optical microresonators are essential building blocks in integrated optics. The ability to arbitrarily engineer their resonant frequencies is crucial for exploring novel physics synthetic frequency dimensions and practical applications like nonlinear parametric processes dispersion-engineered comb generation. Photonic crystal ring (PhCR) resonators a versatile tool such arbitrary engineering, by controllably creating mode splitting at selected resonances. To date, these PhCRs have...
The development of high current-density cathodes employing scandia-doped tungsten powders is reviewed in this paper. A matrix with a submicrometer microstructure characterized by uniformly distributed nanometer particles scandia believed to play dominant role the improved emission capability these cathodes. Space-charge-limited current densities over 30 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 850 degC <sub...
Millimeter-wave (mmWave) band (30 - 300 GHz) is an emerging spectrum range for wireless communication, short-range radar and sensor applications. mmWave-optic modulators that could efficiently convert mmWave signals into optical domain are crucial components long-haul transmission of through networks. At these ultrahigh frequencies, however, the modulation performances highly sensitive to line loss as well velocity- impedance-matching conditions, while precise measurements modeling...
<sec> <title>BACKGROUND</title> The rapid advancement of digital technologies has profoundly transformed communication practices. However, this technological revolution also led to "digital isolation," a form social disconnection caused by limited or absent engagement with tools, including smartphones, computers, email, and the internet. This issue is particularly concerning for older adults, as it may increase their risk mental health disorders, depression. Although isolation been studied...
Leprosy is a neglected tropical disease, with approximately 200,000 new cases reported worldwide every year. Although there are numerous studies on the epidemiology of leprosy, age, period, and cohort effects remain poorly understood. We present an overview trends in leprosy incidence, prevalence disability-adjusted life years from 1990 to 2019 associations birth cohort. Data for analysis were obtained Global Burden Disease Study 2019. described incident case, prevalent age-standardised...
In this paper, a dual-task convolutional neural network based on the combination of U-Net and diffraction propagation model is proposed for design phase holograms to suppress speckle noise reconstructed images. By introducing Fresnel transmission layer, angular spectrum theory, as incorporating it into output can describe actual physical process holographic imaging, distributions both light amplitude be generated. Afterwards, by respectively using Pearson correlation coefficient (PCC) loss...
Combining machine learning techniques has shown great potentials in evolutionary optimization since the domain knowledge of an problem, if well learned, can be a help for creating high-quality solutions. However, existing learning-based multiobjective algorithms (MOEAs) spend too much computational overhead on learning. To address this we propose MOEA where online algorithm is embedded within search procedure. The takes stream sequentially generated solutions along evolution as its training...
Low propagation delay time is essential for SiC drivers at high frequency. The of the commercial parts normally over 100 ns. A signal isolation circuit and a level shifting are proposed applied in with minimum time. narrow edge signals input pulsewidth modulation (PWM) extracted by nondelay RC differential circuits control side demodulated an RS flip-flop drive so that only two low-profile transformers used low-delay isolation. two-stage isolated auxiliary power supply without linear...
High-Q lithium niobate (LN) optical micro-resonators are an excellent platform for future applications in communications, nonlinear optics, and quantum optics. To date, high-Q factors typically achieved LN using either dielectric masks or femtosecond laser ablation, while the more standard commonly available lift-off metallic often believed to lead rough sidewalls lowered Q factors. Here, we show that microring resonators with strong light confinement intrinsic over 1 million can be...
Abstract The construction of active materials with controllable optical response facilitates the development advanced photonic devices. However, achievement robust wide wavelength tunable and broadband emission remains a great challenge, mainly due to fixed energy levels conventional dopants limited inhomogeneous broadening in common hosts. Here, study proposes that cluster mesoscopic scale ≈1 nm may break this bottleneck issue demonstrate strategy for management photon by engineering...
We investigate ultra-broadband wavelength converters based on cascaded second-harmonic generation and difference frequency using Bessel-chirped gratings (BCGs) in lithium niobate waveguides, compare them to the ones uniform grating segmented grating, respectively.For same length power, BCGs show broader bandwidth than other two types of grating.The ripple matching response is very small as well.Analysis also shows that almost conversion maximum efficiency with tolerant flatness can be...