Analysis of Faraday effect in multimode tellurite glass optical fiber for magneto-optical sensing and monitoring applications

Abstract

The design and fabrication of a tellurite glass multimode optical fiber for magneto-optical applications are presented and discussed. The analysis of the polarization shows that an optical beam, linearly polarized at the fiber input, changes to elliptically polarized with an ellipticity of 1∶4.5 after propagating down the fiber. However, the elliptical distribution remains unchanged with or without an applied magnetic field, demonstrating that no circular dichroism occurs within the fiber. The Verdet constant of the tellurite glass in the fiber is measured to be 28±0.5 rad·(T·m)-1, diverging by less than 3% from the Verdet constant found on the same glass composition in bulk form. These results demonstrate the feasibility to develop reliable tellurite glass fibers by the preform drawing method for magneto-optical applications.

Synthesis and characterization of a titanium phosphate‐tellurite glass for Faraday rotators

“…TeO 2 glasses can be classified into either Te‐rich glasses with around 50 mol% TeO 2 in binary and ternary systems with application in lasers, optical fibers, amplifiers, 1‐11 or into low‐Te glasses where TeO 2 is only added in low amounts as dopant 3,12‐15 . TeO 2 glasses are promising low phonon hosts for rare‐earth elements 1,16‐23 or present luminescence properties themselves 2 .…”

Faraday rotation influence factors in tellurite-based glass and fibers

“…From the Biot-Savart law, the theoretical magnetic field density distribution along the glass is given by Eq. (9). The magnetic field density was measured using a teslameter (PHYWE, 13610-93), at several positions along the solenoid, which was excited by a current of 10 A.…”

“…In recent years, different MO fibers for Faraday rotation applications were reported, for example, heavily terbiumdoped silica preform [5][6][7] tellurite fiber (this group), As-S fiber [8,9] and CdSe quantum-doped Bi:YIG [10] glass fiber. As-S glass fiber has big stable problem during the whole fabrication process, and its MO property depends greatly on temperature.…”

Design and Development of a Low-Cost Optical Current Sensor

“…When a light beam passes through a glass medium in a magnetic field, its polarization vector is rotated in proportion to the field. The Verdet constant V relates the line integral of the magnetic field B to the rotation of the polarization plane of a linearly polarized, according to the equation [20–22]: $\phi =V⨖\mathbf{B}\mathrm{d}\mathbf{l}$…”