Open AccessHelically twisted long-period fiber gratings of YOFC single-mode fiber with optical fiber welding machine
Author(s) -
Yunfeng Bai,
Zelong He,
Jiyuan Bai,
Suihu Dang
Publication year - 2021
Publication title -
optica applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.204
H-Index - 28
eISSN - 1899-7015
pISSN - 0078-5466
DOI - 10.37190/oa210308
Subject(s) - materials science , long period fiber grating , cladding (metalworking) , optics , welding , single mode optical fiber , optical fiber , wavelength , resonance (particle physics) , fiber , graded index fiber , optoelectronics , fiber optic sensor , composite material , physics , particle physics
The single-mode fiber provided by YOFC inc is employed for spiral processing by commercial welding machine. It can clearly see the periods structure under the light, but there is no obvious deformation of the fiber core, cladding and surface morphology under a microscope. There is an obvious resonant peak near 1560 nm, half peak width is about 25 nm, the depth of the resonant peak closed to –26 dB, when the period is about 411 μm. It agrees with theoretical calculation results according to the long-period fiber grating coupled-mode theory. The resonance wavelength is caused by coupling between the fundamental mode and the LP 14 mode. The responsivities of the helically twisted long-period fiber gratings (H-LPFG) for the temperature is measured, the resonance wavelength is linear with temperature, the slope is 86 pm/℃. Because it is easy to inscribe by commercial welding machine, and has a strong resonance peak, it has potential applications as the temperature sensor.