Anthony Boucouvalas

Anthony Boucouvalas
University of Peloponnese | UOP · Informatics and Telecommunications

About

246
Publications
37,189
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4,684
Citations

Publications

Publications (246)
Article
We present analytical results on the bit-error probability (BEP) of arbitrary order pulse-position modulation (PPM) of optically pre-amplified receivers. We use the Laguerre photon counting distribution so as to model the statistic of the optical noise, in order to accurately model the effects of signal and spontaneous noise beating at the optical...
Article
Full-text available
The wireless information carrier shift from the radio frequencies to optical frequencies has been studied in increasing detail since the invention of the laser in the 1960s [...]
Poster
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Dear All, we have lost an excellent researcher, a fantastic colleague, a great friend and a wonderfull person :( Fary, Stan, Luis, Ali, Rafa, Erich, Rolando, Michael, Wai Pang and all other colleagues and friends
Preprint
Full-text available
We present analytical results on the effect of pointing errors on the average bit-error probability (ABEP) of optically pre-amplified pulse-position modulation (PPM) receivers. The results show that the beam width plays a key role in the ABEP and that a significant power penalty is introduced by utilizing sub-optimal widths, especially when pointin...
Article
Full-text available
We present analytical results on the average probability of error (PER) performance of an optically pre-amplified pulse-position modulation (PPM) receiver under Malaga- M fading. The results are in the form of a finite sum whose number of terms depends on the PPM modulation order and the noise modes of the amplifier, enabling the efficient calculat...
Article
Full-text available
The authors present a new method for determining the optical properties of arbitrary refractive index elliptical core fibres. The method applies the elliptic cylindrical coordinate system to Maxwell's equations and appropriately, using Fourier Transforms, operated on an elliptical core optical fibre waveguide, derives a flexible algorithm, which ca...
Article
We present an efficient approach for the probability of error (PER) of photon counting statistics in a pre-amplified optical receiver. Our approach enables a fast and highly accurate calculation of the instantaneous PER, as well as the average PER in optical wireless communications. By utilizing the proposed approximation, we assess the performance...
Article
Full-text available
We present exact and approximate results on the average probability of error (PER) for pulse position modulation (PPM) in pre-amplified optical wireless communication systems with diversity. The approximate results are obtained by combining a new mathematical formula that we derive for binary PPM and an existing formula that associates higher-order...
Article
Full-text available
We provide a very general review of the resonant transmission line method for optical fiber problems. The method has been found to work seamlessly for a variety of difficult problems including elliptical and eccentric core fibers as well as “holey” photonic crystal fibers. This new version has been shown to offer great versatility with respect to c...
Preprint
Full-text available
We provide a very general review of the resonant transmission line method for optical fiber problems. The method has been found to work seamlessly for a variety of difficult problems including elliptical and eccentric core fibers as well as “holey”, photonic crystal fibers. A latest version has been shown to offer great versatility with respect to...
Article
We present novel analytical results on the optimal combiner (OC) for pre-amplified optical wireless receivers under chi-squared noise. The results show that the OC architecture that minimizes the average bit-error rate (BER) is determined by the level of the signal-spontaneous beating noise. Moreover, the OC provides increased gain to the diversity...
Book
This book focuses on optical wireless communications (OWC), an emerging technology with huge potential for the provision of pervasive and reliable next-generation communications networks. It shows how the development of novel and efficient wireless technologies can contribute to a range of transmission links essential for the heterogeneous networks...
Article
In this work we present a new and efficient technique for the exact reconstruction of large mode area (LMA) higher order mode (HOM) optical fibers by using arbitrary shape HOM electric field profiles. One known strategy to achieve large mode areas for high power optical applications is by using optical fibers supporting multimode operation, and eng...
Article
This letter investigates the performance of underwater optical wireless communication systems (UOWC) employing optical pre-amplification as well as multiple receivers to exploit the advantages of spatial diversity. Numerical results are further provided to evaluate the error performance of pre-amplified single-input multiple-output (SIMO) UOWC syst...
Chapter
The Infrared Data Association (IrDA) has standardized the widely used IrDA 1.x protocol stack for low-cost, indoor, short-range, point-to-point connectivity. The early adoption of IrDA and the widespread installation of millions of IrDA infrared ports in mobile devices for wireless communication applications necessitates for throughput performance...
Conference Paper
Full-text available
The method of the transmission line is been applied to the case of cylindrical fibers whose refractive index is changing not only according to the distance from the core center but also according to the angle on the circle formed by the fiber cross section. The mathematical analysis provides relations that can be used to derive the fiber's mode pro...
Article
Underwater optical wireless communications systems have recently received significant attention as an attractive solution for both research and commercial use because of their ability to provide high bandwidth communications over relatively short transmission spans along with their low operational cost. However, high absorption and scattering of op...
Article
Full-text available
We propose and analyze an optimized Lambertian order (OLO) of light-emitting diode for both indoor cellular optical wireless communication (OWC) and positioning systems. We carry out analysis for the system consisting of a Lambertian source and a tilted optical receiver, and develop an expression for OLO for 4-, 6- and 9-cell configurations. We inv...
Article
Full-text available
We present a new method for solving the Schrodinger equation using the Lossless Transmission Line Model (LTL). The LTL model although extensively used in fiber optics and optical fiber design, it has not yet found application in solid state problems. We develop the transformation theory mapping the wave equation to LTL and we apply the model to the...
Article
We propose a probabilistic bandwidth sharing policy, based on the threshold (TH) policy, for a single cell of fixed capacity in a homogeneous wireless cellular network. The cell accommodates random input-Traffic originated from K service-classes. We distinguish call requests to new and handover, and therefore, the cell supports 2K types of arrivals...
Conference Paper
Full-text available
In several cases optical fibers in telecommunications have cores of non circular geometry. Fibre optic deformations appear in optical fibres for many reasons. Optical fibre core ellipticity for example where the fibre optic core is not perfectly circular due to fibre optic manufacturing tolerances, is measured and often is a problem. Optical fibre...
Article
The papers in this special section focus on optical waveguide technology and applications for its use. It seems a long time ago since Hondros and Debye in the year 1910 published the Cylindrical Dielectric Waveguide Theory and since Charles Kao in the 1960s developed the first breakthroughs of fiber optic technology. Huge steps, however, have been...
Conference Paper
Full-text available
The calculation of mode propagation constants of elliptical core fibers has been the purpose of extended research leading to many notable methods, with the classic step index solution based on Mathieu functions. This paper seeks to derive a new innovative method for the determination of mode propagation constants in single mode fibers with elliptic...
Article
We present an analytical framework for estimating the benefits that arise from the utilization of semiconductor optical amplifiers at the receiver of fade impaired outdoor optical wireless systems. We first investigate the impact of fading on both the signal optical power and the amplified spontaneous emission, and derive analytical relations that...
Article
In this paper, we consider a single link of fixed capacity that accommodates calls of different service-classes with different bandwidth-per-call requirements. The link behaves as a multirate loss system. Calls of each service-class arrive in the link according to a Poisson (random) or a quasi-random process and have an exponentially distributed se...
Article
In this paper, we propose a new multirate teletraffic loss model of a single link with certain bandwidth capacity that accommodates Poisson arriving calls, which can tolerate bandwidth compression, under the threshold policy of admission control. When compression occurs, the service time may increase (elastic calls) or not (adaptive calls). The thr...
Article
Novel results on how to reconstruct gain-guided optical fibres starting from arbitrary modal electric fields are presented. It is known that gainguided optical fibre refractive index profiles are described in terms of complex numbers. Therefore, to achieve the design of such fibres from a knowledge of modal electric fields one is required to use co...
Article
In this study, the authors discuss the mitigation of negative-exponential fading in optical wireless communication systems. The mitigation technique involves the utilisation of a semiconductor optical amplifier (SOA) that, depending on the link arrangement, acts either as regenerator or pre-amplifier. As a regenerator, the SOA gain saturates during...
Article
The authors propose a new multirate teletraffic loss model of a single link with certain capacity that accommodates different service-classes whose calls come from finite traffic sources. Calls compete for the available link bandwidth under the combination of the threshold (TH) and the bandwidth reservation (BR) policies. The TH policy can provide...
Article
The purpose of this study is to propose a method for designing planar waveguides of arbitrary modal electric field distribution. Normally, the authors know or specify a waveguide and they solve for the mode propagation constant which allows them to plot the electric field. A novel and efficient algorithm is proposed here for determining arbitrary r...
Article
The application of Optical Wireless Communications (OWC) has grown in recent years that the whole industry would benefit from common standards to which competitive products comply. Standards are essential, particularly when the market expands into high-volume products like home appliances and other consumer goods. This article offers a timely revie...
Article
In this paper, we present a new and efficient algorithm for the exact synthesis of large-mode-area (LMA) single-mode (SM) optical fibers supporting "perfect top-hat" modal electric-field profiles. We develop a technique for calculating directly and accurately the refractive-index profiles of such fibers from the knowledge of the top-hat modal elect...
Article
Software applications such as e-services need to obtain knowledge about their users. This is essential in many platforms in which the user has to get the comfort and easiness of a more personal feeling. Examples of these platforms are intelligent e-commerce applications, intelligent tutoring systems, intelligent agents, adaptive multimedia systems...
Article
In this paper, we examine for the first time how to design arbitrary shape modal fields within complex refractive index circular waveguides. In order to achieve this flexibility in field shape, we use complex refractive index profile waveguides, where we determine the required refractive index profile on both real and imaginary refractive index. We...
Article
In this study the authors discuss the performance of the link layer protocol of future 10 Gb/s short-range infrared links. The authors utilise analytical and simulation results to calculate the protocol efficiency both in a half-duplex mode of operation, which is currently standardised and a full-duplex mode that is considered for the future standa...
Article
Novel results on the link layer protocol performance of future infrared personal communication links at a line rate of 100 Gbit/s are presented. The discussion aims to demonstrate the shortcomings of the currently standardised half-duplex mode of communications in the physical layer and details its negative impact on the link layer efficiency. Resu...
Conference Paper
Full-text available
This paper investigates the impact of data encryption and decryption in indoor broadcasting visible light communications (VLC) system embedded in the physical layer. The RSA encryption has been implemented to provide a secure data transmission in the physical layer. The paper shows that the bit error rate (BER) performance for the un-secured and se...
Conference Paper
In this work we present a new and efficient algorithm for the exact synthesis of large mode area (LMA) single mode (SM) optical fibers supporting 'perfect top-hat' modal electric field profiles. In order to achieve this flexibility in field shape we use complex refractive index profile waveguides, where we determine the required refractive index pr...
Conference Paper
In this paper, we discuss the mitigation of negative-exponential fading in Optical Wireless Communication (OWC) systems. The mitigation technique involves the utilization of a semiconductor optical amplifier (SOA) whose gain saturates in normal link operation, but which also provides a power-dependent varying gain when the link experiences a fade....
Conference Paper
We present a novel fade mitigation technique that is applicable on outdoor optical wireless systems. Our key idea is to utilize the nonlinear power-dependent gain properties of a semiconductor optical amplifier (SOA) to provide unbalanced amplification between faded and non-faded instances of the optical wireless signal. We analytically demonstrate...
Article
We present and analyze a novel fade mitigation technique that is applicable on outdoor optical wireless systems. Our key idea is to utilize the nonlinear power-dependent gain properties of a semiconductor optical amplifier (SOA) to provide unbalanced amplification between faded and non-faded instances of the optical wireless signal. We analytically...
Article
Full-text available
We consider a multirate access tree network accommodating service-classes of Poisson traffic, and focus on the determination of derivatives of Call Blocking Probabilities (CBP) with respect to offered traffic-load of any service-class. Based on the derivatives, we further show how we can successfully approximate CBP for small variations of offered...
Conference Paper
We present the handoff techniques required to support mobile end-users in 60GHz Radio-over-Fiber (RoF) networks. We analyze the dominant handoff algorithms proposed for 60GHz RoF networks in outdoor environments, by emphasizing to the corresponding handoff algorithms that can be applied in high speed vehicular communications, i.e. Moving Cell (MC),...
Conference Paper
In this paper, we evaluate the utilization of a semiconductor optical amplifier (SOA) at the receiver of an outdoor optical wireless system for fade mitigation purposes. Due to its instantaneous gain response, the SOA provides saturating gain to incoming pulses and partially alleviates power variations between fade impaired and non-impaired instanc...
Conference Paper
Full-text available
Passive Optical Networks (PONs) gain ever more ground in the Telecom market, because of their low cost and significant advantages over legacy broadband access systems. We concentrate on the performance evaluation of Ethernet PONs (EPONs) and particularly on Wavelength Division Multiplexing (WDM)-EPONs which support Internet traffic. We consider tra...
Article
A combined analytical and simulation framework is presented for study of the link-layer protocol that is currently used to control the operation of Gb/s infrared links in optical-wireless-based personal communication systems. The analytical and simulation methods are utilised to evaluate protocol efficiency and demonstrate that protocol performance...
Article
In this letter, we propose a tuned elliptical Lambertian beam (ELB) model to achieve a higher transmission bandwidth than the conventional circular Lambertian beam (CLB) model for indoor optical wireless communication systems. ELB is generated by employing aM°×N° light shaping diffuser, and its power distribution is investigated. We first derive ne...
Article
Full-text available
This article presents an overview of optical wireless (OW) communication systems that operate both in the short- (personal and indoor systems) and the long-range (outdoor and hybrid) regimes. Each of these areas is discussed in terms of (a) key requirements, (b) their application framework, (c) major impairments and applicable mitigation techniques...
Conference Paper
Up to date several applications have been developed for people with disabilities and especially for the visually impaired aiming to improve their quality of life. These applications are focused on guiding by the detection of obstacles in the surrounding environment. In this paper we present a mobile application which utilizes the modern technologie...
Conference Paper
Online advertising tends to be one of the best ways for promotion and advertising in our days. The more targeted an advertisement is, the more efficient and attractive could also be to the end user. On the other hand, Internet targeted advertising is mostly based on user's personal information such as profiling, Internet habits, history, etc, even...
Article
We present an analytical model for dimensioning the buffering requirements of the link-layer in half-duplex Gb/s infrared links. Our model takes into account both physical layer parameters, including the bit-error-rate and the turnaround time of the link, and link-layer parameters, including the protocol window and frame size, in order to calculate...
Article
The multipath dispersion in a non-directed line-of-sight (LOS) indoor optical wireless communications (OWC) channel limits the transmission bandwidth. In this study, we improve the transmission bandwidth by employing a TEM_{00} mode laser beam and an alignment-free light shaping diffuser (LSD). We derive a new expression for the radiation field dis...
Conference Paper
We consider a multirate access tree network accommodating K service-classes of Poisson traffic, and focus on the determination of derivatives of Call Blocking Probabilities (CBP) with respect to offered traffic-load of any service-class. Based on the derivatives, we further show how we can successfully approximate CBP for small variations of offere...
Conference Paper
From Maxwell's equations we present a fundamental work which allows the exact synthesis of a transformation method for modeling Maxwell's equations in cylindrical coordinates of a uniform cylindrical dielectric thin layer to a set of transmission line equations. The equations are exact and general and do not require the assumption of exponential va...
Conference Paper
We consider a multirate access tree network accommodating K service-classes of Poisson traffic, and focus on the determination of derivatives of Call Blocking Probabilities (CBP) with respect to offered traffic-load of any service-class. Based on the derivatives, we further show how we can successfully approximate CBP for small variations of offere...
Conference Paper
We present an efficiency analysis for the link-layer protocol that controls the operation of state-of-the-art 1 Gb/s optical wireless links when applied to 10 Gb/s communications. We utilize analytical and simulation results to demonstrate the impact of physical layer parameters, including the link turnaround time and the bit-error-rate, on the pro...
Conference Paper
In this paper, we consider a single link that supports both elastic and adaptive traffic of Batch Poisson arriving calls, under the Bandwidth Reservation (BR) policy, whereby we can achieve specific QoS per service-class. Arriving batches have a generally distributed batch size, and can be serviced either as a whole or in part (partial batch blocki...
Article
The ever increasing demand of elastic and adaptive services, where in-service calls can tolerate bandwidth compression/expansion, together with the bursty nature of traffic, necessitates a proper teletraffic loss model which can contribute to the call-level performance evaluation of modern communication networks. In this paper, we propose a multira...
Conference Paper
Transmitting multimedia streams over IEEE 802.11 Wireless Local Area Networks (WLANs) with high performance and reliability is a challenging task. In the current paper, we study the basic problems that video transmission encounters in wireless LANs and we present some of the proposed solutions. In particular, we will outline the solutions that were...
Article
Full-text available
Versatile sensors with low cost and complexity allowing wireless-enabling characteristics are in great demand for use in a number of applications, from environmental sensing to condition monitoring and management in large areas and infrastructures. Polymer Optical Fibers (POF) have been identified as a promising photonics platform that combines a r...
Conference Paper
Full-text available
This paper describes the implications of the new trends in web development languages on log file analysis for e-commerce. The new trends in Software Development and the available Web Analytics technologies are explained. The focus is placed on the diversifications introduced to the traces left on the system that by Rich Internet Applications (RIAs)...
Conference Paper
We have developed a new user friendly, online server based database system and filtering method which allows us to analyze display data and plot seismicity maps using 'Google Maps'. The application is demonstrated using seismic data in the region of Greece and it allows segmentation of the region so that the earthquake-active regions can be identif...
Conference Paper
Full-text available
We present a new loss model for the call-level analysis of a single link, which accommodates calls of different service-classes with elastic bandwidth requirements. Calls arrive in the link according to a Batch Poisson process, a process that can be used to model traffic, which is more 'peaked' and 'bursty' than the Poisson process. The available l...
Conference Paper
Full-text available
This paper describes the road of RIWCoS architecture for reconfigurable interoperability and service continuity in wireless hybrid communications: from the IEEE 802.21 MIH standard, through generic modules design and specification, toward implementation and integration. Some key elements of the RIWCoS system are presented: the general MIH-based sys...
Article
Full-text available
3D virtual worlds are increasingly popular arenas for social interaction. There are new opportunities and possi-bilities for the style of communication but important aspects present in face-to-face meetings are absent in the artificial environment, including the visual cues of emotion that are provided by facial expressions, and a realistic represe...