Highly tunable large core single-mode liquid crystal photonic bandgap fiber

Thomas Tanggaard Alkeskjold, Jesper Lægsgaard, Anders Overgaard Bjarklev, David Sparre Hermann, Jes Broeng, Jun Li, Sebastian Gauza, Shin-Tson Wu

    Research output: Contribution to journalJournal articleResearchpeer-review


    We demonstrate a highly tunable photonic bandgap fiber, which has a large-core diameter of 25 mu m and an effective mode area of 440 mu m(2). The tunability is achieved by infiltrating the air holes of a photonic crystal fiber with an optimized liquid-crystal mixture having a large temperature gradient of the refractive indices at room temperature. A bandgap tuning sensitivity of 27 nm/degrees C is achieved at room temperature. The insertion loss is estimated to be less than 0.5 dB and caused mainly by coupling loss between the index-guided mode and the bandgap-guided mode. (c) 2006 Optical Society of America.
    Original languageEnglish
    JournalApplied Optics
    Issue number10
    Pages (from-to)2261-2264
    Publication statusPublished - 2006


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