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Opt Express. 2009 Sep 14;17(19):16394-405. doi: 10.1364/OE.17.016394.

Large-mode-area ytterbium-doped fiber amplifier with distributed narrow spectral filtering and reduced bend sensitivity.

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  • 1NKT Photonics, Blokken 84, 3450 Birkerød, Denmark.


A large-mode area polarization maintaining single-mode ytterbium-doped fiber amplifier with distributed narrow passband filtering is demonstrated. The fiber passband is 40 nm wide and centered at 1070 nm for efficient filtering of both short- and long-wavelength amplified spontaneous emission as well as stimulated raman scattering and four-wave-mixing. The fiber shows reduced bend sensitivity, has a mode field diameter of 27 microm and exhibits a slope efficiency of more than 65%.

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