2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85170We study the class of endlessly single-mode all-silica photonic crystal fibers with a triangular air-hole cladding. We consider the sensibility to longitudinal nonuniformities and the consequences and limitations for realizing low-loss large-mode area photonic crystal fibers. We also discuss the dominating scattering mechanism and experimentally we confirm that both macro and micro-bending can be the limiting factor.Accepted for Journal of Optics A - Pure and Applied OpticsOpticstext