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J.J. Vegas Olmos

J.J. Vegas Olmos

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262
Publications
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2,148
Citations

Publications

Publications (262)
Conference Paper
Non-Orthogonal Multiple Access (NOMA) technique and Carrierless Amplitude Phase (CAP) modulation have been used to demonstrate pay-as-you-grow coherent Passive Optical Networks (PON) and providing a 10 Gbps aggregate data rate.
Conference Paper
Full-text available
The development of 5G wireless technology is in progress looking to cope with the increasing demands for high capacity, low latency, and ubiquitous mobile access. Cloud/Centralized Radio Access Networks (C-RAN) has been proposed as a promising approach to address the 5G benchmarks. C-RAN is a rising mobile network architecture based on the centrali...
Article
For a future 5G Ethernet-based fronthaul architecture, 100G trunk lines of a transmission distance up to 10 km standard single mode fiber (SSMF) in combination with cheap grey optics to daisy chain cell site network interfaces are a promising cost- and power-efficient solution. For such a scenario, different intensity modulation and direct detect (...
Article
In this paper, a combined non-orthogonal multiple access (NOMA) and multiband carrierless amplitude phase modulation (multiCAP) scheme is proposed for capacity enhancement of and flexible resource provisioning in 5G mobile networks. The proposed scheme is experimentally evaluated over a W-band millimeter wave radio-over fiber system. The evaluated...
Article
Full-text available
A new and generalized statistical model, called Málaga or simply ℳ distribution, has been derived recently to characterize the irradiance fluctuations of an unbounded optical wavefront propagating through a turbulent medium under all irradiance fluctuation conditions. The aforementioned model extends and unifies in a simple analytical closed-form e...
Conference Paper
Few-mode multi-core fiber systems tend to be more prone to core misalignments at splice points. By using the true vector modes of few-mode waveguides we analyze how waveguide properties affect the shape of coupling and mode-dependent loss distributions due to alignment errors between waveguides.
Article
Next generation wireless communication systems face many challenges to increase the capacity and spectral efficiency of current solutions. The worldwide mobile data traffic increased 4000-fold over the last decade, and is forecast a sevenfold increase between 2016 and 2021. To cope with these stringent demands, prospective solutions are millimeter-...
Article
This paper discusses spatially diverse optical vector network analysis for space division multiplexing (SDM) component and system characterization, which is becoming essential as SDM is widely considered to increase the capacity of optical communication systems. Characterization of a 108-channel photonic lantern spatial multiplexer, coupled to a 36...
Article
Nowadays several research projects are under progress to manage a soft migration toward the 5th generation networks. Radio over Ethernet (RoE) is one of recent topics that try to have a cost efficient and independent front-haul network. In this paper, we discuss the requirements of the 5G networks and analyze the conditions for the implementation o...
Article
This paper addresses impulse-radio ultra-wideband (IR-UWB) transmission under the Russian spectral emission mask for unlicensed UWB radio communications. Four pulse shapes are proposed and their bit error rate (BER) performance is both estimated analytically and evaluated experimentally. Well-known shapes such as the Gaussian, root-raised cosine, h...
Article
Ubiquitous broadband Internet access is one of the major goals of the next generation of wireless communications. However, there are still some locations where this is difficult to achieve. This is the case on moving vehicles and, particularly, on trains. Among the possible solutions to this problem, RoF (Radio-over-Fiber) architectures have been p...
Article
We report an operational photonics-enabled 100 Gbit/s D-band antenna polarization multiplexing system (2 × 2 MIMO) with a carrier frequency of 141 GHz, and experimentally explores antenna misalignment effects on the signal performance in terms of bit error rate. Misalignments from −10 to 10 degrees were evaluated for both the E- and H-plane, highli...
Article
Wavelength division multiplex (WDM) passive optical network (PON) is considered for converged fixed mobile broadband access networking. We propose to utilize low-cost tunable lasers at the remote sites, together with a centralized wavelength locker. Practical implementations require a transparently added downstream signaling channel and upstream pe...
Article
In this paper, we introduce a flexible scheme for the multiband approach of carrierless amplitude phase (flexible MultiCAP) modulation. The proposed modulation scheme can adapt to different data traffic demands and transmission link conditions, with advantages of variable bit rate and, therefore, power consumption adaptivity. First, simulations res...
Article
This article presents a study of antenna alignment impact on bit error rate for a wireless link between two directive W-band horn antennas where one of them is mechanically steered by a Stewart platform. Such a technique is applied to find the optimal alignment between transmitter and receiver with an accuracy of 1° both in azimuth and elevation an...
Article
In this paper a new type of radio access unit is proposed and demonstrated. This unit is composed only by the reduced amount of components (compared to conventional unit designs) to optically generate wireless signals on the W-band (75–110 GHz) in combination with a switching system. The proposed system not only achieves BER values below the FEC li...
Conference Paper
We report full C-band tunable, 10 Gbit/s capability, directly modulated MEMS-VCSEL for next generation converged mobile fronthaul and backhaul applications. Bit error rates below 10-9 were achieved over up to 40 km SSMF.
Conference Paper
A reconfigurable radio access unit able to switch wavelength, RF carrier frequency and optical path is experimentally demonstrated. The system is able to do the switching processes correctly, while achieving BER values below FEC limit.
Conference Paper
Transmission of a 46.8Gbit/s multi-band CAP signal is experimentally demonstrated over a 50m W-band radio-over-fiber link. Bit error rates below 3.8×10-3 are achieved, employing nine CAP bands with bit and power loading.
Conference Paper
60Gbit/s single side-band multi-band CAP radio-over-fiber transmission at W-band is demonstrated. A spectral efficiency of 3.8bit/s/Hz and bit error rates below 3.8×10-3 are achieved after 50m wireless transmission.
Article
In this letter a reconfigurable Remote Access Unit (RAU) is proposed and demonstrated, interfacing dense wavelength division multiplexed (DWDM) optical and W-band wireless links. The RAU is composed of a tunable local oscillator, a narrow optical filter and a control unit, making it reconfigurable via software. The RAU allows selection of a DWDM ch...
Article
An experimental demonstration of 2.5 Gbit/s real-time ultra-wideband transmission is presented, using a Schottky diode-based envelope detector fabricated ad-hoc using microstrip technology on a Rogers6002 substrate and surface-mount components. Real-time transmission with a BER below FEC threshold is achieved for 20 cm of wireless transmission at 2...
Article
Full-text available
This paper presents an optically controlled reconfigurable antenna for millimetre-wave frequency range. Silicon switches are used to control the optical reconfiguration, modifying the frequency response and radiation pattern of the antenna design. Therefore, the system can switch between the lightly licensed 28 GHz and 38 GHz frequency bands, usefu...
Article
A spatial circuit switching system based on a beam steering application for W-band wireless links is proposed and experimentally demonstrated. The system enables two simultaneous transmissions of a 2.5 Gbit/s data signal over a carrier of 81 GHz, while allowing the receiver to dynamically switch between them. The performance of the system is tested...
Article
We demonstrate 84 Gb/s four-level pulse amplitude modulation (PAM-4) over up to 1.6 km standard single mode fiber (SSMF) using a 20-GHz single mode short cavity vertical cavity surface emitting laser diode (VCSEL) at a transmission wave-length of 1525 nm. Different equalizer approaches including a common feedforward equalizer (FFE), a non-linear Vo...
Article
This letter reviews the design procedure of a high-speed Schottky video detector for high-data-rate communications within the ultra-wideband (UWB) frequencies. The classic design approach for video detectors is extended with a mixer-like analysis, which results in a more detailed assessment of the detector performance. The designed circuit is revie...
Article
Wireless monitoring of human vital signs such as breathing rate is a nonintrusive alternative to contemporary solutions relying on physical contact. To ease the installment, fiber optical transmission is used to extend the reach from the transmitter and receiver circuitry to the antenna subsystem. In this paper, a frequency modulated carrier wave r...
Conference Paper
We showcase demonstrations of “program & compile” styled optical networking as well as open platforms & standards based NFV service provisioning using a proof-of-concept implementation of the Software-Programmed Networking Operating System (SPN OS).
Conference Paper
First demonstration of photonically-enabled independent side-bands D-Band wireless transmission up to 352 Gbit/s with a BER below 3.8×10−3. These results were achieved by means of advanced DSP and antenna polarization multiplexing (2×2 MIMO).
Conference Paper
We report real-time 4x56.26-Gb/s DWDM PAM-4 transmission over 80-km SSMF with novel optical transmitter sub-assembly comprising multi-wavelength quantum-dot laser and silicon ring modulators. Pre-FEC BERs below 1E-4 are achieved after 80-km, allowing error-free operation with HD-FEC.
Conference Paper
A fiber-coupled 108-port photonic lantern spatial-MUX is characterized with a spatially-diverse optical vector network analyzer. Insertion loss, mode-dependent losses, and time response are measured, showing significant mode mixing at a fiber splice.
Conference Paper
We review some currently discussed solutions for 400 Gbit/s inter-data center WDM transmission for up to 100 km. We focus on direct detected solutions, namely PAM4 and DMT, and present two WDM systems based on these formats.
Article
To cope with the ever increasing data traffic demands in modern data centers, new approaches and technologies must be explored. Short range optical data links play a key role in this scenario, enabling very-high speed data rate links. Recently, great research efforts are being made to improve the performance of vertical-cavity surface-emitting lase...
Conference Paper
In this paper the transmission of a 15Gbit/s duobinary signal over a W-band hybrid photonic wireless link is demonstrated experimentally. The radio-over-fiber link consists of 10km SMF and a wireless distance of 50m, utilizing RF carriers at 83–87GHz. Transmission of a 15Gbit/s duobinary signal is achieved with a BER of 2.9×10−3, i.e. below the lim...
Conference Paper
In this article, we propose and test a reconfigurable Remote Access Unit (RAU) to interface optical and W-band wireless communication links (75–110 GHz), utilizing optical heterodyne signal upconversion. The RAU is composed of a tunable local oscillator, narrow optical filter and a control unit. The RAU can be software-reconfigured to select a spec...
Article
This letter proposes a W-band hybrid photonic wireless link based on a commercial small form-factor pluggable (SFP+) module and experimentally demonstrates its performance. Using a free running laser as local oscillator and heterodyne photonic upconversion, good frequency stability is achieved. Outdoor wireless transmission over 225 m with a bit er...
Article
This article presents an Ultra-Wideband (UWB) radar with a 20 km NZ-DSF extension on the transmitter side. The radar is based on telecom class signal generation, antennas, and a recording module operating at 20 Gsa/s. The radar is transmitting a pulse covering the frequencies from 3.4 to 9.9 GHz. The radar system was able to track the breathing of...
Conference Paper
A software architecture is proposed for hybrid packet/optical data centers employing programmable NETCONF-enabled optical switching matrix, and a performance evaluation is presented comparing hybrid and electrical-only architectures for elephant flows under different traffic patterns. Network throughput and jitter are evaluated on an emulation envi...
Article
Leveraging client optics based on intensity modula-tion and direct detection for point-to-point inter data center inter-connect applications is a cost and power efficient solution, but challenging in terms of optical signal-to-noise ratio (OSNR) re-quirements and chromatic dispersion tolerance. In this paper, real-time 8x28.125 GBd dense wavelength...
Article
WDM-PON is considered for next-generation broadband backhaul and radio access networking. Among different implementation choices, we propose to utilize low-cost tunable lasers at the remote sites, together with a centralized wavelength locker. Practical implementations require a transparently added downstream signaling channel and upstream per-chan...
Conference Paper
This paper presents the design and fabrication of 3D printed WR-28 waveguide horn antennas operating in the Ka-band frequency range between 26.5GHz and 40GHz. Three antennas are fabricated from polylactide acid filaments in conductive and non-conductive variants; the latter is covered with conductive paint. The gain and voltage standing wave ratio...
Conference Paper
There is a growing demand for cost-effective radio over fiber transmission techniques. In this paper, we propose and realize the reconfigurable remote access unit for radio over fiber transmission. The reconfigurable unit is build from the tunable filter and laser as well as remote controller. Successful generation of the mm wave signals up to 83 G...
Article
We present a successful experimental evaluation of 4 level Pulse Amplitude Modulation (4-PAM) and Duobinary modulation. An experimental performance evaluation is presented for Duobinary 4 PAM and other modulation formats. All modulation formants used, may be considered to be implemented in future Passive Optical Network (PON) class access networks...
Article
In this letter, the viability of wireless transmission of carrierless amplitude/phase (CAP) CAP modulation signals using photonic up-conversion with two free-running lasers is experimentally demonstrated. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2068–2070, 2016
Conference Paper
This paper presents hardware and software architecture based on Software-Defined Networking (SDN) paradigm and OpenFlow/NETCONF protocols for enabling topology management of hybrid electrical/optical switching data center networks. In particular, a development on top of SDN open-source controller OpenDaylight is presented to control an optical swit...
Conference Paper
Two pulse shapes for IR-UWB transmission under the Russian spectral emission mask are proposed and their potential experimentally demonstrated. Pulses based on the hyperbolic secant square function and the frequency B-spline wavelet are shown to enable transmission of 1.25Gbit/s signals, reaching a maximum transmission distance of 6.5m.
Conference Paper
For the first time Ultra-Wideband record data transmission rates up to 35.1Gbps and 21.6Gbps are achieved, compliant with the restrictions on the effective radiated power established by both the United States Federal Communications Commission and the European Electronic Communications Committee, respectively. To achieve these record bit rates, the...
Conference Paper
In this paper we propose a design of a reconfigurable Remote Access Unit (RAU) interfacing optical dense wavelength division multiplexed (DWDM) networks with radio communication links. To generate a radio signal the device utilizes a principles of incoherent heterodyne signal upconversion. The proposed RAU is able to operate in a whole optical C-ba...
Conference Paper
This paper presents an experimental demonstration of 2.5 Gbit/s real-time ultra-wideband (UWB) transmission using a Schottky diode based envelope detector. The envelope detector is designed and fabricated ad-hoc on a Rogers 6002 substrate using microstrip technology and surface-mount components. The receiver is able to detect an ultra-wideband sign...
Conference Paper
The bandwidth of wireless networks needs to grow exponentially over the next decade, due to an increasingly interconnected and smart environment, driven by cloud applications operating on mobile devices. Low-cost, compact and broadband wireless transceivers operating over different frequency bands will be required. The current WiFi (low) frequency...
Conference Paper
We report on the experimental demonstration of an FMCW radar operating in the 25.7–26.6 GHz range with a repetition rate of 500 sweeps per second. The radar is able to track the breathing rate of an adult human from a distance of 1 meter. The experiments have utilized a 50 second recording window to accurately track the breathing rate. The radar ut...
Conference Paper
The fast development of electronics and portable devices, intended mainly for multimedia applications, is increasing exponentially the data traffic demands per user. To cope with these new data demands in limited bandwidth systems, new technologies must be explored and new transmission schemes must be applied, evolving from classic spectral ineffic...
Article
In this paper, we propose a new hybrid network solution based on asynchronous optical code-division multiple-access (OCDMA) and free-space optical (FSO) technologies for last-mile access networks, where fiber deployment is impractical. The architecture of the proposed hybrid OCDMA-FSO network is thoroughly described. The users access the network in...
Article
We report on the first experimental demonstration of carrierless amplitude/phase modulation in a flexible multiband approach for ultrawideband high-data-rate wireless communications. An effective bitrate of 2 GB/s is achieved while complying with the restrictions on the effective radiated power established by the Russian State Commission for Radio...
Conference Paper
Four-level pulse amplitude modulation (PAM-4) and discrete multi-tone transmission (DMT) in combination with inten-sity modulation and direct-detection are two promising approaches for a low-power and low-cost solution for the next generation of data center interconnect applications. We experimentally investigate and compare both modulation formats...
Conference Paper
Terahertz wireless communications are expected to offer the required high capacity and low latency performance necessary for short-range wireless access and control applications. We present an overview of some the activities in this area in the newly started H2020 ITN project CELTA: Convergence of Electronics and Photonics Technologies Enabling Ter...
Conference Paper
Secure communications at the physical layer will become a requirement by end users soon. Current security enabling techniques involve cryptography and other higher layer methods to secure the transmitted data. This does not resolve in full the psychological need for trust, especially in access scenarios where the user may be located in public space...
Article
Full-text available
The performance and potential of a W-band radio-over-fiber link is analyzed, including a characterization of the wireless channel. The presented setup focuses on minimizing complexity in the radio frequency domain, using a passive radio frequency transmitter and a Schottky diode based envelope detector. Performance is experimentally validated with...
Article
Full-text available
In this work we discuss on the channel capacity of mm-wave Radio-over-Fiber (RoF) experimental transmissions at the W-band (75–110 GHz) over distances up to 300 m and bandwidth up to 20 GHz. In addition to an updated state-of-the-art on RoF demonstrations at such a promising frequency range, we provide a set of trade-off maps in terms of crucial re...
Article
We demonstrate the first known experiment of a real-time end-to-end 40-Gb/s pulse amplitude modulation (PAM)-4 system for next-generation access applications using 10-Gb/s class transmitters only. Based on the measurement of a real-time 40-Gb/s PAM system, low-cost upstream and downstream link power budgets are estimated. Up to 27 and 25 dB power b...
Conference Paper
In this paper, for the first time, a record UWB transmission of 10Gb/s is experimentally demonstrated employing a multi-band approach of carrierless amplitude phase modulation (MultiCAP). The proposed solution complies with the restrictions on the effective radiated power established by both the United States Federal Communications Commission and t...
Article
Ultra-wideband impulse-radio wireless transmission under the stringent conditions and complex shape of the Russian spectral emission mask is experimentally demonstrated for the first time. Transmission of 1Gbit/s and 1.25Gbit/s signals over distances of 6m and 3m is achieved with a BER below 3.8×10-3.
Conference Paper
A W-band radio-over-fiber link based on a commercial SFP+ module is demonstrated, allowing easy integration into existing PON solutions. Without active laser control good RF frequency stability and 225m wireless distance are achieved.
Conference Paper
Real-time transmission with 26-GBaud PAM-4 as a promising modulation format for data-center interconnects with operation in C-band is evaluated. For an OSNR penalty below 2 dB a dispersion tolerance of up to 10 km of SSMF is achieved.
Conference Paper
Full-text available
Real-time transmission of 400G (8x50G DWDM) PAM-4 signals for data center interconnects up to 100 km SSMF is successfully demonstrated. All channels stay well below the 802.3bj KR4 FEC limit, thus allowing error free transmission.