Abstract
In this paper we have implemented a temperature-insensitive polarimetric fiber strain sensor based on a Sagnac birefringence interferometer composed of a short polarization-maintaining photonic crystal fiber (PM-PCF), a 3-dB fiber coupler, and polarization controllers. The PM-PCF used as a sensor head was 2 cm long, which is the shortest length for a sensing element compared to other polarimetric fiber strain sensors using a PM-PCF. The proposed sensor showed a strain sensitivity of ~0.87 pm/μe with a strain measurement range from 0 to 8 me. The temperature sensitivity was also investigated and measured as approximately -12 pm/℃, when ambient temperature changed from 30 to 100℃. This temperature sensitivity is about 82 times smaller than that of conventional polarization-maintaining fiber (approximately -990 pm/℃). In particular, from a practical perspective we have experimentally and theoretically confirmed that the wavelength selected for the indicator dip location does not make a significant difference in the strain sensitivity.Keywords: Optical fiber sensor, Strain sensor, Polarization-maintaining photonic crytal fiber, Sagnac birefringence interferometerOCIS codes: (060.2370) Fiber optics sensors; (060.2420) Fibers, polarization-maintaining; (060.5295) Photonic crystal fibers; (350.2460) Filters, interference
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