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Effect of irradiation symmetry of CO2 laser on mode coupling in long-period gratings inscribed in photonic crystal fiber

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    0396748 - URE-Y 2014 RIV US eng C - Conference Paper (international conference)
    Tian, F. - Kaňka, Jiří - Zou, B. - Chiang, K.S. - Du, H.
    Effect of irradiation symmetry of CO2 laser on mode coupling in long-period gratings inscribed in photonic crystal fiber.
    FIBER OPTIC SENSORS AND APPLICATIONS X (Proceedings of SPIE 8722). Vol. 8722. BELLINGHAM: SPIE, 2013 - (Udd, E.; Pickrell, G.; Du, H.). ISBN 978-0-8194-9513-6. ISSN 0277-786X.
    [Conference on Fiber Optic Sensors and Applications X. Baltimore (US), 02.05.2013-03.05.2013]
    R&D Projects: GA MŠk(CZ) LD11030
    Institutional support: RVO:67985882
    Keywords : Photonic crystal fiber * long-period grating * mode coupling
    Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

    Long-period gratings (LPG) are inscribed in endlessly single mode (ESM) photonic crystal fiber (PCF) and conventional single mode fiber (SMF) with symmetric and asymmetric CO2 laser irradiation. Transmission measurements and near-field imaging indicate that symmetric index perturbation induced by laser irradiation with the aid of a 120 degrees gold-coated reflecting mirror results in LP0n symmetric mode coupling, while asymmetric irradiation without using the mirror leads to LP1n asymmetric mode coupling for both fiber types. Symmetric irradiation yields far more reproducible LPG in PCF than asymmetric irradiation. On the other hand, the irradiation symmetry has little effect on the reproducibility of LPG inscribed in SMF due to the isotropy of its all-solid cladding structure. The removal of the outer solid cladding of PCF-LPG results in a significant change in its transmission characteristics, which provides rich information on the refractive index perturbation and mode field distribution in the outer solid cladding of PCF-LPG
    Permanent Link: http://hdl.handle.net/11104/0224491
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