engleski

Efficient optical amplification in self-healing synthetic ROADMs

Optical backbone networks are carrying enormous amount of traffic and therefore, network reliability performance is extremely important to minimize the service interruption time and loss of data. Besides, increasing energy consumption of the ICT sector makes network energy efficiency gain a lot of atten-tion. Reducing the usage of components in the network is a prom-ising strategy to both make network more energy efficient and reliable as it allows (i) putting idle components into a power-saving, or sleep, mode and (ii) reusing them as redundancy for failure recovery. The new generation of synthetic reconfigurable optical add-drop multiplexers (ROADMs) implemented by Ar-chitecture on Demand (AoD) supports the above functionalities by offering unprecedented flexibility and self-healing capabilities. In AoD nodes, components are interconnected via high- port-count optical switch serving as optical backplane, and each con-nection uses only the components necessary to fulfill the switch-ing and processing requirements. In this paper, we aim at improving optical network availability and reducing power consumption by minimizing the number of optical amplifiers used in AoD nodes. To this end, a decision on the necessity of signal amplification is made for every connection according to the power level at each node. Unnecessary amplifi-ers are bypassed and put into sleep mode, decreasing the overall power consumption of the network. This also reduces the associ-ated risk of connection failure, while reuse of idle amplifiers for failure recovery further improves connection availability. To gain greater insight into the benefits of our approach, we analyze the performance of the NSF and EON network deploying AoD nodes with different optical backplane implementations, i.e. 3D MEMS and piezoelectric optical switch (POS), and compare them with networks deploying hard-wired ROADMs. Simulation results show that deployment of synthetic AoD nodes with POS as opti-cal backplane can reduce the network mean down time and pow-er consumption of EDFAs by up to 63% and 38%, respectively, on average over all test cases.

Architecture on Demand; availability; EDFA; elastic optical network; mean down time; MEMS; optical amplifi-cation; piezoelectric optical switch; synthetic optical node

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