Abstract
We report an intensity-based fiber strain sensor using a pair of long-period fiber gratings (LPFGs) and an in-line core mode blocker. By inserting a core mode blocker fabricated by the arc discharge method between two LPFGs, a band-pass filter can be formed. We used an LED and an optical power meter to measure the transmittance near the resonance wavelength of the LPFGs and we obtained a relation between the axial strain applied on one of the LPFGs and the transmitted power. The measurement results indicate that the sensitivity of the power meter output voltage to the applied strain is 6.37 pV με−1.
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