FIELD: fiber- optical collimators, units for connection of light guides, spectral filters, optical isolators, gauges. SUBSTANCE: device has piece of fiber-optical light guide 1 with jacket 2 and core 3. Core 3 is doped with nitrogen at concentration of 0.01-5 % of atmospheric pressure. Diameter of core 3 is increased and effective refraction index is increased at end 4 of piece 1 due to temperature diffusion. Local temperature diffusion is achieved by means of heating piece 1 by electric arc current of CO laser beam. EFFECT: simplified manufacturing, simplified interface to other fiber-optical units. 6 cl, 6 dwg
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