A5100407641- Orbital Angular Momentum in Optics
- Laser-Matter Interactions and Applications
- Optical Wireless Communication Technologies
- Advanced Fiber Laser Technologies
- Metamaterials and Metasurfaces Applications
- Optical Polarization and Ellipsometry
- Laser-Plasma Interactions and Diagnostics
- Microfluidic and Bio-sensing Technologies
- Spectroscopy and Quantum Chemical Studies
- Plasmonic and Surface Plasmon Research
- Mass Spectrometry Techniques and Applications
- Optical Network Technologies
- Near-Field Optical Microscopy
- Photonic Crystal and Fiber Optics
- Advanced Chemical Physics Studies
- Perovskite Materials and Applications
- Luminescence Properties of Advanced Materials
- Topological Materials and Phenomena
- Plant Reproductive Biology
- Radiation Detection and Scintillator Technologies
- Advanced Antenna and Metasurface Technologies
- Terahertz technology and applications
- graph theory and CDMA systems
- Underwater Vehicles and Communication Systems
- Semiconductor Quantum Structures and Devices
Wuhan Institute of Technology
2016-2023
University of Southern California
2015-2018
Wuhan National Laboratory for Optoelectronics
2012-2014
Huazhong University of Science and Technology
2012-2014
Abstract To increase system capacity of underwater optical communications, we employ the spatial domain to simultaneously transmit multiple orthogonal beams, each carrying an independent data channel. In this paper, show up a 40-Gbit/s link by multiplexing and transmitting four green orbital angular momentum (OAM) beams through single aperture. Moreover, investigate degrading effects scattering/turbidity, water current, thermal gradient-induced turbulence, find that gradients cause most...
We experimentally demonstrate and characterize the performance of a 400-Gbit/s orbital angular momentum (OAM) multiplexed free-space optical link over 120 m on roof building. Four OAM beams, each carrying 100-Gbit/s quadrature-phase-shift-keyed channel are transmitted. investigate influence impairments received power, intermodal crosstalk among channels, system power penalties. Without laser tracking compensation systems, measured channels fluctuate by 4.5 dB 5 dB, respectively, 180 s. For...
Light beams can be characterized by their complex spatial profiles in both intensity and phase. Analogous to time signals, which decomposed into multiple orthogonal frequency functions, a light beam also set of modes that are taken from an basis. Such decomposition provide tool for spectrum analysis, may allow the stable, accurate robust extraction physical object information not readily achievable using traditional approaches. As example, we measure opening angle orbital angular momentum...
We theoretically investigate high-order harmonic generation in a spatially inhomogeneous field with mid-infrared driving wavelength and few-cycle duration. It is found that this spatiotemporally synthesized electric powerful to control the quantum path; as result an ultra-broadband supercontinuum bandwidth over 300 eV can be obtained successfully. Important characteristics of attosecond pulse generation, including temporal envelope, chirp carrier–envelope phase (CEP) dependence are further...
We explore the potential of combining advantages multiple-input multiple-output (MIMO)-based spatial multiplexing with those orbital angular momentum (OAM) to increase capacity free-space optical (FSO) communications. experimentally demonstrate an 80 Gbit/s FSO system a 2×2 aperture architecture, in which each transmitter contains two multiplexed data-carrying OAM modes. Inter-channel crosstalk effects are minimized by beams' inherent orthogonality and use 4×4 MIMO signal processing. Our...
Abstract We experimentally investigate the potential of using ‘self-healing’ Bessel-Gaussian beams carrying orbital-angular-momentum to overcome limitations in obstructed free-space optical and 28-GHz millimetre-wave communication links. multiplex transmit two ( l = +1 +3) over 1.4 metres both domains. Each beam carried 50-Gbaud quadrature-phase-shift-keyed data each 1-Gbaud 16-quadrature-amplitude-modulated data. In types links, opaque disks different sizes are used obstruct at transverse...
We explore the use of spatial domain as a degree freedom for data encoding and channel hopping. experimentally demonstrate at 20 Gbit/s using four possible orbital angular momentum (OAM) modes. The influence mode spacing time misalignment between modal channels on switching crosstalk bit-error rates is investigated. find that adjacent modes with one introduces an extra power penalty 3.2 dB compared larger spacing. Moreover, we reconfigurable hopping 100 quadrature-phase-shift-keying (QPSK)...
This paper reports an experimental demonstration of a 32-Gbit/s wireless link using orbital angular momentum (OAM) and polarization multiplexing in millimeter-wave regime at 60 GHz. Results the analysis show that higher carrier frequency reduces propagation loss as well size transmitter receiver, particularly for OAM channels with values. Further, two different (with l = +1 +3) on each polarizations are spatially multiplexed, channel carries 2-Gbaud signals 16-QAM modulation. Spiral phase...
Electromagnetic waves carrying orbital angular momentum (OAM) have been used for mode division multiplexing in free-space communication systems to increase both the capacity and spectral efficiency. In case of conventional wireless links using non-OAM beams, multipath effects caused by beam spreading reflection from surrounding objects affect system performance. This paper presents results analysis, simulations, measurements a millimetre-wave link OAM at 28 GHz. Multipath-induced intra-...
In this paper, recent studies on the potential challenges for an orbital angular momentum (OAM) multiplexing system were reviewed. The design guideline a practical OAM investigated in term of (i) power loss due to beam divergence and limited-size receiver, (ii) channel crosstalk misalignment between transmitter receiver.
Analogous to time signals that can be composed of multiple frequency functions, we use uniquely structured orthogonal spatial modes create different beam shapes. We tailor the structure by judiciously choosing a weighted combination modal states within an orbital angular momentum (OAM) basis set, creating desired intensity "shapes." The weights OAM beams combined forms Fourier pair with distribution in azimuthal direction resultant beam. As example, simulate and experimentally various shapes...
Laguerre–Gaussian (LG) beams with different azimuthal indices are orthogonal to each other regardless of their radial indices. We investigate the potential advantage and impact multiplexing LG nonzero indices, compared but zero index. Our simulation results show that could help in receiving higher signal power a free-space optical link under certain short transmission distance range, especially when receiver has very limited aperture size. experimental demonstration shows more than 6 dB...
We studied the topological properties of an extended Su–Schrieffer–Heeger (SSH) model composed a binary waveguide array with alternating real and imaginary couplings. The invariant periodic structures remained quantized chiral symmetry even though system was non-Hermitian. numerical results indicated that phase transition arose when absolute values two couplings were equal. supported zero mode at boundary nontrivial preserved. By adding onsite gain loss to break symmetry, modes dominated in...
We theoretically investigate the wavelength dependence of HHG yield in spatially inhomogeneous fields with few-cycle laser pulses. The results show that first decreases a slower scaling ${\ensuremath{\lambda}}^{\ensuremath{-}4}$ as increase compared ${\ensuremath{\lambda}}^{\ensuremath{-}5}$ homogeneous fields. However, further increased, an inflection appears and then presents upward trend. Based on electron trajectories analysis, we demonstrate decrease law mainly from cutoff extension And...
We theoretically investigate the high-order harmonic generation (HHG) in a two-color multicycle inhomogeneous laser field. The results show that ionization, acceleration, and recombination of electrons HHG process can be simultaneously controlled with combination temporal waveform synthesis spatial nonhomogeneity Based on quantum-mechanical classical models, physical mechanism supercontinuum such temporally spatially shaped field is analyzed discussed. In contrast to case fundamental alone,...
We present a short-range experimental orbital-angular-momentum (OAM) multiplexing millimeter-wave communication system using patch antenna arrays. The dependence of the evolution OAM beams on number array elements and radius are analyzed. also find phase delay deviation 30 degrees leads to mode purity degrading ∼1% power 6 dB reduces by <40%. An obstruction size <10mm has not much influence generated from arrays with r = 8mm, which enables stacking multiple use these demonstrate 60 GHz...
In this paper, we explore the potential benefits and limitations of using transmitter lenses in an orbital-angular-momentum (OAM)-multiplexed free-space optical (FSO) communication link. Both simulation experimental results indicate that within certain transmission distances, at to focus OAM beams could reduce power loss OAM-based FSO links improvement might be more significant for higher-order beams. Moreover, use enhance system tolerance angular error between receiver, but they degrade...
We theoretically investigate high-order harmonic generation in UV-assisted midinfrared plasmonic fields. It is found that the quantum paths contributing to harmonics can be dramatically enhanced by adding a femtosecond UV pulse, which permits high efficient radiation under relatively low driving intensity condition and thus potentially avoids thermal damage of nanosystems. present discussions on influence pulse parameters, including delay, duration, wavelength, intensity, demonstrate...
Abstract In line-of-sight communication systems, accurate alignment between the transmitter and receiver is important to guarantee sufficient signal power at receiver. Such even more for orbital angular momentum (OAM) multiplexing systems since misalignment may cause crosstalk among channels. this paper, we demonstrate simultaneous generation tunable steering of two OAM beams utilising a custom-designed circular antenna array 28 GHz. We achieve angle up 35 degrees from normal. find that ( i...
In this paper, the generation and steering of beams carrying orbital angular momentum utilizing a custom-designed circular antenna array has been demonstrated at 28 GHz. A angle as large 30 degrees for an (OAM) beam achieved. The effect number antennas distance from to center quality is investigated through both experiments simulations. Our results indicate that: (1) As increases, mode purity generated OAM decreases; (2) Increasing improves purity; (3) For fixed antennas, high observed lower...
We demonstrate all-optical division and multiplication of the state order ℓ for data-carrying orbital angular momentum (OAM) beams. use linear optical transformations between log-polar Cartesian coordinates to: (i) divide OAM to convert from 2ℓ (ℓ = −5, −4, …, +4, +5), (ii) multiply 2ℓ. analyze mode purity bit-error-rate performance a classical two-mode multiplexed link case order. The experimental halving doubling can reach around 87% 40%, respectively. further study dependence on...
We have performed the quantum trajectory analysis for high-order-harmonic generation (HHG) with different driving laser wavelengths. By defining ratio of HHG yields $N$th and first rescattering events (${Y}_{N}/{Y}_{1}$), we quantitatively evaluate contributions from multiple rescatterings. The results show that yield increases gradually increase wavelength, which demonstrates high-order rescatterings provide ascendent to at longer wavelength. calculating classical electron trajectories,...
We demonstrate the generation of orbital angular momentum (OAM) beams using high-efficient polarization-insensitive phase masks. The OAM generated by masks are characterized in terms their tolerance to misalignment (lateral displacement or tilt) between incident beam and mask. For certain scenarios, our results show that (a) when tilt angle is within range −20 +20 deg, crosstalk among modes less than −15 dB; (b) lateral 0.3 mm could cause a large amount power leaked adjacent modes. Finally,...