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We explore using a switchable detector array to reduce the deadtime effect in an OAM-encoded quantum system. For a 4-OAM-state system, the switchable 16-detector array could provide >15X incident photon rate improvement, as compared to a non-switchable 4-detector array.
We experimentally demonstrate an OAM-based quantum communication link populated by a classical channel. OAM enables an up to 100-Mbit/s quantum data rate as well as an additional 18.5-dB separation between the quantum and classical channels.
We demonstrate the use of orbital angular momentum based spatial spectrum analysis for the estimation of object parameters. The proposed approach is insensitive to object rotation or probing beam diffraction caused by object truncation.
Multi-terminal HVDC system has gradually become a focus of DC transmission development because of superior economic efficiency and flexibility. It can effectively solve the breaking problems of DC short circuit current happened in multi-terminal HVDC system by developing a high voltage DC circuit breaker (DCCB) suitable for development needs of DC transmission system in our country, and this does...
In this paper, we propose a new design of a dual-polarization near-field focused reflective metasurface for wireless power transfer. The reflective metasurface is composed of printed cross-dipole elements with different arm lengths, which is aimed to independently generate focused point with dual-polarization. Numerical simulations demonstrate that the proposed reflective metasurface can focus the...
In this paper, we analyze the characteristics of a printable mid-range one transmitter coil to four small receiver coils wireless power transfer (WPT) system. The size of the transmitter coil is 40.4cm ×40.4cm × 2mm. The four receiver coils is identical and each one has the size of the 13.6cm × 13. 6cm × 1mm. The spacing distance is 80cm between the transmit coil to the surface of the four receiver...
Rolling bearings are an important part of wind turbine systems. Shaft current induced damages are one of the main causes for bearing failures, which lead to considerable operation loss of wind turbine plants. In this paper, the characteristics of shaft current damages and their induced vibration responses are studied analytically. Then it suggests to use an emerging Modulation Signal Bispectrum (MSB)...
With the rapid development of electronic devices. There are more and more high performance, multi-functional electronic components, at the same time, their size is getting smaller and smaller. This demand has a greatly promoted the development of electronic packaging. Due to the precision of electronic devices, leading to a sharp increase in the current density through the lead wire, can reach the...
This paper presents a method to evaluate the reliability of software. First, failure mechanism and characteristics of failure propagation are analyzed, then the measurement method of the fault propagation characteristic attribute value is given. How to build the fault propagation graph, determine the fragile paths and the fragile modules are also studied.
Femtosecond laser micromachining on back surface have been investigated experimentally using simultaneously spatially and temporally focused (SSTF) vortex beams. Uniform ring-shape ablations have been made on back surface of borosilicate glass. The feasibility of laser micromachining using femtosecond SSTF vortex beam has been demonstrated.
We experimentally demonstrate beam displacement tracking and correction using orbital-angular-momentum (OAM) beams based position detection over a 400-Gbit/s OAM-multiplexed link. Power penalties <3 dB are achieved with the displacement up to ±10 mm.
On functional requirements of atmospheric particle monitoring system, this paper designs a distributed atmospheric particle monitoring system. The proposed system consists of a data acquisition network, embedded gateways, a database server and remote monitoring terminals. The data acquisition network consists of mobile data acquisition nodes and router nodes distributed in monitoring areas which are...
As the representative of hypersonic vehicles in the near space, X-51A and HTV-2 with high speed and irregular acceleration often adopt nonballistic maneuver flight motion, which is hard to be accurately estimated. This paper focuses on three typical nonballistic maneuver models of near space targets, and proposes a new Modified Variable Structure Interacting Multiple Model (MVSEVIM) algorithm. For...
A new design of reflective phase-shifting surface for generating an orbital angular momentum (OAM) vortex wave in the radio frequency domain is presented in this paper. The reflective phase-shifting surface consists of single-layer square patches periodically arranged. Theoretical formulations of phase-shift distributions are deduced and used to design the reflective phase-shifting surface producing...
3-axis accelerometer is a widely adopted device for applications such as fall detection of the elders, kinematic analysis, building/bridge/landslide monitoring, and so on. To retrieve the sensing data in real time, one may use a wireless module to forward those data to a gateway or server. For outdoor applications, Zigbee/IEEE 802.15.4 technology is often the candidate because it is cost effective...
Split-ring resonators (SRRs) and continuous metallic wires were used to realize double negative materials (DNGs). In this paper, we discuss two kinds of DNG structures with different periodic arrangement. One is the conventional model with air separation, and the other is the solid-state structure. Full-wave simulations are used to analyze the effective medium characteristics and the figure of merit...
We experimentally demonstrate the use of orbital angular momentum (OAM) superposition as basis for the generation of a directed energy beam. Different OAM superpositions are tested with a maximum achieved peak power gain of ∼2.5.
We experimentally demonstrate 7-fold multicasting of 20-Gbaud QPSK signals based on Kerr frequency combs generated in a silicon nitride microresonator. The effect of high phase-noise comb state on the multicasting performance has also been studied.
We demonstrate 4-Gbit/s underwater transmission of multiplexed four green OAM beams using directly-modulated 520-nm laser diode. The influence of various channel conditions, including scattering, water currents and temperature gradient (water turbulence) on system performance is investigated.
We report a transmission of 2 Gb/s signal over a two-channels, 1.2 meter OAM-multiplexed optical underwater link through water thermal inhomogeneity using 2×2 CMA equalization to mitigate crosstalk and system performance degradation.
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