Intensity based optical fiber strain sensor using long period grating and core mode blocker

摘要

We report an intensity based fiber strain sensor using a long period fiber grating (LFPG) pair along with an in-line core mode blocker. By sandwiching the core mode blocker fabricated by arc method between a LPFG pair, an band-pass filter was formed. Measured by optical power meter at one specific wavelength, the transmitted power was found to decrease as a variation of axial strain is applied on one single LPFG, therefore we can measure the applied strain by measuring the transmitted power. The measured response of voltage for change of strain was 6.37pV/ με.