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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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SYSNO ASEP 0396748 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Effect of irradiation symmetry of CO2 laser on mode coupling in long-period gratings inscribed in photonic crystal fiber Author(s) Tian, F. (US)
Kaňka, Jiří (URE-Y)
Zou, B. (HK)
Chiang, K.S. (HK)
Du, H. (US)Number of authors 5 Source Title FIBER OPTIC SENSORS AND APPLICATIONS X (Proceedings of SPIE 8722), 8722. - BELLINGHAM : SPIE, 2013 / Udd E. ; Pickrell G. ; Du H.H. - ISSN 0277-786X - ISBN 978-0-8194-9513-6 Number of pages 8 s. Publication form Medium - C Action Conference on Fiber Optic Sensors and Applications X Event date 02.05.2013-03.05.2013 VEvent location Baltimore Country US - United States Event type WRD Language eng - English Country US - United States Keywords Photonic crystal fiber ; long-period grating ; mode coupling Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering R&D Projects LD11030 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support URE-Y - RVO:67985882 UT WOS 000323340200012 DOI 10.1117/12.2016194 Annotation 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 Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2014
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