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In-situ sensing capability of a novel PCF with a large central hole of ∼60 m and a suspended ring core was investigated experimentally. The fiber provides a larger overlap between the measurand and the guided light with an enhanced sensitivity.
We experimentally demonstrate an inline few-mode erbium doped fiber amplifier supporting six spatial modes with reconfigurable differential gain control and excellent gain flatness obtained through mode-selective bidirectional pumping of a custom fiber with a radially profiled erbium dopant distribution. A signal gain of ${>}{\rm 20}~{\rm dB}$ was obtained for all the guided modes with a differential...
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