Fabrication of a Screw-Shaped Long-Period Fiber Grating for Refractive Index Sensing

作者：Cho Yonghyun; Ahmed Farid; Joe Hang Eun; Yun Huitaek; Min Byung Kwon; Jun Martin B G^*

来源：IEEE Photonics Technology Letters, 2017, 29(24): 2242-2245.

DOI：10.1109/LPT.2017.2765598

• Femtosecond laser
• symmetric index modulation
• fiber rotating
• screw-shaped grating

A process for femtosecond laser-based manufacturing was proposed to fabricate a long-period fiber grating (LPFG) with a screw shape. The screw-shaped LPFG was continuously inscribed by single laser scanning, which results in the improvement of fabrication time. For the single laser scanning, an optical fiber was traveled along fiber axis and rotated about the fiber axis. The 44.65-mm-long LPFG with a screw shape and the period of 450 mu m was fabricated about 17 min, and its sensitivity was 48 similar to 51 nm/RIU for the glycerin solutions. The proposed process enables us to produce the screw-shaped LPFGs with fast manufacturing time and reliable performance compared with the process with multi-path scanning.

• 出版日期2017-12-15