606 research outputs found
Optimizing the migration to future-generation passive optical networks (PON)
We study the upgrading problem of existing Passive
Optical Networks (PONs) that need to increase their capacity at
different points in time. Our method upgrades line rates and migrates
network services over new wavelength channels based on
increasing traffic demand and cost constraints. Our method minimizes
capital expenses and system disruptions, while ensuring effective
resource usage. Our multistep model uses Mixed Integer
Linear Program (MILP) formulations whose cost parameters are
set by a pricing policy. We evaluate the PON upgrade through installation
of single-wavelength transceivers or multiple-wavelength
arrays of transceivers. We consider a typical case study, which is
solved using CPLEX. Illustrative examples demonstrate the attractive
properties of our method.Postprint (published version
Novel hybrid WDM/TDM PON architectures to manage flexibility in optical access networks
Different hybrid WDM/TDM PON architectures are compared in terms of flexibility, simplicity (affecting the cost), insertion loss (affecting the reach) and security. Special attention is given to the flexibility aspect in next generation optical access networks by designing different architectures with a different degree of flexibility, which are able to cope with different ranges of dynamic bandwidth allocation (DBA) possibilities. This paper assesses the degree of architectural flexibility needed to deal with some important flexibility advantages. It is shown that mostly a partially flexible architecture fulfils the needs. The architectures are then further evaluated from a cost and reach perspective. In this way, we provide a complete comparison considering all the key aspects of access network design. It is shown that a hybrid WDM/TDM PON with a partially flexible architecture in the first remote node can be an interesting candidate for next-generation optical access networks
SARDANA: an all-optical access-metro WDM/TDM-PON
A new optical access network, named “Scalable Advanced Ring-based passive Dense Access Network
Architecture” (SARDANA), is presented. It transparently integrates WDM metro and TDM PON access
technologies, implementing ring protection, 100 km reach and up to 1024 users served at 10 Gb/s, with
passive highly-shared infrastructure. The introduced innovations are hybrid ring/tree WDM/TDM Passive
Optical Network (PON) architecture; a resilient remote node (RN), which is distantly pumped from the
Optical Line Terminal (OLT); and a reflective ONU (Optical Network Unit); as well as an enhanced
Medium Access Control (MAC) protocol.Postprint (published version
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