Open AccessTemperature compensated magnetic field sensing using dual S-bend structured optical fiber modal interferometer cascaded with fiber Bragg grating
Author(s) -
Zhiyong Zhao,
Ming Tang,
Feng Gao,
Peng Zhang,
Li Duan,
Benpeng Zhu,
Songnian Fu,
Jun Ouyang,
Huifeng Wei,
Jinyan Li,
Perry Ping Shum,
Deming Liu
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.027515
Subject(s) - fiber bragg grating , optics , materials science , interferometry , fiber optic sensor , optical fiber , single mode optical fiber , photonic crystal fiber , graded index fiber , polarization maintaining optical fiber , phosfos , physics
A temperature compensated magnetic field strength optical fiber sensor has been proposed and experimentally demonstrated. A fiber Bragg grating (FBG) is cascaded to modal interferometer (MI), which is fabricated by dual S-bend splicing between thin fiber (TF) and single mode fiber (SMF) with intentionally controlled misalignment between cores. We established a modified numerical model to describe the multi-mode interference of this exceptional S-bend and misalignment structure, together with the simulation based on beam propagation method to gain insight into its operation mechanism. The FBG is used to interrogate the temperature change, and then compensate the perturbation of temperature on transmission of the MI. Thanks to the proposed dual S-bend structure and the diameter-thinned TF used here; we have obtained high magnetic sensitivity of -0.0678 dB/Oe using only 4 mm TF after the elimination of ambient temperature change.