LOW-DISPERSION OPTICAL FIBER AND OPTICAL TRANSMISSION SYSTEM WITH USE OF LOW-DISPERSION OPTICAL FIBER Russian patent published in 2003 - IPC

FIELD: fiber-optical communication lines. SUBSTANCE: optical fiber has central core with refractive index n1 and diameter a1, first and second peripheral cores with corresponding indices and diameters n2 and a2, n3 and a3 and sheath with refractive index n_c. Conditions mentioned below are realized: n1>n3>n_c>n2, a1/a2 is equal to 0.4 as minimum and do not exceed 0.7, a3/a2 does not exceed 1.6. Optical transmission system includes low-dispersion optical fiber and device to compensate for dispersion which has negative gradient of chromatic dispersion. EFFECT: provision for reduced chromatic dispersion, increased effective area of core. 10 cl, 6 dwg