A survey on regenerator Placement Problem in translucent optical network

A novel adaptive restoration algorithm for cost minimization of translucent optical networks

“…The translucent optical networks bridges the gap between opaque and trans- optical network is very close to the one provided by the fully opaque network in terms of the overall blocking but at the same time it drastically reduces the costs, that can be compared to the costs of transparent optical networks. [2] Due to these reasons translucent optical networks are the solution more deployed by network operator at the moment.…”

“…As we are in a translucent network environment, both approaches need to choose a set of nodes to equip with 3Rs. They dier each other on how they choose these strategic nodes [2].…”

“…In sparse 3R placement approach any node can potentially host regenerators. The sparse placement strategy usually allocates less 3Rs than what TI-based translucent networks do [2]. In the following we describe some of the several regenerators placement strategies proposed in technical literature.…”

“…Architecture scheme of an optical transport network2.1.1 WDM systemsOptical technology exploiting the wide spectrum of optical bers is the fundamental key that allows the metro and backbone networks to carry large amount of information. WDM technology is the best approach to take advantage of the large available bandwidth in an optical ber, as it divides the bandwidth of a single ber into dierent wavelength channels that do not interfere with each other and can carry information simultaneously[2].…”

Exact approaches for the directed network design problem with relays

“…A signal from a source node to its destination is sent using the wavelength routing through a lightpath which is an end-to-end connection over a dedicated communication channel (circuit) that traverses one or more links and uses one WDM channel per link. The circuit guarantees the full bandwidth of the channel and allows for a data rate of 10 or even 40 giga-bits per second (Gbps), see, e.g., [24] for further details. When deploying regenerators in such a network, the signal is converted from optical to electric and back to optical, each time a regenerator is used in the routing path from a source to its destination (such paths are commonly referred to as translucent lightpaths) .…”