SINGLE-MODE SINGLE-POLARIZATION LIGHT GUIDE Russian patent published in 2004 - IPC

FIELD: fiber optics, fiber-optical communication lines, design of fiber-optical gyroscopes and fiber pickups of physical quantities. SUBSTANCE: given light guide includes light guiding conductor, reflecting sheath, two bars loading protective sheath and polymer coat. Relation Λ of difference of refractive indices of material of protective sheath and material of reflecting sheath n_k-n_sh correspondingly to difference of refractive indices of material of light guiding conductor and protective sheath n_c-n_k correspondingly assumes value in range 0,5≤Λ≤2 with 3,5•10³≤n_c-n_sh≤7,5•10^-3. Ratio of radius τ of reflecting sheath to radius ρ of light guiding conductor is selected in range 1,5≤τ/ρ≤2,5. Loading bars are fabricated from material with refractive index equal to refractive index n_p.sh of protective sheath of light guide and are placed at distance Δ from light guiding conductor which satisfies condition ρ≤Δ≤2ρ. This approach secures aperture angle 90^°≤α≤100^° of loading bars when viewed from center of light guiding conductor. EFFECT: enlarged width of spectral window of fiber polarizing mode filter and reduced loss of conductive polarization mode. 6 dwg, 4 tbl