Optical fiber for extended spectral band

 

The invention is used in fiber-optic communication lines with the multiplexing channel wavelengths having different carrier wavelengths in the extended wavelength range between 1530 and 1650 nm. The fiber includes a glass core comprising an inner core having a first difference of the refractive index, the first layer radially surrounding the inner core along the length of the fiber and having a second difference of refractive index less than zero, the second layer radially surrounding the first layer along the length of the fiber and having a third difference of the refractive index, the third layer radially surrounding the second layer along the length of the fiber and having a fourth difference of the refractive index, the greater of zero and the glass sheath surrounding the glass core and having a difference of refractive index is essentially equal to zero. The second layer has a width of 1-5 μm, the third difference of the refractive index in absolute value less than 40% of said second differential refractive index. Reduced optical loss. 2 C. and 22 C. p. F.-ly, 2 tab., 14 Il.

Description text in facsimile form (see graphic part)I

Formula of the picture is the financing channels by wavelength, having carrier wavelengths in the wavelength range 1530-1650 nm, the fiber containing glass core comprising an inner core (22, 72) having a first difference between the refractive indices of the first layer (24, 74), radially surrounding the inner core along the length of the fiber and having a second difference between the refractive indices less than zero, the second layer (26, 76), radially surrounding the first layer along the length of the fiber and having a third difference between the refractive indices, the third layer (23, 28, 78), radially surrounding the second layer along the length of the fiber and having a fourth difference between the refractive indices greater of zero and the glass shell (30, 80) surrounding the glass core and having a difference in index of refraction equal to zero, characterized in that the said second layer has a width in the range of 1-5 μm, and the third difference between the refractive indices in absolute value less than 40% of said second refractive index difference between.

2. Fiber under item 1, characterized in that the said third difference of the refractive index in absolute value less than 20% of said second differential refractive index.

3. Fiber under item 2, characterized in that the said third difference Loy has a width in the range of 2-4 microns.

5. Fiber one from PP.1-4, characterized in that it further comprises a fourth layer (29, 79), radially surrounding the third layer along the length of the fiber and having a fifth difference of refractive index less than zero.

6. Fiber one from PP.1-5, characterized in that the first difference of the refractive index of the inner core (22, 72) exceeds a fourth difference between the refractive indices of the third layer (28, 78).

7. Fiber one from PP.1-5, characterized in that the fourth difference of the refractive index of the third layer (23, 78) is greater than the first difference of the refractive index of the inner core (22, 72).

8. Fiber one from PP.1-7, characterized in that the fiber has a wavelength zero dispersion is less than about 1500 nm.

9. Fiber under item 8, characterized in that the fiber has a wavelength zero dispersion less than 1480 nm.

10. The fiber according to any one of paragraphs.1-9, characterized in that the fiber has a dispersion slope less than or equal to 0,043 PS/(nm2·km) at a wavelength of 1550 nm.

11. Fiber one from PP.1-8, characterized in that the wavelength range is between 1450 nm and 1650 nm.

12. Fiber on p. 11, characterized in that the fiber has a dispersion slope less of 0.07 PS/(nm2·km) extended/(nm2·km) at the wavelength range.

14. Fiber one from PP.1-13, characterized in that the fiber has a dispersion value at least 1.5 times the PS/(nm2·km) at the wavelength range.

15. Fiber under item 14, characterized in that the variance is in the range of 1.5-12 PS/(nm2·km) at the wavelength range.

16. Fiber one from PP.1-15, characterized in that the fiber has a dispersion slope less than or equal 0,046 PS/(nm2·km) at a wavelength of 1550 nm.

17. Fiber one from PP.1-16, characterized in that the fiber has a wavelength zero dispersion less than 1450 nm.

18. Fiber one from PP.1-17, characterized in that the fiber has an effective area greater than 50 μm2.

19. Fiber under item 18, characterized in that the fiber has an effective area of approximately 55 μm2.

20. A method of manufacturing a single-mode optical fiber for use in a transmission system with multiplexing channel wavelengths having different carrier wavelengths in the wavelength range including the fabrication preform having a region (22, 72) of the inner core with the first difference of the refractive indexes of the first layer (24, 74), radially surrounding area of the inner core along the length of the workpiece and Imlay along the length of the workpiece and having a third difference between the refractive indices, the third layer (23, 28, 78), radially surrounding the second layer along the length of the workpiece and having a fourth difference between the refractive indices, the big zero, layer (30, 80) glass shell surrounding the core area and having a difference in index of refraction essentially equal to zero, the pulling of the said workpiece, characterized in that the stage of manufacture of the workpiece includes the choice referred to the third refractive index difference between the absolute value, less than 40% of said second refractive index difference between the choice of the width of the aforementioned second layer in the workpiece so to the corresponding layer in the outer fiber had a width in the range of 1-5 microns.

21. The method according to p. 20, characterized in that the said third difference between the refractive indices selected in absolute value, less 20% of said second refractive index difference between.

22. The method according to one of paragraphs.20-21, characterized in that the stage of manufacture of the workpiece includes the selection of the width of the aforementioned second layer in the workpiece so that the corresponding layer in the outer fiber had a width in the range of 2-4 microns.

23. The method according to one PP.20-22, characterized in that it includes the selection of the width of said region of the inner heart is sesta indices of refraction so, to the dispersion slope of the stretched fiber was less than or equal to 0,046 PS/(nm2·km) at a wavelength of 1550 nm.

24. The method according to p. 23, characterized in that it includes the selection of the width of said inner core and said first, second and third layers and the choice of the aforementioned first, second, third and fourth differences of the refractive indices so that the slope of the dispersion extruded fiber was less than or equal to 0,043 PS/(nm2·km) at a wavelength of 1550 nm.

 

Same patents:

The invention relates to optical fiber with low dispersion used, for example, when performing optical transmission using wavelength division multiplexing in the range of 1.5 μm and an optical transmission system using such an optical fiber with low dispersion

The invention relates to optical fiber having improved characteristics vodorodostojkih

The invention relates to optical fiber dispersion-shifted, which has a large effective core area and low dispersion slope

The invention relates to optoelectronics and used in fiber-optic communication lines

The invention relates to a single-mode optical waveguide fiber designed for use in communication systems long-haul high-speed transmission, operating in the wavelength range from approximately 1500 to 1600 nm

The invention relates to a single-mode optical waveguide fiber, which has a wavelength zero dispersion shifted in the range of about 1550 nm, a large effective area and low slope full dispersion

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

Up!