Claims
- 1. An optical fiber, comprising:
a refractive index profile having
a first moat with a negative delta (Δ2), a second moat with a negative delta (Δ4), and
the refractive index profile is selected to provide a negative total dispersion at 1550 nm, a kappa value, defined as total dispersion divided by dispersion slope at 1550 nm, of less than 75 nm.
- 2. The fiber of claim 1 further comprising
a central core having a positive delta (Δ1), and a ring surrounding the first moat having a positive delta (Δ3).
- 3. The fiber of claim 1 wherein the total dispersion at 1550 nm is more negative than about −40 ps/nm/km.
- 4. The fiber of claim 1 wherein the total dispersion at 1550 nm is more negative than −40 and less negative than −400 ps/nm/km.
- 5. The fiber of claim 1 wherein the total dispersion at 1550 nm is more negative than about −140 ps/nm/km.
- 6. The fiber of claim 1 wherein the dispersion slope at 1550 nm is less than −0.75 and greater than −8.50 ps/nm2/km.
- 7. The fiber of claim 1 wherein kappa at 1550 nm is between about 40 and 75 nm.
- 8. The fiber of claim 1 including a pin array bend loss at 1550 nm of less than 9 dB.
- 9. The fiber of claim 1 wherein a central core has a delta (Δ1) of less than 2.0%.
- 10. The fiber of claim 9 wherein an outer core radius (R1) of the central core is between about 1.2 and 3.1 microns.
- 11. The fiber of claim 9 wherein the central core has an alpha (a) of less than about 6.
- 12. The fiber of claim 1 wherein delta (Δ2) of the first moat is less than −0.2%.
- 13. The fiber of claim 12 wherein an outer radius (R2) of the first moat is located between about 4.5 and 10.6 microns.
- 14. The fiber of claim 1 wherein delta (Δ4) of the second moat is less than −0.05%.
- 15. The fiber of claim 14 wherein an outer radius (R5) of the second moat is between about 19.5 and 37.5 microns.
- 16. An optical transmission line, wherein the fiber as set forth in claim 1 is a dispersion compensating fiber optically coupled to a transmission fiber, the transmission fiber having:
a total dispersion between 2 and 6 ps/nm/km at 1550 nm, and a positive dispersion slope of less than 0.092 ps/nm2/km at 1550 nm.
- 17. The line of claim 16 wherein the transmission fiber comprises a kappa value, defined as total dispersion at 1550 nm divided by dispersion slope at 1550 nm, of between 40 and 75 nm.
- 18. The line of claim 16 wherein a High-to-Low residual dispersion for the transmission line over an entire C band having a wavelength range from 1525 nm to 1565 nm is less than 50 ps/nm for a 100 km length of transmission fiber.
- 19. The line of claim 16 wherein the dispersion compensating fiber is optically coupled to a trim fiber which has:
a total dispersion between 14 and 21 ps/nm/km at 1550 nm, and a positive dispersion slope of between 0.04 and 0.07 ps/nm2/km at 1550 nm.
- 20. A dispersion compensation fiber, comprising:
a refractive index profile including
a central core having a positive core delta (Δ1) less than 2.0% and an outer radius (R1) between 1.2 and 3.1 microns, a first moat having a moat delta (Δ2) more negative than −0.2% and an outer radius (R2) of between 4.5 and 10.6 microns, a ring having a positive ring delta (Δ3) greater than 0.2% and a center radius (R3) of between 6.5 and 12.0 microns, and a second moat having a delta (Δ4) less than −0.05% and an outer radius (R5) between 19.5 and 37.5 microns;
the refractive index profile selected to provide a total dispersion less than −40 and greater than −400 ps/nm/km at 1550 nm; a dispersion slope of between −0.75 and −8.5 ps/nm2/km at 1550 nm; and kappa, defined as total dispersion at 1550 nm divided by dispersion slope at 1550 nm, of greater than 40 and less than 75 nm.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of priority under 35 U.S.C. §119(e) of U.S. Provisional Application Serial No. 60/419,187 filed on Oct. 17, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
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60419187 |
Oct 2002 |
US |