Refractive-Index Insensitive Long-Period Fiber Gratings Point-by-Point Inscribed by CO₂ Laser for Fiber Sensors and Lasers
This paper reports a long-period fiber gratings(LPFG) fabricated on a double-clad fiber (DCF) by the CO2 laser point-by-point technique. The LPFG is tested by measuring temperature and refractive index (RI) of different liquids. The results show that the LPFG inscribed on the DCF has no measurable sensitivity to external RI but has a high sensitivity for temperature. The measured temperature sensitivity is ~0.11 nm/°C, about 10 times higher than that of conventional FBGs. Such LPFGs can be used as a modulator in fiber lasers or temperature/strain sensors in applications where the surrounding RI is prone to variation, such as simultaneous measurement of the temperature and RI of chemical reactions.
Q. Han et al., "Refractive-Index Insensitive Long-Period Fiber Gratings Point-by-Point Inscribed by CO₂ Laser for Fiber Sensors and Lasers," Proceedings of SPIE, Optical Components and Materials IX, vol. 8257, SPIE, Jan 2012.
The definitive version is available at http://dx.doi.org/10.1117/12.909105
SPIE OPTO (2012: Jan. 25-26, San Francisco, CA)
Electrical and Computer Engineering
Keywords and Phrases
Double-clad fiber; Fiber Sensor; High sensitivity; Long period fiber grating; Measuring temperature; Simultaneous measurement; Temperature sensitivity, Carbon dioxide; Diffraction gratings; Fiber lasers; Fiber optic sensors; Lasers; Refractive index, Fibers
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