A5100408784- Orbital Angular Momentum in Optics
- Optical Wireless Communication Technologies
- Optical Network Technologies
- Metamaterials and Metasurfaces Applications
- Microfluidic and Bio-sensing Technologies
- Optical Polarization and Ellipsometry
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Near-Field Optical Microscopy
- Advanced Fiber Laser Technologies
- Adaptive optics and wavefront sensing
- Advanced Photonic Communication Systems
- Advanced Antenna and Metasurface Technologies
- Random lasers and scattering media
- Digital Holography and Microscopy
- Plant Reproductive Biology
- Laser-Matter Interactions and Applications
- Radio Astronomy Observations and Technology
- Quantum optics and atomic interactions
- Underwater Vehicles and Communication Systems
- Optical measurement and interference techniques
- graph theory and CDMA systems
- Spectroscopy Techniques in Biomedical and Chemical Research
- Mechanical and Optical Resonators
Taishan University
2022
Air Force Medical University
2021
Xijing Hospital
2021
University of Southern California
2013-2020
Xi'an University of Architecture and Technology
2015
Southern California University for Professional Studies
2014
One property of electromagnetic waves that has been recently explored is the ability to multiplex multiple beams, such each beam a unique helical phase front. The amount front ‘twisting’ indicates orbital angular momentum state number, and beams with different are orthogonal. Such based multiplexing can potentially increase system capacity spectral efficiency millimetre-wave wireless communication links single aperture pair by transmitting coaxial data streams. Here we demonstrate 32-Gbit...
As a recently explored property of light, orbital angular momentum (OAM) has potential in enabling multiplexing multiple data-carrying beams, to increase the transmission capacity and spectral efficiency communication system. For use OAM free-space optical (FSO) communications, atmospheric turbulence presents critical challenge. In this paper, we experimentally demonstrate simultaneous pre- post-turbulence compensation bidirectional communications link, using single adaptive optics (AO) Each...
The capacity of free-space optical (FSO) communication links could potentially be increased by the simultaneous transmission multiple orbital angular momentum (OAM) beams.For such an OAM multiplexing approach, one requires collection adequate power as well proportion phase front for a system with minimal crosstalk.Here we study design considerations OAM-multiplexed data link, analyzing loss, channel crosstalk, and penalty link in case limited-size receiver apertures misalignment between...
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...
Line-of-sight wireless communications can benefit from the simultaneous transmission of multiple independent data streams through same medium in order to increase system capacity. A common approach is use conventional spatial multiplexing with spatially separated transmitter/receiver antennae, for which inter-channel crosstalk reduced by employing multiple-input-multiple-output (MIMO) signal processing at receivers. Another fairly recent transmitting orbital-angular-momentum (OAM)...
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...
Abstract We explore the use of orbital-angular-momentum (OAM)-multiplexing to increase capacity free-space data transmission moving platforms, with an added potential benefit decreasing probability intercept. Specifically, we experimentally demonstrate and characterize performance OAM-multiplexed, optical (FSO) communications link between a ground transmitter receiver via unmanned-aerial-vehicle (UAV). achieve total 80 Gbit/s up 100-m-roundtrip by multiplexing 2 OAM beams, each carrying...
A stochastic-parallel-gradient-descent algorithm (SPGD) based on Zernike polynomials is proposed to generate the phase correction pattern for a distorted orbital angular momentum (OAM) beam. The Zernike-polynomial coefficients are obtained by monitoring intensity profile of OAM beam through an iteration-based feedback loop. We implement this scheme and experimentally show that approach improves quality turbulence-distorted Moreover, we apply patterns derived from probe emulated turbulence...
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 demonstrate a 200-Gbit/s space-division multiplexing system using two Laguerre-Gaussian (LG) beams with different radial indices (LGℓ=0,p=0 and LGℓ=0,p=1). With proper design of the change demultiplexing pattern, channel crosstalk could be minimized both channels achieve bit error rate 3.8×10-3. Moreover, four LG azimuthal (e.g., LGℓ=0,p=0, LGℓ=0,p=1, LGℓ=1,p=0, LGℓ=1,p=1 beams) is also demonstrated <-12 dB crosstalk, potentially enabling 400-Gbit/s data transmission.
We explore the mitigation of atmospheric turbulence effects for orbital angular momentum (OAM)-based free-space optical (FSO) communications with multiple-input multiple-output (MIMO) architecture. Such a system employs multiple spatially separated aperture elements at transmitter/receiver, and each transmitter contains multiplexed data-carrying OAM beams. propose to use spatial diversity combined MIMO equalization mitigate both weak strong distortions. In 2×2 FSO link containing two modes...
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 experimentally demonstrate the four-fold multiplexing of Hermite-Gaussian (HGmn) or Laguerre-Gaussian (LGlp) modes to achieve a 400 Gbit/s quadrature-phase-shift-keyed (QPSK) free-space optical communication link. In this experiment, both modal indices for HG and LG are simultaneously utilized larger potential orthogonal space. Moreover, we also investigate compare effects aperture size, lateral displacement, rotation on system. measure degree performance degradation due following: (1)...
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)...
We investigate the sensing of a data-carrying Gaussian beacon on separate wavelength as means to provide information necessary compensate for effects atmospheric turbulence orbital angular momentum (OAM) and polarization-multiplexed beams in free-space optical link. The influence beacon's compensation OAM at 1560 nm is experimentally studied. It found that performance degrades slowly with increase offset, 1520–1590 band, from beams. Using this scheme, we demonstrate 1 Tbit/s link through...
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.
We experimentally demonstrate turbulence effect mitigation in a 100-m round-trip orbital-angular-momentum (OAM)-multiplexed free-space optical communication link between ground transmitter and receiver via retro-reflecting hovering unmanned aerial vehicle (UAV) using multiple-input-multiple-output (MIMO) equalization. In our demonstration, two OAM beams at 1550 nm are transmitted to the UAV through emulated atmospheric turbulence, each carrying 20-Gbit/s signal. 2×2 MIMO equalization is used...
In this paper, we experimentally demonstrate the mitigation of atmospheric turbulence effects using phase patterns that apply inverse transmission matrix for pre-compensation in 200-Gbit/s free-space orbital angular momentum (OAM) multiplexed optical link. link, two OAM channels are multiplexed, each carrying a 100-Gbit/s quadrature-phase shift keying (QPSK) signal. uni-directional (forward) combination modes is generated designed pattern channels. After mode will carry signals from both...
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...
Orbital angular momentum (OAM) has gained interest due to its potential increase capacity in optical communication systems as well an additional domain for reconfigurable networks. This is the following: (i) coaxially propagated OAM beams with different charges are mutually orthogonal, (ii) OAM can be efficiently multiplexed and demultiplexed, (iii) OAM manipulated. Therefore, multiple data-carrying could have capability switching routing. In this paper, we discuss work involving OAM-based...