Showing papers on "10G-PON published in 2005"
TL;DR: Incorporating wavelength-division multiplexing (WDM) in a PON allows one to support much higher bandwidth compared to the standard PON, which operates in the traditional copper-based networks.
Abstract: Feature Issue on
Optical Access Networks (OAN) The passive optical network (PON) is
an optical fiber based network architecture, which can provide much higher bandwidth
in the access network compared to traditional copper-based networks. Incorporating
wavelength-division multiplexing (WDM) in a PON allows one to support much higher
bandwidth compared to the standard PON, which operates in the "single-wavelength
mode" where one wavelength is used for upstream transmission and a separate one is
used for downstream transmission. We present a comprehensive review of various
aspects of WDM-PONs proposed in the literature. This includes enabling device
technologies for WDM-PONs and network architectures, as well as the corresponding
protocols and services that may be deployed on a WDM-PON. The WDM-PON will become a
revolutionary and scalable broadband access technology that will provide high
bandwidth to end users.
507 citations
TL;DR: A failure location algorithm that aims to locate single and multiple failures in transparent optical networks and can cope with ideal scenarios, as well as with nonideal scenarios having false and/or lost alarms.
Abstract: Fault and attack management has become a very important issue for network operators that are interested to offer a secure and resilient network capable to prevent and localize, as accurately as possible, any failure (fault or attack) that may occur. Hence, an efficient failure location method is needed. To locate failures in opaque optical networks, existing methods which allow monitoring of the optical signal at every regeneration site can be used. However, to the best of our knowledge, no method exists today that performs failure location for transparent optical networks. Such networks are more vulnerable to failures than opaque networks since failures propagate without being isolated due to optoelectronic conversions. In this paper, we present a failure location algorithm that aims to locate single and multiple failures in transparent optical networks. The failure location algorithm developed in this paper can cope with ideal scenarios (i.e., no false and/or lost alarms), as well as with nonideal scenarios having false and/or lost alarms.
167 citations
01 Jan 2005
TL;DR: In this paper, the authors proposed to incorporate wavelength division multiplexing (WDM) in a PON to support much higher bandwidth compared to the standard PON, which operates in the traditional PON.
Abstract: Feature Issue on Optical Access Networks (OAN) The passive optical network (PON) is an optical fiber based network architecture, which can provide much higher bandwidth in the access network compared to traditional copper-based networks. Incorporating wavelength-division multiplexing (WDM) in a PON allows one to support much higher bandwidth compared to the standard PON, which operates in the
164 citations
TL;DR: The purpose of this article is to provide a good understanding of the MAC issue, discuss the major problems involved, and present an overview of the state-of-the-art solutions proposed thus far to the problems.
Abstract: Medium access control is one of the crucial issues in the design of Ethernet passive optical networks. To ensure efficient transmission, an EPON system must employ a MAC mechanism to arbitrate access to the shared medium in order to avoid data collisions in the upstream direction and at the same time efficiently share the upstream transmission bandwidth among all ONUs. The purpose of this article is to provide a good understanding of the MAC issue, discuss the major problems involved (e.g., multiple access, bandwidth allocation, transmission scheduling, and quality of service support), and present an overview of the state-of-the-art solutions proposed thus far to the problems. It is also our purpose to motivate further studies on the problems described in this article
122 citations
TL;DR: It is demonstrated that the light-trail model is one way of efficiently utilizing the optical layer for SAN, providing the mirroring function of SAN systems (multicasting) and consequently lead to reduction in cost.
Abstract: Multiple architectures, technologies, and standards have been proposed for storage area networks, typically in the WAN environment. The transport aspect of storage signifies that optical communications is the key underlying technology. The contemporary SAN over optical network concept uses the optical layer for pure transport with minimal intelligence. This leads to high cost and overprovisioning. Future optical networks, however, can be expected to play a role in optimizing SAN extension into the WAN. An essential characteristic of SAN systems is tight coupling between nodes in a SAN network. Nodes in a SAN system have two critical functions that are presently emulated by data layers and can be offloaded to the optical layer. First, nodes need to signal among each other to achieve tasks such as synchronous and asynchronous storage. Second, to benefit from an optimized network, nodes need to allocate bandwidth dynamically in real time. In this article we show how the optical layer can be furthered from just pure transport to creating opportunities in provisioning as well as providing the mirroring function of SAN systems (multicasting) and consequently lead to reduction in cost. We demonstrate that the light-trail model is one way of efficiently utilizing the optical layer for SAN.
56 citations
TL;DR: A flexible "transceiver + forwarding" edge node architecture is proposed to perform both electronic burst assembly/disassembly and optical burst forwarding, designed to provide class of service and wavelength selection for locally generated bursts, and transparency to cut-through bursts.
Abstract: Optical burst switching has been receiving increased attention as a promising technology for building the next-generation optical Internet. This article presents the design and discusses the implementation of an overlay mode optical burst-switched network testbed. A flexible "transceiver + forwarding" edge node architecture is proposed to perform both electronic burst assembly/disassembly and optical burst forwarding. It is designed to provide class of service and wavelength selection for locally generated bursts, and transparency to cut-through bursts. The functional modules of the control plane and related key design issues are presented. In particular, we discuss a scheduling mechanism that efficiently combines two different contention resolutions in space and wavelength domains. Experimental results show the effectiveness of this scheme in reducing burst blocking probability. Furthermore, the performance of the network testbed and corresponding methods of improving it are discussed.
52 citations
TL;DR: Current optical networking architectures are reviewed and a new concept proposed in A. Gumaste and I. Chlamtac [2003]: light-trails is developed as a novel and amenable control and management solution to address IP-centric communication problems at the optical layer.
Abstract: The Internet transport infrastructure is evolving toward a model of high-speed routers interconnected by intelligent optical networks. In this article we review current optical networking architectures and describe a new concept proposed in A. Gumaste and I. Chlamtac [2003]: light-trails. We develop light-trails as a novel and amenable control and management solution to address IP-centric communication problems at the optical layer. We implement a testbed to demonstrate light-trail feasibility. We also present three medium access control protocols for light-trails and evaluate their performance. The goal of light-trails and our solution is to combine commercially available components with emerging network technologies to provide a transparent, reliable, and highly scalable communication network.
40 citations
27 Dec 2005
TL;DR: This paper investigates the availability of optical connections with respect to the failure probability of the involved network components in terms of map diagrams which allow to determine a wavelength connection subject to the transmission distance and the number of traversed hops.
Abstract: The provisioning of services in optical networks demands reliable transmission paths. This paper investigates the availability of optical connections with respect to the failure probability of the involved network components. Outages of the fiber links as well as potential hardware failures for different opaque and transparent node architectures are analyzed. The results are presented in terms of map diagrams which allow to determine the availability of a wavelength connection subject to the transmission distance and the number of traversed hops.
35 citations
Patent•
23 Mar 2005TL;DR: In this article, a method and apparatus for low cost upgrading on demand of an optical fiber communication system without installing additional optical fiber and minimal installation of optical circuitry at destination and distribution terminals is presented.
Abstract: A method and apparatus for low cost upgrading on demand of an optical fiber communication system without installing additional optical fiber and minimal installation of optical circuitry at destination and distribution terminals. The upgraded systems comprise an optical data loop of a plurality of destination terminals and a single intermediate terminal.
32 citations
TL;DR: An overview of the control plane for optical transport networks and a critical survey of current and new transport technologies in optical core and metropolitan networks is given, including SDH/SONET and its enhancements, OTN, RPR, and Ethernet.
01 Jan 2005
TL;DR: The network cost of EPON and GPON is studied and bases the comparison on the link utilization to determine which one to choose when establishing a new access network.
Abstract: Optical transmission is getting more popular in the access network due to the increasing demand for bandwidth. The most advertised transport solutions for the optical access are Ethernet based PON (EPON) and gigabit-capable PON (GPON), and the problem is which one to choose when establishing a new access network. This paper studies the network cost of EPON and GPON and bases the comparison on the link utilization.
01 Jan 2005
TL;DR: This work investigated the performance of light-trails via theory, simulation and experiment focusing on its efficiency, and found it to be a promising candidate for grooming of traffic in the optical layer.
Abstract: Light-trails are a promising candidate for grooming of traffic in the optical layer. We investigated the performance of light-trails via theory, simulation and experiment focusing on its efficiency. (2 pages)
21 Sep 2005
TL;DR: A new network availability algorithm (NAA), which considers the high network performance, for WDM optical networks is proposed and simulation results show that NAA not only is correct but also is efficient.
Abstract: As the need of network users for high-availability increase, how to evaluate the network availability justly becomes an on edge problem. Under the dynamic connections, a new network availability algorithm (NAA), which considers the high network performance, for WDM optical networks is proposed. It is practically to the users and operators of the network. Simulation results show that NAA not only is correct but also is efficient
TL;DR: In this article, a self-protected architecture for Ethernet passive optical networks is proposed, where the protection of the traffic transported between the central office and customer terminals against feeder fibre cable breaks is carried out by switching and overlaying the disrupted transmission channels onto a separate Ethernet Passive Optical Network using waveband separation.
Abstract: Proposed and experimentally demonstrated is a novel self-protected architecture for Ethernet passive optical networks. The protection of the traffic transported between the central office and customer terminals against feeder fibre cable breaks is carried out by switching and overlaying the disrupted transmission channels onto a separate Ethernet passive optical network using waveband separation.
TL;DR: A systematic adaptive scheduling scheme to enhance the functions of the IPACT on both types of scheduling in order to achieve efficient bandwidth utilization of EPONs under unbalanced traffic and to provide class-of-service or differentiated services within an ONU.
Abstract: Feature Issue on Optical Access Networks (OAN) The Ethernet passive optical
network (EPON) is a technology viewed as an attractive solution to the "last mile"
problem. The interleaved polling with adaptive cycle time (IPACT) is a remarkable medium
access control (MAC) protocol for EPONs. The IPACT scheme supports two stages of
scheduling. One is inter-optical network unit (ONU) scheduling. The other is intra-ONU
scheduling. In this paper, we propose a systematic adaptive scheduling scheme to enhance
the functions of the IPACT on both types of scheduling in order to achieve efficient
bandwidth utilization of EPONs under unbalanced traffic and to provide class-of-service
(COS) or differentiated services within an ONU. The simulation results show that our
proposed scheduling scheme can improve the performance of the EPON system under
unbalanced traffic loads and provide fair bandwidth allocation of the uplink to
different types of traffic.
16 May 2005
TL;DR: This paper proposes a new re-provisioning algorithm to improve the restorability of shared optical networks and compares its performance with a conventional scheme and demonstrates the effectiveness of the proposed approach in improving optical network Restorability with and without wavelength conversion.
Abstract: A key means for improving service availability in optical networks is the ability to recover from dual near-simultaneous failures. To date, most studies have focused on improving survivability for single failure events either via proactive or reactive mechanisms. Conversely, lightpath re-provisioning has only recently been considered as an alternative for improving overall network restorability in the event of dual failures. Here, post-failure re-provisioning establishes new backup capacities for unprotected connections in advance of a second failure. In this paper we propose a new re-provisioning algorithm to improve the restorability of shared optical networks and compare its performance with a conventional scheme. Namely, the proposed algorithm only requires re-provisioning of a fraction of unprotected connections, since upon re-routing onto shared backup capacity, some connections are only in a "temporarily unprotected" state. Through simulation analysis, we demonstrate the effectiveness of the proposed approach in improving optical network restorability with and without wavelength conversion.
TL;DR: In this article, the authors describe the main features of an optical burst switched (OBS) network, its benefits as well as its challenges, and propose an all-optical architecture for the next generation Internet.
Abstract: Demands for network bandwidth increase daily. In order to meet our ever-increasing network bandwidth needs, one solution is to design and build the next generation Internet with an optical core infrastructure, with last connection provisioning time and unprecedented high data rates of 100 terabits per second and higher. An optical network is built by interconnecting various optical switches with wavelength-division multiplexing (WDM) fibers, i.e., fibers that can simultaneously transmit data over different wavelengths. Many of today's commercial optical networks, however, do not utilize the WDM technology efficiently. With respect to the current state of the technology, an Optical Burst Switched (OBS) Network is one of the most promising all-optical architectures for the next generation Internet. It efficiently supports the transmission of bursty traffic over an all-optical infrastructure. OBS is still being developed and it has not been standardized yet. This article describes the main features of an OBS network, its benefits as well as its challenges.
TL;DR: The article describes the global test network, services, architecture, and overall test approach, and describes innovations made to the optical control plane to handle multilayer signaling and lists further refinements needed to make these services operational.
Abstract: This article describes the 2005 Worldwide Interoperability Demonstration held by the Optical Internetworking Forum and showcased during SUPERCOMM 2005, The event highlighted Ethernet services transported over intelligent optical networks, using equipment from 13 of the industry's leading vendors located in seven carrier laboratory facilities around the world. The demonstration utilized a distributed optical control plane based on OIF Implementation Agreements to control a multilayer network providing Ethernet over SONET/SDH adaptation and transport. The article describes the global test network, services, architecture, and overall test approach. It also describes innovations made to the optical control plane to handle multilayer signaling and lists further refinements needed to make these services operational.
TL;DR: Verizon's experience with deploying metro Ethernet services and some of the laboratory activities related to the convergence of layer 2/1 networks are presented, including service logic and policy that controls the admission, path selection, and transport bandwidth adjustment requirements of provisioning an Ethernet virtual connection within the metro Ethernet network.
Abstract: This article presents Verizon's experience with deploying metro Ethernet services and some of our laboratory activities related to the convergence of layer 2/1 networks. Such convergence leverages the existing SONET and optical transport network infrastructure, and integrates layer 1 and layer 2 transport, control, and management planes within the network. Integrated service provisioning is featured, including service logic and policy that controls the admission, path selection, and transport bandwidth adjustment requirements of provisioning an Ethernet virtual connection within the metro Ethernet network.
Dissertation•
01 Jan 2005
TL;DR: The access control mechanism should be centralized and performed by the Optical Line Terminal (OLT) and it is shown that this approach can give greater flexibility to adjust to changing traffic conditions, can simplify the structure of the Optical Network Units, and can allow the easy adoption of Service Level Agreements.
Abstract: Fiber based access networks can deliver performance that can support the increasing demands for high speed connections One of the new technologies that has emerged in recent years is Ethernet Passive Optical Networks The key features of this approach are the simplicity of the architecture and compatibility with existing Ethernet based local area networks
To make Ethernet Passive Optical Networks (EPONs) a fully functional part of the telecommunication system, support for classes of traffic with different Quality of Service (QoS) requirements is mandatory Much research has been done on the optimal bandwidth allocation algorithms that would have the capability of supporting Differentiated Services (DiffServ) in EPONs
This thesis proposes that the access control mechanism should be centralized and performed by the Optical Line Terminal (OLT) It is shown that this approach can give greater flexibility to adjust to changing traffic conditions, can simplify the structure of the Optical Network Units, and can allow the easy adoption of Service Level Agreements
This thesis introduces a novel EPON simulator that allows testing of various types of bandwidth allocation algorithms It is possible to evaluate the allocation mechanism under different traffic conditions and with network configurations that closely resemble real systems
New algorithms are presented based on a paradigm of centralized access control Simulation results showed that they offer good performance and support for the DiffServ architecture
06 Mar 2005
TL;DR: This work proposes dual service-level agreements (SLAs) to enforce fairness in open access EPON and calls for further studies on how these agreements should be structured and enforced.
Abstract: "Open access" is a regulatory requirement in many countries mandating that the residential access network infrastructure be competitively available to service providers. We propose dual service-level agreements (SLAs) to enforce fairness in open access EPON.
Patent•
10 Mar 2005TL;DR: In this paper, the enhancement band is used to carry a unidirectional baseband Ethernet signal, such as Gigabit Ethernet, in the optical domain to all or a subset of subscriber premises to carry broadband services from a video on demand distribution facility.
Abstract: In optical telecommunications networks using passive optical networks (PON), an optical wavelength band called the enhancement band (1539 to 1565 nm) is typically used to carry broadcast video signals in either analog television or QAM Digital Video form. This enhancement band is used here to carry a unidirectional baseband Ethernet signal, such as Gigabit Ethernet, in the optical domain to all or a subset of subscriber premises to carry broadband services from, for instance, a video on demand distribution facility. This results in a network with all digital baseband signaling and simplifies the network architecture so as to be all Internet Protocol and/or all Ethernet compatible.
06 Mar 2005
TL;DR: This work investigates the scheduling algorithms with quality of service support for a novel optical access network, the SUCCESS-DWA PON, and shows that the high-priority traffic exhibits good packet delay performance in the proposed scheduling algorithm.
Abstract: We investigate the scheduling algorithms with quality of service support for a novel optical access network, the SUCCESS-DWA PON. Results show that the high-priority traffic exhibits good packet delay performance in the proposed scheduling algorithm.
23 Feb 2005
TL;DR: This paper presents the Optical Networks Research Laboratory's Gigabit Ethernet fiberoptic network test-bed, and demonstrates the steps taken to install and configure an operational survivable virtual private network (VPN) service built over the ONRL metro-testbed.
Abstract: In this paper, we present the Optical Networks Research Laboratory (ONRL) Gigabit Ethernet fiberoptic network test-bed. Using this testbed, we consider two cases of provisioning secure and reliable connections for geographically disperse customer-based VLANs over a publicly shared network: 1) using Stacked VLANs (SVLAN) and 2) using L2-VPNs over IP/MPLS core network. We demonstrate the steps taken to install and configure an operational survivable virtual private network (VPN) service built over the ONRL metro-testbed. Finally, we present results of experiments conducted to study the protection and restoration schemes implemented using the previously mentioned scenarios.
01 Jan 2005
TL;DR: The gigabit Ethernet passive optical network (GE-PON) is a high-speed optical access method that has been standardized according to IEEE 802.3ah and is attracting attention as some operators have started to provide optical access service with it.
Abstract: The gigabit Ethernet passive optical network (GE-PON) is a high-speed optical access method that has been standardized according to IEEE 802.3ah and is attracting attention as some operators have started to provide optical access service with it. NTT Access Network Service Systems Laboratories has developed a GE-PON system that should capture a major share of the FTTH (fiber to the home) market, which is expected to become very competitive in the near future.
IBM1
TL;DR: In this article, the need for optical interconnects inside future high performance servers is considered, and the most promising and economical technology for these applications is discussed. And possible implementations are discussed.
Abstract: The need for optical interconnects inside future high performance servers is considered. Multimode parallel optical links are the most promising and economical technology for these applications. Possible implementations are discussed.
01 Jan 2005
TL;DR: This dialogue aims at exchanging relevant information from monitoring the performance and degradation of optical signals with minimal disturbance to the optical services and minimum knowledge of the transport history of data, with a view to ensure service quality.
Abstract: This paper focuses on the design and implementation of a low-complexity dialogue mechanism between the management and transport planes of an all-optical network. This dialogue aims at exchanging relevant information from monitoring the performance and degradation of optical signals with minimal disturbance to the optical services and minimum knowledge of the transport history of data, with a view to ensure service quality. Complexity of the dialogue is measured in terms of response delays in the event of failures.
06 Mar 2005
TL;DR: This paper presents a performance analysis approach for OCDMA networks, which takes into account both the physical layer characteristics and random media access schemes and demonstrates its effectiveness in characterizing the OCDMA network dynamics.
Abstract: This paper presents a performance analysis approach for OCDMA networks, which takes into account both the physical layer characteristics and random media access schemes. Analysis results demonstrate its effectiveness in characterizing the OCDMA network dynamics.
03 Jul 2005
TL;DR: The presentation will outline resent research advancements towards the realization of digital optical networks and will present some key activities undertaken within the framework of COST 291 project.
Abstract: Technical breakthroughs in optical communications research are expected to further accelerate the realization of transparent optical networks to offer increased transmission bandwidth, integrated transmission and switching capabilities and optical signal processing functionality. This progress provides scalable, transparent and flexible end-to-end solutions in the metropolitan and access networks. These advanced optical network infrastructures will enable accessibility of new services and applications to the end user offering full access to the global information network with improved system performance and reduced cost. The primary objective of the EU COST 291 action "Towards Digital Optical Networks" is to focus on novel network concepts and architectures exploiting the features and properties of photonic technologies, to enable future telecommunications networks. It is aiming to propose a new generation of optical systems and networks that will accommodate the unpredictable and growing size of traffic demands over global distances requiring an agile communication grid supporting quality of services. This advanced photonic infrastructure will employ dense wavelength division multiplexing technologies for signal transmission and routing, optical signal processing and dynamic impairment management to eliminate the limitations of the analogue nature of traditional optical networks, and optical packet and/or burst switching to provide fine bandwidth granularity, network efficiency and flexibility. The presentation will outline resent research advancements towards the realization of digital optical networks and will present some key activities undertaken within the framework of COST 291 project.