Arc-induced long-period gratings in aluminosilicate glass fibers

Abstract

Permanent long-period gratings were written using arc discharges in two aluminosilicate fibers, one of which was doped with erbium. Reversible gratings were also mechanically induced in both fibers. The thermal behavior of the arc-induced gratings was investigated at up to 1100 degrees C. It was found that the shift of the resonant wavelengths exhibited a well-defined linear dependence on temperature up to 700 degrees C.

Fiber-Optic Sensors for Measurements of Torsion, Twist and Rotation: A Review

“…They can be written in any type of optical fiber, such as standard telecommunication fibers [63], PCF fibers, holey fibers and doped fibers [64,65]. The concern in arc gratings is Polarization Dependent Loss (PDL), which results from birefringence induced in the fiber core due to one side exposure and these values depend on fiber fabrication parameter, such as pulling tension [66].…”

Long-Period Fiber Gratings in Active Fibers

“…This, however, requires LPGs with sub-100-µm period, as the effective refractive index of the core mode is significantly higher than in low-numerical aperture fibers (e.g., telecom SMF-28 with numerical aperture of 0.12). Unfortunately, this is prohibitive for CO2 [14] and arc [15] LPG inscription techniques -both of them operate on a principle of a local heating of the fiber and it is difficult to heat a fiber with 125 µm diameter over length significantly shorter than that. The techniques suitable are UV-writing [16] and fs-laser writing [17].…”

All fiber components for multimode SDM systems

“…However fixed gratings offer higher stability and increased flexibility of design. LPGs can be fabricated by several methods and we selected the arc technique [7]. SMF is spliced to both ends of the dual mode fiber and two mode strippers formed on either side of the grating region.…”