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1. WO2008027336 - LOW BEND LOSS OPTICAL FIBER WITH DEEP DEPRESSED RING

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What is claimed is:

1. An optical fiber comprising:
a glass core extending from a centerline to a radius Ri;
a glass cladding surrounding and in contact with the core, the cladding comprising:
an annular inner region extending from Rj to a radius R2, the inner region comprising a radial width, W2 = R2 - Ri,
an annular ring region extending from R2 to a radius R3, the ring region
comprising a radial width, W3 = R3 - R2, and
an annular outer region extending from R3 to an outermost glass radius R4;
wherein the core comprises a maximum relative refractive index, ΔIMAX, relative to the outer region, and ΔIMAX < 0.45%;
wherein the annular inner region comprises a radial width, W2, a minimum relative refractive index, Δ2MIN, relative to the outer region, and a maximum relative refractive index, Δ2MAX, relative to the outer region, wherein Δ2MIN > -0.05%, Δ2MAX < 0.05%, and W2 > 2A Ri; wherein the annular ring region comprises:
a minimum relative refractive index, Δ3MIN, relative to the annular outer
region, wherein Δ3MIN < -0.63 %;
wherein ΔiMAχ > Δ2MAX > Δ3MIN, and ΔMAχ > Δ2MIN > Δ3MIN; and
wherein the core and the cladding provide a fiber cutoff less than 1260 nm, a zero dispersion between 1300 and 1324 nm, a mode field diameter at 1310 nm of between 8.20 and 9.50 μm, and a 10 mm diameter mandrel bend loss of less than 1.0 dB/turn.

2. The optical fiber of claim 1 wherein the core and the cladding provide a 20 mm diameter mandrel bend loss of less than 0.05 dB/turn.

3. The optical fiber of claim 1 wherein the core and the cladding provide a pin array bend loss at 1550 nm of less than 10 dB.

4. The optical fiber of claim 1 wherein the annular ring region comprises a profile volume, V3, equal to:
R3
2 I Δ(r) dr ;
R2
wherein |V3| > 20 %-μm2.

5. The optical fiber of claim 1 wherein 0.2 < R1/R2 < 0.6.

6. An optical fiber comprising:
a glass core extending from a centerline to a radius Ri;
a glass cladding surrounding and in contact with the core, the cladding comprising:
an annular inner region extending from Ri to a radius R2, the inner region comprising a radial width, W2 = R2 - R1,
an annular ring region extending from R2 to a radius R3, the ring region
comprising a radial width, W3 = R3 - R2, and
an annular outer region extending from R3 to an outermost glass radius R4;
wherein the core comprises a maximum relative refractive index, A1MAX, relative to the outer region, and A1 MAX < 0.45%;
wherein the annular inner region comprises a radial width, W2, a minimum relative refractive index, Δ2MIN, relative to the outer region, and a maximum relative refractive index, Δ2MAX, relative to the outer region, wherein Δ2MIN > -0.05%, Δ2MAX < 0.05%, and W2 > 2A Ri; wherein the annular ring region comprises:
a minimum relative refractive index, Δ3MEN, relative to the annular outer
region, wherein Δ3MIN < -0.63 %, and
a profile volume, V3, equal to:
R3
2 J Δ(r) dr ;
R2
wherein |V3| > 20 %-μm2;
wherein ΔIMAX > Δ2MAX > Δ3MIN, and ΔMAχ > Δ2MIN > Δ3MIN; and wherein 0.2 < Ri/R2 < 0.6.

7. The optical fiber of claim 6 wherein 0.4 < R1ZR2 < 0.6.

8. The optical fiber of claim 6 wherein 20 %-μm2< |V3| < 80 %-μm2.

9. The optical fiber of claim 6 wherein 0.28% < ΔIMAX < 0.45%.

10. The optical fiber of claim 6 wherein Ri < 5.0 μm.

11. The optical fiber of claim 6 wherein R2 > 8 μm.

12. The optical fiber of claim 6 wherein R3 > 10 μm.

13. The optical fiber of claim 6 wherein W3 is between 2 and 5 μm.

14. The optical fiber of claim 1 wherein the core comprises a profile volume, Vi, equal to:
R.
2 I Δ(r) dr ;
0
wherein Vi is greater than 0 and less than 6.2 %-μm2.

15. The optical fiber of claim 6 wherein the core and the cladding provide a fiber cutoff less than 1260 nm.

16. The optical fiber of claim 6 wherein the core and the cladding provide a zero dispersion between 1300 and 1324 nm.

17. The optical fiber of claim 6 wherein the core and the cladding provide a mode field diameter at 1310 nm of between 8.20 and 9.50 μm.

18. The optical fiber of claim 6 wherein the core and the cladding provide a 10 mm diameter mandrel bend loss of less than 1.0 dB/turn.

19. The optical fiber of claim 6 wherein the core and the cladding provide a 20 mm diameter mandrel bend loss of less than 0.05 dB/turn.

20. The optical fiber of claim 6 wherein the core and the cladding provide a pin array bend loss at 1550 nm of less than 10 dB.