TY - JOUR
T1 - Femtosecond Laser Refractive Index Modulated Multimode Fiber for High Sensitivity Vector Bending Measurement
AU - Wang, Ruoning
AU - Tian, Ke
AU - Zhang, Meng
AU - Zhao, Zhiyuan
AU - Farrell, Gerald
AU - Lewis, Elfed
AU - Wang, Pengfei
N1 - Publisher Copyright:
© 1983-2012 IEEE.
PY - 2022/10/1
Y1 - 2022/10/1
N2 - A femtosecond (fs) laser fabricated refractive index (RI) modulated multimode fiber (MMF) for high sensitivity vector bending measurement is presented. A fs laser-induced local positive RI modulation in the MMF core results in a non-circular symmetric RI distribution of the MMF. Such a RI-modulated MMF used in single-mode-multimode-single-mode (SMS) fiber structure exhibits a bending-dependent spectral shift response. Due to the large core size of the MMF, the RI modulated area can be relatively far away from the fiber core axis, which in turn results in a greater effective RI change during bending. Experimental results show that the highest bending sensitivity of -45.8 nm/m-1 is achieved at 0° orientation with the resonant wavelength of 1554.4 nm. In addition to its high sensitivity and simple structure, this vector bending sensor exhibits ultra-low temperature crosstalk in bending measurements, as low as 0.0002 m-1/°C, which makes it an excellent candidate for accurate vector bending monitoring applications.
AB - A femtosecond (fs) laser fabricated refractive index (RI) modulated multimode fiber (MMF) for high sensitivity vector bending measurement is presented. A fs laser-induced local positive RI modulation in the MMF core results in a non-circular symmetric RI distribution of the MMF. Such a RI-modulated MMF used in single-mode-multimode-single-mode (SMS) fiber structure exhibits a bending-dependent spectral shift response. Due to the large core size of the MMF, the RI modulated area can be relatively far away from the fiber core axis, which in turn results in a greater effective RI change during bending. Experimental results show that the highest bending sensitivity of -45.8 nm/m-1 is achieved at 0° orientation with the resonant wavelength of 1554.4 nm. In addition to its high sensitivity and simple structure, this vector bending sensor exhibits ultra-low temperature crosstalk in bending measurements, as low as 0.0002 m-1/°C, which makes it an excellent candidate for accurate vector bending monitoring applications.
KW - Femtosecond laser
KW - multimode interference
KW - refractive index modulation
KW - vector bending measurement
UR - http://www.scopus.com/inward/record.url?scp=85135743767&partnerID=8YFLogxK
U2 - 10.1109/JLT.2022.3195096
DO - 10.1109/JLT.2022.3195096
M3 - Article
AN - SCOPUS:85135743767
SN - 0733-8724
VL - 40
SP - 6501
EP - 6507
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 19
ER -