SINGLE-MODE FIBER-OPTICAL WAVEGUIDE WITH CONTROLLED DISPERSION AND PROCESS OF ITS MANUFACTURE ( VARIANTS ) Russian patent published in 2002 - IPC

FIELD: electronics, optics. SUBSTANCE: single-mode fiber-optical waveguide is designed to diminish energy loss caused by four- wave shift. Waveguide includes region of glass core having profile of distribution of refractive index and surrounded by layer of glass jacket with refractive index n_c less than at least part of profile of refractive index of specified region of glass core. Waveguide includes collection of sections along its length and has variable total dispersion which changes its sign from positive to negative and from negative to positive from one section to another section along length of waveguide. Variable total dispersion includes at least first total dispersion D_i of one sign over some sections and second total dispersion D_j of opposite sign over other sections. Each section comprises segments ( (d_li,d_lj) ). Each segment has corresponding constant total dispersion ( (D_i,D_j) ) and length of wave of zero dispersion λ₀ varies along length of waveguide between first range including wave lengths from 1480 to 1535 nm with total dispersion equal to D_i and second range including wave lengths from 1565 to 1680 nm with total dispersion equal to D_j. Communication line in which sections of signal transmission having zero dispersion have small length is formed by proper selection of changes of values of total dispersion and lengths of sections. Change of total dispersion leads to fact that communication line exerts dispersion effect specified in advance on passing signal in specified range of lengths of waves. In agreement with invention properties of waveguide selected from group including geometry of waveguide, refractive index of waveguide, profile of distribution of waveguide and composition of waveguide are altered to change dispersion along length of waveguide. EFFECT: invention provides for reduction of optical losses and dispersion to specified value. 14 cl, 38 dwg _