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Opt."],"published-print":{"date-parts":[[2026,8,10]]},"abstract":"<jats:p>We report on a polarization-maintaining (PM) very large mode area (VLMA) Er-doped fiber with a 40\u00a0\u00b5m hexagonal core, fabricated via the REPUSIL powder process. The fiber\u2019s performance was evaluated in a MOPA configuration under 976\u00a0nm cladding-pumping and 1480\u00a0nm core-pumping. A numerical model, distinguishing between isolated ions and clusters to account for cooperative up-conversion and pair-induced quenching, shows excellent agreement with experimental results. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}