Title :
Modal dependence of the photoelastic coefficient in multimode, step-index optical fiber time domain systems
Author :
Vengsarkar, Ashish M. ; Thomas, Daniel D. ; Zimmermann, Bernd D. ; Claus, Richard O.
Author_Institution :
Fiber & Electro-Opt. Res. Center, Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
A simple ray-optic approach for the analysis of strained step-index multimode fibers is shown to lead to the determination of the photoelastic coefficient in an optical-fiber time-domain system. The theoretical model includes the dependence of the photoelastic coefficient a on the modal content of the fiber and explains some of the experimental discrepancies observed in high-resolution reentrant-loop-based sensing systems. For high-step-index 200-240 mu m fibers with higher numerical resolution, the value of a is shown to vary from -0.2 to -0.3, which matches closely with experimental results.<>
Keywords :
fibre optics; optical fibres; photoelasticity; refractive index; time-domain reflectometry; high-resolution reentrant-loop-based sensing systems; modal content; modal dependence; numerical resolution; optical-fiber time-domain system; photoelastic coefficient; ray-optic approach; strained step-index multimode fibers; theoretical model; Artificial intelligence; Optical fiber cables; Optical fiber sensors; Optical fiber testing; Optical fibers; Optical pulses; Optical refraction; Optical sensors; Photoelasticity; Pulse measurements;
Journal_Title :
Photonics Technology Letters, IEEE
