Journal
IEEE SENSORS JOURNAL
Volume 16, Issue 11, Pages 4253-4257Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2016.2542842
Keywords
Chiral long-period gratings; optical sensor
Funding
- National Natural Science Foundation of China [61377083, 61077065]
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A chiral long-period grating (CLPG) was fabricated successfully by scanning CO2 laser in a twisted conventional single-mode fiber. The strong mode coupling can be achieved in a short grating length. The sensing characteristics of the CLPGs were investigated experimentally. Compared with the conventional long-period fiber gratings, the CLPGs were found to have the similar temperature and refractive index sensitivities and much higher torsion, bending, and strain sensitivities. The high sensitivity of the CLPG can be attributed to the screw-type waveguide structure induced by the scanning laser in the twisted fiber. The proposed CLPGs could have great potential applications as filters and optical sensors.
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