Showing papers on "10G-PON published in 2011"

Opportunities for next-generation optical access

Abstract: Next-generation optical access technologies and architectures are evaluated based on operators' requirements. The study presented in this article compares different FTTH access network architectures. Additionally, the impact of new business models on network architectures is discussed.

OpenFlow-based wavelength path control in transparent optical networks: A proof-of-concept demonstration

Abstract: We experimentally present a proof-of-concept demonstration of OpenFlow-based wavelength path control for lightpath provisioning in transparent optical networks, assessing its overall feasibility and quantitatively evaluating the network performances.

Evaluation of ONU power saving modes for gigabit-capable passive optical networks

Abstract: Energy efficiency has become an increasingly important aspect of designing access networks, due to both increased concerns for global warming and increased network costs related to energy consumption. Comparing access, metro, and core, the access constitutes a substantial part of the per subscriber network energy consumption and is regarded as the bottleneck for increased network energy efficiency. One of the main opportunities for reducing network energy consumption lies in efficiency improvements of the customer premises equipment. Access networks in general are designed for low utilization while supporting high peak access rates. The combination of large contribution to overall network power consumption and low utilization implies large potential for CPE power saving modes where functionality is powered off during periods of idleness.

Development of optical packet and circuit integrated ring network testbed

Abstract: We developed novel integrated optical packet and circuit switch-node equipment. Compared with our previous equipment, a polarization-independent 4 × 4 semiconductor optical amplifier switch subsystem, gain-controlled optical amplifiers, and one 100 Gbps optical packet transponder and seven 10 Gbps optical path transponders with 10 Gigabit Ethernet (10GbE) client-interfaces were newly installed in the present system. The switch and amplifiers can provide more stable operation without equipment adjustments for the frequent polarization-rotations and dynamic packet-rate changes of optical packets. We constructed an optical packet and circuit integrated ring network testbed consisting of two switch nodes for accelerating network development, and we demonstrated 66 km fiber transmission and switching operation of multiplexed 14-wavelength 10 Gbps optical paths and 100 Gbps optical packets encapsulating 10GbE frames. Error-free (frame error rate < 1×10(-4)) operation was achieved with optical packets of various packet lengths and packet rates, and stable operation of the network testbed was confirmed. In addition, 4K uncompressed video streaming over OPS links was successfully demonstrated.

An impairment-aware virtual optical network composition mechanism for future Internet

Abstract: A new impairment-aware infrastructure as a service architecture enabled by optical network virtualization is proposed. A novel impairment-aware virtual optical network composition mechanism for this architecture is proposed and its performance is evaluated.

Challenges in next-generation optical access networks: addressing reach extension and security weaknesses

Abstract: Recently, broadband optical access networks were being deployed worldwide to deliver large bandwidth to end users. Currently, the operators have been mainly deploying time-division multiplexing (TDM) passive optical networks (PON) in their networks. As bandwidth demand continues to increase, the industry further selected several next generation optical access (NGA) options to upgrade from current TDM-PON architectures. Besides increasing bandwidth requirement, current TDM-PONs suffers from limited reach and split-ratio. To further reduce the capital and operational expenditure requirements of current TDM-PON, NGA architectures must consolidate the number of central office sites. Long-reach optical access (LROA) architectures are promising solutions that employ optical amplifiers to increase optical budget to support longer reach and higher split-ratio in the distribution network. As more end users are supported over shared physical medium in LROA, access network security is of greater importance. The first part of this article reviews important LROA architectures and their enabling technologies. Moreover, few works in current literature address security weaknesses in LROA. The second part of this article reviews these security weaknesses as well as monitoring and control techniques employed in current TDM-PONs. In addition, a novel class of quasi-passive and reconfigurable devices is presented that addresses aforementioned security weaknesses and is suitable for LROA.

Power consumption evaluation of hybrid WDM PON networks for data centers

Abstract: As the requirements for processing power of the datacenters continues to increase rapidly, higher performance networks are required to sustain the increased communication bandwidth demand within the data center. Current data center networks cannot affordably satisfy the required bandwidth of emerging application without consuming excessive power. Optical interconnects provide a viable solution offering high throughput, reduced latency and reduced energy consumption compared to current networks based on commodity switches. This paper presents a novel hybrid approach that use commodity Ethernet switches for intra-rack communication and WDM PON for inter-rack communication. The proposed scheme is based on readily available, passive optical components devices, thus eliminating the power dissipated in Top-of-the-Rack switches for the inter-rack communication. The performance evaluation based on simulation shows up to 10% power reduction with negligible increase on the packet latency.

Technical options for NGPON2 beyond 10G PON

Abstract: This paper presents a view of the trends and perspectives in the next generation of optical access solutions following the 10Gbit/s Passive Optical Networks.

Value analysis methodology for flexible optical networks

Abstract: A methodology for the estimation of the value of flexible networking in comparison with standard WDM solutions is presented, and specifications for the cost of the required flexible transponders and WSSs are extracted.

Performance evaluation for optical backhaul and wireless front-end in hybrid optical-wireless access network

Abstract: The hybrid optical-wireless access network (HOWAN) is a promising broadband access network. In this paper, the new architecture of the HOWAN is proposed and designed based on both a wavelengths division multiplexing/time division multiplexing passive optical network (WDM/TDM PON) at the optical backhaul and a wireless fidelity (WiFi) technology at the wireless front-end. The power budget of the optical backhaul based on maximum split ratio of 1/32 for each wavelength channel and a fiber length of 23 km from the central office (CO) to a 54 Mb/s access points (APs) along a 50 m outdoor wireless link is analyzed.

Next Generation Optical Access Networks

Abstract: Future optical access networks must support increased rate, reach, split, multi-operator access & wireline / wireless convergence. This paper outlines the role, challenges and breakthroughs of NG technologies including TDM-PON, WDM-PON & TWDM-PON.

High Transmission Bit Rate of Multi Giga Bit per second for Short Range Optical Wireless Access Communication Networks

Abstract: In the present paper, the backbone and the broadband wireless access communication network technologies can increasingly provide unprecedented bandwidth capacities, the focus being gradually shifted toward broadband access technologies capable of connecting the customer premises to the local exchange. Optical wireless is increasingly becoming an attractive option for multi giga bit per second within short range (up to 5 km) links where laying optical fiber is too expensive or impractical. For such links, a tracking scheme is essential to maintain proper pointing of the transceivers at each other to establish error-free communication. The optical wireless technology is used mostly in wide bandwidth data transmission applications. Also, we have investigated the maximum transmission distance and data transmission bit rates that can be achieved within broadband wireless optical links for multi giga bit optical network applications. The wireless optical broadband access network architecture has been proposed as a flexible solution to meet the ever-demanding needs in access networks. At the wireless front end multi channel communication, with routers having multiple radio interfaces tuned to non overlapping channels, it can be used to improve network throughput in a cost effective way. Key words: Optical wireless communications, short range, indoor links, data link, and outdoor links

Location and Allocation of Switching Equipment (Splitters/AWGs) in a WDM PON Network

Abstract: With the growing popularity of bandwidth demanding services such as HDTV, VoD, and video conferencing applications, there is an increasing demand on broadband access. To meet this demand, the access networks are evolving from the traditional DSL and cable techniques to a new generation of fiber-based access techniques. While EPONs and GPONs have been the most studied passive optical access networks (PONs), WDM-PON is more often seen as the next generation trend with an hybrid set of switching equipment. We propose a new optimization scheme for the deployment of greenfield WDM PON networks to minimize their total deployment costs. Based on the geographic location of ONUs and their corresponding traffic demand, our proposed scheme optimizes the placement of splitters and AWGs in a WDM PON. The solution process has two phases. In the first phase, ONUs are grouped around switching equipment into different clusters and then each cluster is assigned a passive equipment(i.e.,splitter/AWG). In the second phase, we develop a column generation (CG) algorithm based on a mathematical model, for selecting the best multi-stage placement equipment topology. The resulting combination of the clustering and of the column generation algorithms encompasses the particular cases where all switching equipment are splitters/AWGs/mixture and outputs the location of the switching equipment of the PON network. Numerical results allow the validation of the models and of the algorithms on various data sets.

The road to scalable 1Gb/s FTTH access networks

Abstract: We outline the challenges and technologies to scale fiber access network speed to 1Gb/s and beyond.

Dynamic spectrum managed passive optical networks

Abstract: This article introduces the idea of employing dynamic spectrum management to passive optical network systems. The primary motivations of this system are to enhance the bandwidth, split ratio, and loss budget of existing PONs, without mandating the replacement of the ONU and passive optics. The technical issues to be overcome in DSM-PON are considered, including management of the ONUs' spectral distribution and various filter designs. Several system applications of the scheme are suggested that have good practical and economic benefits.

Analysis of Coexisting GPON and NG-PON1 (10G-PON) Systems

Abstract: In this paper, the simulation model of coexisting GPON and NG-PON1 (10G-PON) systems is presented, which has been developed for the analysis of feasibility and implementation issues of this coexistence. The aim was to analyze the impact of the most important parameters of the components that are needed for new network elements, on the performance of these coexistent networks. On the basis of the results obtained, the optimal parameters of the new system components were defined.

Breakthroughs in Optical Wireless Broadband Access Networks

Abstract: Enabling technologies for optical wireless broadband access networks have been explored and developed with respect to optical components, modules, transmission systems, and networks. In this paper, we review the most significant accomplishments reported during 2010 with emphasis on radio-over-fiber (RoF) technology that is critical for the deployment of optical wireless broadband access networks in the near future.

Energy efficient optical-wireless residential access/in-house networks

Abstract: Both ecological and economical forces drive the recent energy efficiency efforts for communication networks. The growth of the number of users and the ever-increasing bit rates raise concerns about the society's ability to reduce its energy consumption significantly in the near future. Access networks play a key role in this arena due to the sheer number of users and terminals and low sharing of the infrastructure as compared with other network segments. However, there is no universal framework so far for breaking down and analyzing the energy consumption map within access network. This paper introduces a comprehensive approach to the problem of energy consumption in the fiber-to-the-home (FTTH) access networks integrated with the in-house fiber/copper/wireless networks. The Customer Premises Equipment for Low-Power and Low-Cost Architectures (CUPELLA) project in our research group at Stanford investigates energy efficient access technologies using a structured methodology based on fundamental equipment building blocks both at the micro level and on the macro level when they are integrated into larger systems. Our study looks into both static and dynamic scenarios to exploit temporal and spatial features of the whole access network usage with the goal of substantially reducing the access energy consumption. Our preliminary results indicate that substantial energy saving is in fact possible. For example, with selective sleep mode and switching-mode customer premises equipment (CPE), more than 30% of energy could be saved as compared to broadcast-and-select architecture that does not apply sleep modes.

Semi-filterless optical network: a cost-efficient passive wide area network solution with effective resource utilization

Abstract: By utilizing advanced optical coherent transmission and electrical compensation technologies, two novel passive wide area network (WAN) solutions, filterless and semi-filterless optical networks, are able to eliminate the usage of the expensive active photonic reconfigurable components by interconnecting the nodes with passive optical power splitters/combiners and using tunable transceivers. Therefore, they have a potential to be more cost-effective and energy-efficient as well as more reliable than the networks based on active optical switching. In comparison with the filterless approach, the semi-filterless optical network can improve resource utilization by introducing passive wavelength filters at some selected nodes. This paper proposes a semi-filterless optical network design tool for filter placement and wavelength assignment and validates it on a number of network topologies. Performance evaluation confirm that the proper design of semi-filterless optical networks can offer significant reduction of the number of wavelengths needed to support a certain traffic demand compared to filterless networks while keeping all the advantages of the passive WAN solution.

Free space optical wireless network

Abstract: This talk explore an over the air optical wireless network and to create a network architecture for reliable high data rate free space optical networks that can interoperate with traditional wired and fiber networks. These networks will have significant impact for applications between ships, airborne vehicles, satellites and land-based cloud computing and data centres as an integrated high speed information system. Throughputs of well over Tbps can be supported by the network, which is compatible with next generations of Ethernet at 100 Gbps. The big challenge is to engineer the free space optical wireless network in the presence of atmospheric turbulence and weather, so it will behave properly when interfaced to other wire-line networks and for the protocols of the various network layers to interoperate end-to-end in a heterogeneous network setting.

Evolvable, sustainable, low power optical network architectures

Abstract: (100 Word Limit): Optical communications technology offers an opportunity for radical restructuring future telecommunications networks. The major challenges for future networks with fibre to the premises (FTTP) is; economic viability, resource sustainability, the ability to evolve and adapt to new technologies with out large scale uplifts, particularly of the physical layer infrastructure, and also be able to accommodate a wide range of operating and business models. This tutorial will examine these issues and possible network architectural solutions that offer potential economic viability, substantial reductions in resource usage, particularly power consumption, and the ability to evolve as new technologies emerge in the future. Presenter Bio (100 Word Limit): David joined BT labs in 1978 working on single-mode splicing, connectors, fibre couplers and FTTP. In 1982 he started work on shared access networks leading to co-inventing TPON the first PON. This work extended to amplified PONs and an experimental 50 million split, 500km, 16x2.5Gb/s wavelength PON in 1991. In 1995 he moved into business/traffic modelling examining drivers/economics for FTTP. From 1999 David led BT’s optical research and was awarded the Martlesham Medal for his contribution to optical access networks in 2005. He left BT in 2007 and is now Professor of Optical Network Architectures in CTVR, Trinity College Dublin.

Self-Healing Optical Access Networks (SHOAN) Operated by Optical Switching Technologies

Abstract: An optical access network should offer low-cost reliable services to its end users. To address this problem, an optimal solution is needed which can turn an optical access architecture into a self-healing system. Hence, we propose the Self-Healing Optical Access Network (SHOAN), in which two or more optical access architectures are partners of each other, and they are interconnected by elementary optical crossbar switches into a simple mesh network. In SHOAN, the crossbar switches can keep each access architecture as an independent and closed system for only serving its own end users in normal state. But the crossbars become open in fault scenarios. Whenever a failure occurs in the network, the fault can be monitored and affected services can be recovered by the partner of the access architecture that is affected. Such an interconnected optical access network can withstand failures in its transmission paths, and recover network services in a self-healing way. Compared to existing solutions (e.g., dual-home architecture), illustrative examples demonstrate that SHOAN has many desirable properties: (1) it is robust because risks are disjointed, (2) it is reliable because service recovery is given top priority, and (3) it has low cost because redundant backup components are not necessary since the partner's resources act as backup resources. Analysis results show that SHOAN can minimize disruption duration and network cost for broadband access services.

Current and next-generation passive optical networks monitoring solution

Abstract: In order to enable new services that require high data rates over longer distances, the optical fiber substitutes the copper cable step by step in the access network area. Time division multiplexed Passive optical network (TDM-PON) is a fast emerging architecture that uses passive components only between the customer and the central office. PON operators need a monitoring system for the physical layer to guarantee high service quality. This monitoring system is necessary during the fiber installation, final testing, regular operation of the network, and for fault localization. In this paper, we present our monitoring system based on optical coding for PON maintenance. This system has almost all the monitoring features required by a network operator. We explained the design and the principle operation of the technique. Moreover, we presents a management and protection solution for long-reach PON networks. Our system design achieves high reliability performance with almost half the cost if full network protection is used.

Experimental demonstration of a DREAM-based optical transport network with 1000 control plane nodes

Abstract: We propose a scalable framework for triple M routing in dynamic optical networks and first experimentally demonstrates a DREAM-based optical transport network with 1000 control plane nodes and multi-terabit per second ODUk electrical cross-connects.