Fen Zhou, Miklos Molnar, Bernard Cousin, and Gwendal Simon (2011)
Power-optimal Design of Multicast Light-trees in WDM Networks
IEEE Communications Letters 15(11):1240 - 1242.
Given a multicast session in Wavelength Division
Multiplexing (WDM) networks, we try to find the multicast
lighttrees with the minimum power budget while taking into
account the optical power loss as light splitting loss,
node tapping loss and light attenuation loss. Although
light splitting causes nonlinear power relationship, we
succeed to formulate this problem as a Mixed-Integer Linear
Programming (MILP) by developing a set of equivalent linear
equations to replace the non-linear ones. The distribution
of power loss is analyzed by simulations, which suggests to
bound the combined power loss ratio of the node tapping
loss and the light attenuation in each source-destination
path, and make power-symmetric light-trees by properly
using light-splitters in order to minimize the overall
power loss.