Kim, Sunduck Kim, Gil Hwan Hwang, Kyu-Jin Lim, Sun Do Lee, Kwanil Kim, Sang Hyuck Lee, Sang Bae Jeong, Je-Myung 2024-01-20T20:05:01Z 2024-01-20T20:05:01Z 2021-09-05 2009-12 1226-4776 https://pubs.kist.re.kr/handle/201004/131924 A photonic crystal fiber with two large air holes outside the holey cladding region is fabricated to induce an effective long periodic grating (LPG) in the core by an electric arc discharge. We believe that the two large air holes lead to the asymmetric perturbation in the core under the electric arc discharge, thereby introducing the coupling to the first higher-order mode. The transmission characteristics of the PCF with the LPG for the external perturbation such as strain, curvature, and temperature are also investigated. It was found that the shift of resonance peak in the transmission spectrum depends on the bending direction. The curvature of 8.55 m(-1) results in the center wavelength shifts of 1.8; 4.3, and 11 rim for a vertical, diagonal, and horizontal direction of the curvature to the large air-hole alignment, respectively. English OPTICAL SOC KOREA OPTICAL-FIBER SENSITIVITY FABRICATION SENSORS Investigation of an Arc-induced Long Period Fiber Grating Inscribed in a Photonic Crystal Fiber with Two Large Air Holes Article 10.3807/JOSK.2009.13.4.428 1 JOURNAL OF THE OPTICAL SOCIETY OF KOREA, v.13, no.4, pp.428 - 433 JOURNAL OF THE OPTICAL SOCIETY OF KOREA 13 4 428 433 scie scopus kci ART001396987 000273710400004 2-s2.0-76849117334 Optics Optics Article OPTICAL-FIBER SENSITIVITY FABRICATION SENSORS Long period fiber grating Photonic crystal fiber Sensor