Orientation-Dependent Displacement Sensor Using an Inner Cladding Fiber Bragg Grating.
An orientation-dependent displacement sensor based on grating inscription over a fiber core and inner cladding has been demonstrated. The device comprises a short piece of multi-cladding fiber sandwiched between two standard single-mode fibers (SMFs). The grating structure is fabricated by a femtosecond laser side-illumination technique. Two well-defined resonances are achieved by the downstream both core and cladding fiber Bragg gratings (FBGs). The cladding resonance presents fiber bending dependence, together with a strong orientation dependence because of asymmetrical distribution of the "cladding" FBG along the fiber cross-section.
Physics Department, Northwest University, Xi'an 710069, China. ttyang@stumail.nwu.edu.cn.
Tingting
T
Yang
Physics Department, Northwest University, Xi'an 710069, China. xgqiao@nwu.edu.cn.
Xueguang
X
Qiao
Physics Department, Northwest University, Xi'an 710069, China. qzrong2010@gmail.com.
Qiangzhou
Q
Rong
Physics Department, Northwest University, Xi'an 710069, China. vj199107@163.com.
Weijia
W
Bao
femtosecond laser; inner cladding-FBG inscription; orientation bending