Next-generation ring based self healing WDM-PON architecture with private networking capability and wavelength sharing
Başlık çevirisi mevcut değil.
- Tez No: 401047
- Danışmanlar: PROF. DR. MOHAMMED A. ALI
- Tez Türü: Doktora
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2008
- Dil: İngilizce
- Üniversite: The City University of New York
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 184
Özet
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Özet (Çeviri)
There is little argument that today's subscriber access network faces many challenges, and remains a bottleneck in terms of the bandwidth and quality of service it affords to the end-users. The change in the fundamental character of access networks traffic, as demonstrated by the current shift from voice and text-based services to a bundle of bandwidth hungry converged services that include IPTV, VOIP, gaming, video streaming, and peer-to-peer applications, is further highlighting the gravity of this problem. This has thus seriously impeded the growth of truly broadband services and applications. Once the bandwidth and quality barrier of today's access networks is removed, new and unforeseen applications will emerge and attain widespread popularity. While existing broadband access solutions have increased capacity from the range of 56 kb/s for a dial-up modem to a few Mb/s for a cable modem or digital subscriber line (DSL) connection, this is still far short of the gigabit line speed necessary to support the evolving rich multimedia and real-time services. There is a growing perception that copper access networks will soon no longer be able to meet the ever-growing consumer demand for bandwidth. This, along with a combination of regulatory and competitive forces, as well as recent rapid advances and standardizations of Passive Optical Network (PON) technology, are finally prompting carriers around the world to consider PONbased Fiber-To-The-Home (FTTH) systems as possible successor to current copper-based access solutions. FTTH is the ultimate level of access, allowing end users to access the backbone networks through the gigabit capacity of a fiber optic cable. Among the various PON-based FTTH solutions, single channel Time-Division Multiplexed PON (TDM-PON) and multi-channel Wavelength-Division Multiplexed PON (WDM-PON) architectures are the two most viable candidates. WDM-PONs are emerging as the most promising next-generation access solution that can provide evolutionary upgrade to existing TDM-PONs. WDM-PON has been positioned as a possible successor to TDM-PON-based FTTH implementations. Though technically feasible, compared to TDM-PON, it is still considered too expensive for widespread residential deployment. However, as we argue in this work, this is only true for lowbandwidth applications, where utilizing TDM-PON might be a little less expensive, but as bandwidth demand increases, the economics change.“In terms of cost per bit rate,”WDM-PON is more efficient and economical." vi Though numerous WDM-PON architectures have tackled the limitations of traditional WDM-PONs, however, each of these proposed architectures has only addressed just a single limitation. All of these architectures apply point-solutions and work-arounds to the existing traditional WDM-PON. The fact remains that these point-solutions, which incrementally applied to the traditional WDM-PONs result in increased cost and complexity. The end result is that although these architectures are technically feasible, they are still considered too complex and expensive for widespread near-term deployment of WDM-PONs. Event if these WDM-PON architectures were to take hold in the future, it is likely to be a rather distant future. For WDM-PON-based FTTH solutions to evolve as the envisioned next generation broadband access networks, at a minimum, they must support all of the features offered by existing TDM-PONs, including simplicity, flexibility, cost-effectiveness, dynamic bandwidth allocation, and private networking capability. The transition to FTTH raises a whole range of technical hurdles and complex questions. It is the purpose of this thesis to explore and address some of these challenges and questions, and in the process to capitalize on the key findings to devise a novel, simple and cost effective local access C/WDM-PON-based FTTH architecture that addresses the many challenges on the horizon. The proposed architecture builds upon a new direction to the design and implementation of next generation broadband access networks, and so is likely disruptive. The salient features of the proposed architecture is that not only does it addresses the key limitations of today's existing access infrastructure; but also supports most of the crucial features that must be supported by the envisioned next-generation broadband access networks, including simplicity, flexibility, cost-effectiveness, dynamic bandwidth allocation and sharing, guaranteed QoS, private networking capability, and above all survivability. Some of the challenging questions as well as the key debates in the FTTH market that this work will address are: (1) Can the high cost of FTTH deployment really be justified? (2) Which architectures and technologies best meet requirements? (3) Whether future FTTH will be dominated by TDM-PONs or WDM-PONs? And whether it will be built on open-access principles – available on a wholesale basis to all service providers – or as a closed network, with access restricted to or controlled by the builder. This work examines the technological requirements and assesses the performance analysis and feasibility for implementing a novel WDM-PON-based FTTH broadband access architecture that addresses the key limitations of conventional tree-based PON architectures including: a) providing a simple and cost-effective fully distributed/hybrid resilience capabilities against most types of networking failures; b) supporting private networking capability as well as dynamic allocation and sharing of network resources. Specifically, this work proposes and devises a novel self healing ring-based local access C/WDM-PON architecture that efficiently supports dynamic allocation of wavelengths/ timeslots and sharing traffic as well as truly direct private connections among PON end users. The proposed architecture combines the salient features of both traditional static WDM-PON (i.e., dedicated connectivity to all subscribers with bit rate and protocol transparencies, guaranteed QoS, and increased security) and dynamic WDM-PON (i.e., efficiently utilizing network resources via dynamic wavelength allocation/sharing among end users).
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