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High Capacity Optical Networks and Enabling Technologies, 2008. HONET 2008. International Symposium on

Date 18-20 Nov. 2008

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Displaying Results 1 - 25 of 54
  • [Commentary]

    Publication Year: 2008 , Page(s): 1 - 8
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  • Contributor listings

    Publication Year: 2008 , Page(s): 9
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  • [Breaker page]

    Publication Year: 2008 , Page(s): 10
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  • Author index

    Publication Year: 2008 , Page(s): 11
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  • Table of contents

    Publication Year: 2008 , Page(s): 12 - 14
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  • Emerging Technologies for Healthcare

    Publication Year: 2008 , Page(s): 15 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1550 KB) |  | HTML iconHTML  

    The paper discusses integrating of current and emerging technologies with healthcare. These technologies can be used for prevention of diseases, enhancing healthcare access, efficient and accurate diagnostics, effective healthcare delivery, rehabilitation, healthcare information management, improving quality of life at all ages and many other features. In this paper, we discuss several aspects of healthcare and technologies including: ldr development of products/devices for improving the quality of life of individuals with disabilities and help in their rehabilitation ldr development of products/processes that will allow remote monitoring of patients, remote diagnostics, provide a mechanism for healthcare professionals to collaborate in a distributed environment, and deliver treatment ldr using RFID and wireless sensor networks in tracking patients ldr developing methods, mechanisms, and processes, for preventing diseases and injuries for all age groups. View full abstract»

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  • Optical Communications, Internet2 and Global Reliance on Informatics

    Publication Year: 2008 , Page(s): 19 - 24
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    Internet2 is designed to address the shortcomings of internet and to include new innovative design initiatives in communication networks. The internet1 had very wide acceptance and has penetrated in all walks of life much beyond the expectations of the designers. The initial text only traffic has now grown into voice, video and text requiring differential services architectures. The evolving concept of bandwidth brokerage for connectivity on demand is rapidly gearing the internet applications. The internet2 is an initiative to provide network services to demanding applications in education and scientific research. It will also look ahead to applications in the next 50 years. Fiber optics will play a key role in development of an infrastructure of internet2. The DWDM technology has been widely accepted and greater utilization of the available bandwidth for un exploited range of frequencies is being considered. The initial applications tested for internet2 are for education and research community but it will soon become a global phenomena where communities will be formed to host applications of common interest. The concept will be extended to interaction between communities in the global perspective. In this paper the globally evolving scenario of involving social, commercial and intellectual communities has been discussed. A model Medical Decision Support Service (MDSS) for Pakistan has been proposed on the lines of PERN2 over internet2 for medical and health care services. A Service Architecture for Archiving and Presentation of data (SAAP) may be used to extend MDSS for global grid connectivity. View full abstract»

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  • Voice Transport Techniques over MPLS

    Publication Year: 2008 , Page(s): 25 - 29
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    In this paper, we discuss currently evolving technologies for packet based real-time voice communication. Packet based voice has gained popularity in the toll-quality market due to its flexibility and cost effectiveness. IMS (IP Multimedia Subsystem) is being developed for converged voice and data services. While initially it was intended for mobile networks, it has been expanded to include support for fixed networks. In the wired network, the quality of service needed for media traffic can be provided by MPLS and related protocols. The traffic engineering and quality of service mechanisms of MPLS and Diffserv allow the differential treatment of premium traffic on predefined LSPs (Label Switched Path). Recently T-MPLS has been introduced as the transport network for connection oriented packet switched traffic, dropping some of the MPLS features that were irrelevant for connection oriented applications. We introduce IMS and then look at implementation agreements, methods and protocols for transport of voice over MPLS (multi protocol label switching) networks. View full abstract»

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  • Performance evaluation of wavelength assignment and collision diminution for WDM switch

    Publication Year: 2008 , Page(s): 30 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3280 KB) |  | HTML iconHTML  

    This paper is aimed to evaluate the WDM technique for an optical switch in the optical access network. The design and performance parameters consist of the inbound offered load, number of wavelengths, switch size and normalized throughput. Also, it explores the wavelength domain to demonstrate the possibility of appropriation wavelength assignment in enhancing the network throughput. The simulation results show that the proposed scheme is promising hence offers low packet queuing delay. Consequently, this paper investigates the integration of the wavelength assignment scheme on top of the optical layer. This paper appears as the resolution in minimizing the chances of packet collisions via an eccentric approach in exploiting the substantial bandwidth of WDM system. This work offers flexibility as well as scalability in the high speed optical environment. View full abstract»

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  • Integrating RLP and Fast Zero Algorithm to Improve Routing Performance in Optical Multistage Interconnection Networks

    Publication Year: 2008 , Page(s): 34 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4276 KB) |  | HTML iconHTML  

    In this paper, we explore the idea of integrating the remove last pass (RLP) algorithm to the fast zero (FastZ) algorithm as the prior initial solution to improve routing performance in optical multistage interconnection networks (OMINs). OMINs are popular for its cost-effectiveness and self-routable characteristics to meet the demand for high speed switching capability. A great challenge in dealing with OMINs is the optical crosstalk caused by optical signal coupling when propagating through the switching elements comprising the architecture. Many algorithms have been developed to solve optical crosstalk using different approaches. The new fast zero with RLP (FastRLP) algorithm is developed based on the time domain approach for solving optical crosstalk in the optical omega network. Simulation results have shown that integrating RLP to FastZ algorithm successfully improved routing performance. View full abstract»

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  • Links Lifetime Estimation Based on Nodes Affinity in Wireless Ad-hoc Networks

    Publication Year: 2008 , Page(s): 39 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6028 KB) |  | HTML iconHTML  

    In most of the ad-hoc routing protocols, a static link lifetime (LL) is used for a newly discovered neighbors. Though this works well for networks with fixed infrastructures, it is inadequate for ad-hoc networks due to nodes mobility and frequent breaks of links. To overcome this problem, routing protocols with estimated LL using nodes affinity were introduced. However, these protocols also used the static estimated LL during the connection time. In contrast to that, in this paper two methods are presented to estimate LL based on nodes affinity and then continually update those values depending on changes of the affinity. In the first method, linear function is used to map the relationship between the signal strength fluctuation and LL. In the second method, fuzzy logic system is used to map this relationship in a nonlinear fashion. Significance of the proposed methods is validated using simulation. Results indicate that fuzzy method provides the most efficient and robust LL values for routing protocols. View full abstract»

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  • Heuristic Surveillance of Targets in Sensor Networks

    Publication Year: 2008 , Page(s): 46 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5137 KB) |  | HTML iconHTML  

    A surveillance system is a sort of wireless sensor network to monitor targets, where a scheduling is required for monitoring period of each sensor in order to control the power consumption of sensors. In this network, a base station makes scheduling matrices regarding to network specifications, then sends these matrices to sensors in the network. Then, the sensors act based on these scheduling matrices. Since making the scheduling matrices needs a higher complexity, a heuristic method is presented in this paper in order to reduce the complexity and to provide the scheduling matrices without affecting the network performance remarkably. By this heuristic method, scheduling matrices that have little effect on coverage of time in system are eliminated. View full abstract»

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  • Bandwidth Enhancement Technique using Series-Shunt Bootstrapping for Front-End Optical Wireless Receiver

    Publication Year: 2008 , Page(s): 52 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3135 KB) |  | HTML iconHTML  

    The performance of receiver system for the optical wireless communication is greatly determined by the performance of the front-end. However, large detection area required in optical wireless application produces high detector capacitance hence limits the bandwidth performance of the system. Thus, techniques to reduce effective detector capacitance are required to increase the receiver sensitivity, bandwidth and noise performance. A lot of papers have been previously reported successful techniques to enhance the bandwidth by employing bootstrapping technique. This paper introduces a series-shunt bootstrapping technique which exploits a series-shunt positive capacitive feedback. The modeling of the circuit is done by utilizing MATLAB. This technique boosts the bandwidth up to 1.04 GHz. View full abstract»

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  • Anomaly-aware IP Scheduler with Admission Control for 802.11n Base Station

    Publication Year: 2008 , Page(s): 57 - 62
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    IEEE 802.11n standard has fulfilled the promise of improved performance when compared to the previous generation of Wireless Local Area Networks (WLANs) with the possibility of physical transmission rate up to 600 Mbps. But the well known performance anomaly of 802.11 still remains an open issue. A mobile station tends to change its modulation and coding scheme and transmit at lower bit rate due to the signal fading and interference. Besides, the 802.11 commercial devices adopt a simple First-In-First-Out (FIFO) scheduler without isolating the traffic flows addressed to different destinations. These have lead to a problem: whenever one or more stations transmit at lower bit rate, the performance of all the stations is heavily degraded. Our experimental results have pinpointed this problem. To counteract this problem, we propose an easy to deploy and portable solution to be implemented in the 802.11n base station, known as anomaly-aware IP scheduler with admission control. This cross-layer approach requires no modification to the current 802.11 standard and runs on top of the Linux kernel. The experimental results have shown the feasibility of our solution in minimizing the performance anomaly problem. View full abstract»

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  • Utilizing Optical Burst Switching Networks for the Internet Real-Time Traffic

    Publication Year: 2008 , Page(s): 63 - 68
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4797 KB) |  | HTML iconHTML  

    The constant and rapid expansion of the Internet at such a high rate has caused its traffic to double every four to six months. A large portion of this traffic is known to be multimedia and real time traffic, which has strict requirements in term of bandwidth, delay, jitter, and loss rate. Recent studies showed that constant bit rate (CBR) and variable bit rate (VBR) traffic can reduce both the transmission and storage costs for real time traffic. Other studies showed that optical burst switching (OBS) appears to be a promising switching technique for building the next-generation Internet infrastructure. In this paper, the compatibility between the requirements of CBR and VBR traffic and the services provided by the OBS networks are investigated. Initial finding shows that there is a need for quality of service (QoS) mechanisms to guarantee the CBR and VBR traffic characteristics and contract over OBS networks. This paper also discusses the issue of providing QoS over OBS network. The result of the study shows that the current QoS over OBS is insufficient for meeting the CBR and VBR traffic requirements if carried over the OBS networks. Nevertheless, it can be a motivation for further research. View full abstract»

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  • Advance Reservation and Dynamic Scheduling of Point to Multipoint Lightpaths

    Publication Year: 2008 , Page(s): 69 - 74
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3511 KB) |  | HTML iconHTML  

    Advance reservation is a technique employed so that a request is guaranteed 100% availability of the resource it applied for sometimes earlier. In this paper we introduce the concept of advance reservation of lightpaths for a certain request characterized by some source and multiple destinations and also the time when network resources are demanded. We first present a point to multipoint adaptive routing algorithm that forms the basis of establishing lightpaths. Then the lightpaths are in fixed on the route through a wavelength assignment technique that works along with an advance reservation scheme to ensure conflict resolution among incoming requests. Based on our algorithm, we run our simulation model to generate results and exemplify the fact that advance reservation outruns on-demand reservation as far as the blocking probability is concerned. View full abstract»

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  • Multimedia Communication: RSW Control Protocol and IAX

    Publication Year: 2008 , Page(s): 75 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2854 KB) |  | HTML iconHTML  

    Multimedia communication has become basic necessity of internet users. It has become more and more relevant in distributed environments. There are many protocols available in IP telecommunication world for signaling and control of Internet telephone calls. InterAsterisk eXchange protocol and RSW are considered to be major protocols for signaling and data. These two protocols provide competitive voice and video functionality using different mechanisms and provide similar quality of service. Both protocols have been in use in very big way. This paper surveys protocol functions and mechanism for media transmission and signaling of these two protocols. This paper intended to introduce possibility of bringing together. View full abstract»

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  • Quality of Service in Mode 0 of Bimodal Burst Switching

    Publication Year: 2008 , Page(s): 80 - 85
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    One of the issues in Optical Burst Switching (OBS) scheme is that it does not ensure safe and lossless transmission. There is always a probability of burst loss associated with this phenomenon. To solve this problem a new scheme, bimodal burst switching was proposed which ensures a zero burst loss probability. In order to support different types of prioritized traffic over the same network, Quality of Service has been provided in OBS but this feature is still missing in BBS scheme. Therefore, this paper focuses on the design of efficient burst aggregation and scheduling algorithms in order to support Quality of Service in Mode 0 of BBS networks and analyze their performance using simulation. Two types of traffic used are Voice (which is modeled by Poisson arrival process) and data (which is modeled by Interrupted Poisson arrival process (IPP)). Through a simulation set-up it is shown that voice traffic is prioritized over the Internet traffic and the packet delay obtained for the voice traffic is less as compared to the Internet traffic. View full abstract»

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  • MAC Layer Dynamic Backoff Scheme for Message Delivery Reliability in Wireless Sensor Networks

    Publication Year: 2008 , Page(s): 86 - 90
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4278 KB) |  | HTML iconHTML  

    We propose using dynamic backoff on CSMA-type MAC layer protocols to improve message delivery reliability in wireless sensor networks. It is assumed that the MAC layer is able to determine message reliability requirements by reading a reliability data bit embedded within the message. The basic concept is to apply shorter random backoff times to important messages. This gives them the opportunity to test the availability of the communication channel more frequently, enhancing their chance of finding the medium idle. However, this technique might produce the opposite result by allowing the MAC layer to retry sending the important messages in a higher frequency. As a result important messages may reach their maximum retry limit, and get removed from the network. To counteract, we also propose giving the messages a maximum retry limit based on their type. In this setting, important messages will have a higher maximum retry limit. We developed a simulation program to validate our proposed dynamic backoff scheme. The results obtained show that under reasonable network utilization level, the latency is reduced for important messages. Under heavy network utilization conditions, the dynamic backoff scheme drops normal messages leaving the network resources available to handle the delivery of important messages. View full abstract»

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  • Novel Scheme for Remote LO Delivery and Wavelength Reuse for Bidirectional Radio-over-Fiber Architecture

    Publication Year: 2008 , Page(s): 91 - 96
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4965 KB) |  | HTML iconHTML  

    RoF is a promising technology to fulfill future broadband access requirements with reliability and flexibility. We present a bi-directional RoF system with high RF carrier support. An all-optical frequency up-conversion technique is employed in downlink. The technique up-converts optical IF downlink signal to optical RF signal by photonic mm-wave mixing in a photonic mixer. The LO signal for the up-conversion is optically generated in the CS and sent to RN via optical fiber. During the mixing process at RN, LO gets modulated over optical channel carrying up-converted downlink signal. This LO component is extracted and employed for remote down-conversion of uplink data to IF in BS. Hence this novel scheme requires sending single LO signal from CS that is used both in optical up-conversion (in downlink) and electrical down-conversion (in uplink). Downlink optical signal was generated in DSB format allowing for optical carrier to be re-used at BS for uplink. Bi-directional 155 Mbps data was successfully transmitted over 41 Km single mode fiber for both downstream and upstream with less than 0.2 dB power penalties. View full abstract»

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  • Simultaneous Noise Reduction and Linearity Improvement of Optical Feedforward Transmitter for Radio over Fiber Systems

    Publication Year: 2008 , Page(s): 97 - 101
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    One of the major concern for the system is the issue of noise and interference. The majority source of nonlinearity come from laser diode nonlinearity. Likewise, the linearity improvement of optical transmitter is very important to enhance system performance in term of dynamic range. This paper demonstrated the simultaneous noise reduction and linearity improvement of optical transmitter using proposed feedforward linearization scheme for radio over fiber system. The system performance is predicted based on the simulation result in term of third order intermodulation distortion (IMD3) and relative intensity noise (RIN) reduction. The results show that simultaneous reduction of IMD3 up to 33 dB and RIN up to 20 dB employing the proposed system. View full abstract»

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  • Radio-Over-Fiber (RoF) architecture integrating broadband wireline and wireless services

    Publication Year: 2008 , Page(s): 102 - 106
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    Bandwidth demands of new applications, particularly the multimedia services have stimulated the technological advancements in wireless and optical fields. Subscribers now demand much more capacity. Providing such high capacity is possible by integrating the high capacity of optical networks and flexibility of radio networks. Certain problems exist in the existing radio-over-fiber (RoF) architectures. These include complexity, cost of deployment, and constraint on transmission distance. This paper is focused to solve these problems. We have proposed RoF network architecture to provide wireless and wired access services. Our simulation results show that the extracted signals by this scheme exhibit high transmission performance, over 45 km SMF fiber. BER of 10^-13 was observed. View full abstract»

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  • HBT Optoelectronic Mixer Design for Radio over Fiber System

    Publication Year: 2008 , Page(s): 107 - 110
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2332 KB) |  | HTML iconHTML  

    Radio over fiber (RoF) system is the solution for the providing highly reliable communication service. This system is characterized by having both a fiber optic link and free-space radio path to exploit the synergy of two complementary technologies; the broadband mobile wireless access and fixed optical access. Optoelectronic mixing is required in RoF systems to detect the RF modulated optical signal and perform frequency up-conversion. In this work, three-terminal InP/InGaAs HBT with optical access has been used as the optoelectronic mixer (OEM) for front-end RoF optical receiver configuration. Thus in this configuration, the photodetection and frequency conversion can be achieved in p-i-n photodiode and HBT device, which considerably simplify the conventional method. The RoF OEM was successfully simulated using a nonlinear microwave simulator to perform harmonics balance analysis, which represented actual photodetection model and nonlinear dynamic optoelectronic mixing behavior. In this paper we reported the - 5.2 dB maximum internal mixing efficiency for 400 MHz IF modulated signal to 3.4 GHz upconverted RF signal with LO power is -2dBm, and that agreed with conventional theoretical analysis. In this article, the theory of operation, the device structure of the RoF OEM and its characteristic will be presented. View full abstract»

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  • Millimeter-Wave Carrier Generation System for Radio over Fiber

    Publication Year: 2008 , Page(s): 111 - 115
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4182 KB) |  | HTML iconHTML  

    Due to the huge demand for the mm-wave band in future communication system applications, many researchers are investigating and continue working on the generation of millimeter-wave (mm-wave) signal for radio over fiber (RoF). RoF is an expanding technology that applicable in high channel capacity, wider service coverage and broadband mm-wave access system. However, the limited availability of the RF bands require utilization of the mm-wave frequency bands to meet the obligation for higher signal bandwidth and overcome the frequency congestion in the future RoF-based optical-wireless access networks. Broadband wireless communication has introduced great interest in mm-wave bands due to its wide transmission bandwidth and also the opportunity of frequency reuse. This paper mainly focuses on the mm-wave carrier generation techniques for radio over fiber including: optical heterodyning, external modulation, optical transceiver, and up- and down-conversion. View full abstract»

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  • Correction of Nonlinearity in High-Resolution Nano-Displacement Measurements

    Publication Year: 2008 , Page(s): 116 - 120
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    In this paper, a simple method to reduce the nonlinearity in the high-resolution nano-displacement measuring system using a modified laser interferometer is presented. By using a retarder plate and improved optical head, in additional to the nonlinearity compensation, the resolution of the displacement measurement is doubled and quadrupled compared to the conventional three- and two-mode laser interferometers, respectively. In the particular case, the nonlinearity of 18.4 nm is reduced to a value of 140 pm. View full abstract»

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