Claims
- 1. A dispersion compensating optical fiber comprising:a refractive index profile selected to result in a dispersion at 1550 nm which is less than −30 ps/mn/km; a kappa value obtained by dividing the dispersion at 1550 nm by a dispersion slope at 1550 nm of between 40 and 60; and a central segment within the refractive index profile having a Δ1 and an outer radius r1, a second annular segment within the profile which surrounds the central segment having a Δ2 and an outer radius r2, a third annular segment in the profile which surrounds the second segment having a Δ3, and a cladding layer comprising Δc, wherein Δ1>Δ3>Δc>Δ2.
- 2. The dispersion compensating optical fiber of claim 1 wherein a core moat ratio r1/r2 is less than 0.36.
- 3. The dispersion slope compensating optical fiber of claim 2 wherein the core moat ratio is less than 0.34.
- 4. The dispersion compensating optical fiber of claim 1 wherein a dispersion slope of the fiber is less than −0.8 ps/nm2/km over the wavelength range 1525 to 1565 nm.
- 5. The dispersion compensating optical fiber of claim 4 wherein the dispersion slope is less than −1.5 ps/nm2/km over a wavelength range 1525 to 1565 nm.
- 6. The dispersion compensating optical fiber of claim 1 wherein dispersion slope is between about −1.5 and −3.0 ps/nm2/km over the wavelength range 1530 to 1560 nm.
- 7. The dispersion compensating optical fiber of claim 6 wherein dispersion slope is between about −1.8 and −2.5 ps/nm2/km over the wavelength range 1530 to 1560 nm.
- 8. The dispersion compensating optical fiber of claim 1 wherein the dispersion at 1550 nm is less than −50 ps/nm/km.
- 9. The dispersion compensating optical fiber of claim 1 wherein the dispersion at 1550 nm is less than −75 ps/nmn/km.
- 10. The dispersion compensating optical fiber of claim 1 wherein the dispersion at 1550 nm is less than −100 ps/nm/km.
- 11. The dispersion compensating optical fiber of claim 1 wherein a dispersion slope is less than −1.5 ps/nm2/km at 1550 nm and the dispersion is less than −70 ps/nm/km at 1550 nm.
- 12. The dispersion slope compensating optical fiber of claim 1, whereinΔ1 is between 1.0 and 2.5 percent and comprises an outer radius r1 between about 1 to 3 microns, Δ2 is less than about −0.4 percent, and comprises an outer radius r2 between about 3.5 and 8 microns, and Δ3 is between about 0.2 to 1.0 percent and comprises a center radius r3 between about 5 to 12 microns.
- 13. The dispersion slope compensating optical fiber of claim 1 wherein Δ1 is between 1.0 and 2.5 percent and comprises an outer radius r1 between about 1 to 3 microns, Δ2 is less than about −0.4 percent, and comprises an outer radius r2 between about 3.5 and 8 microns, and Δ3 is between about 0.2 to 1.0 percent and comprises a center radius r3 between about 5 to 12 microns.
- 14. The dispersion compensating optical fiber of claim 1 further comprising:a dispersion at 1550 nm which is greater than −200; and the central segment has an outer radius r1 and the second annular segment has an outer radius r2 and the core moat ratio taken as r1 divided by r2 is less than 0.4.
- 15. The dispersion compensating optical fiber of claim 1 further comprisingΔ1 between about 1.6 percent to 2.0 percent, and Δ2 less than −0.6.
- 16. The dispersion compensating optical fiber of claim 1 wherein Δ1 is between 1.6 and 2.0 percent and comprises an outer radius r1 between about 1.5 to 2.0 microns, Δ2 is less than about −0.6 percent, and comprises an outer radius r2 between about 4.5 and 6 microns, and Δ3 is between about 0.4 to 0.8 percent and comprises a center radius r3 between about 6 to 10 microns.
- 17. The dispersion slope compensating optical fiber of claim 16 wherein r3 is spaced from r2 by greater than 1.0 microns.
- 18. A dispersion compensating module comprising at least one fiber made in accordance with claim 1.
- 19. A dispersion compensating optical fiber, comprising:a refractive index profile selected to result in a dispersion at 1550 nm which is less than −75 ps/nm/km; a dispersion slope which is less than −1.5 ps/nm 2/km over a wavelength range from 1525 to 1565 nm; a kappa value, obtained by dividing the dispersion at 1550 nm by a dispersion slope at 1550 nm, of between 40 and 60; and a central segment within the refractive index profile having a Δ1 and an outer radius r1, a second annular segment within the profile which surrounds the central segment having a Δ2 and an outer radius r2, a third annular segment in the profile which surrounds the second segment having a Δ3, and a cladding layer having a Δc, wherein Δ1>Δ3>Δc>Δ2.
- 20. The dispersion compensating optical fiber of claim 19 wherein a core moat ratio, defined as r1/r2, is less than 0.36.
- 21. The dispersion slope compensating optical fiber of claim 20 wherein the core moat ratio is less than 0.34.
- 22. The dispersion compensating optical fiber of claim 19 wherein the dispersion at 1550 nm is less than −100 ps/nm/km.
- 23. The dispersion compensating optical fiber of claim 22 wherein dispersion slope is between about −1.5 and −3.0 ps/nm2/km over the wavelength range 1530 to 1560 nm.
- 24. The dispersion slope compensating optical fiber of claim 19, whereinΔ1 is between 1.0 and 2.5 percent and comprises an outer radius r1 between about 1 to 3 microns; Δ2 is less than about −0.4 percent, and comprises an outer radius r2 between about 3.5 and 8 microns; and Δ3 is between about 0.2 to 1.0 percent and comprises a center radius r3 between about 5 to 12 microns.
- 25. The dispersion compensating optical fiber of claim 19, further comprising:□1 between about 1.6 and 2.0 percent, and □2 less than −0.6 percent.
- 26. The dispersion compensating optical fiber of claim 19, further comprising:Δ1 is between 1.6 and 2.0 percent, and an outer radius r1 is between about 1.5 to 2.0 microns, Δ2 is less than about −0.6 percent, and an outer radius r2 is between about 4.5 and 6 microns, and Δ3 is between about 0.4 to 0.8 percent, and a center radius r3 is between about 6 to 10 microns.
RELATED APPLICATIONS
This application claims priority to, and the benefit of, U.S. Prov. applications No. 60/192,056 filed Mar. 24, 2000 and No. 60/196,437 filed Apr. 12, 2000, and is a continuation of U.S. application Ser. No. 09/802,696 filed Mar. 9, 2001, the disclosures of which are hereby incorporated by reference herein.
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Provisional Applications (2)
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Number |
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60/192056 |
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Continuations (1)
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Number |
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Parent |
09/802696 |
Mar 2001 |
US |
Child |
10/122250 |
|
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