Cross-correlated imaging of single-mode photonic crystal rod fiber with distributed mode filtering

Marko Laurila, Roman Barankov, Mette Marie Jørgensen, Thomas Tanggaard Alkeskjold, Jes Broeng, Jesper Lægsgaard, Siddharth Ramachandran

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    Photonic crystal bandgap fibers employing distributed mode filtering design provide near diffraction-limited light outputs, a critical property of fiber-based high-power lasers. Microstructure of the fibers is tailored to achieve single-mode operation at specific wavelength by resonant mode coupling of higher-order modes. We analyze the modal regimes of the fibers having a mode field diameter of 60 µm by the cross-correlated (C2) imaging method in different wavelength ranges and evaluate the sensitivity of the modal content to various input-coupling conditions. As a result, we experimentally identify regimes of resonant coupling between higher-order core modes and cladding band. We demonstrate a passive fiber design in which the higher-order modal content inside the single-mode guiding regime is suppressed by at least 20 dB even for significantly misaligned input-coupling configurations.
    Original languageEnglish
    JournalOptics Express
    Issue number8
    Pages (from-to)9215-9229
    Publication statusPublished - 2013

    Bibliographical note

    This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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