Showing papers on "10G-PON published in 1996"

Optical networking update

Abstract: This paper presents an inventory of the current state and future prospects for networks in which signal paths between end user nodes remain entirely in optical form without intervening electronic conversions. The emphasis is on wavelength-division multiplexing (WDM). The applications and system aspects are stressed relative to details of the supporting technologies. The case to be made for optical networks as the basis of an entire possible future generation of networking is examined, after which the various architectural choices are discussed. Next, the limits on what can be achieved, mostly arising from limitations within the available technology, are treated. After a review of the history of all-optical networking, the paper concludes with speculations about where the applications, the technology and the architectural character of these systems will be going in the years ahead.

Results from the COST 239 project. Ultra-High Capacity Optical Transmission Networks

Abstract: The objective of COST 239 (Ultra-High Capacity Optical Transmission Networks) is to evaluate the feasibility of an optical overlay network interconnecting major cities within Europe. This European Optical Network employs wavelength routing to provide the required interconnection between network nodes. The study has a number of key activities and achievements relating to traffic modelling, transmission, network topologies and dimensioning, and protection strategies. In this paper the emphasis is on network rather than transmission aspects.

Local access optical networks

Abstract: Both broadcast CATV and switched telephony access networks have evolved, over decades, to deliver their respective services efficiently. But these networks are not necessarily optimal for services that are rapidly emerging. This suggests that the access infrastructure will likely change in the future, driven by demands for new services and the costs of providing them. Will fiber optic networks play an important role? Trade-offs in desirable network properties (low initial costs, high capacity, flexible provisioning, enhanced maintenance and operations, etc.) are strongly influenced by the network architecture. We classify architectures on two characteristics: delivery mode (i.e., broadcast vs. switched) and carrier utilization (i.e., shared vs. dedicated), examining the trade-offs these imply with several examples of existing and proposed architectures. We show that optical networks can, by virtue of recent component development, be reconfigured to change their characteristics without changing the outside plant.

The super-PON concept and its technical challenges

Abstract: This paper describes the architecture and the technical challenges for the design of a large-split and long-range Passive Optical Network (PON) intended for Fiber-To-The-Home (FTTH) deployment. The system, called Super-PON, can support a splitting factor of 1024 (or more but with a more complex and hence costly implementation) and a range of 100 km. The overall network capacity is 2.5 Gbps TDM downstream and 300 Mbps ATM-based TDMA upstream. As compared with already designed PON systems, the proposed Super-PON requires the introduction of optical amplifiers along the fiber paths. The presence of these optical amplifiers brings new technical challenges especially for burst mode amplification in the upstream direction of transmission. Analysis and potential solutions to solve these problems while allowing further capacity upgrades using WDM/VDMA techniques are described in this paper along with a discussion of network survivability issues.

Operations and management of WDM optical networks

Abstract: This paper describes some of the key challenges of managing and controlling a large-scale WDM transport network, including the implications for hardware design and inter-operability requirements.

Passive Optical Networks in the Local Loop

Abstract: The author reviews the motivation for passive optical networks as a delivery system for services in the Local Loop, the “last mile” in the communication link. He then argues that new developments in WDM components motivate a re-examination of wavelengthdivision-multiplexing (WDM) PONs as a distribution network.

Cost benefits and business opportunities of high capacity optical broadband access network upgrade technologies

Abstract: The paper presents a techno-economic assessment of optical access network upgrade technologies for subscribers with high capacity demands. The major contribution is an in-depth analysis of expected cost benefits and business opportunities of optical broadband alternatives in the mixed residential and business market. The study focused on physical layer upgrades, and examined the installed first costs of upgrading the typical one-way point-to-point fibre connection of current large business customers to higher capacity with a two-way connection for protection, as well as introducing broadband passive optical networks for 2 Mbit/s subscribers.

40 Gbit/s optical TDMA LAN

Abstract: We demonstrate an optical TDMA LAN with 40 Gbit/s capacity, which is being used to interconnect high-end computer workstations The entire LAN requires only one optical pulse source, and uses very few components at each node to read and write data

HDWDM upgrade of CATV fibre-coax networks for broadband interactive services

Abstract: To introduce broadband interactive services in a fibre-coax CATV network with high splitting ratio, a HDWDM upgrading strategy in combination with conventional TDMA (or SCMA) techniques is presented It features flexible network reconfiguration via wavelength reassignment at the optical network units Key system item is a novel cost-effective bi-directional erbium-doped fibre (/planar waveguide) amplifier handling simultaneously a high-grade analogue CATV downstream signal and multiwavelength interactive signals in a single fibre-coax network

Broadband passive optical network media access control protocols

Abstract: Most telecommunication operators are currently deciding on how to respond to customers' needs stimulated by the synergy between compression coding of multimedia and the emergence of broadband digital networks. This paper describes a range of broadband access architectures under consideration in the full services access network initiative. All architectures have a common requirement for a broadband ATM PON. A common broadband PON applicable to many operators increases the world-wide market for the product. With greater production volumes manufacturers' costs reduce because of the experience curve effect making broadband access systems economic.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Recent progress in optical access networks

Abstract: Summary form only given Because local loop distribution systems must be reliable, robust, and inexpensive, early passive optical network (PON) proposals emphasized broadcast architectures These networks employ existing technology in a cost-effective manner and enable fiber to be deployed early Concerns about ultimate capacity and network operations prompted wavelength-division multiplexing (WDM) PONs to be proposed and demonstrated shortly thereafter Perceived component costs made implementation unrealistic Recently, however, component and architecture research has re-opened WDM as a possible access strategy

The emerging shape of optical networks: a European perspective

Abstract: The first steps to introduce optical networks have already been taken, with amplified WDM systems available commercially and trials under way By exploiting the inherent characteristics of photonics we should expect progressive increase of network capacity and functional capability yet with costs remaining the same or even falling But what are the features that will make them friendly and attractive to the operator and user? Manageability, the versatility to support bandwidth hungry services and the ability to grow organically will all influence the emerging shape of optical networks A European perspective will be taken

InP-based photonic integrated circuits for future optical access networks

Abstract: Thanks to the sharing of the infrastructure and the central equipment's between several customers, it is now well recognised that the optical fiber could be economically introduced in the network access with a passive optical network (PON) architecture. However, fiber penetration is presently limited by the excessive cost of the optical network unit (ONU) installed in the private customer premise. As the optical part of the ONU is one of the major component in the total cost, breakthroughs in existing technologies are urgently needed to fabricate these optical modules at very low cost. Hybrid integration of optoelectronic components on planar lightwave circuit is the proposed solution to reduced the optical module cost at short term. However, the monolithic integration of these components on a common InP substrate could lead to further cost decrease thanks to its very large volume production capabilities. So the aim of this paper is to review recent achievements of InP-based photonic integrated circuits (PIC's) for optical access network and to demonstrate their interest for cost reduction in the medium term.

A systematic evaluation on burst-mode data transmission in passive optical access network

Abstract: In an optical subscriber loop that utilizes TDMA (time division multiple access) technology with a single mode fiber, the data from subscribers are in burst-mode. While transmitting the burst-mode data there are penalties in the optical link budget: timing jitter in the recovered data stream and the loss of the header in the subscribers' data stream cause poor transmission performance. In this paper, the technical issues for burst-mode data transmission in the access passive optical network (PON) are discussed, and through systematic evaluation results, it is experimentally demonstrated that transmission is effective in an access PON with a 17 dB budget and good BER performance.

Multiwavelength optical network activities in the US

Abstract: Summary form only given, as follows Wavelength-division-multiplexed (WDM) transmission systems, made economically viable by the fiber amplifier, are now being deployed in the United States by both local and long distance service providers While initial deployment has been justified solely by the increased capacity needs of point-to-point links that use embedded, standard fiber, WDM also offers the potential of high-level transport networking functions including wavelength add/drop and cross-connection to provide rapid restoration, service provisioning and reconfigurable private networks This talk reviews the efforts in the US to evaluate the value and economic and technical viability of such optical networks with particular emphasis on the Multiwavelength Optical Networking (MONET) consortium project

Broadband optical access network: cooperative work among European PNOs

Abstract: The paper reports on the main outcomes of project EURESCOM P413 Task 2 "Optical networking in the local loop", highlighting the common understanding of European Public Network Operators (PNOs) on fibre based access network architectures for residential and business customers in a multiservice scenario The results of this study encompass introduction guidelines, modelling methodologies, economic appraisal of technical alternatives and key issues for standardization

LARNet, a Wavelength Division Multiplexed Network for Broadband Local Access

Abstract: We present a wavelength division multiplexed (WDM) network architecture for local access that provides broadband switched services. A central office (CO) is connected to multiple optical network units (ONU) through a shared access fiber and a passive router in a remote node (RN). A single multifrequency laser (MFL) in the CO sends data simultaneously on all wavelengths; spectral slicing and a WDM receiver is employed for upstream connectivity. The WDM layout ensures independent virtual point-to-point links up-and downstream; expensive components are shared among all ONUs; and the wavelength control problem becomes very simple. The ONU is built with inexpensive commercially available components. Aggregate rates of several Gbps downstream and several hundred Mbps upstream can be realized.

The multiwavelength optical networking program (MONET)

Abstract: This paper presents an overview of the Multiwavelength Optical NETworking program (MONET) including networking demonstrations and major research thrusts. The objective is to integrate research on network architectures, advanced technology, and network management with business drivers to demonstrate the viability of high capacity, cost effective, reliable, transparent multiwavelength networks that can be commercially viable in the context of both commercial and DoD applications.

Application of WDM in local exchange networks

Abstract: Summary form only given. Multiwavelength optical layer networking can enable a network operator to add and rearrange high-capacity links dynamically, making more efficient use of network resources. Transparent switching would allow the same network to support signals with a variety of rates and formats, also resulting in capital and operations savings. The added capacity that WDM provides may also be used to provide more cost-effective service restoration from fiber cuts. To make this happen, network control and management capabilities are equal in importance to hardware technology capabilities and equipment costs.

ATM-based optical access network toward multimedia era

Abstract: This paper proposes an ATM-PON based optical access network architecture and relevant transmission technologies for providing multiple services. The motivation of this network is to realize a service platform and to provide multimedia services as well as POTS and ISDN to both businesses and homes. This paper also describes how the PON architecture will contribute to greater network economy, a smooth evolution from the narrow-band optical access network, and downsizing of the optical network unit (ONU). It also shows the configuration, system parameters, features of the system, hardware, and the experimental results. This ATM-PON system is actually working as a service platform for VOD experiments in our laboratory; more than ten types of servers and settop devices are currently connected. This system is to be used for multimedia experiments in a field environment.

Supporting digital video broadcast on optical access networks

Abstract: FITL networks are characterised by the introduction of optical fibre in the access network, up to a certain point where the end users can be reached using standard telephony twisted pair carrying all services. The fibre penetration level (i.e. low for to the home the fibre is reaching) is determined by the available loop technology at the time of deployment, the service mix and take ratio, and of course the cost of the network, not only equipment cost, but also the installation and operational cost. With today's emerging technologies, fibre-to-the curb access networks are becoming feasible and economically justifiable, even for moderate penetration of high bit rate services. A general characteristic of these networks is that the last copper drop, between the optical network termination and the subscriber house, has to use the existing cabling for delivering POTS or NISDN services. The access network will in this way be upgraded to deliver video and other ATM based services to the subscriber.

National scale optical networking: the MONET long-distance testbed

Abstract: Wavalength-division multiplexed (WDM) transmission has become the clear choice for systems with capacities of tens of Gb/s per fiber. Given that WDM is used, it becomes attractive to consider the advantages that may arise from routing wavelengths between nodes without the use of electronic switches. Thus an optical network should require internodal capacities on the order of tens of Gb/s, or more if there are multiple fibers between nodes. The interexchange network of the United States is one of the few examples of such a network, and is likely to be one of the best opportunities for application of optical networking technology.

Broadband access networks-whatever happened to fiber-to-the-home?

Abstract: By combining the latest technologies and architectures, including passive optical networks and loop lasers, fiber-to-the-home (FTTH) can come close to or even match the installed cost of other alternatives depending on the application. Additionally, FTTH offers operational economies during its installed life (e.g., related to powering, maintenance, provisioning, and upgrading), making it ultimately the most economical means to deliver broadband services. Clearly, FTTH should be considered for an important, near-term role in many broadband infrastructures.

Metropolitan optical network

Abstract: Optical WDM networks would be attractive in the metropolitan area, but differ in demands and requirements must be met to compared to applications within long distance networks. The ACTS-METON consortium is developing a rearrangeable optical network for use in the metropolitan area.

Prospects of photonic devices for telecommunications networks

Abstract: In discussing feasible performance and economical features of the forthcoming network, we have to base our discussion on photonic devices. In fact, expected new applications, functions, and improvements in photonic systems often rely on photonic devices. Development of photonic devices is crucial in developing important applications, such as high-throughput telecommunications networks with optical cross connect/add-drop multiplexing functions, transmission systems exceeding one Tbit/s with TDM and WDM configurations, low-cost subscriber systems with high accessibility, and flexible office- and home-use network systems. Such photonic devices must: achieve the required high performance at a low cost.

Optical nodes in the PHOTON field trial

Abstract: PHOTON is one of the ACTS projects which aims at the development of selected concepts for the future transport network and at the implementation of its key functionalities in a field trial for demonstration of the feasibility and validation of the networking ideas. Within the project PHOTON the design of the all-optical nodes for the optical transport network will be demonstrated and verified in the PHOTON field trial called PHOTONET. In PHOTONET, a border crossing star network between Munich and Vienna via Passau will be implemented demonstrating transmission and cross- connection of optical frequency division multiplexed signals over already installed single mode fiber, spanning a distance of 524 km. The optical cross connect (OCC) builds the inner node of the network, connecting several FDM links (multichannel ports) and a number of single channel ports. The latter ones are used for adding local add/drop functionality to the OCC. The principal functions of an OCC are to perform all-optical cross-connecting, optical signal supervision, optical signal regeneration and add/drop functionality. The optical terminal multiplexer (OTMX) builds the interface between the client network and the optical transport network. The basic functions of the OTMX are the provision of the interface to the existing transport networks and to the novel leased optical channel service. The OCC and OTMX architectures are modular, so that any new requests for improvement of their functionality (as frequency conversion or fiber protection switching) can be easily achieved.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Media access control of optical local area networks

Abstract: A local area network control protocol has been designed to implement optical packet switching, which takes advantage of out-of-band control and edge electronic buffering to avoid the issues of DWDM technology The star-topology network utilizes centralized control and offers collision-free data transmission where the resource scheduling takes place in advance There is an edge interface between the end user and the hub which is particularly designed to enable the scheduling and controlling together with the arbiter in the hub Electronic packets are converted into optical packets via wavelength striping technology before they get transmitted in the network Neither optical buffer nor header reading is required in the central switches The network structure and design of the components are described in details in this paper The network has been modelled via OPNET simulations to validate the designed protocol Performance has also been evaluated