Abstract
Passive Optical Networks (PONs) are mostly used as modern high-speed access networks today. Typically, PONs are based mainly on tree or hybrid tree-star topologies in practice. However, these topologies are significantly vulnerable, especially in case of sophisticated attacks or global malfunctions of central optical line termination (OLT) units. Due to that, an innovative idea of forming PON with a simple ring topology by using standard passive splitters was proposed and is presented within this paper. Thanks to a ring topology, the secondary OLT unit can be placed in any potential location within the ring and this can significantly increase the vulnerability of the whole network. The article contains the description of this idea and also necessary simulations were performed. To verify these theoretical assumptions, experimental PON network with a ring topology was created and its characteristics were measured and compared with simulations and models. Moreover, the functionality of the protection mechanism was confirmed as well as the functionality of the entire ring PON network.DOI: http://dx.doi.org/10.5755/j01.eee.19.5.1683
Highlights
Modern passive optical networks (PONs) represent a promising solution for future high-speed access networks providing shared transmission rates of 1, 2.5 or 10 Gbps for up to 256 connected users [1]
The experimental network was based on the following optical components and equipment: 1) Huawei MA5603T multi-access platform containing H802GPBD optical line termination (OLT) card with 2 OLT GPON modules using C class attenuation specification [10]; 2) 6 pieces of Huawei EchoLife HG8010 GPON terminals used as Optical network units (ONUs) units; 3) EXFO FTB-500 platform containing FTB-5240S/BP module with optical spectrum analyser; 4) a set of asymmetric passive optical splitters with splitting ratios: 5%-95%, 10%-90%, 20%-80% and symmetric splitters 50%-50%; 5) two optical fibres with lengths of 5 km and characteristics according to the ITU-T G.652
This paper presented an innovative idea for protection of passive optical networks against the critical failures of central OLT units
Summary
Modern passive optical networks (PONs) represent a promising solution for future high-speed access networks providing shared transmission rates of 1, 2.5 or 10 Gbps for up to 256 connected users [1]. PONs are typically deployed for first-mile access networks to provide fast and reliable network connection mainly for households, offices and industry applications [1] These applications are generally not very critical regarding the protection against network malfunctions. A ring topology could be formed by using standard passive optical splitters with symmetric or asymmetric splitting ratios, which would enable placing the backup (secondary) OLT unit at any position in a ring making the whole infrastructure less vulnerable. The initial idea of PON protection using ring topology was partially presented in [8] as well as the mathematical model for calculating optimum splitting ratios of used asymmetric splitters. The comparisons between simulated and measured results are presented in this article as well as the verification of the functionality of proposed idea
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