A5059663275- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Advanced Antenna and Metasurface Technologies
- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Geophysics and Sensor Technology
- Advanced Measurement and Metrology Techniques
- Optical Wireless Communication Technologies
- Photonic Crystals and Applications
- Advanced Optical Sensing Technologies
- Antenna Design and Analysis
- Orbital Angular Momentum in Optics
- Magneto-Optical Properties and Applications
Guangzhou University
2020-2024
Shanghai University of Engineering Science
2016-2019
University of Shanghai for Science and Technology
2012-2014
Ultra-high sensitivity can be obtained near the dispersion turning point (DTP), which is intrinsically determined by characteristics of two arms in a Mach-Zehnder interferometer (MZI) and usually far from observation window. The shift DTP towards window was previously realized physically adjusting waveguide structure MZI's arms, complex hard to control. In this paper, it proposed that an MZI conveniently shifted any specified wavelength just simply down-converting spatial frequency its...
A photonic crystal fiber with hexagonally latticed circular airholes is designed to deliver single-polarization single-mode (SPSM) operation over a broad wavelength band. Base on W profile and triple-defect arrangement, such design can provide an SPSM spectrum of ~1600 nm (from 0.406 2.304 μm) confinement loss lower than 0.01 dB/km. To the best our knowledge, this broadest date for hexagonal lattice all airholes, which be realized by simple "stack draw" process. In favor broadband operation,...
Ultrasensitive refractive index (RI) sensing based on novel Vernier-effect demodulation through a single fiber Fabry–Perot interferometer (FFPI) is proposed and demonstrated. A core-offset pair used as an FFPI for RI sensing. An artificial reference spectrum (ARS) obtained by modulating extracting twice The Vernier effect realized superimposing the with ARS. By optimizing cavity length of free range (FSR) ARS, ultrahigh sensitivity 133948.33 nm/refractive unit (RIU) magnification factor...
We present a novel structure for holey fibers (HFs) with endlessly single-polarization single-mode characteristics, which is realized by introducing four elliptical airholes arranged in hexagonal matrix the core region. The validation of design done use full-vectorial finite element method. exhibit one typical that can deliver region more than 2400 nm confinement loss level lower 0.01 dB/km. have also shown persevered polarization state possesses wide wavelength band flat dispersion...
We propose a novel design of photonic crystal fiber to achieve the single-polarization single-mode transmission. The topology this only employs, with view simplicity and stability, uniformly sized circular air holes, they are all regularly latticed in pure-silica background. Guiding properties studied by use full-vector finite element method, combined perfectly matched layers as absorbing boundary conditions. It has been found that, increasing hole-to-pitch ratio can be performed broaden...
We propose a precision measurement method of laser linewidth based on short-delay self-homodyne, using the second peak-valley difference (SPVD) feature coherent power spectrum to fit linewidth. The SPVD model self-homodyne envelope was established. One-to-one correspondence among values SPVD, delay length, and determined theoretically through simulations, while reliability stability verified experimentally. By comparing detected results, it is found that fitted obtained by system closer its...
We propose a systematic solution to the problem on dispersion engineering in single-polarization single-mode (SPSM) photonic crystal fibers (PCFs) for nearly zero flattened profile. Based dispersion-approximating and -normalizing methods as well clever strategy, we have succeeded design of SPSM PCF with <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${\text{0.82}}\pm...
Terahertz fibers are highly applicable for short-haul stable terahertz transmissions, and thus have potential use in upgrading systems. In this paper, a photonic crystal structure consisting of honeycombed tubes is proposed. Numerical studies based on the plane wave expansion method demonstrate that, comparison to airholes or triangulated tubes, one proposed paper can deliver broader less dispersive bandgap, which has been further confirmed by another calculation finite element method. Then...
Since the laser linewidth is an important performance-metric for devices that use light, determining precise value of essential prerequisite evaluating overall performance laser-based devices. However, due to influence various kinds noises, current detection methods are unable measure accurately. Accordingly, we propose a simple method, which uses coherent envelope power spectrum characterize based on short delay self-homodyne system. Relying theoretical derivation, simulations, and...
In this paper, the effects of optical power factors like laser power, powers beams in two arms system, and photodetector on laser-linewidth measurements are studied. From experiments, it can be found that when average input for is about 50% its linear saturation measured line width a minimum. When equal short-delay self-homodyne narrowest. low output range laser, decreases with increase power. By comparing also clear conventional measurement method seriously affected by different noise...
Here we investigate the arbitrary conversion of transmitted linear polarized light from 0° to 90° based on all-dielectric metasurfaces. The simulation results show that proposed polarization converter can obtain with desired angle.
Here, we propose and numerically demonstrate an all-dielectric metalens based on crystalline silicon metasurface. This consists of circular pillars array can achieve beam focusing with high transmission efficiency at visible wavelength.