Optimized Hybrid Raman/EDFA Ampliﬁer Placement for DWDM Mesh Networks
Pedro, J. M.
; Costa, N.
Journal of Lightwave Technology Vol. 36, Nº 9, pp. 1552 - 1561, May, 2018.
ISSN (print): 0733-8724
Journal Impact Factor: 2,567 (in 2015)
Digital Object Identifier: 10.1109/JLT.2017.2783678
The minimization of the number of expensive 3R regenerators required at intermediate nodes is a key task when planning long-haul optical transport networks. Combining Raman ampliﬁcation with Erbium-doped ﬁber ampliﬁers (EDFAs) is one of the strategies that can be exploited to achieve this objective, especially in the presence of long ﬁber spans. Given that hybrid Raman/EDFA ampliﬁers are more expensive than EDFAs, their deployment should also be minimized. However, determining the number and location of these ampliﬁers in a mesh optical network is a complex problem because of the overlap of lightpaths with different source and destination nodes at each link. A method to optimize the placement of hybrid Raman/EDFA ampliﬁers in mesh
optical networks is described in this paper. The proposed method analyzes the network as a whole and determines where to introduce Raman ampliﬁcation such that the 3R regenerator count is
minimized while also keeping the number of hybrid Raman/EDFA ampliﬁers at a minimum. It is shown that, in a reference mesh optical network, the proposed method clearly outperforms the simpler
placement approach based solely on ﬁber span attenuation.