Exploring Channel Probing to Determine Coherent Optical Transponder Configurations in a Long-Haul Network. - Kaida Kaeval; Danish Rafique; Kamil Blawat; Klaus Grobe; Helmut Grießer; Jörg-Peter Elbers; Piotr Rydlichowski; Artur Binczewski; Marko Tikas (OFC, 2020)