Han, Young-Geun Kim, Gilhwan Lee, Kwanil Lee, Sang Bae Jeong, Chang Hyun Oh, Chi Hwan Kang, Hee Jeon 2024-01-21T00:30:49Z 2024-01-21T00:30:49Z 2021-09-02 2007-10-01 1094-4087 https://pubs.kist.re.kr/handle/201004/134048 We discuss bending properties of a long-period fiber grating (LPFG) inscribed into a holey fiber (HF) depending on an axial rotation angle. High quality of the HF-based LPFG with a high extinction ratio of more than 20 dB is achieved. The proposed HF-based LPFG has bending insensitivity under a certain range of the bending curvature. As the bending curvature is higher than 4 m(-1), the center wavelength of the grating is shifted into the shorter wavelength. Bending sensitivity of the HF-based LPFG is changed by an axial rotation angle, which shows its dependence on the rotational orientation. We measure the transmission characteristics of the HF-based LPFG with the ambient index change. The HF-based LPFG has ambient index insensitivity because of the air holes in the inner cladding. (c) 2007 Optical Society of America. English OPTICAL SOC AMER PHOTONIC CRYSTAL FIBER TEMPERATURE RESONANCE SENSORS Bending sensitivity of long-period fiber gratings inscribed in holey fibers depending on an axial rotation angle Article 10.1364/OE.15.012866 1 OPTICS EXPRESS, v.15, no.20, pp.12866 - 12871 OPTICS EXPRESS 15 20 12866 12871 scie scopus 000250006700031 2-s2.0-35148885122 Optics Optics Article PHOTONIC CRYSTAL FIBER TEMPERATURE RESONANCE SENSORS holey fiber grating rotation angle bending