Journal
IEEE PHOTONICS JOURNAL
Volume 7, Issue 5, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2015.2475636
Keywords
Long period fiber gratings (LPFG); CO2 lasers; photonic bandgap fibers; gas pressure sensors
Funding
- National Natural Science Foundation of China [61425007, 11174064, 61377090, 61575128, 61308027, 61405128]
- Guangdong Provincial Department of Science and Technology [2014A030308007, 2014A030312008, 2014B050504010, 2015B010105007, 2015A030310243]
- Science and Technology Innovation Commission of Shenzhen/Nanshan [KQCX20120815161444632, ZDSYS20140430164957664, KC2014ZDZJ0008A, GJHZ20150313093755757]
- China Postdoctoral Science Foundation [2014M552227, 2015T80913]
- Pearl River Scholar Fellowships
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We reported a gas pressure sensor based on CO2-laser-induced long-period fiber grating (LPFG) in an air-core photonic bandgap fiber (PBF). The LPFG was inscribed in an air-core PBF by the use of an improved CO2 laser system with an ultraprecision 2-D scanning technique, which induced periodic collapses of air holes along the axis of the PBF. Such an LPFG could be used to develop a promising gas pressure sensor with a sensitivity of -137 pm/MPa. Moreover, a simplified fiber model with a relatively similar elastic response was developed to qualitatively study the gas pressure response of the LPFG inscribed in the air-core PBF. A simulated stress distribution along the LPFG revealed that the gas pressure leads to a stress concentration at the collapsed area of the air holes in the fiber cladding, which finally results in a resonant wavelength shift of the LPFG through an elastooptical effect.
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