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. 2016 May 16;6:26024. doi: 10.1038/srep26024

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EDF, erbium-doped fibre; WDM, wavelength-division multiplexer; PC, polarization controller; SMF, single-mode fibre; PI-ISO, polarization-independent isolator; LD, laser diode; GCM SA, graphene-clad microfibre saturable absorber.