Alexander S. Biriukov

Light transmission in negative curvature hollow core fiber in extremely high material loss region

In this paper we demonstrate the light transmission in a spectral range of 2.5 to 7.9 µm through a silica negative curvature hollow core fiber (NCHCF) with a cladding consisting of eight capillaries. A separation between the cladding capillaries was introduced to remove the additional resonances in the transmission bands. The measured optical loss at 3.39 µm was about 50 dB/km under a few modes waveguide regime.

Demonstration of CO 2 -laser power delivery through chalcogenide-glass fiber with negative-curvature hollow core

A technologically simple optical fiber cross-section structure with a negative-curvature hollow-core has been proposed for the delivery of the CO2 laser radiation. The structure was optimized numerically and then realized using Te20As30Se50 (TAS) chalcogenide glass. Guidance of the 10.6 µm СО2-laser radiation through this TAS-glass hollow-core fiber has been demonstrated. The loss at λ=10.6 μm was amounted ~11 dB/m. A resonance behavior of the fiber bend loss as a function of the bend radius has been revealed.

Electrostrictive response in single-mode ring-index-profile fibers

We have theoretically investigated for the first time the electrostrictive response in a single-mode ring-core fiber. It has been found that the electrostrictive response function strongly differs from that of standard fibers with a Gaussian light intensity profile.

Demonstration of waveguide regime for chalcogenide hollow-core optical fiber with negative curvature of core boundary from mid- to far-infrared

A new, technologically simple structure of hollow-core optical fiber is proposed, which cladding is formed by eight contiguous capillaries, the surface of the hollow core having a negative curvature. This fiber design provides good light localization: the ratio of radiation intensities at the core center and at the surface of the capillary amounts to eight orders of magnitude. We have previously demonstrated that the optical loss in such a fiber can be incomparably lower than in the material from which it is made [1].

Hollow-Core Fiber for Transmission of CO 2 Laser Radiation

A new, technologically simple structure of hollow-core optical fiber is proposed; the propagation of CO2 laser radiation in a hollow-core chalcogenide glass fiber is demonstrated.

Electrostrictive response in single-mode ring-index profile fibers with large effective mode area

We present the theoretical investigation of electrostrictive response of single-mode ring-index profile fibers with a large effective mode area, the results obtained show that the acoustic effect should be taken into account when a large effective mode area fibers are designed for applications in high bit rate systems.

Thermal effect of stimulated Raman scattering in silica optical fibers

It is shown that under certain conditions, the chief mechanism limiting the maximal light intensity transmittable through silica fiber is stimulated Raman scattering. The threshold intensities leading to irreversible fiber damage via overheating have been estimated on the basis of an approximate theoretical model of thermal effect of stimulated Raman scattering. Dependencies of the threshold intensity on the physico-chemical properties of the fiber materials and on the sizes of the fiber cross-section have been determined.