7 March 2014 Time-frequency-domain dispersion measurement in rare earth doped large effective mode area multicore fibers
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Ytterbium doped multicore fibers have been recently employed in the field of high power and Quasi-Gaussian beam lasers to design truly single-mode multicore fiber lasers. The special design of these fibers offers low bending loss even for compact high power lasers and amplifiers. Moreover, the Multi-core fiber amplifier possesses a large effective mode area which results in a significant decrease of the related nonlinear effects. In the paper, modal resolved group-velocity dispersion measurements in active multicore fibers are performed using time-frequency-domain white-light interferometry. A Mach-Zehnder-type interferometer with dual-channel detection in the spectral range from 0.4 μm up to 1.7 μm and a home-made supercontinuum source are used. Temporally resolved spectrograms recorded at distinct delay positions enable the detection of interference fringes for the equalizationwavelength. The group-velocity dispersion can be derived by applying a Sellmeier polynomial fit to the wavelength dependent differential group delay function. The dispersion parameters for several LMA fibers are investigated over a broad spectral range of about 1.3 μm.
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T. Baselt, T. Baselt, Ch. Taudt, Ch. Taudt, P. Hartmann, P. Hartmann, "Time-frequency-domain dispersion measurement in rare earth doped large effective mode area multicore fibers", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89612Z (7 March 2014); doi: 10.1117/12.2039152; https://doi.org/10.1117/12.2039152

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