Title :
Highly Sensitive Optical Refractometer Based on Edge-Written Ultra-Long-Period Fiber Grating Formed by Periodic Grooves
Author :
Zhu, Tao ; Song, Yun ; Rao, Yunjiang ; Zhu, Yong
Author_Institution :
Key Lab. of Optoelectron. Technol. & Syst., Chongqing Univ., Chongqing
fDate :
6/1/2009 12:00:00 AM
Abstract :
An ultra-long-period fiber grating with periodic groove structure (G-ULPFG) fabricated by using an edge-written method with high-frequency CO2 laser pulses is proposed in this paper. The experimental results show that the different resonant peaks of the G-ULPFG have different temperature and refractive index sensitivities and, in particular, the refractive index sensitivity is much larger than that of conventional ULPFG due to the edge-groove structure. Such a kind of G-ULPFGs could be used as a highly sensitive optical refractometer with temperature self-compensation.
Keywords :
diffraction gratings; optical fibres; periodic structures; refractive index; refractometers; edge-groove structure; edge-written ultralong-period fiber grating; optical refractometer; periodic groove structure; refractive index; Fiber gratings; Fiber lasers; Optical pulses; Optical refraction; Optical sensors; Optical variables control; Periodic structures; Refractive index; Resonance; Temperature sensors; Groove structure; optical fiber sensing; refractometer; ultra-long-period fiber grating;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2009.2021187
