| a) experimental setup illustrating the network layout and how the FPGA-based coherent transceiver prototype was connected to the network for continuous monitoring and sensing. (b) Map of Sunet’s Swedish fiber network with the 524-km route round-trip from Gothenburg to Karlstad highlighted in blue. (c) Zoom-in of the route consisting of aerial fiber, including five ROADM nodes, connected with aerial cables using shorter segments of buried fiber. The fiber break happened as one of these segments was accidentally exposed by an excavator, with the approximate location illustrated by the star. Credit: Chalmers U. and Nokia Bell Labs. |
