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High-Capacity Optical Networks and Enabling Technologies (HONET), 2009 6th International Symposium on

Date 28-30 Dec. 2009

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Displaying Results 1 - 25 of 53
  • Welcome note

    Publication Year: 2009 , Page(s): 1 - 8
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    It is our great pleasure and an honor for us to welcome you all on behalf of the HONET 2009 organizers, and especially to welcome the International delegates from USA, Europe, Australia and SAMENA region (South Asia, Middle East, & North Africa) as well as from world's ancient civilization; the host country Arab Republic of Egypt. The beautiful Alexandria is a welcoming place for East, West, North and South and serves as a major junction and convergence point for ICT (Information and Communication Technologies). The National Science Foundation (NSF)-funded “Taj Network” has expanded to the Global Ring Network for Advanced Application Development (GLORIAD), wrapping another ring of light around the northern hemisphere for science and education. Taj now connects India, Singapore, Vietnam and Egypt to the GLORIAD global infrastructure and dramatically improves existing US network links. Taj will soon land a 1Gbps connection in Alexandria and GLORIAD-II is next. HONET tries to play an educational role among NRENs through collaborations with leading teams and researchers. View full abstract»

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  • Committees

    Publication Year: 2009 , Page(s): 9 - 10
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    Freely Available from IEEE
  • [Copyright notice]

    Publication Year: 2009 , Page(s): 11
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    Freely Available from IEEE
  • Authors index

    Publication Year: 2009 , Page(s): 12
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  • Table of contents

    Publication Year: 2009 , Page(s): 13 - 15
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    Freely Available from IEEE
  • HONET09 CD label

    Publication Year: 2009 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (596 KB)  

    The following topics are dealt with: bandwidth allocation, bandwidth on demand, all optical wavelength routed WDM networks, iterative path decomposition algorithm, hybridized parallel techniques, Internet backbone networks, light-wave communication wavelengths, secured passive optical networks, all optical interferometric detection, predictive prefetching, integrated reconfigurable optical add-drop multiplexer, telemedic sensor networks, wave-mixing optical cross connects, optical packet switch, plasmonic nanostructure gratings, adaptive fractional frequency reuse, adiabatic coherent quantum tunneling, magnetic lattices, IDMA systems, digital PPM receiver, acousto-optic deflector, high-speed laser diodes, electro-optic modulators, radio-over-fiber, optical buffers, wireless sensor networks, nanoplasmonic splitter, Mach-Zender interferometers, fiber Bragg grating, electro-absorptive quantum well, WDM network traffic grooming, optical CDMA correlation, chip level receivers, array waveguide grating, TCP protocols, OBS networks, optical chaotic communications, chaotic semiconductor laser, dynamic bi-directional multicast shared tree, and silicon microring vertical coupler. View full abstract»

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  • Holding time aware dynamic bandwidth allocation algorithm for emerging bandwidth on demand multicast applications

    Publication Year: 2009 , Page(s): 16 - 21
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (635 KB) |  | HTML iconHTML  

    Several switching architectures like circuit switching, packet switching and burst switching have been proposed and developed for efficient utilization of high speed optical networks. Among these Dynamic Optical Circuit Switching (DOCS) has been found to be more useful for provisioning requests in backbone (core) networks due to its capability to provide huge bandwidth by establishing high capacity light-paths. Now-a-days applications like video distribution of social events, live coverage of sports, e-learning and HDTV have gained popularity, in these applications normally there are multiple users requesting a particular service simultaneously. To make efficient use of optical networks under these conditions various algorithms exist in literature. In this paper we have proposed an algorithm for provisioning of multicast (point to multipoint (P2MP)) requests which utilizes the connection duration/holding time information of the request for traffic grooming. We have done so by integrating our wavelength selection strategy with existing routing approach known as Delay constrained Shortest Path (DCSP) algorithm. Besides using traditional grooming approaches we have used the concept of using multiple wavelengths for meeting the needs of the required bandwidth demands. Results show that this policy can significantly improve the network performance in terms of call and bandwidth blocking ratios. We have provided simulation results for both On-Demand and Advance reservation request of network resources. View full abstract»

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  • Telemedic sensor networks and informatics for healthcare services

    Publication Year: 2009 , Page(s): 67 - 73
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5527 KB) |  | HTML iconHTML  

    The paper reviews various recent developments in medical field and healthcare systems the network enabled sensors and emerging sensor networks that are being used to provide continuous non-obtrusive patient monitoring from nursing stations and emergency mobile units. We propose, design, and analyze a model system for developing countries based on various ICT and sensor networks projects and the work reported in the literature. The doctors, patients, nursing and emergency handling units are integrated in communities over metropolitan and wide area networks for remote monitoring, consultation and rapid response. The decision support and workflow systems enable the physicians to provide prompt advice to patients and second opinion to their peers. Various new paradigms are emerging, e.g., ¿medical tourism¿ is an interesting development where the patients can get cheaper services both in surgical procedures and post operation healthcare. On the similar lines, teleconferencing has been found highly useful for remote assistance, education and training of doctors and paramedical staff. Now Internet2 is the evolving domain for researchers and educationists; it has great promise for medical community as well. The ubiquitous connectivity through high-speed networks and grid infrastructure is becoming a reality of future and we have attempted to utilize such emerging technologies in the work presented here. The medical sensor networks are one of the enabling technologies in taking advantage of these facilities. View full abstract»

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  • Scalability analysis of wave-mixing optical cross-connects

    Publication Year: 2009 , Page(s): 74 - 79
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    In this paper, we analyze the scalability of a class of optical cross-connects (OXCs) that uses bulk wave-mixing converters to simultaneously convert multiple distinct wavelengths. For large number of wavelengths, wave-mixing OXCs provides good scalability by reducing the number of required wavelength converters through conversion sharing. However, as the number of wavelengths increases, so does the crosstalk noise in shared converters, which may limit the scalability of the network. Thus, a fair analysis for the scalability of wave-mixing OXCs must take into consideration the benefits of conversion sharing as well as the practical limitations imposed by such sharing. This paper presents an analysis of the scalability of wave-mixing OXCs. It is shown that, for W ¿ 32 and for any number of fibers, wave-mixing OXCs have a lower conversion cost compared to the optimal OXCs that use conventional converters that converts a single channel at a time. View full abstract»

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  • A novel Optical Packet Switch architecture with reduced wavelength conversion complexity

    Publication Year: 2009 , Page(s): 80 - 85
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    In this paper, a novel optical packet switch (OPS) architecture is proposed and its scheduling algorithm is implemented and analyzed. The proposed architecture makes use of shared wavelength exchange optical crossbars (WOCs) to reduce wavelength conversion complexity. Simulation results show that, under heavy traffic loads, the conversion cost of the proposed OPS architecture is only 25% of that of a typical OPS architecture. Moreover, under low traffic loads, the conversion cost of the proposed architecture can be reduced to half of that of typical OPS designs. View full abstract»

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  • Light absorption enhancement in metal-semiconductor-metal photodetectors using plasmonic nanostructure gratings

    Publication Year: 2009 , Page(s): 86 - 90
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1241 KB) |  | HTML iconHTML  

    In this paper, we adopt the finite difference time-domain (FDTD) method to optimize the absorption of a novel metal-semiconductor-metal photodetector (MSM-PD) structure based on the use of a double-layer nanostructured metal grating. The metal fingers of the MSM-PDs are etched with appropriate depths to maximize light absorption through plasmonic effects. Simulation results show 40 times enhancement in 980 nm light trapping due to extraordinary optical signal propagation through the nanostructured double-metal grating, in comparison to conventional MSM-PDs. View full abstract»

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  • Nanophotonics-based devices and applications

    Publication Year: 2009 , Page(s): 91 - 95
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    In this paper, we discuss the use of nanophotonics to design and fabricate devices that can be used in diverse application areas. Examples of devices include microlensed-Vertical Cavity Surface Emitting Lasers (VCSEL), resonant-cavity-enhanced photodetector arrays, multiwavelength monolithically grown DFB laser diode arrays, and photonic crystals. Potential applications are discussed, including optical interconnects, WDM-passive optical networks, and bio-sensors. View full abstract»

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  • Adaptive Fractional Frequency Reuse (AFFR) scheme for multi-cell IEEE 802.16e systems

    Publication Year: 2009 , Page(s): 96 - 102
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB) |  | HTML iconHTML  

    In this paper we present a new adaptive fractional frequency reuse scheme (AFFR) for multi-cell OFDMA based IEEE 802.16e network. The adaptive fractional frequency reuse (AFFR) scheme is managed by the access service network gateway (ASN-GW) which coordinate a set of BSs (one cluster). To make better usage of radio resources; we assume that the cell area is virtually divided into two different zones: the fractional frequency reuse (FFR) zone which includes all users who are suffering from high inter-cell interference ICI from neighbouring cells and the full usage (FU) zone where inter-cell interference ICI can be neglected. The base station BS assigns users to each zone dynamically based on their channel state information. ASN-GW decides the set of subcarriers assigned to the FFR zone within each BS. In the FU zone; all subcarriers available in the system can be used. We provide simulation results comparing our AFFR scheme with different schemes. We examine the effect of the choice of the major system design parameters on the performance. The simulation results illustrate the superiority of the proposed scheme for multiple values of system design parameters. View full abstract»

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  • On the interplay of network structure and routing strategies for performance in scale-free networks

    Publication Year: 2009 , Page(s): 103 - 109
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (671 KB) |  | HTML iconHTML  

    Network performance; characterized by the maximum end-to-end traffic flow the network is able to handle without overloading and has as short a route as possible between any two nodes while keeping the congestion in the network as low as possible; is an important issue in the design of Internet Service Provider's topologies. In this paper, we examine how the structural characteristics of network topologies affect the network performance and examine the interplay between structural characteristics of network topologies and routing strategies. We consider routing strategies subject to practical constraints (router technology) and economic considerations (link costs) at layer 3. We propose two new routing methods suitable for implementation in large networks and examine various routing strategies (local, global, and hybrid) with tunable parameters and explore how they can enhance the network performance. We find that there exists an optimal range of values for the tunable parameters to achieve high network performance which depends on the structural properties of the network topology. We also show that our proposal routing scheme with the minimum local information achieves high network performance. View full abstract»

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  • Affordable and accessible Tele-healthcare to rural areas of Pakistan through web and mobile based technologies

    Publication Year: 2009 , Page(s): 110 - 114
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3189 KB) |  | HTML iconHTML  

    Development in information and communication technology (ICT) has the potential to provide affordable and accessible Tele-healthcare services in developing countries. In rural and remote areas of Pakistan, lady health workers (LHWs) are the main source of healthcare provision. This paper presents a model for providing tele-healthcare services using web and mobile phone based technologies to rural and resource-poor areas of Pakistan. Using the proposed model in this paper, these LHWs will be using SMS and MMS technology to provide healthcare services to people in rural areas of Pakistan. The initiative led to Jaroka Tele-healthcare project, in which the actual implementation of the model is being carried out. This project is currently implemented in Zahidabad, a village in Mardan, NWFP Pakistan. We also discuss the project implementation, methodology, its services and statistics of treatment of patients at Mardan facility, potential benefits and challenges. View full abstract»

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  • Ratio-counter based dynamic bandwidth allocation algorithm (RCDBA) extending EFDBA

    Publication Year: 2009 , Page(s): 115 - 119
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4006 KB) |  | HTML iconHTML  

    Ethernet Passive Optical Networks (EPONS) are a low-cost high-speed broadband access solutions for today's bandwidth hungry applications. While, downstream transmission in broadcast, upstream poses many a problems. The most critical challenge is to be able to allocate bandwidth among contending users while keeping starvation down and giving everyone a chance to transmit if they want. In this paper, we attempt to take forward work done by Byungjoo Park et al. (2008) in presenting EFDBA - dynamic bandwidth allocation algorithm. EFDBA fairly allocates bandwidth to users but, in our view, also wastes some time slots since the allocation units are not granular. We have presented a ratio counter based approach that ensures minimum wastage of bandwidth. The basic idea is to divide the available bandwidth pieces equal to the minimum requirement from any ONU. This approach leads to many benefits as presented in later sections of the paper. In the end we present a comparison of RC-DBA with EFDBA along with results of our simulation. View full abstract»

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  • Adiabatic coherent quantum tunneling of ultracold atoms trapped in an asymmetrical two-dimensional magnetic lattices

    Publication Year: 2009 , Page(s): 120 - 124
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1553 KB) |  | HTML iconHTML  

    We propose a new method to realize a two-dimensional magnetic lattice, having two different configurations of asymmetric magnetic lattice, which exhibits magnetic band gap structure, and a symmetric magnetic lattice. We also describe the tunneling mechanisms of magnetically trapped ultracold atoms, prepared in a degenerate quantum gas such as Bose-Einstein Condensate (BEC). A coherent quantum tunneling of ultracold atoms between the sites of the asymmetrical magnetic lattice can be realized which induces the adiabatically controlled dc Josephson current. At critical phase transitions, namely at certain values of site phase difference and population fraction, a plasma oscillation can be observed in which it forms a discharging Josephson state to be used as coherently coupled n quantum bits. View full abstract»

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  • Evaluate the blocking performance for “all optical wavelength routed WDM networks with and without wavelength converters” using the iterative path decomposition algorithm

    Publication Year: 2009 , Page(s): 22 - 29
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    Wavelength-routed networks can effectively utilize the bandwidth of the optical fibers. Wavelength converters help to reduce the blocking probability of the network and enhance the fiber utilization. We use the iterative path decomposition algorithm to evaluate accurately and efficiently the blocking performance of 14-node NSFNet with and without wavelength converters. The iterative algorithm analyzes the original network by decomposing it into single-path subsystems. These subsystems are analyzed in isolation, and the individual results are appropriately combined to obtain a solution for the overall network. View full abstract»

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  • Implementation design and analysis of coded and un-coded multi- user IDMA system

    Publication Year: 2009 , Page(s): 125 - 128
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    Wireless communication system is desired to be bandwidth and power efficient, allow for low complexity transceivers, should be flexible with respect to data rate and provide mitigation against fading. Unlike previous schemes like CDMA and OFDM, a very recent scheme is interleave-division-multiple-access (IDMA) that claims to fulfill all the above requirements. In this paper a multi-user coded and un-coded IDMA communication system is analyzed. Turbo encoder is use as a coding scheme. Estimation is incorporated in the system for improvement performance of channel gains and multi-path delays. View full abstract»

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  • Aggregation scheme implementation for vital signs data over the network

    Publication Year: 2009 , Page(s): 129 - 133
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    In this paper, the aggregation and transmission scheme for vital signs data in MEDTOC (medical data transmission over cellular network) is presented. MEDTOC has been designed for dealing with emergency medical data from disaster sites. Since some of the patients may be in critical condition, it is imperative to keep the physicians aware of the vital signs of multiple patients in transit to the hospital. Simulation studies have shown that aggregate uncompressed data of 4-16 patients can be transmitted reliably using 3G cellular network from a large moving ambulance. We have specified the aggregation headers and optional data reduction in MEDTOC before converting the vital signs data to suitable format for cellular network transmission. In this paper, the aggregation scheme to efficiently transmit the vital signs of 4 patients is outlined. This scheme, being a part of MEDTOC, has been implemented using data transmission between client and server in C language on Linux hosts. The algorithm and C program details are discussed and successful transmission and reception of data are presented. The OPNET simulation results are also presented that show transfer of data using 3G cellular network. Next steps include implementation of complete data transformation cycle from individual vital signs data into aggregate and optionally reduced data embedding the packets in conversational class IP traffic in 3G UMTS cellular network and conducting physical tests of the scheme with loaded cellular network and moving ambulances. View full abstract»

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  • A novel digital PPM receiver using an acoustooptic deflector

    Publication Year: 2009 , Page(s): 134 - 141
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    A novel receiver for optical digital PPM signals using an acoustooptic deflector (AOD) is presented. The error performance of this receiver in the presence of AWGN is the same as that in conventional digital PPM receivers. However, the presented receiver saves the hardware complexity encountered in conventional receivers, especially for large number of time slots. In digital PPM, larger number of slots is required in order to reduce the power requirements. The presented receiver may require no slot recovery and block or frame recovery can be achieved at the expense of very small reduction in transmission efficiency. The AO PPM receiver also provides less interference from neighboring symbols, which results in improved error performance. The intersymbol interference can be reduced using pulse shaping or increasing the spatial separation between pulses. Commercially available AODs can demodulate digital PPM signals with number of slots M as large as one thousand. The geometry, design, and operation of an AO DPPM receiver is introduced, error performance is discussed, and interference analysis is presented. Computer simulation for an AO DPPM receiver with M=128 is presented and results are shown. View full abstract»

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  • Performance characteristics of high speed laser diodes under thermal-irradiated operating conditions

    Publication Year: 2009 , Page(s): 142 - 147
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    In the present paper, the performance characteristics of high speed laser diodes based on vertical cavity surface emitting laser (VCSEL) are deeply and parametrically investigated under thermal-irradiated operating conditions. The processed characteristics are: the harmonic response transfer function, the resonance frequency, 3-dB bandwidth, and the rise time. These diodes affect the transmitted bit-rate in high-speed advanced optical communication systems. The effects of both ambient temperature (and consequently the inner temperature), the injected current (power), and the dose of irradiation are deeply investigated. The pulse rise time and the resonance frequency as well as the 3-dB bandwidth are the major criterions of the device speed. Nonlinear relations are correlated to investigate the power-current and the voltage-current dependences of the devices. View full abstract»

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  • Recent applications of the electrooptic modulators in radio-over-fiber (ROF)

    Publication Year: 2009 , Page(s): 148 - 153
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    Design of electrooptic modulators in the applications of radio-over-fiber (ROF) has been studied and investigated in the present paper. Integrated optic design is handled to build a tank circuit to obtain the maximum output power. The modulated bandwidth is deeply and parametrically studied over wide ranges of the affecting sets of parameters via specially-designed software which processes the interaction of causes and effects. The design parameters of the tank circuit have been processed over large operating requirements. The output due to the nonlinear distortion has been also analyzed, and its penalty is computed. Crystal modulator made of Potassium Dihydrogen Phosphate (KDP) crystal is processed. View full abstract»

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  • Electrical properties measurements of commercial GaN blue light emitting diode

    Publication Year: 2009 , Page(s): 154 - 157
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    The present work reports some experimental results on the electrical properties of commercial Gallium Nitride blue light emitting diode (GaN blue LED). Many instruments have been used in this study to make different kinds of measurements. For example, Keithley 238 high current measure unit, Boonton 7200 capacitance meter, and Wayne Kerr 6440 precision component analyzer (within frequency range from 20 Hz to 3 MHz). In this paper, the electrical properties of the selected sample are studied in details under wide range of temperatures (100-440) K. Analysis and discussion for the obtained results are adopted. View full abstract»

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  • Survey and evaluation of real-time fall detection approaches

    Publication Year: 2009 , Page(s): 158 - 164
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB) |  | HTML iconHTML  

    As we grow old, our desire for independence does not diminish; yet our health increasingly needs to be monitored. Injuries such as falling can be a serious problem for the elderly. If a person falls and is not able to get assistance within an hour, casualties arising from that fall can result in fatalities as early as 6 months later. It would seem then that a choice between safety and independence must be made. Fortunately, as health care technology advances, simple devices can be made to detect or even predict falls in the elderly, which could easily save lives without too much intrusion on their independence. Much research has been done on the topic of fall detection and fall prediction. Some have attempted to detect falls using a variety of sensors such as: cameras, accelerometers, gyroscopes, microphones, or a combination of the like. This paper is aimed at reporting which existing methods have been found effective by others, as well as documenting the findings of our own experiments. The combination of which will assist in the progression towards a safe, unobtrusive monitoring system for independent seniors. View full abstract»

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