SMS Fiber Sensor Utilizing a Few-Mode Fiber Exhibits Critical Wavelength Behavior

Author

Salik, Ertan ; Medrano, Michael ; Cohoon, Gregory ; Miller, John ; Boyter, Chris ; Koh, Joseph

Author_Institution

Dept. of Phys. & Astron., California State Polytech. Univ., Pomona, CA, USA

Volume

24

Issue

7

fYear

2012

fDate

4/1/2012 12:00:00 AM

Firstpage

593

Lastpage

595

Abstract

We experimentally demonstrate the existence of a critical wavelength in the 1.4-1.6-μm optical communication window for the single-mode-multimode-single-mode (SMS) fiber sensor utilizing a few-mode fiber (FMF). Peaks near the critical wavelength exhibit higher sensitivity to temperature or strain. A theoretical analysis of this SMS structure shows that the critical wavelength behavior is mainly governed by the fiber refractive index (RI) profile with no significant effect from material dispersion. There is only one critical wavelength in the range where the LP₀₂ mode of the FMF is supported. Small alterations of the fiber RI profile can tune the critical wavelength.

Keywords

fibre optic sensors; optical communication; refractive index; SMS fiber sensor; critical wavelength; few mode fiber; fiber refractive index profile; material dispersion; optical communication; single mode multimode single mode fiber sensor; wavelength 1.4 mum to 1.6 mum; Optical fiber dispersion; Optical fiber sensors; Optical fibers; Sensitivity; Strain; Temperature sensors; Modal interferometers; optical fiber devices; optical fiber sensors;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2184090

Filename

6138899