Abstract
We reveal that the core-to-cladding ratio (Rcc) dependence on the power conversion efficiency (PCE) in cladding-pumped multi-core fibre (MCF) amplifiers differs depending on the operating bandwidth. We obtain the highest PCE from the reported cladding-pumped L-band coupled-MCF amplifiers, 5%, with a fabricated Rcc-optimized 12-core amplifier.
© 2022 The Author(s)
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