Sensing Characteristics of Long-Period Grating Inscribed in Grapefruit Photonic Crystal Fiber by Femtosecond Laser

Abstract:

A novel method for fabricating long period grating in grapefruit photonic crystal fiber (GPCF) is proposed and demonstrated. An 800nm femtosecond laser is adopted to scan a section of GPCF periodically point-by-point, resulting in effective refractive index periodic demodulation. High resonance of ~17dB is obtained with a grating length of 30 mm. The temperature sensitivity of resonant wavelength 0.03 nm/°C is obtained from 20°C to 120 °C. In addition, the relationship between resonant wavelength and surrounding refractive index (SRI), when LPFG immersed in refractive index of solution of different index, is also researched.

• Periodical: Applied Mechanics and Materials (Volumes 513-517)
• Pages: 4231-4234
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.513-517.4231
• Online since: February 2014
• Authors: Yuan Wei*, Yu Jie Du
• Keywords: Femtosecond Laser, Grapefruit Photonic Crystal Fiber, Long-Period Gratings, Refractive Index, Temperature

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