17 February 2010 Photonic crystal fiber with resonant-coupling higher-order-mode suppression
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Non-axially symmetric micro-structured fibers including photonic crystal fibers and leakage channel fibers have been investigated as possible means to enable mode field area scaling while retaining low-loss fundamental mode propagation. In this paper we report on the theoretical and experimental investigation of a photonic crystal fiber designed for single-polarization operation in a coiled configuration incorporating a resonant higher-order mode suppressing structure within the cladding. We performed spatially and spectrally resolved (S2) imaging of the output of a 18.6 meter length of fiber when seeded with a broadband ASE source. We observed no trace of any localized or distributed scattering to higher order modes in the spatially resolved Fourier transformed output spectra indicating robust single-transverse-mode output.
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Benjamin G. Ward, Benjamin G. Ward, Dallas M. Wright, Dallas M. Wright, Casey J. Eicholt, Casey J. Eicholt, Chad G. Carlson, Chad G. Carlson, "Photonic crystal fiber with resonant-coupling higher-order-mode suppression", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 758011 (17 February 2010); doi: 10.1117/12.845599; https://doi.org/10.1117/12.845599

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