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Advanced Networks and Telecommunication Systems (ANTS), 2009 IEEE 3rd International Symposium on

Date 14-16 Dec. 2009

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Displaying Results 1 - 25 of 57
  • Organizing Committee

    Publication Year: 2009 , Page(s): 1 - 3
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  • [Copyright notice]

    Publication Year: 2009 , Page(s): 1
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  • Message from the general co-chairs

    Publication Year: 2009 , Page(s): 1
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    Freely Available from IEEE
  • Message from the technical program co-chairs

    Publication Year: 2009 , Page(s): 1
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  • Table of contents

    Publication Year: 2009
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  • CAPEX minimization through node degree reduction in a Colorless and Directionless ROADM architecture for flexible optical networks

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (366 KB) |  | HTML iconHTML  

    Service providers are constantly searching for means to reduce costs, generate new revenue streams and increase their competitive advantage. The migration to colorless and directionless mesh architecture will enable the service providers to realize new scalability, availability, flexibility and dynamic reconfigurability demands for optical networks. But commodification and standardization of the underlying technologies has made it very difficult to differentiate their service offerings especially in terms of price and performance. Hence, leveraging the intelligence of efficient routing algorithms, service providers can notably reduce the total cost of ownership of the network. This paper presents a rationalized routing algorithm for a colorless and directionless mesh core optical network, which enables a significant CAPEX reduction by decreasing the number of active degrees of a node. View full abstract»

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  • Auto-detection of misconnected fibers in WSS based multi-degree ROADM

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (736 KB) |  | HTML iconHTML  

    Two-degree ROADM can be upgraded to next generation dynamically reconfigurable multi-degree OADM using an N×1 Wavelength Select Switch (WSS). WSS enables routing of selected wavelengths from a (local) degree to N (remote) degrees. In a typical multi-degree configuration, WSS sitting on individual degrees are connected back-to-back. This paper describes the design of a new protocol to run over an out-of-band OSC like channel established between a pair of WSS modules. This protocol creates a control channel between local degree (East or West) and a remote degree and enables detection of human errors in physical fibre connections among WSS modules. Using proposed protocol WSS module can detect various types of misconnections and in-turn can raise alarms to inform user about the same. This paper briefly discusses design of this protocol. A four degree configuration (N=2) is chosen for the ease of illustration. View full abstract»

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  • Free-space optical links using phase singularity

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (492 KB) |  | HTML iconHTML  

    In this paper, we demonstrate novel type of free-space optical links. It is a contrived idea but has a great potential for realization. The links may be exploited to exchange information in free-space. View full abstract»

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  • Performance of on-off keying optical code-division multiple access using feedback-controlled spreading sequences

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1282 KB) |  | HTML iconHTML  

    Optical code-division multiple access (OCDMA) using feedback-controlled spreading sequences (FCSSs) (FCSS/OCDMA) is presented. The bit-error rate characteristics of asynchronous FCSS/OCDMA are demonstrated by simulations in the presence of avalanche photodiode noise and thermal noise. The results indicate that FCSS/OCDMA achieves the single-user performance of conventional on-off keying (OOK) OCDMA (OOK-OCDMA) with double optical hard-limiters. View full abstract»

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  • A new QoS aware predictive scheduling in EPONs

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (181 KB) |  | HTML iconHTML  

    A new dynamic bandwidth allocation algorithm for the upstream channel of EPONs is proposed. In contrast to the existing competitive approaches, a standard prediction mechanism along with a judicious mix of QoS awareness and fairness in resource allocation is adopted in our approach. Via simulations we show that the proposed scheme offers an increase in overall system throughput while maintaining the mean packet delay and loss rate below the maximum permitted upper bounds. View full abstract»

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  • 10G-EPON efficiency

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (213 KB) |  | HTML iconHTML  

    After the success 1G-EPON in broadband access network, both industry and academia have shown great interest in the standardization of next-generation 10G-EPON. As the specification is in the final stage, it is imperative to examine the performance of this new first-mile access technology. View full abstract»

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  • Transparent (fiber to the premises) Wave Division Multiplexing Passive Optical Network

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3295 KB) |  | HTML iconHTML  

    The presented passive optical architecture is based on wave division multiplexing passive optical network (WDM-PON), which provides a solution to problems associated with current PONs. The architecture inherently reduces issues like bottleneck bandwidth, reduced security and distance limitations. Results from testing non-return-to-zero (NRZ) and return-to-zero (RZ) encoding scheme over distances between 50 km and 80 km are also briefly discussed. View full abstract»

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  • Heuristic algorithms for designing minimum cost FSO networks

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (78 KB) |  | HTML iconHTML  

    This paper presents six heuristic algorithms for designing minimum cost free spaces optics (FSO) networks. The criterion used for minimizing cost is the same as minimizing the total number of links in the network or, equivalently, minimizing the number of transceiver pairs. View full abstract»

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  • A new architecture and MAC protocol for flexible radio over fiber home networks

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3248 KB) |  | HTML iconHTML  

    In this paper we propose a new architecture and a novel media access protocol based on IEEE 802.11 for the home network. We use radio over fiber technology for our architecture where data multiplexing is considered in both wireless and wavelength domain. Our solution enhances the wireless bandwidth usage capability and can provide dynamic bandwidth allocation among users according to the user demands. Our proposed scheme also supports full range mobility for the users. View full abstract»

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  • How much to pay for protection in fiber access networks: Cost and reliability tradeoff

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    The economical aspects are most critical in the access part of the networks because of the low sharing factor of the total cost. It makes the deployment of fiber access networks relatively slow due to the high investment cost involved. Several fiber access network architectures such as homerun (sometimes referred to as point-to-point P2P), active optical networks (AONs) and passive optical networks (PONs) have been developed to support the growing bandwidth demand from both residential and business customers. Meanwhile, fault management and reliable service delivery becomes more significant due to increased dependency on electronic services all over society and the growing importance of reliable service delivery. However, there is a tradeoff between the cost of protection and the level of service reliability. Obviously, in the access part of the networks, improving reliability performance by duplication of network resources (and capital expenditures CAPEX) can be too expensive. Therefore, a real challenge for an access network operator is to operate a cost-efficient, yet reliable network that provides leading edge services at low price and with minimal downtime. In this paper we present the evolution of fiber access networks and compare reliability performance in relation to investment and management cost for some representative cases. We consider both standard and novel architectures for deployment in both sparse and dense populated areas. While some recent works focused on PON protection schemes with reduced CAPEX the current and future effort is put on minimizing the operational expenditures (OPEX) during the access network lifetime. View full abstract»

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  • Energy in ICT - Trends and research directions

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (864 KB) |  | HTML iconHTML  

    Power consumption of ICT equipment has a growing impact, both on economic and environmental level. To reduce its energy footprint, drastic actions will be required on four fronts: energy-efficient components, power management techniques, new network paradigms and policy supporting actions. This paper outlines the current trends and research for each category. View full abstract»

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  • Energy efficiency and CAPEX minimization for backbone network planning: Is there a tradeoff?

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (218 KB) |  | HTML iconHTML  

    Energy efficiency and the minimization of capital expenditures (CAPEX) for network equipment are studied for two network architectures: IP over WDM and IP over OTN over WDM. Case study results from mixed integer linear programming (MILP) formulations indicate that a CAPEX optimized network yields solutions having minimum energy consumption for both architectures. However, it is shown that the most cost efficient architecture is not always the least energy consuming. We quantify the occurring tradeoff and observe that network equipment CAPEX are dominating in terms of cost. Additionally, it is observed that the relative power contribution of different network layers is independent of the average inter-node traffic demand for both studied architectures. View full abstract»

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  • Optimal segment size for fixed-sized segment protection in wavelength-routed optical networks

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    Protecting a network against link failures is a major challenge faced by network operators. The protection scheme has to address two important objectives - fast recovery and minimizing the amount of backup resources needed. Every protection algorithm is a tradeoff between these two objectives. In this paper, we study the problem of segment protection. In particular, we investigate what is the optimal segment size that obtains the best tradeoff between the time taken for recovery and minimizing the bandwidth used by the backup segments. We focus on the uniform fixed-length segment protection method, where each primary path is divided into fixed-length segments, with the exception of the last segment in the path. We observe that the optimal segment size for a given network depends on several factors such as the topology and the ratio of the costs involved. View full abstract»

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  • Logical topology augmentation for guaranteed survivability under multiple failures in IP-over-WDM optical network

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (342 KB) |  | HTML iconHTML  

    The survivable logical topology mapping problem in an IP-over-WDM optical network is to map each link (u, v) in the logical topology (at the IP layer) into a lightpath between the nodes u and v in the physical topology (at the optical layer) such that failure of a physical link does not cause the logical topology to become disconnected. Kurant and Thiran presented an algorithmic framework called SMART that involves successive contracting of circuits in the logical topology and mapping the logical links in the circuits into edge disjoint lightpaths in the physical topology. In a recent work a dual framework involving cutsets was presented and it was shown that both these frameworks possess the same algorithmic structure. Algorithms CIRCUIT-SMART, CUTSET-SMART and INCIDENCE-SMART were also presented in. All these algorithms suffer from one important shortcoming, namely, disjoint lightpaths for certain groups of logical links may not exist in the physical topology. Therefore, in such cases, we will have to augment the logical graph with new logical links to guarantee survivability. In this paper we address this augmentation problem. We first show that if a logical topology is a chordal graph then it admits a survivable mapping as long as the physical topology is 3-edge connected and the logical topology is 2-edge connected. We identify one such chordal graph. We then show how to embed this chordal graph on a logical topology to guarantee survivability. We also show how this augmentation approach can be generalized to guarantee survivability under multiple failures. View full abstract»

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  • Achieving IP routing stability with optical bypass

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB) |  | HTML iconHTML  

    The evolution of next generation services has led to significant increase in Internet backbone traffic, and multi-layer (hybrid) IP over circuit/optical layer solutions are being explored to cope up with the growing demands for capacity. Optical circuit bypass is typically used to increase capacity in the IP layer without need for over-provisioning, which in turn reduces OPEX of the IP network. Current proposals for IP topology reconfigurations in multi-layer networks do not take into consideration the effect of modifying the network topology on routing stability. We present a new bypass-based IP topology upgrade mechanism which can be used with high frequency without significantly affecting routing in the network. We present an ILP based approach to compute the optimal bypasses in the IP layer in case of congestion and numerical results show that our proposed solution is scalable and efficient. View full abstract»

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  • A comparison of optical time slotted networks

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (109 KB) |  | HTML iconHTML  

    To harness the enormous bandwidth potential of a fiber, Time Division Multiplexing over wavelength channels has been proposed. In one type of time slotted optical network called as Time Wavelength Switched Network (TWSN), the Time Wavelength-Space Routers (TWSRs) are configured to switch time slots within a time frame. Another kind of time slotted network is the Time Domain Wavelength Interleaved Network (TWIN), which eliminates time switching within the network by using passive Wavelength Selective Switches(WSSs) in the core and an intelligent edge utilizing a fast tunable laser to emulate fast switching. In this paper, we provide an integer linear program to solve the scheduling problem for a static traffic matrix (of connections) for the TWIN network, and also present a heuristic algorithm. We then compare the performances of the two networks under dynamic traffic and investigate the benefits of having a fast reconfigurable switch as opposed to WSSs. View full abstract»

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  • Wavelength selective devices for WDM communication systems

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (175 KB) |  | HTML iconHTML  

    Depending on the application in optical communication systems different wavelength division multiplexing devices are used to increase network capacity by allowing several wavelength channels to be transmitted by one fiber, to add or drop different wavelength channels or to separate or put together channels carrying different services. Depending on the application such devices can have wide, coarse or dense channel spacing. Furthermore they can handle different number of channels. In this paper we present some of such devices, their functionality, structures and fabrication technologies. View full abstract»

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  • Some schemes for controlling gain dynamics of EDFA chains in wavelength-routed optical networks

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (233 KB) |  | HTML iconHTML  

    This paper presents a study on gain dynamics of EDFA chains in long-haul optical networks along with candidate solutions to alleviate the adverse effects caused by EDFA gain fluctuations and the corresponding results. View full abstract»

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  • Impact of channel spacing on the design of a mixed-line-rate optical network

    Publication Year: 2009 , Page(s): 1 - 3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2524 KB) |  | HTML iconHTML  

    Due to the increasing heterogeneity and the growing volume of traffic, telecom backbone networks are going through new innovations and paradigm shift. The wavelength-division multiplexed (WDM) optical networks may cost-effectively support the growing heterogeneity of traffic demands by having mixed line rates (MLR) over different wavelength channels. The coexistence of wavelength channels with different line rates in the same fiber brings up the important issue of the choice of the channel spacing that one can have in these MLR networks. The channel spacing affects the signal quality in terms of bit-error rate (BER), and hence affects the maximum reach of the lightpaths, which is a function of line rates. Various approaches to set an opportunistic width of the channel spacing can be considered: i) on a practical side, one may choose uniform fixed channel spacing specified by the ITU-T grid (typically 50 GHz); ii) alternatively, to optimize the usage of the fiber spectrum, one can explore different channel spacing for different line rates, also referred to as the "one-size-does-not-fit-all" approach; iii) else an optimal value of channel spacing that leads to minimum cost can be sought. In this work, we investigate the third case by evaluating the cost of a MLR network for different channel spacings. Our results show that, even under the assumption of uniform channel spacing for a MLR network, it is possible to identify optimal values of channel spacing for a minimum-cost MLR network design. View full abstract»

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  • System design and evaluation of a large photonic switch based on optical codes for optical burst switched networks

    Publication Year: 2009 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1562 KB) |  | HTML iconHTML  

    This paper investigates the performance of a multi-stage Clos architecture having a bufferless switch based on optical codes as basic switching element. This multi-stage switch is suitable as core node in OBS networks. Optical codes are used for coding incoming bursts in each switching element to perform the switching function. To this end it employs encoders and decoders and possible output contentions are solved in the wavelength domain by means of variable-input fixed-output wavelength converters. View full abstract»

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