We investigate the effect of environmental noise, caused by solar radiations under water, on the performance of underwater wireless optical communication (UWOC) systems. Presenting an analytical and generic model for this noise, we examine its impact on the link performance in terms of the bit error rate (BER). This study is conducted for different photo-detector types in the aim of highlighting practical limitations of establishing UWOC links in the presence of subsea solar noise. We show how the solar noise can impact the performance of UWOC links for relatively low operation depths. The results we present provide valuable insight for the design of UWOC links, which are likely to be established at relatively low depths. They can be exploited not only for the purpose of practical UWOC system deployment but also for in-pool experimental set-ups, since they elucidate the effect of ambient light on the measurements.
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http://dx.doi.org/10.1364/OE.24.025832 | DOI Listing |
Phys Rev Lett
December 2024
Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Zellescher Weg 19, 01062 Dresden, Germany.
Stable ^{205}Tl ions have the lowest known energy threshold for capturing electron neutrinos (ν_{e}) of E_{ν_{e}}≥50.6 keV. The Lorandite Experiment (LOREX), proposed in the 1980s, aims at obtaining the longtime averaged solar neutrino flux by utilizing natural deposits of Tl-bearing lorandite ores.
View Article and Find Full Text PDFAdv Sci (Weinh)
December 2024
University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
ACS Appl Mater Interfaces
December 2024
Fujian Key Laboratory of Agricultural Information Sensoring Technology, College of Mechanical and Electrical Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
The artificial photoelectric synaptic devices integrating optical signal response and data processing functions enable the simulation of the human visual system. However, the optical modulation behavior of photoelectronic synaptic devices is susceptible to interference from sunlight background, significantly hindering their applications in optical modulation. To address this issue, a Ni/AlYN/ITO structure for sunlight-interference-free artificial synaptic memristor was designed and fabricated, and the application in photoelectric modulation was demonstrated.
View Article and Find Full Text PDFPhilos Trans A Math Phys Eng Sci
December 2024
Earth System Science Interdisciplinary Center, University of Maryland at College Park, College Park, MD, USA.
Ocean tide generated magnetic fields contain information about changes in ocean heat content and transport that can potentially be retrieved from remotely sensed magnetic data. To provide an important baseline towards developing this potential, tidal signals are extracted from 288 land geomagnetic observatory records having observations within the 50-year time span 1965-2015. The extraction method uses robust iteratively reweighted least squares for a range of models using different predictant and predictor assumptions.
View Article and Find Full Text PDFMeasuring the linear polarization signal in extreme-ultraviolet (EUV) spectral lines, produced by the Hanle effect, offers a promising technique for studying magnetic fields in the solar corona. The required signal-to-noise ratio for detecting the Hanle polarization signals is on the order of 10 (off-limb) to 10 (disk center). Measuring such low signals in the photon starved observations demands highly efficient instruments.
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