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ABSTRACT: This paper investigates the problem of protecting multicast sessions in optical networks utilizing a novel segment-based protection heuristic algorithm called LP (level protection). The proposed scheme exhibits improved performance in terms of blocking probability compared to other traditional segment-based multicast protection schemes, especially when sharing techniques are also utilized. Furthermore, when physical layer impairments are also taken into account for the calculation of the working and protection light-trees, it is shown that the LP technique presents significant improvement in performance compared to the other commonly used protection techniques.
Journal of Optical Communications and Networking 09/2012; 4(9):692-702. · 1.87 Impact Factor
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01/2012: pages 443-479; , ISBN: 978-1-4614-1093-5
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ABSTRACT: This work examines protection of multicast sessions in optical networks utilizing a novel segment-based algorithm called Level Protection. Our proposed scheme exhibits improved performance compared to other segment-based multicast protection schemes.
Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2011 and the National Fiber Optic Engineers Conference; 04/2011
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ABSTRACT: Different node design architectures and node engineering approaches are considered for fully-transparent metropolitan area optical networks for the provisioning of multicast sessions. A number of multicast routing approaches are considered that take into account the physical layer constraints. The goal of this work is to minimize the overall blocking probability in the network, while ensuring that the provisioned multicast connections meet a prescribed bit error rate.
Transparent Optical Networks (ICTON), 2010 12th International Conference on; 08/2010
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ABSTRACT: This paper proposes and devises a simple and cost-effective native Ethernet-based self-healing WDM-PON access ring architecture for next-generation broadband access. Specifically, this paper proposes and devises simple, efficient, and cost-effective fully distributed fault detection and recovery schemes for the proposed WDM-PON ring architecture. The main characteristics of the proposed architecture is that it supports a fully distributed control plane among the ONUs, which enables each and every ONU to independently detect, manage, and recover most of the networking failure scenarios.
Communications (ICC), 2010 IEEE International Conference on; 06/2010
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ABSTRACT: We investigate the problem of designing and engineering metropolitan area optical networks for the provisioning of multicast sessions. The Q-factor for each session is taken into account, aiming at maximizing the admitted number of connections.
IEEE/OSA Optical Fiber Communications Conference (OFC); 03/2010
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ABSTRACT: This paper addresses the important issue of how to optimize the performance of the current mobile backhaul radio access network (RAN) infrastructure to cope with the growing and dynamic nature of the emerging data-centric mobile multimedia traffic and services. Specifically, this work proposes and devises a simple and cost-effective EPON-based dynamic multiservice RAN architecture that efficiently transports and supports a wide range of existing and emerging data-centric mobile multimedia traffic and services along with the diverse quality of service (QoS) and rate requirements set by these services.
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE; 01/2010
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ABSTRACT: The wavelength-division-multiplexed passive optical network (WDM-PON) is considered to be the next evolutionary solution for a simplified and future-proofed access system that can accommodate exponential traffic growth and bandwidth-hungry new applications. WDM-PON mitigates the complicated time-sharing and power budget issues in time-division-multiplexed PON (TDM-PON) by providing virtual point-to-point optical connectivity to multiple end users through a dedicated pair of wavelengths. There are a few hurdles to overcome before WDM-PON sees widespread deployment. Several key enabling technologies for converged WDM-PON systems are demonstrated, including the techniques for longer reach, higher data rate, and higher spectral efficiency. The cost-efficient architectures are designed for single-source systems and resilient protection for traffic restoration. We also develop the integrated schemes with radio-over-fiber (RoF)-based optical-wireless access systems to serve both fixed and mobile users in the converged optical platform.
Journal of Optical Communications and Networking 10/2009; · 1.87 Impact Factor
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ABSTRACT: We discuss and demonstrate system architectures and enabling technologies for wireless services at 10-Gb/s data rate over 60-GHz millimeter wave radio-over-fiber access system suitable for in-building and on-campus fiber networks.
Summer Topical Meeting, 2009. LEOSST '09. IEEE/LEOS; 08/2009
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ABSTRACT: Ethernet is seizing a great role in packet-based metro networks. With the growth of carrier-grade Ethernet it is becoming essential to have a transport protocol that can aid the QoS mechanisms offered by metro Ethernet services while simultaneously taking advantage of the full available bandwidth. For the past three decades much work has been performed to make up for the shortcomings of standard TCP. Most of this work has been based on the tweaking of the additive increase multiplicative decrease (AIMD) parameters. The Ethernet Services transport protocol (ESTP) takes a different approach by making the AIMD parameters vary dynamically based on the traffic policing parameters and congestion feedback that is available at the transport layer. This capability helps the transport protocol make efficient decisions influenced by the network conditions and therefore increasing the utilization efficiency and the overall transmission throughput. It is demonstrated that the increase can be achieved while maintaining fairness over different priority transmissions and a significant increase in utilization is obtained. Two types of scheduling modes are analyzed: strict priority and weighted fair scheduling.
Southeastcon, 2009. SOUTHEASTCON '09. IEEE; 04/2009
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ABSTRACT: We use novel ldquolight-tree balancing techniquesrdquo to investigate the problem of provisioning multicast sessions in metropolitan all-optical networks. The Q-factor for every path of a derived light-tree is calculated taking into account several physical layer constraints in the network and using a Q-budgeting approach. Based on the above performance, tree balancing techniques are applied to maximize the number of multicast connections that can be admitted to the network.
IEEE Photonics Technology Letters 04/2009; · 2.19 Impact Factor
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ABSTRACT: The metro Ethernet network (MEN) expands the advantages of Ethernet to cover areas wider than LAN. Ethernet Services were created to provide multiple services to this carrier-grade network that is rapidly growing popularity in North America [21], Europe [22], and Asia [23]. Techniques to police the network layer for MENs are very mature; but the transport layer relies on different flavors of TCP that do not get the most of Ethernet services. We propose a transport layer protocol that can replace previous versions of TCP to better suit metro Ethernet service policies, such as those established for specified service level agreements (SLAs). Ethernet service's traffic and performance parameters include committed information rate (CIR), excess information rate (EIR), and guaranteed packet loss rate. The purpose of this transport protocol is to integrate these parameters, which are applied at the networking layer, into the proposed transport protocol to make a smarter controller.
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE; 01/2009
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ABSTRACT: This paper investigates the problem of designing, engineering and evaluating metropolitan area transparent optical networks for the provisioning of multicast sessions. Apart from finding the minimum cost tree, our proposed technique utilizes a metric on the physical performance of the system, namely the Q-factor of the system, by calculating Q-penalties for impairments via a Q-budgeting approach, to investigate whether a multicast connection should be admitted to the network. It uses ldquotree balancing techniquesrdquo for the multicast sessions aiming at maximizing the multicast connections that can be admitted to the network.
Transparent Optical Networks, 2008. ICTON 2008. 10th Anniversary International Conference on; 07/2008
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ABSTRACT: This work proposes a simple and cost effective local access WDM-PON architecture that combines the salient features of both traditional static WDM-PON (i.e., dedicated connectivity to all subscribers with bit rate and protocol transparencies, guaranteed QoS, and increased security) and dynamic WDM-PON (i.e., efficiently utilizing network resources via dynamic wavelength allocation/sharing among end-users). Specifically, this paper proposes and devises a novel ring-based local access WDM-PON architecture that efficiently supports dynamic allocation of wavelengths/timeslots and sharing traffic as well as a truly shared LAN capability among PON end-users.
Communications, 2008. ICC '08. IEEE International Conference on; 06/2008
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ABSTRACT: Network enabling technologies and architectures design for delivering super-broadband wireless services at >1 Gb/s over optical access networks are reviewed. Cost-efficient optical mm-wave generation and transmission technology, optical OFDM, and hierarchical architecture for high-mobility access are discussed.
Optical Fiber communication/National Fiber Optic Engineers Conference, 2008. OFC/NFOEC 2008. Conference on; 03/2008
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ABSTRACT: We experimentally show the first demonstration of a super-broadband radio-over-fiber system transmitting 1-Gb/s OFDM signals on 40-GHz millimeter-wave carriers. It is achieved over 80-km SSMF without dispersion compensation with less than 0.5-dB power penalty at BER of 10<sup>-6</sup>.
Optical Fiber communication/National Fiber Optic Engineers Conference, 2008. OFC/NFOEC 2008. Conference on; 03/2008
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ABSTRACT: A centrally-controlled, bi-directional WDM-PON architecture has been demonstrated. The self- survivable scheme can protect all types of failures in distribution and feeder fibers, remote nodes, and transmitters in CO and ONUs.
Optical Fiber communication/National Fiber Optic Engineers Conference, 2008. OFC/NFOEC 2008. Conference on; 03/2008
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ABSTRACT: This work proposes a survivable ring-based local access PON architecture that addresses some of the limitations of current tree-based PON architectures including supporting private networking capability as well as providing a fully distributed cost-effective APS scheme.
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE; 12/2007
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ABSTRACT: The integration of optical and wireless systems is considered to be one of the most promising solutions for increasing the existing capacity and mobility as well as decreasing the costs in next-generation optical access networks. In this paper, several key enabling technologies for hybrid optical-wireless access networks are described, including optical millimeter-wave (mm-wave) generation, upconversion, and transmission in a downlink direction, and full-duplex operation based on wavelength reuse by using a centralized light source in an uplink direction. By employing these enabling technologies, we design and experimentally demonstrate an optical-wireless testbed that is simultaneously delivering wired and wireless services in the integrated optical-wireless and wavelength-division-multiplexing passive-optical-network access networks. The actual applications consisting of 270-Mb/s uncompressed standard-definition TV signal and 2.5-Gb/s data channels for downstream are successfully transmitted over a 25-km fiber and a 10.2-m indoor wireless link with less than a 1.5-dB power penalty. The results show that this integrated system is a practical solution to deliver superbroadband information services to both stationary and mobile users.
Journal of Lightwave Technology 12/2007; · 2.78 Impact Factor
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ABSTRACT: We experimentally demonstrated a novel radio-over-fiber scheme to simultaneously obtain independent wired and wireless signals by using only a single intensity modulator. The optical 40- or 60-GHz millimeter-wave (mm-wave) carriers are generated by means of subcarrier-multiplexing techniques to carry 2.5-Gb/s wireless signals while 10-Gb/s wired signals are imposed on the original optical carrier via regular intensity modulation. The signals with dual services are successfully transmitted over 20-km single-mode fiber (SMF-28) with less than 1.5-dB power penalty.
IEEE Photonics Technology Letters 11/2007; · 2.19 Impact Factor
