Rearranging Optical Amplifiers for Upgraded Ultra-Low Loss (ULL) Fiber Links in an Elastic Optical Network

After the upgradation of new ultra-low loss (ULL) fibers for network links, some optical amplifiers on these links can become redundant. We consider rearranging these amplifiers for a lower system cost while not significantly degrading optical signal transmission performance. Different rearrangement strategies are proposed and evaluated.