Coexistence in future optical access networks from an operator's perspective [Invited]. - Fabienne Saliou; Gaël Simon; Stéphane Le Huérou; Philippe Chanclou; Jérémy Potet; Georges Gaillard; Ugo Percevault; Dylan Chevalier; Joseph Zandueta; Bo Yang; Christos Vagionas; Marios Gatzianas; et al. (J. Opt. Commun. Netw., 2024)