RU2000106054A - OPTICAL FIBER WITH CONTROLLED DISPERSION - Google Patents

Claims (1)

1. A single-mode dispersion-compensating optical fiber comprising a central region of a glass core surrounded by a glass layer of the shell and in contact with this layer, wherein at least a portion of the region of the glass core has a refractive index greater than the maximum refractive index of the shell layer, with a central the region of the glass core is characterized by the center, the profile of the refractive index and radius, and the glass layer of the shell is characterized by its profile of the pre omleniya, characterized in that the profile of the central core region refractive index includes at least five sections, wherein the central portion is characterized by a cross sectional area which is substantially symmetrically distributed around the center of the core, a relative refractive index Δ _c%, of 1.5 - 3 , 5%, and with a certain radius, the central section is surrounded by annular sections, the number of which is equal to j, the first ring section adjacent to the central section, the second ring section adjacent t to the first annular section, and the j-th annular section adjoins the (j-1) -th section, so that the core contains a central section and j ring sections, while the corresponding ring sections have a relative refractive index Δ _j % and a width w _j measured along the line corresponding to Δ% = 0, where j is an integer, j≥4, and Δ _c %> Δ _j % ≥ 0 for all j, and the value Δ _j % for even j is greater than the value Δ _j % for odd j, and the corresponding relative refractive indices, the radius of the central section and the width of the annular sections selected s so as to provide a dispersion at a given wavelength that is more negative than approximately -85 ps / nm km. 2. The single-mode optical fiber according to claim 1, characterized in that the attenuation in it does not exceed approximately 1.5 dB / km, and for Δ _c %, approximately equal to 2%, does not exceed 0.55 dB / km, in a given the wavelength range lying within the band from 1520 to 1600 nm, and the loss at the splices of the specified dispersion-compensating optical fiber with a standard single-mode optical fiber communication lines having a stepped refractive index profile is on average 0.5 dB. 3. The single-mode optical fiber according to claim 1, characterized in that j = 4, the corresponding relative refractive indices satisfy the condition Δ _c %> Δ ₂ % ≥ Δ ₄ %> Δ ₁ % ≥ Δ ₃ % ≥ 0, and the core radius is 12 - 18 microns. 4. A single-mode optical fiber according to claim 1, characterized in that j = 6, the corresponding relative refractive indices satisfy the condition

and the radius of the core is 15.5 - 23.5 microns.  5. A single-mode optical fiber according to claim 3 or 4, characterized in that each of the sections forming the core has a certain shape of the refractive index profile, and the shape of the refractive index profile of the central section is selected from the group consisting of α-profile, rounded step profile and the trapezoidal profile of the refractive index.  6. Single-mode optical fiber according to claim 5, characterized in that the value of α lies in the range from approximately 0 to 6. 7. The single-mode optical fiber according to claim 3, characterized in that the profile shape of the refractive index of the first and third annular sections is a horizontal line, Δ ₁ % = Δ ₃ %, Δ ₁ % is essentially zero, and Δ ₂ % and Δ ₄ % are selected independently from each other in the range from 0.2 • Δ _c % to 0.6 • Δ _c %.
8. The single-mode optical fiber according to claim 4, characterized in that the shape of the refractive index profile of the first, third and fifth annular sections is a horizontal line, Δ ₁ % = Δ ₃ % = Δ ₅ %, the value Δ ₁ % is essentially zero and the values Δ ₂ %, Δ ₄ % and Δ ₆ % are selected independently from each other in the range from 0.2 • Δ _c % to 0.6 • Δ _c %.
9. A single-mode optical fiber according to claim 3, characterized in that the profile shape of the refractive index of the second and fourth annular sections is selected from the group consisting of an α-profile, a rounded step profile and a trapezoidal profile of the refractive index.  10. A single-mode optical fiber according to claim 4, characterized in that the profile shape of the refractive index of the second, fourth and sixth annular sections is selected from the group consisting of an α-profile, a rounded step profile and a trapezoidal profile of the refractive index. 11. The single-mode optical fiber according to claim 7, characterized in that the width of the annular regions w ₁ , w ₂ , w ₃ and w ₄ lies in the range from 2.4 to 3.6 μm, from 1.6 to 2.4 μm , from 0.8 to 1.2 microns and from 1.6 to 2.4 microns, respectively. 12. The single-mode optical fiber according to claim 8, characterized in that the width of the annular regions w ₁ , w ₂ , w ₃ , w ₄ w ₅ and w ₆ lies in the range from 2.9 to 4.4 μm, from 1.25 up to 1.90 μm, from 0.75 to 1.10 μm, from 0.9 to 1.35 μm, from 0.9 to 1.35 μm and from 1.65 to 1.10 μm, respectively.