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Long-period gratings inscribed in photonic crystal fiber by symmetric CO2 laser irradiation
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SYSNO ASEP 0396764 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Long-period gratings inscribed in photonic crystal fiber by symmetric CO2 laser irradiation 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 Optics Express. - : Optical Society of America - ISSN 1094-4087
Roč. 21, č. 11 (2013), s. 13208-13218Number of pages 11 s. Publication form Print - P Language eng - English Country US - United States Keywords REFRACTIVE-INDEX ; FABRICATION ; SENSORS Subject RIV JB - Sensors, Measurment, Regulation R&D Projects LH11038 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support URE-Y - RVO:67985882 UT WOS 000319814900026 DOI 10.1364/OE.21.013208 Annotation Long-period gratings (LPGs) inscribed in endlessly single mode (ESM) photonic crystal fibers (PCFs) with symmetric and asymmetric CO2 laser irradiation are investigated both numerically and experimentally. Parallel results from conventional single mode fibers (SMFs) are presented for comparison. Theoretical predictions, transmission measurements, and near-field imaging indicate that, regardless of the fiber type, symmetric index perturbation induced by laser irradiation with the aid of a 120 degrees goldcoated reflecting mirror results in LP0n symmetric mode coupling, while asymmetric irradiation without using the mirror leads to LP1n asymmetric mode coupling. Our results show that, because of the azimuthally anisotropic hexagonal cladding structure, symmetric irradiation yields far more reproducible LPGs in PCFs than asymmetric irradiation. On the other hand, the irradiation symmetry has little effect on the reproducibility of LPGs inscribed in SMFs due to the isotropy of its all-solid cladding structure 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
Number of the records: 1