Showing papers on "10G-PON published in 1998"

Architectures and technologies for high-speed optical data networks

Abstract: Current optical networks are migrating to wavelength division multiplexing (WDM)-based fiber transport between traditional electronic multiplexers/demultiplexers, routers, and switches. Passive optical add-drop WDM networks have emerged but an optical data network that makes full use of the technologies of dynamic optical routing and switching exists only in experimental test-beds. This paper discusses architecture and technology issues for the design of high performance optical data networks with two classes of technologies, WDM and time division multiplexing (TDM). The WDM network architecture presented stresses WDM aware Internet protocol (IP), taking full advantage of optical reconfiguration, optical protection and restoration, traffic grooming to minimize electronics costs, and optical flow-switching for large transactions. Special attention is paid to the access network where innovative approaches to architecture may have a significant cost benefit. In the more distant future, ultrahigh-speed optical TDM networks, operating at single stream data rates of 100 Gb/s, may offer unique advantages over WDM networks. These advantages may include the ability to provide integrated services to high-end users, multiple quality-of-service (QoS) levels, and truly flexible bandwidth-on-demand. The paper gives an overview of an ultrahigh-speed TDM network architecture and describes recent key technology developments such as high-speed sources, switches, buffers, and rate converters.

Optical subscriber network system

Abstract: In an optical subscriber network system which connects plural optical network units to an optical service unit using passive optical elements through an optical transmission line, the optical transmission line is duplexed with a lower cost. The optical service unit and the optical network units each have plural transmission-reception portions the wavelengths of which are different from each other, and the inputs and outputs of the plural transmission-reception portions are multiplexed with the wavelengths (WDM) into a single optical transmission line to form a pseudo redundant communication path between the optical service unit and the optical network units. The communication which uses a certain wavelength between the optical service unit and the optical network units is active, and the communication which uses another wavelength is a standby. When the active communication has a fault, a switchover operation to the standby communication is performed. The communication path using plural wavelengths between the optical service unit and the optical network units can select either the function of “with redundancy” or “without redundancy” or “enhanced line speed”, depending on subscribers' demands.

A novel optical-path supervisory scheme for optical cross connects in all-optical transport networks

Abstract: We propose and demonstrate a novel and effective supervisory scheme to monitor the optical-path routing at the optical cross connects in all-optical transport networks. Any error in optical-path routing due to failure in the cross connect can be detected without tapping off the power at the data wavelengths, and no dedicated monitoring light source is required. The scheme supports in-service surveillance. It can facilitate the network management in the optical layer of all-optical and reconfigurable transport networks.

Photonic transport network architecture and OA&M technologies to create large-scale robust networks

Abstract: In order to realize a large-scale and robust photonic transport network, a network protection strategy and operation, administration, and management (OA&M) realization scheme in wavelength division multiplexing optical path (WDM OP) transport networks has been developed. This paper discusses the networking (restoration/protection) concepts in each optical layer and proposes the most suitable networking strategy. To develop the OA&M technique, the characteristic information format of each optical layer must be discerned. A network node interface (NNI) structure for the WDM OP transport network is proposed. The proposed NNI is defined as the optical transport module (OTM). An OP signal format is defined as the optical transport unit (OTU). Overhead information and schemes to transmit it are also discussed.

Spectral slicing in WDM passive optical networks for local access

Abstract: Spectral slicing techniques can support point-to-point, point-to-multipoint, and multiple access applications in the local access network. With spectral allocation it enables operation of multiple independent networks on a common infrastructure, with partitioning of both services and quality of service.

Switchless optical network for advanced transport architecture

Abstract: The main objective of the SONATA project, within the European Union ACTS programme, is to define and demonstrate a single-layer network platform for end-to-end optical connections between a large number of network terminals, including both business and residential customer terminals. The "switchless" network concept was originally proposed to provide all customer connections within a national-scale, all-optical network, simply by employing time and wavelength agility at the network terminals (WDMA/TDMA). This paper describes the work underway in ACTS SONATA to demonstrate the concept and further define it in terms of network control, management and interfacing issues, as well as further physical impairments.

Approaches to multiple service delivery over passive optical networks

Abstract: Summary form only given. From the earliest descriptions of passive optical networks (PONs), the idea of using the tremendous bandwidth of optical fiber to provide diverse services has been advocated, and using wavelength-division multiplexing (WDM) was suggested early and more formally proposed a few years ago. In such a system, passive power splitters are used to convey multiplexed information between the headend or Central Office (CO) and the subscribers. Early subscribers, and those declining more advanced services, operate in one region of the optical spectrum, while other regions of the optical spectrum are reserved for more advanced services in the future. We propose a modest generalization of this view by identifying the different services as being provided by different providers. That is, different service providers use different regions of the optical spectrum, sharing the same physical network but operating with distinct services and even distinct terminal equipment.

Optimum protection architecture for reliable dense-WDM lightwave networks

Abstract: This paper examines reliable and economical wavelength-division-multiplexed trunk-network protection architectures. Protection architectures for lightwave networks are classified as path/link switching type or dedicated/shared standby-resources type. The required number of optical links for each protection-architecture is calculated and compared in terms of the number of wavelengths, demand patterns, and several network topologies. The results show that the path-dedicated protection architecture, which enables fast protection, is pretty cost-effective for a typical regional network when the number of wavelengths is more than ten. Dense-WDM technologies will replace the economical and reliable protection-architecture from the ordinary link-shared protection to the path-dedicated protection.

The architecture of full services access network

Abstract: Summary form only given. An international idea the full services access network (FSAN)-to create the conditions for the development and the introduction of access systems supporting a full range of narrow-band and broadband services is presented. Although it is recognized that the needs of each network operator differ because of the differing regulatory, business, and structural environments in each country, sufficient similarities exist in the needs for future access networks to suggest that significant benefits can be achieved through adopting a common set of requirements specification.

Optimized design of wdm network architectures

Abstract: In recent years, there has been an explosive growth of the Internet in terms of (a) user population, (b) geographical coverage, and (c) carried traffic. To accommodate the increasing number of end-users who require large bandwidth, the Internet infrastructure needs to be scalable, i.e., able to accommodate traffic growth without significant changes to its existing operation. Optical networks based on wavelength-division multiplexing (WDM) technology offer the promise to satisfy the bandwidth requirements of the Internet infrastructure, and provide a scalable solution to support the bandwidth needs of future applications in the local and wide areas. This dissertation examines the optimized design and performance analysis of survivable WDM optical networks, and proposes new WDM-based network architectures. In a WDM optical network, the routing scheme employed to route optical channels has a significant impact on the network performance. An approximate analytical model for fixed-alternate routing that incorporates sparse wavelength conversion is developed for estimating different network performance parameters. The failure of network elements (e.g., fiber links, cross-connects, etc.) in a WDM optical network may cause the failure of several optical channels, thereby leading to large data losses. Several approaches based on protection/restoration are examined to protect mesh-based optical networks from single-link failures. Distributed control algorithms are proposed for restoring optical channels after a link failure. A new network architecture called Wavelength Distributed Data Interface (WDDI) is proposed. This architecture enhances a fiber-optic ring network, such as FDDI, to operate over multiple wavelengths on its existing fiber plant consisting of point-to-point fiber links. In this architecture, network nodes can be partitioned to operate over multiple subnetworks, with each subnetwork operating independently on a different wavelength, and inter-subnetwork traffic forwarding performed by a bridge. The architecture of WDDI nodes and bridges are investigated, and algorithms are proposed for optimally partitioning nodes into subnetworks. The design of a WDM-based wide-area optical network that can support packet-switched traffic is investigated. Such a wide-area optical network can significantly enhance the capabilities and capacity of a packet-switched backbone network. The optimized network-design problem is formulated, and heuristic algorithms are developed for its solution.

Requirements for low-cost optical components for the full services access network

Abstract: Summary form only given. The large-scale deployment of full services access networks (FSANs) can only come to reality if its cost can be low enough. The aim of the FSAN initiative is to establish a set of standard specifications in order to foster volume production of optical equipment and thereby lower its costs. The chosen PON architecture yields a favorable economy for the infrastructure shared costs, with the needed broadband capability.

What architectures make sense for fiber access networks

Abstract: A variety of access architectures have been examined. When DWDM is introduced, it is likely to first be used in the downstream direction only. For residential access, providing broadcast video, along with high-speed data, may provide the additional revenue necessary to justify deployment of optical systems. If so, integrating the broadcast video and data together into a single system seems to be the most cost-effective approach.

HDWDM up-grading in CATV networks

Abstract: The upgrade proposed by TOBASCO for CATV networks towards Full Services Access Networks is presented using flexible multi-wavelength techniques, as well as results of the field trial in Gent, Belgium.

Optical networks in the real world

Abstract: Current optical transmission systems (currently based on the SONET or SDH standards in particular) provide many features that aid an operator in determining system performance, system status, and help to isolate faults. As the need for data transmission is growing rapidly in the network, the desire to transport Internet Protocol (IP) frames over optical systems arises, in addition to traditional time division multiplexed (TDM) telephony voice and data signals.

WDM networking on a European scale

Abstract: Four different topological approaches to designing a pan-European optical network are discussed. For such an ultra-high capacity large-scale network, it is necessary to overcome physical path length limitations and to limit optical cross-connect (OXC) complexity.

Functional architecture and information models for the management of optical networks

Abstract: This paper addresses the management of photonic networks. It presents the first achievements of the ACTS-MEPHISTO project. The project's general objective is to extend the principles of network management (TMN) to generic all-optical networks, in which wavelength division multiplexing (WDM) will be implemented far transmission and routing. This includes the development of information models for optical networks and network elements, of management applications and test platforms to demonstrate fault, configuration and performance management of optical networks, and the promotion of the developed models within ACTS and standardisation bodies. The functional architecture and early information models for the management of optical networks and network elements are described.

High-speed digital optical networking

Abstract: Photonic interconnection fabrics are now being introduced to allow greater information carrying speed and capacity and to reduce complexity. Ideally, these optical interconnection systems would emulate the advantageous features of electronic systems: modularity, cascadability, scalability and freedom from architectural constraints. However the first generations of photonic networks (based on 'transparent' wavelength routing or optical time-division multiplexing (OTDM)) fall far short of this ideal.

OAM&P technologies for optical networking

Abstract: Summary form only given. In order to manage and control an optical network based on wavelength division multiplexing (WDM) technologies, efficient and economic operations are critical issues. New operations, administration, maintenance, and provisioning (OAM and P) approaches and related technologies need to be developed before all optical networking can be fully realized. This paper examines the network management aspects of optical networks and discusses the functional modeling and the information modeling of managing this new transport network.

Network element and network level parameters for the management of optical networks

Abstract: From the functional architecture of optical network elements, parameters for fault and performance management are proposed for network element-level management. At the network level, some parameters are considered to assess the performance of end-to-end channel trails.

POF for high-speed PC and home networks

Abstract: Summary form only given. This paper reviews the recently developed key technologies for high speed plastic optical fibre (POF) links up to 2.5 Gbps. Based on these key technologies, several high-speed POF networks, such as ATM LAN, Fast Ethernet, and IEEE1394 home networks, are introduced. The plastic optical fiber originally developed by DuPont in 1968 had a step index profile, and this technology is the most mature.

First prototype of bi-directional EDFA for single fiber tree-and-branch access networks carrying AM-VSB and digital multiwavelength signals

Abstract: Summary form only given. Optical fiber is penetrating rapidly in subscriber access networks for distribution of community antenna television (CATV) services. Today's CATV head-end stations are feeding distributive services to large numbers of subscribers (>10,000) in networks with abundant splitting in the fiber part as well as in the coaxial part. The ACTS project TOBASCO (Towards Broadband Access Systems for CATV Optical networks) is exploring ways to upgrade existing fiber-coax CATV networks to implement such interactive services by developing HDWDM techniques and optical bi-directional amplifiers. We present the design and performances of a bi-directional multiwavelength TWOBA (two wavelength optical branching amplifier) used to compensate the propagation and the splitting losses along the link for bi-directional digital interactive signals and downstream analogue CATV signal.

Secure and bandwidth-on-demand full-service access network

Abstract: We propose a secure and bandwidth-on-demand full-service access network that can be implemented with the existing hybrid fiber coaxial networks. Preliminary experimental results of half-duplex transmission with flexible bandwidth partitioning between upstream and downstream using integrated coherent transceivers are demonstrated.