<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The use of an ultra-wideband (UWB) radio technique is proposed as a viable solution for the distribution high-definition audio/video content in fiber-to-the-home (FTTH) networks. approach suitability demonstrated by transmission standards-based UWB signals at 1.25 Gb/s along different FTTH fiber links with 25 km up to 60 standard single-mode length laboratory experiment. Experimental results...

The free hardware platforms have become very important in engineering education recent years. Among these platforms, Arduino highlights, characterized by its versatility, popularity and low price. This paper describes the implementation of four laboratory experiments for Automatic Control Robotics courses at University Alicante, which been developed based on other existing equipment. Results were evaluated taking into account views students, concluding that proposed attractive to them, they...

The paper experimentally investigates the performance of Ethernet and Fast-Ethernet free space optical (FSO) communications link under influence weak atmospheric turbulence. A dedicated experimental indoor chamber is used to generate control turbulence conditions that affect FSO performance. calibrated measured data are verified with theoretical prediction. We also demonstrate methods levels determine equivalence between outdoor links. It observed connectivity links highly sensitive conditions.

Science, Technology, Engineering, and Mathematics (STEM) are key disciplines towards tackling the challenges related to Sustainable Development Goals. However, evidence shows that women enrolling in these a smaller percentage than men, especially Engineering fields. As stated by United Nations Women section, increasing number of studying working STEM fields is fundamental achieving better solutions global challenges, since potential for innovation larger. In this paper, we present Girls4STEM...

In this letter, two methods for characterizing fog attenuation in terms of atmospheric visibility V free space optics (FSO) communications are analyzed and compared. Both measure the based on using a charge-coupled device (CCD) camera laser-diode at 0.55 μm. The evaluated laboratory controlled FSO chamber operating individual wavelengths 0.83, 1.31, 1.55 μm continuous optical spectrum range 0.6-1.6 CCD technique shows great accuracy <; 50 m laser 100 m, thus allowing enhancement...

In this letter the performance of a free space optical (FSO) communication link in presence fog is experimentally investigated an indoor environment. A dedicated atmospheric chamber, replicating outdoor environment, being used to evaluate FSO under condition. Theoretical analysis supported by experimental evaluation has been carried out for intensity modulation/direct detection on-off keying non-return-to-zero (OOK-NRZ), OOK return-to-zero (OOK-RZ) and four pulse position modulation (4-PPM)...

Optical beams propagating through the turbulent atmospheric channel suffer from both attenuation and phase distortion. Since future wireless networks are envisaged to be deployed in ad hoc mesh topology, this paper presents experimental laboratory characterization of mitigation turbulence induced signal fades for two scenarios. Results measurements thermal structure constant along propagation channels, changes coherence lengths different regimes eye diagrams partially correlated turbulences...

Despite the benefits of free-space optical (FSO) communications, their full utilization is limited by influence atmospheric weather conditions, such as fog, turbulence, smoke, snow, etc. In urban environments, additional environmental factors smog and dust particles due to air pollution caused industry motor vehicles may affect FSO link performance, which has not been investigated in detail yet. Both cause absorption scattering propagating signal, thus resulting high attenuation. This work...

This paper describes the state-of-the-art of polarization multiplexing for optical networks transmission. The use division (PDM) permits to multiply user capacity and increase spectral efficiency. Combining PDM orthogonal frequency multiplexed (OFDM) modulation allows maximizing transmission capacity. experimental demonstration transmitting OFDM signals following ECMA-368 ultrawide band (UWB) standard in radio-over-fiber using passive is herein reported. impact cross-polarization cochannel...

We propose and analyze a wireless energy information transmission scheme in free-space optical (FSO) links. The results are presented for both quasi-static fast-fading conditions. derive closed-form expressions throughput, outage probability, optimal power allocation optimizing the system throughput/outage probability. Finally, we complement FSO link with an additional radio frequency (RF) to create hybrid RF-FSO reduce show that joint implementation of RF links leads considerable...

In this paper, we compare the fog attenuation of free space optical (FSO) communication systems operating at infrared wavelengths 830 and 1550 nm in controlled laboratory based environment. The is generated homogeneously along atmospheric chamber length 5.5 m. visibility (V) measured to characterize within using Koschmieder relationship 550 nm. We show that wavelength has considerably lower loss than dense moderate conditions with average difference 100 dB for (V<; 70 m), 23 thick (V = 250...

This paper presents the progress that has been made recently in TRITON project. The project is an on going research being carried out Spain which as principal objective production of AUV capable autonomous underwater interventions. GRASPER sub-project focuses developing necessary manipulation skills. Currently, a lot robotics context increasing levels autonomy for all kinds intervention operations, always require some kind physical interaction. However, if robotic land remains relatively...

In this paper, the attenuation of free space optical (FSO) communication systems operating at selected wavelengths 0.83 μm, 1.31 μm and 1.55 in controlled laboratory based fog smoke environments are compared. The generated homogeneously along indoor atmospheric chamber length 6 m. experimental results from compared for continuous spectrum range (0.6 < λ μm) attenuation. show that, unlike attenuation, resultant linearly decreases visible towards near infrared (NIR) dense to light conditions.

Free-Space Optical (FSO) communications link performance is highly affected when propagating through the time-spatially variable turbulent environment.In order to improve signal reception, several mitigation techniques have been proposed and analytically investigated.This paper presents experimental results for route diversity technique evaluations a specific case links intersects common area concurrently each passing regions with different turbulence flows.

Tras 13 campañas de excavación metódica, y una vez concluidos definitivamente los trabajos campo en la Galería del Osario cueva El Sidrón (Asturias, España), se presenta breve evaluación las investigaciones paleoantropológicas realizadas. Los restos neandertales recuperados ascienden a más 2550, que hay sumar 400 piezas industria lítica musteriense muy escasos fauna; asociación hace este yacimiento un lugar singular. Análisis sedimentológicos, tafonómicos estructurales karst aclaran el...

This letter proposes an optimized launch power for the direct detection of optical orthogonal frequency-division multiplexing (DD-OOFDM) radio-over-flber (RoF). The aim is to optimize physical layer connectivity third generation partnership program-long-term evolution employing RoF technologies. We also analytically derive expression distributed-feedback laser, laser-induced positive frequency chirping, incorporating phenomena that induce phase distortion at receiver, and explicitly explain...

In this paper, we present the experimental results free space optics (FSO) communication systems operating at visible and near infrared wavelengths (from 0.6 μm to 1.6 μm) under fog conditions. Different empirical models are typically used characterize attenuation of optical beam in FSO systems. A number evaluated order verify them experimentally fill several unmeasured gaps within entire spectrum from - (NIR) range for light dense The controlled laboratory environment compared with selected...

In this study, the authors present measurements performed on a free space optics (FSO) communications link using an indoor atmospheric chamber. particular, have generated several different optical turbulence conditions, demonstrating how even weak regime can strongly affect FSO performance. The carried out in‐depth analysis of data collected during measurements, and calculated strength (i.e. scintillation index Rytov variance) important performance metrics Q ‐factor bit error rate) to...

Magnetic near-field probes (NFP) represent a suitable tool to measure the magnetic field level from small electromagnetic interference (EMI) source. This kind of antenna is useful as probe for pre-compliance EMC measurements or debugging tasks since user can scan printed circuit board (PCB) looking locations with strong fields. When H-field point found, designer should check PCB layout and components placement in that area detect if this could result an EMI contribution focuses on analyzing...

In this paper, the feasibility of joint distribution ultra-wideband (UWB) and WIMAX wireless using polarization multiplexing as a coexistence technique is proposed experimentally demonstrated within framework passive optical networks (PON). Four single- orthogonal-polarization schemes are studied targeting to reduce mutual interference when UWB WiMAX distributed jointly through standard single-mode fiber (SSMF) without transmission impairments compensation techniques amplification....