B. Ortega
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A Cost-Effective and Precoding-Free Optical Frequency Multiplication Scheme for mmW Photonic Fronthauls Open
In this letter, we demonstrate a novel and cost-effective scheme for upconverting data to radiofrequency (RF) in a millimeter wave (mmW) photonic fronthaul based on optical frequency multiplication for frequency up-conversion. The approach…
Experimental demonstrations of high‐accuracy 3D/2D indoor visible light positioning using imaging multiple‐input multiple‐output receivers and artificial neural networks Open
This paper proposes and presents the first experimental demonstration of a high‐precision indoor 2D and 3D visible light positioning (VLP) system using an imaging multiple‐input multiple‐output (MIMO) configuration with supervised artifici…
Wearable photonic smart wristband for cardiorespiratory function assessment and biometric identification Open
Personalized health services are of paramount importance for the treatment and prevention of cardiorespiratory diseases, such as hypertension. The assessment of cardiorespiratory function and biometric identification (ID) is crucial for th…
Centralized full-duplex seamless photonic mmW fronthaul link based on phase modulation Open
We experimentally demonstrate a photonic full-duplex seamless millimeter wave fronthaul link, based on phase modulation, to address the challenges arising from the increased demands on the mobile fronthaul capacity and network densificatio…
On the Use of a Directly Modulated Laser in a Phase Modulated-Assisted mmW Signal Generation and Transmission Link Open
[EN] We propose and experimentally demonstrate the use of a directly modulated laser (DML) in an optical phase modulated (PM)-assisted millimeter-wave (mmW) signal generation system. A comprehensive analytical model is provided to accurate…
View article: EU COST Action on future generation optical wireless communication technologies, 2nd White paper
EU COST Action on future generation optical wireless communication technologies, 2nd White paper Open
NEWFOCUS is an EU COST Action targeted at exploring radical solutions that could influence the design of future wireless networks. The project aims to address some of the challenges associated with optical wireless communication (OWC) and …
MMW Signal Gain in DML-Based Microwave Photonic Links Under Large Signal Regime Open
[EN] This paper presents a theoretical and experimental analysis of the millimeter wave (mmW) signal gain observed in photonically generated signals by using carrier suppressed (CS) external modulation in a centralized network architecture…
Wearable cardiorespiratory monitoring with stretchable elastomer optical fiber Open
This work presents a stretchable elastomer optical fiber sensor incorporated into a belt for respiratory rate (RR) and heart rate (HR) monitoring. Different materials and shapes of prototypes designed were tested in terms of performance an…
Asymmetric hybrid full-duplex POF-based VLC transmission links Open
[EN] This paper presents an asymmetric full-duplex solution based on visible light communications (VLC) for indoor wired and wireless hybrid signal transmission. The signal is distributed by a polymer optical fiber (POF) link and passively…
Demonstration of M-QAM OFDM bidirectional 60/25 GHz transmission over 10 km Fiber, 100 m FSO and 2 m radio seamless heterogeneous fronthaul link Open
[EN] In this paper, we demonstrate the experimental transmission of 16-and 64-quadrature amplitude modulation (QAM) Long Term Evolution -Orthogonal Frequency Division Multiplexing (LTE-OFDM) signals by using mil-limetre wave frequencies at…
Harmonic and Intermodulation Distortion Analysis in Directly Modulated Lasers Over Local and Remote Photonically Generated Millimeter-Wave Signals Open
[EN] This paper presents a comprehensive analytical derivation and experimental evaluation of the impact of harmonic and intermodulation distortion on data transmission over local and remote photonically generated millimeter wave (mmW) sig…
View article: Full-duplex transmission of multi-Gb/s subcarrier multiplexing and 5G NR signals in 39 GHz band over fiber and space
Full-duplex transmission of multi-Gb/s subcarrier multiplexing and 5G NR signals in 39 GHz band over fiber and space Open
We propose a stable full-duplex transmission of millimeter-wave signals over a hybrid single-mode fiber (SMF) and free-space optics (FSO) link for the fifth-generation (5G) radio access networks to accelerate the Industry 4.0 transformatio…
On the 40 GHz Remote Versus Local Photonic Generation for DML-Based C-RAN Optical Fronthaul Open
[EN] Local and remote photonic millimeter wave (mmW) signal generation schemes are theoretically and experimentally evaluated in order to compare both approaches for practical deployment in a cloud radio access network (C-RAN) fronthaul ne…
Experimental comparison of DSB and CS-DSB mmW formats over a hybrid fiber and FSO fronthaul network for 5G Open
The telecommunication world is experiencing the 5th generation (5G) networks deployment including the use of millimeter wave (mmW) frequency bands to satisfy capacity demands. This leads to the extensive use of optical communications, espe…
Hybrid POF/VLC Links Based on a Single LED for Indoor Communications Open
A hybrid fiber/wireless link based on a single visible LED and free of opto-electronic intermediate conversion stages has been demonstrated for indoor communications. This paper shows the main guidelines for proper coupling in fiber/air/de…
Efficiency Analysis of a Truncated Flip-FBMC in Burst Optical Transmission Open
A novel Flip-filter bank multicarrier (Flip-FBMC)-based transmultiplexer (TMUX) with offset quadrature amplitude modulation is proposed to enhance the transmission performance compared to a conventional Flip-OFDM system. Moreover, the poss…
64-QAM LTE signal transmission at 25 GHz over hybrid SSMF and non-uniform turbulent FSO channel Open
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Antenna Phased Array Beamforming at 26 GHz Using Optical True Time-Delay Open
[EN] Multi-element antenna beam steering in free-licence higher frequency bands is one of the crucial features of 5G networks enabling better tracking of the users. In this paper, we present an experimental microwave photonics transmission…
Transmission of 2 bits/symbol over RoF and RoFSO links with different architectures for ubiquitous coverage Open
[EN] This paper investigates integrated radio-over-fiber and radio-over-free-space optic links in a passive optical network architecture for ubiquitous wireless coverage. Two optical millimeter-wave generation techniques, namely optical he…
Comparison of carrier suppressed and quadrature bias point external modulation for 40 GHz millimeter-wave photonic generation using a 16-QAM signal with directly modulated laser Open
[EN] A directly modulated laser usage is proposed for 16-QAM signal transmission over hybrid optical links using two optical frequency multiplication schemes based on external modulation for 40 GHz millimeter-wave (mmW) signal generation. …
Bragg Gratings Inscribed in Solid-Core Microstructured Single-Mode Polymer Optical Fiber Drawn From a 3D-Printed Polycarbonate Preform Open
This paper reports the first microstructured solid-core fiber drawn from a 3D-printed preform and the first fiber Bragg gratings inscribed in a fiber of this type. The presented fiber is made of polycarbonate and displays single-mode behav…
M-QAM signal transmission at the photonically generated K-band over thermal-induced turbulent FSO links with different turbulence distributions Open
We present a theoretical and experimental study on the impact of different thermal-induced free-space turbulence distributions on the M–quadrature amplitude modulation (M-QAM) signal transmission in radio frequency K-band over hybrid optic…
Adhesive assisted fabrication of chirped POF Bragg grating Open
[EN] FBG in polymer optical fibers (POFs) is a promising technology for a wide range of sensing applications due to a lower Young¿s modulus and a large range of applying strain. Furthermore, POFs have several properties which make them att…