TY - JOUR
T1 - Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect
AU - Bai, Xuekun
AU - Wang, Haotian
AU - Wang, Shaofei
AU - Pu, Shengli
AU - Zeng, Xianglong
PY - 2015/10/1
Y1 - 2015/10/1
N2 - We research the refractive index (RI) sensing characteristic based on the bandpass spectrum caused by the self-imaging effect in the single-mode-multimode-single-mode (SMS) fiber structure theoretically and experimentally. A new selectable parameter, i.e., no-core fiber (NCF) length, is investigated for improving the sensitivity of the sensor. The results show that the sensor's sensitivity will be enhanced by shortening the NCF length when the self-imaging number remains constant. Experimentally, a maximum sensitivity of 1923 nm/RIU (RI unit) has been achieved when the RI ranges from 1.334 to 1.434. This work demonstrates a method to improve the sensitivity of SMS-fiber-structure-based RI sensors featuring a low cost, compact size, low insert loss, and high sensitivity optical fiber RI sensor.
AB - We research the refractive index (RI) sensing characteristic based on the bandpass spectrum caused by the self-imaging effect in the single-mode-multimode-single-mode (SMS) fiber structure theoretically and experimentally. A new selectable parameter, i.e., no-core fiber (NCF) length, is investigated for improving the sensitivity of the sensor. The results show that the sensor's sensitivity will be enhanced by shortening the NCF length when the self-imaging number remains constant. Experimentally, a maximum sensitivity of 1923 nm/RIU (RI unit) has been achieved when the RI ranges from 1.334 to 1.434. This work demonstrates a method to improve the sensitivity of SMS-fiber-structure-based RI sensors featuring a low cost, compact size, low insert loss, and high sensitivity optical fiber RI sensor.
U2 - 10.1117/1.OE.54.10.106103
DO - 10.1117/1.OE.54.10.106103
M3 - Article
SN - 0091-3286
VL - 54
SP - 106103
JO - Optical Engineering
JF - Optical Engineering
ER -