V.E. Ustimchik - Post-graduate Student, Moscow Institute of Physics and Technology, Engineer, Kotelnikov IRE RAS. E-mail: ustimchikv@gmail.com Yu.K. Chamorovskii - Ph.D. (Phys.-Math.), Leading Researcher, Kotelnikov IRE RAS V.N. Filippov - Ph.D. (Phys.-Math.), Researcher, Optoelectronic Research Center, Tampere University of Technology, Finland S.A. Nikitov - Dr.Sc. (Phys.-Math.), Corresponding Member of RAS, Acting Director, Head of laboratory, Kotelnikov IRE RAS

This paper presents the results of experimental and theoretical study of two type single-mode optical fiber properties - tapered double-clad optical fiber with a core diameter of 100 microns and cylindrical fiber with W-refractive index profile with a core diameter of 50 microns weakly sensitive to macro bends. Such fibers are characterized by a record large effective area of the fundamental mode and can be advantageously used in high power laser systems with the aim of lowering the non-linear effects threshold.

 

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