Title :
Temperature-Insensitive Micro Fabry–PÉrot Strain Sensor Fabricated by Chemically Etching Er-Doped Fiber
Author :
Gong, Yuan ; Rao, Yun-Jiang ; Guo, Yu ; Ran, Zeng-Ling ; Wu, Yu
Author_Institution :
Lab. of Broadband Opt. Fiber Transm. & Commun. Networks, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Micro extrinsic Fabry-Perot interferometric (MEFPI) sensors are fabricated by chemically etching Er-doped fibers with mixed hydrochloric (HCl) and hydrofluoric (HF) acid and fusion splicing. Compared with MEFPI sensors fabricated by etched single-mode fibers, the sensor performance is greatly improved by the chemical reaction between HCl acid and doped Er2O3. A maximum visibility of ~24 dB is obtained, comparable to that of MEFPI sensors fabricated by excimer lasers. Our MEFPI sensor has high mechanical strength as the etching rate difference between fiber core and cladding is enlarged. Preliminary results indicate that this kind of sensor is insensitive to temperature while highly sensitive to strain, with sensitivities of ~0.65 pm/degC and ~3.15 pm/muepsiv, respectively.
Keywords :
Fabry-Perot interferometers; etching; fibre optic sensors; mechanical strength; micro-optics; microsensors; optical fibre cladding; optical fibre fabrication; strain sensors; Er-doped fibers; chemically etching; fiber cladding; fiber core; fusion splicing; hydrochloric acid; hydrofluoric acid; mechanical strength; micro extrinsic Fabry-Perot interferometric sensors; single-mode fibers; strain sensor; visibility; Chemical etching; Er-doped fiber (EDF); Fabry–PÉrot; Fiber-optic sensors (FOS); strain;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2032662
