Open AccessSpatially resolved modal spectroscopy of Er:Yb doped multifilament-core fiber amplifier
Author(s) -
Julien Le Gouët,
Julien Delaporte,
Laurent Lombard,
Guillaume Canat
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.005566
Subject(s) - materials science , optics , photonic crystal fiber , polarization maintaining optical fiber , fiber , core (optical fiber) , graded index fiber , dispersion shifted fiber , mode volume , fiber laser , optical fiber , fiber optic sensor , single mode optical fiber , plastic optical fiber , physics , composite material
The spatially resolved spectral (S2) imaging method is applied on an active microstructured fiber, with a multi-filament core (MFC). This type of fiber has been designed to be the last amplifying stage of a source for a long range coherent lidar. Studying the influence of the bending radius on the modal content with or without gain, we demonstrate that an upper-bound of the high-order modes content can be found by performing the S2 imaging on the bleached fiber. S2 imaging is then used to verify that the output beam of the MFC fiber can be made effectively single-mode. We also show that it can be simply adapted for measuring the fiber birefringence. Finally, a comparison of the MFC fiber mode area with that of a standard large mode area Erbium doped step index fiber illustrates the interest of the MFC structure for high power amplifiers.