METALLIZED FIBER LIGHT GUIDE AND PROCESS OF ITS MANUFACTURE Russian patent published in 2002 - IPC

FIELD: optoelectronics, fiber-optical communication lines. SUBSTANCE: fiber light guide includes core, light guiding layer put on core and having refractive index higher than refractive index of core and protective jacket coming in the form of metal film. Light guiding layer is produced in the form of alternating light guiding zones satisfying condition S₁= S₂= ...= S_N, where S_N is area of N-th circular zone, N= 1,2. . . is ordinal number of zone, S_N= 0,5πλ(0,5M)^0,5(r_N1+r_N2), λ being length of wave of radiation transmitted over N-th circular zone, M being number of radiation modes, r_N1 and r_N2- being correspondingly outer and inner radii of N-th circular zone. Layer with definite refractive index is located between every two circular zones, thickness of each layer being equal to 2λ... Process of manufacture of fiber light guide includes drawing of fiber light guide in vacuum, magnetron sputtering of protective jacket in the form of metal film on light guide, heating of metal film to temperature of its softening, cooling of fiber light guide and its reeling up. Drawing and sputtering are conducted in vacuum <10^-3 mm Hg. After drawing fiber light guide is subjected to plasma cleaning. EFFECT: increased power of radiation transmitted over light guide. 3 cl, 4 dwg