Abstract
The sustained growth of network traffic has aggravated transmission
capacity limitation problems. Recently, elastic optical networks (EONs)
based on space division multiplexing (SDM) technology have been proposed
to improve spectral efficiency and overcome upper limits on capacity by
expanding the spatial dimensions. Accordingly, SDM-EONs can provide higher
capacity, higher spectral efficiency, and more flexible optical
transmission to address future explosive data growth. However, the
critical challenge for the widespread deployment of such complex networks
is to ensure their survivability against various types of network failures
including core failure, node failure, link failure, and shared risk link
group (SRLG) failure. In this paper, we consider the robust design of an
$N$
-single-mode-fiber-bundle (
$N$
-SMFB)-based SDM-EON with shared backup path protection
(SBPP). Considering the network reliability against various failures and
the uncertainty in traffic volume, we focus on the routing, space, and
spectrum assignment (RSSA) problems for the determination of working path
and backup path. We formulate the problems as two mixed integer linear
programming (MILP) models with the objective of minimizing the maximal
frequency slot used (FS) index and the total number of backup FSs. In this
scenario, we propose heuristic algorithms for routing decision-making and
spectrum assignment. We compare spectral efficiency and execution time
among the MILP models, our proposed algorithms, and an existing algorithm.
Finally, we employ
$\Gamma$
-robust optimization to handle traffic with uncertainties
and compare the simulation results obtained in deterministic and
nondeterministic scenarios.
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