Optical fiber with dispersion shifted

 

The invention is used in fiber-optic communication lines. Single-mode optical fiber has a Central core area, the peripheral area of the core, which is formed around the center and has a refractive index greater than that of the Central region of the core, and located around the periphery of the core shell with a refractive index smaller than that of the peripheral area of the core. In the wavelength range 1490-1625 nm chromatic dispersion of the fiber ranges from -8 to +8 PS/(kmnm), the effective area of the core is 45-130 μm2the slope of the dispersion characteristics of 0.12 PS/(kmnm2) or less. The bending loss of 100 dB/m or less. 20 C.p. f-crystals, 5 Il.

Description text in facsimile form (see graphic part)l

Claims

1. Optical fiber with an offset dispersion containing the core and a shell formed around the outer perimeter of the core, and having such a distribution profile of the refractive index, characterized in that the core is made in the form of a Central region of the core and peripheral about the more high refractive index, than the Central region of the core, and the shell has a lower refractive index than the peripheral region of the core, in which, in the used wavelength range, the choice of which carried out in the range of 1490 - 1625 nanometers, the optical fiber with an offset variance is the effective area of the core 45 of 130 μm2the value of the chromatic dispersion (-8) - (+8) PS/kmnm, the dispersion slope characteristics of 0.12 PS/kmnm2or less, the loss curves of 100 dB/m or less, and the wavelength cutoff, which provides, essentially, a single-mode distribution.

2. Optical fiber with dispersion shifted under item 1, characterized in that the core contains a Central region of the core and peripheral region of the core, and if the relative difference of the refractive index of the Central region of the core is equal to1 with the proviso that the original values are taken refractive index of the shell, and the relative difference of the refractive index of the peripheral area of the core is equal to2 with the proviso that the original values are taken refractive index of the shell, and RA is shown below conditions with (a) through (g): a: 1,35%(2-1) b: 1,2r2/r12.0 V:2of 0.8% and 1.82(r2/r1)23.5 g: if as2 min is set to the greater value of 0.8 or 1.8 (r2/rl)2, the internal volume of the ring is defined as -1r12and the external volume of the ring is specified as2 min(r22-r12), the external volume of the ring to the inner ring volume or greater than or equal to 2, or less than 0.

3. Optical fiber with dispersion shifted under item 2, characterized in that in the used wavelength range, the choice of which carried out in the range of 1490 - 1625 nanometers, the optical fiber with an offset variance is the effective area of the core 75 - 130 μm2the value of the chromatic dispersion from -6 to +6 PS/km/nm, the dispersion slope characteristics of 0.12 PS/km/nm2or less, the loss curves of 100 dB/m or less, and the wavelength cutoff, which provides, essentially, a single-mode distribution.

Elah following areas numeric values: b: 1,2r2/r11.9 in:2of 0.8% and 1.82(r2/r1)23,2 5. Optical fiber with dispersion shifted under item 4, characterized in that the effective area of the core is 85 - 130 μm2.

6. Optical fiber with dispersion shifted under item 2, characterized in that the conditions (b) and (C) are within the following areas numeric values: b: 1,2r2/r11,8
in:2of 0.8% and 1.82(r2/r1)22,7
7. Optical fiber with dispersion shifted under item 6, characterized in that the effective area of the core is 95 to 130 μm2.

8. Optical fiber with dispersion shifted under item 2, wherein r2/r1 is greater than or equal to 1.3 and1 less than or equal to 0%.

9. Optical fiber with dispersion shifted under item 8, characterized in that the steepness of the dispersion characteristics is less than or equal to 0.10 PS/km/nm2.

10. Optical fiber with an offset variance is ardavin, and in the used wavelength range, the choice of which carried out in the range of 1490 - 1625 nanometers, the optical fiber with the dispersion offset is the effective area of the core 45 - 70 μm2the value of the chromatic dispersion (-6) - (+6) PS/km/nm, the dispersion slope characteristics of 0.05 to 0.08 PS/km/nm2losses at bends 100 dB/m or less, and the wavelength cutoff, which provides, essentially, a single-mode distribution.

11. Optical fiber with dispersion shifted under item 10, wherein if the relative difference of the refractive index of the Central region of the core is equal to1 with the proviso that the original values are taken refractive index of the shell, and the relative difference of the refractive index of the peripheral area of the core is equal to2 with the proviso that the original values are taken refractive index of the shell, and the radius of the Central region of the core is equal to r1, and the radius of the peripheral area of the core is equal to r2, then1 takes values from-0.3% to +0.3%, the2 is greater than or equal to 0.8%, and r2/r1 accepts values of 1.4 to 2.5.

12. Optical fiber with dispersion shifted by the CEA p. 1, wherein the core contains a peripheral region of the core, the second annular region, and a third annular region created in this order around the Central region of the core, and in the case when the relative difference of the refractive index and the radius of the Central region of the core, the peripheral area of the core, the second annular region and the third region of the core, respectively, defined as (1, r1), (2, r2), (3, r3), and (4, r4), provided that the initial values taken as the refractive index of the sheath, the optical fiber with the dispersion offset has such a distribution profile of the refractive index, in which the values of1 and3 is set to negative, the value of2 is set to positive, and the value of4 is set greater than or equal to 0, and in the used wavelength range, the choice of which carried out in the range of 1490 - 1625 nanometers, the optical fiber with an offset variance is the effective area of the core 45 to 120 μm2the slope of the dispersion characteristics 0,03 - 0,10 PS/wedge wave cutoff, which provides, essentially, a single-mode distribution.

14. Optical fiber with dispersion shifted by p. 13, characterized in that the optical fiber with an offset variance is the effective area of the core 50 to 75 μm2and the slope of the dispersion characteristics of 0.03 and 0.06 PS/km/nm2.

15. Optical fiber with dispersion shifted under item 14, characterized in that the value of the chromatic dispersion is negative and -0,5%1-0,25%; 0,65 %20,85%; -0,50%3-0,25%; 0,0%40,30%; 1,5r2/r12,5; 1,5(r3-r2)/r12,5; 0,5(r4-r3)/r22,0.

16. Optical fiber with dispersion shifted under item 14, characterized in that the value of the chromatic dispersion is a positive value and -0,5%1-0,05%; 0,75%3-0,15%; 0,0%40,3%; 1,5r2/r12,5; 1,5(r3-r2)/r12,5; 0,5(r4-r3)/r22,0.

17. Optical fiber with dispersion shifted by p. 13, characterized in that the optical fiber with an offset variance is the effective area of the core 75 - 100 µm2and the slope of the dispersion characteristics 0,06 - 0,09 PS/km/nm2.

18. Optical fiber with dispersion shifted under item 17, characterized in that the value of the chromatic dispersion is negative and -0,50%1-0,20%; 0,65%20,85%; -0,50%3-0,25%; 0,0%40,30%; 1,3r2/r12,5; 0,5(r3-r2)/r11,5; 0,5(r4-r3)/r22,0.

19. Optical is a positive value and -0,50%1-0,05%; 0,65%20,85%; -0,50%3-0,15%; 0,0%40,30%; 1,3r2/r13,0; 0,5(r3-r2)/r12,5; 0,5(r4-r3)/r22,0.

20. Optical fiber with dispersion shifted by p. 13, characterized in that the optical fiber with an offset variance is the effective area of the core 100 to 120 μm2and the slope of the dispersion characteristics 0,08 - 0,10 PS/km/nm2.

21. Optical fiber with dispersion shifted by p. 20, characterized in that the value of the chromatic dispersion is a positive value and -0,50%1-0,25%; 0,65%20,75%; -0,50%3-0,25%; 0,0%40,30%; 1,3 1,5; 0,5(r4-r3)/r22,0.

 

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FIELD: optical and electronic industry; production of fiber optic components having electrooptical effect.

SUBSTANCE: the inventions are dealt with optical and electronic industry, and may be used for development engineering of transmitting systems and data processing, in which application of the fiber optic components with electrooptical effect is expedient. The fiber consists of a core, a light conducting shell, a light-absorbing shell containing light-absorbing elements and current-carrying electrodes. The method includes operations of a down-draw of separate glass rods from glasses fillets composing elements of a fiber, piling up a pack of a with the form of cross-section of a hexahedron or a square including piling of electrodes, afterstretching of preform and its pulling into a fiber with application of a polymeric coating. The invention allows to create a single-mode fiber with heightened electrooptical effect from the glasses having a Kerr constant by 1.5 order higher than one of a quartz glass, to produce fibers with the given structure of shells, cores and control electrodes at simplification of process of a drawing down of fibers.

EFFECT: the invention ensures creation of a single-mode fiber with heightened electrooptical effect, to produce fibers with the given structure of shells, cores and control electrodes, to simplify process of fibers drawing down.

13 cl, 9 dwg

FIELD: fiber-optics.

SUBSTANCE: fiber has core and cover. Fiber is made in such a way, that in case of change of radiuses of beds with different refraction coefficients, at least one optical property of core, for example, effective section of core Aeff and slant of dispersion curve, reach appropriate limit values in given range of deflections from base radius. Length of cut wave equals 1450 nm or less. Optical fibers have practically constant optical properties and allow to vary chromatic dispersion in certain limits.

EFFECT: higher efficiency.

2 cl, 14 dwg

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