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Bending and strain sensitivities in a helicoidal long-period fiber gratings

: Jung, H.; Shin, W.; Kim, J.K.; Park, S.-H.; Ko, D.-K.; Lee, J.; Oh, K.


IEEE Photonics Technology Letters 21 (2009), No.17, pp.1232-1234
ISSN: 1041-1135
Journal Article
Fraunhofer IOF ()
bending sensor; CO2 laser; fiber sensor; helicoidal long-period fiber gratings (HLPGs); strain sensor

In this letter, we report bending and strain sensitivities of helicoidal long- period fiber gratings fabricated by twisting single- mode fibers during CO2 laser irradiation. Linear spectral shifts of the resonant wavelengths under the bending and tensile strain were observed with the sensitivities of 11.7 nm/m(-1) and 1.1 pm/mu epsilon, respectively. The corresponding transmission power variations at the resonance wavelength were 4.1 dB/m(-1) and 2.2 x 10(-4) dB/mu epsilon, respectively. Detailed measurement techniques and sensor applications are discussed.