Claims
- 1. An optical fiber comprising:
a central core region disposed about a centerline and extending to a radius R1, the central core region having a local minimum relative refractive index percent Δ1, LM located at a radius R1, LM on or near the centerline and a maximum relative refractive index percent Δ1, MAX located at a radius R1, MAX, wherein R1, MAX>R1, LM; and a clad layer surrounding the central core region; wherein the ratio Δ1, LM/Δ1, MAX is greater than 0.65 and less than 1.0; and wherein the optical fiber exhibits an effective area not less than 115 μm2 at a wavelength of 1550 nm and an increase in attenuation induced by one turn of said optical fiber about a 32 mm diameter mandrel less than about 0.5 dB at a wavelength of 1550 nm.
- 2. The optical fiber of claim 1 wherein the attenuation at a wavelength of 1550 nm is less than about 0.21 dB/km.
- 3. The optical fiber of claim 1 wherein the optical fiber exhibits lateral load bend loss at 1550 nm not greater than 1.5 dB/m.
- 4. The optical fiber of claim 1 wherein the ratio Δ1, LM/Δ1, MAX is between 0.6 and 0.9.
- 5. The optical fiber of claim 1 wherein the change in relative refractive index percent with respect to radius between R1, LM and R1, MAX is less than about 0.03%-μm−1.
- 6. The optical fiber of claim 1 wherein the ratio R1, LM/R1, MAX is less than about 0.2.
- 7. The optical fiber of claim 1 wherein the ratio R1, MAX/R1 is greater than about 0.25.
- 8. The optical fiber of claim 1 wherein R1 is between about 6 μm and about 10 μm.
- 9. The optical fiber of claim 1 wherein Δ1, MAX is less than about 0.4%.
- 10. The optical fiber of claim 1 wherein the relative refractive index percent rises monotonically from Δ1, LM to Δ1, MAX.
- 11. The optical fiber of claim 1 wherein relative refractive index of the central core region is at all points greater than 0%.
- 12. The optical fiber of claim 1 further comprising an annular region disposed between the central core region and the clad layer, wherein relative refractive index percent of the annular region less than 0% and has a minimum relative refractive index percent A2, MIN, and wherein the annular region extends to a radius R2.
- 13. The optical fiber of claim 12 wherein Δ2, MIN is between about −0.05% and about −0.30%.
- 14. The optical fiber of claim 1 wherein the optical fiber exhibits an effective area not less than 130 μm2 at a wavelength of 1550 nm.
- 15. The optical fiber of claim 1 wherein the optical fiber exhibits an effective area not less than 150 μm2 at a wavelength of 1550 nm.
- 16. The optical fiber of claim 1 wherein the optical fiber exhibits an effective area not less than 170 μm2 at a wavelength of 1550 nm.
- 17. The optical fiber of claim 1 wherein the attenuation at a wavelength of 1550 nm is less than about 0.19 dB/km.
- 18. The optical fiber of claim 1 wherein the attenuation at a wavelength of 1610 nm is less than about 0.20 dB/km.
- 19. The optical fiber of claim 1 wherein the attenuation at a wavelength of 1380 nm is less than about 0.3 dB/km above the attenuation at a wavelength of 1310 nm.
- 20. The optical fiber of claim 1 wherein the attenuation induced by one turn of said optical fiber about a 32 mm diameter mandrel is less than about 1.0 dB at a wavelength of 1610 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. 60/332,391 filed on Nov. 15, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60332391 |
Nov 2001 |
US |