Novel Redundancy Design Methodology for an Optimal PON Protection Architecture

Kim, Young‐Min; Ryu, Min-Cheol; Park, HongShik; Yoo, Jeong-Ju

doi:10.1109/ofc.2007.4348692

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…The PONs with bus topologies are not very typical; however, several potential applications for bus‐type PONs have already been proposed . Ring topologies for PONs were already presented, but only in case of WDM PON and hybrid WDM‐TDM PON , or these solutions were based on special ONUs with optical switches and other nonstandard elements .…”

Section: Forming Pon With Ring Topologymentioning

confidence: 99%

Experimental Verification of Passive Optical Network With Ring Topology

Lafata

Vodrazka

2013

Micro & Optical Tech Letters

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Today, tree or hybrid tree‐star topologies are mostly used for passive optical networks in practice. However, these topologies are significantly vulnerable against the failures of a central optical line termination (OLT) unit. Recently, an innovative idea about forming a simple ring topology by using asymmetric passive splitters together with secondary OLT unit has been presented and an elementary mathematical model for calculations of optimum splitting ratios of all splitters in a ring infrastructure has been described. The major advantage of presented ring topology is that both primary and secondary OLT units can be placed on the opposite sides of the ring, which could greatly increase the overall resistance of the whole network against critical failures, malfunctions, or sophisticated attacks. Next, this ring topology was successfully realized in practice by using real OLT and optical network units and the whole idea verified. The results of real measurements as well as theoretical calculations are presented in this article. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2201–2205, 2013

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Section: Forming Pon With Ring Topologymentioning

confidence: 99%

Experimental Verification of Passive Optical Network With Ring Topology

Lafata

Vodrazka

2013

Micro & Optical Tech Letters

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“…The main disadvantage of presented duplex methods is mainly the necessity of using spare optical fibres, splitters or optical line terminations (OLTs) and ONUs, while B, C and D scenarios are also based on using nonstandard 2 : N passive splitters (simple or doubled).The OLT protection methods presented within both recommendations [6] and [7] are based on a simple redundancy technique. However, typical PON distribution network has a star or a tree-star topology in practice, which does not offer many opportunities for reliable OLT backup and protection, as discussed in [4] and [9]. Because all optical fibres and branches of a star or a tree topology are usually concentrated into one single central point, the backup (secondary) OLT unit can be placed only in the same location as the primary one.…”

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confidence: 99%

Novel protection strategies for passive optical networks based on ring and bus topologies

Lafata

2014

Trans. Emerging Tel. Tech.

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This paper is focused on passive optical networks (PONs), especially on increasing their network resilience. Because the most critical components in PONs are usually the optical line termination unit (OLT) and optical fibres connecting all network nodes, the main motivation presented within this paper is to improve the resistance of PON against critical failures of OLT and optical fibres between them. Both presented solutions are based on using dual OLT units and the application of asymmetric splitters in order to balance the attenuation and optical signal levels throughout the entire network, while the main innovation consists in the application of ring and bus topologies. Both bus and ring topologies can be formed easily using only passive splitters with optimum splitting ratios; therefore, no active components are necessary. The next advantage is the opportunity of placing both OLT units in physically diverse location, thus increasing the overall network resilience. Moreover, the presented idea with a bus topology offers an additional resistance against the failures of optical fibres connecting the splitters as well. Because the application of asymmetric passive splitters in both solutions is necessary in order to optimize the optical signal levels in the entire network, the mathematical models for calculating of their optimum splitting ratios are included. To verify the functionality of both topologies and their protection mechanisms, complex simulations were performed and are presented in this article as well.

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Fault-tolerable and SLA-supportive architecture for TWDM-PON systems

Rawshan

Park

2015

Photon Netw Commun

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Novel Redundancy Design Methodology for an Optimal PON Protection Architecture

Cited by 5 publications

References 4 publications

Experimental Verification of Passive Optical Network With Ring Topology

Experimental Verification of Passive Optical Network With Ring Topology

Novel protection strategies for passive optical networks based on ring and bus topologies

Fault-tolerable and SLA-supportive architecture for TWDM-PON systems

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