Claims
- 1. An optical fiber which has, at a wavelength of 1 550 nm, a chromatic dispersion from −12 ps/(nm.km) to −4 ps/(nm.km) and a ratio of chromatic dispersion to chromatic dispersion slope from 250 nm to 370 nm.
- 2. The fiber claimed in claim 1, which has, at a wavelength of 1 550 nm, an effective surface area greater than 20 μm2, and preferably greater than or equal to 30 μm2.
- 3. The fiber claimed in claim 1, which has, at wavelengths from 1 300 nm to 1 620 nm, and preferably at wavelengths from 1 300 nm to 1 650 nm, bending losses less than or equal to 0.05 dB, and preferably less than or equal to 0.001 dB, after winding 100 turns around a 30 mm radius former.
- 4. The fiber claimed in claim 1, which has, at wavelengths from 1 300 nm to 1 620 nm, and preferably at wavelengths from 1 300 nm to 1 650 nm, bending losses less than or equal to 100 dB/m, for a bending radius of 10 mm.
- 5. The fiber claimed in claim 1, which has, at wavelengths from 1 300 nm to 1 620 nm, and preferably at wavelengths from 1 300 nm to 1 650 nm, a sensitivity to microbending less than or equal to 1, and preferably less than or equal to 0.5.
- 6. The fiber claimed in claim 1, which has, at wavelengths from 1 300 nm to 1 620 nm, and preferably at wavelengths from 1 300 nm to 1 650 nm, an attenuation less than or equal to 0.30 dB/km and preferably less than or equal to 0.25 dB/km.
- 7. The fiber claimed in claim 1, which has an in-cable cut-off wavelength less than or equal to 1 400 nm, and preferably less than or equal to 1 300 nm.
- 8. The fiber claimed in claim 1, which has a polarization mode dispersion less than or equal to 0.1 ps.km−½.
- 9. The fiber claimed in claim 1, which has an index profile comprising a rectangle or a trapezium with a buried trench and a ring.
- 10. The fiber claimed in claim 9, in which the difference relative to the index of the cladding of the index of the trapezium or rectangle central part of said fiber is from 9.5×10−3 to 11.6×10−3 and in which the radius of the central part of said fiber whose index is higher than the index of said cladding is from 2.4 μm to 2.9 μm.
- 11. The fiber claimed in claim 9, in which the difference relative to the index of the cladding of the index of said buried trench is from −6.9×10−3 to −3.1×10−3 and in which the outside radius of said buried trench is from 4.8 μm to 6.9 μm.
- 12. The fiber claimed in claim 9, in which the difference relative to the index of the cladding of the index of said ring is from 1.5×10−3 to 8.4×10−3 and in which the outside radius of said ring is from 7.5 μm to 10.2 μm.
- 13. The fiber claimed in claim 9, which has a trapezium central part and in which the ratio of the radius of the smaller base of said trapezium to the radius of the larger base of said trapezium is from 0.8 to 1.
- 14. The fiber claimed in claim 1, which has an index profile comprising a trapezium with a buried trench and a ring and in which the ratio of the radius of the smaller base of said trapezium to the radius of the larger base of said trapezium is from 0.6 to 0.8.
- 15. The fiber claimed in claim 14, in which the difference relative to the index of the cladding of the index of the trapezium central part of said fiber is from 9.8×10−3 to 11.6×10−3 and in which the radius of the central part of said fiber whose index is higher than the index of said cladding is from 2.5 μm to 2.9 μm.
- 16. The fiber claimed in claim 14, in which the difference relative to the index of the cladding of the index of said buried trench is from −7.0×10−3 to −3.2×10−3 and in which the outside radius of said buried trench is from 4.7 μm to 7.0 μm.
- 17. The fiber claimed in claim 14, in which the difference relative to the index of the cladding of the index of said ring is from 1.5×10−3 to 8.5×10−3 and in which the outside radius of said ring is from 7.5 μm to 10.2 μm.
- 18. Use of a fiber as claimed in claim 1 as dispersion compensating fiber in a wavelength division multiplex optical fiber transmission system.
- 19. Use as claimed in claim 1, in which said compensating fiber is incorporated into a cable and used as line fiber.
- 20. A wavelength division multiplex optical fiber transmission system including a first section of line fiber and a second section of line fiber as claimed in claim 1.
- 21. The transmission system claimed in claim 1, in which said line fiber of said first section has a chromatic dispersion from 5 ps/(nm.km) to 11 ps/(nm.km) at a wavelength of 1 550 nm.
- 22. The transmission system claimed in claim 20, in which said line fiber of said first section has a chromatic dispersion slope from 0.01 ps/(nm2.km) to 0.04 ps/(nm2.km) at a wavelength of 1 550 nm.
- 23. The transmission system claimed in claim 20, in which said line fiber of said first section has an effective surface area from 50 μm2 to 70 μm2 at a wavelength of 1 550 nm.
- 24. The transmission system claimed in claim 20, in which said line fiber of said first section has a ratio of chromatic dispersion to chromatic dispersion slope from 250 nm to 370 nm at a wavelength of 1 550 nm.
- 25. The transmission system claimed in claim 20, in which the ratio of the length of said first section to the length of said second section is substantially the inverse of the absolute value of the ratio of the chromatic dispersions at a wavelength of 1 550 nm of said fibers of said first and second sections.
- 26. The transmission system claimed in claim 20, in which the cumulative chromatic dispersion at a wavelength from 1 450 nm to 1 620 nm, and preferably at a wavelength from 1 450 nm to 1 650 nm, is less than 100 ps/nm, and preferably less than 50 ps/nm, on average over 100 km of transmission.
Priority Claims (1)
Number |
Date |
Country |
Kind |
00 13 724 |
Oct 2000 |
FR |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is based on French Patent Application No. 00 13 724 filed Oct. 26, 2000, the disclosure of which is hereby incorporated by reference thereto in its entirety, and the priority of which is hereby claimed under 35 U.S.C. §119.