The customer premises equipment (CPE) provides connectivity between the access network and the home network. In the current wireline network architectures, the CPE consumes more power per user than any other element in the network. Considering the large number of users, CPE is an important contributor to the overall carbon footprint and hence it should be designed with energy efficiency in mind.
Next generation access network will require flexible deployment, large capacity, easy upgradability to serve more users and longer reach (over 100km). Current standardization bodies such as ITU and IEEE are investigating various NGA architectures based on these requirements. However, because of longer reach and increased capacity, future access network would be more vulnerable to various failure conditions such as fiber cuts and equipment failures. Therefore, new NGA proposals must consider fault-tolerant architectures to minimize various failure impacts on access network.
Passive optical networks have been identified as promising access solutions that can open the first-mile bottleneck, bringing gigabits-per-second data rates to end users. Current TDM PONs enjoy low cost by sharing resources in time, but suffer from limited capacity. In the future, WDM technology may be employed to achieve high performance. This project introduces a novel PON architecture that employs dynamic wavelength allocation to provide bandwidth sharing across multiple physical PONs.
Analysis of energy consumption in IT network architectures of office buildings. Goal is to design an energy efficient office IT network.
Next generation access network will require flexible deployment, large backbone capacity, upgrade ability, scalable to user number and demand, and economically feasible. One example is to provide ubiquitous, blanketed broadband access service in metropolitan area. Such requirements are intrinsically impossible to meet if the network is designed with any single access technology. On the other hand, a hybrid optical and wireless access network would combine high optical capacity and flexible wireless deployment that is economic and scalable.
Optical access networks are considered to be a definite solution to the problem of upgrading current congested access networks to ones capable of delivering future broadband integrated services. However, the high deployment and maintenance cost of traditional point-to-point optical architectures is a major economic barrier to wide-spread deployment. Current TDM-PON architectures are economically feasible, but bandwidth-limited.
Metropolitan area networks (MANs) connect access points within a large geographical area (~100km circumference) to the internet backbone. HORNET is a novel MAN architecture that addresses two fundamental shortcomings in traditional metro networks: (1) efficient transport of the ever-increasing quantity of bursty, best-effort internet traffic, and (2) cost-effective scalability, especially when considering peer-to-peer traffic across a metropolitan area.
As the Internet expands and handles more applications, growing numbers of requirements are being imposed on Optical Metropolitan Area Networks (MAN). MAN provides links to a diverse customer base and thus needs to support a variety of services including IP, ATM, Frame Relay, Gigabit Ethernet and SONET. Moreover, since each customer will have a different capacity and QoS requirement, MAN also needs to support bandwidth provisioning.
The main bottleneck of today's networks is in their access segment. To address that bottleneck, this project is focused on fiber broadband access. MARIN was launched in 2005 to investigate a powerful set of technologies for fiber access and MANs. MARIN stands for Metro and Access Rings Integrated Network, and makes use of wavelength division multiplexing (WDM) ring technology to address the current and future limitations of both access networks and MANs. MARIN has the following innovative features:
In metro area network, p2p traffic keeps increasing. The characteristics of this traffic is bursty in time and randomly generated in space, which is not appropriate to current telephone oriented network. Therefore, future MAN architecture is required to accommodate p2p traffic as well as other multicast traffic. Furthermore, for the real deployment, we should consider cost and flexibility in developing new network architecture.
To support more users and high-bandwidth applications, FTTx technology in the near future will move toward higher speed and more wavelengths beyond currently deployed EPON and GPON. As service providers require smooth evolution and bit-rate enhancement of TDM PONs, coexistence of multi-rate multi-wavelength G/EPONs is the most promising approach for practical deployment.
Burst mode transmission at high bit-rates is challenging due to the lack of suitable optical burst mode transceivers. High performance burst mode optical transceiver is still a subject of intensive research. This project will investigate the feasibility of and the technologies for high speed optical burst mode transceivers, and design high performance integrated circuits for burst mode laser driver and clock and data recovery.
Fiber optical parametric amplifiers (OPAs) are based on the third-order susceptibility of the glasses making up the fiber core. OPAs boast advantages, like increasing bandwidth with increasing pump power, arbitrary center wavelength, large gain, idler generation, and high-speed optical signal processing, which make it a promising technology for application and band conversion in future wavelength-division multiplexing(WDM) systems and next-generation optical networks.
Recent developments in optical and wireless networks bring the prospects of higher bandwidth, ubiquitous access and a wide range of new applications to millions of users. The design of next generation networks should also address principles of flexibility, scalability, cost-effectiveness, and environment-friendliness.
Future local area network’s (LAN) are expected to provide the wide variety of services, both low and high speed ones.. The low speed services could be handled by evolutionary versions of the presently available networks. The high speed ones require a new generation of local area networks. The target is therefore an integrated services boras-band optical local area network (BOLAN) that supports the whole spectrum of traffic. Previous efforts, such as WDM star solution for operating a BOLAN, although attractive from the bandwidth point of view, causes difficult implementation problem.
Optical access networks, including Fiber To The Home /Curb / Node (FTTX), has long been considered a definite solution to the problem of upgrading current congested access networks to ones capable of delivering future broadband integrated services. Time Division Multiplexing Passive Optical Networks (TDM-PONs) have been developed to address this issue.
With the increasing demand for higher connection speeds by home users, higher bandwidth optical networks are making their way closer to the end users. Access networks based on optical components, especially Passive Optical Networks (PONs) provide an efficient mechanism for setting up of these networks. On the other hand, these networks are prone to certain security risks. The study of these risks and solutions for mitigating them is necessary for PONs to become successful.
This program proposes to investigate and experimentally demonstrate UltraFlow - a hybrid future Internet architecture that is secure, dynamic (both agile and adaptive), and significantly more cost effective for future growth in data volumes and number of users. UltraFlow relies on a novel optical network infrastructure comprising new transport mechanisms and a new comprehensive control plane including network protocols from the physical layer up to the application layer.
Leonid G. KazovskyProfessor of Electrical Engineering |
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