Abstract
This paper experimentally demonstrated a singlemode–coreless–singlemode (SCS) fiber structure-based fiber ring cavity laser for strain and temperature measurement. The basis of the sensing system is the multimodal interference occurs in coreless fiber, and the transmission spectrum is sensitive to the ambient perturbation. In this sensing system, the SCS fiber structure not only acts as the sensing head of the sensor but also the band-pass filter of the ring laser. Blue shift with strain sensitivity of \(\sim\)−2 pm/με ranging from 0 to 730 με and red shift with temperature sensitivity of \(\sim\)11 pm/°C ranging from 5 to 75 °C have been achieved. Experimental results also show the proposal has great potential in using long-distance operation. The fiber ring laser sensing system has a optical signal to noise ratio (OSNR) more than 50 and 3 dB bandwidth less than 0.05 nm. The result shows that the coreless fiber has no improvement of the temperature and axial strain sensitivity. However, compared to the common singlemode–multimode–singlemode fiber structure sensors, the laser sensing system has the additional advantages of high OSNR, high intensity and narrow 3 dB bandwidth, and thus improves the accuracy.
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This work was supported by the Major State Basic Research Development Program of China Grant No. 2010CB328206.
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Liu, Zb., Yin, B., Liang, X. et al. Axial strain and temperature sensing characteristics of the single–coreless–single mode fiber structure-based fiber ring laser. Appl. Phys. B 117, 571–575 (2014). https://doi.org/10.1007/s00340-014-5869-z
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DOI: https://doi.org/10.1007/s00340-014-5869-z