TY - JOUR
T1 - Microfiber Fabry-Perot interferometer for dual-parameter sensing
AU - Zhang, Jiejun
AU - Sun, Qizhen
AU - Liang, Ruibing
AU - Jia, Weihua
AU - Li, Xiaolei
AU - Wo, Jianghai
AU - Liu, Deming
AU - Shum, Perry Ping
PY - 2013/5/15
Y1 - 2013/5/15
N2 - We propose and demonstrate a microfiber Fabry-Perot interferometer (MFPI) fabricated by taper-drawing microfiber at the center of a uniform fiber Bragg grating (FBG). The MFPI employing the two separated sections of FBG as reflectors and a length of microfiber as its cavity is derived. Theoretic study shows that the reflection spectrum of such MFPI is consisted of two parts-interference fringes induced by multi-beam interference and reflection spectrum envelope induced by FBGs. Temperature affects both interference fringes and reflection wavelength of FBGs while ambient refractive index (RI) only influences the interference fringes, i.e., MFPI has different response to temperature and RI. Therefore, MFPI for simultaneous sensing of RI and temperature is experimentally demonstrated by tracking a reflection peak of interference fringes and the Bragg wavelength of the FBGs, which are respectively assisted by frequency domain processing and Gaussian fitting of the optical spectrum. Consequently, wavelength measurement resolution of 0.5 pm is realized.
AB - We propose and demonstrate a microfiber Fabry-Perot interferometer (MFPI) fabricated by taper-drawing microfiber at the center of a uniform fiber Bragg grating (FBG). The MFPI employing the two separated sections of FBG as reflectors and a length of microfiber as its cavity is derived. Theoretic study shows that the reflection spectrum of such MFPI is consisted of two parts-interference fringes induced by multi-beam interference and reflection spectrum envelope induced by FBGs. Temperature affects both interference fringes and reflection wavelength of FBGs while ambient refractive index (RI) only influences the interference fringes, i.e., MFPI has different response to temperature and RI. Therefore, MFPI for simultaneous sensing of RI and temperature is experimentally demonstrated by tracking a reflection peak of interference fringes and the Bragg wavelength of the FBGs, which are respectively assisted by frequency domain processing and Gaussian fitting of the optical spectrum. Consequently, wavelength measurement resolution of 0.5 pm is realized.
KW - Fabry-Perot
KW - fiber gratings
KW - microfiber interferometer
KW - optical fiber sensors
UR - http://www.scopus.com/inward/record.url?scp=84876024128&partnerID=8YFLogxK
UR - http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6477066
U2 - 10.1109/JLT.2013.2252145
DO - 10.1109/JLT.2013.2252145
M3 - Article
AN - SCOPUS:84876024128
SN - 0733-8724
VL - 31
SP - 1608
EP - 1615
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 10
ER -