초록 ▼

Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region having a radius greater than 30 microns and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular

Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region having a radius greater than 30 microns and a cladding region surrounding and directly adjacent to the core region, the cladding region comprising a depressed-index annular portion comprising a depressed relative refractive index. The fiber has a total outer diameter of less than 120 microns, and exhibits an overfilled bandwidth at 850 nm greater than 500 MHz-km.

대표청구항 ▼

1. A multimode optical fiber comprising: a graded index core comprising a core refractive index delta percent Δ1, said core comprising a core radius greater than 30 microns; anda depressed index cladding region surrounding said core and comprising refractive index delta percent Δ3, wherein Δ3 is les

1. A multimode optical fiber comprising: a graded index core comprising a core refractive index delta percent Δ1, said core comprising a core radius greater than 30 microns; anda depressed index cladding region surrounding said core and comprising refractive index delta percent Δ3, wherein Δ3 is less than about −0.1% and said depressed region has a width of at least 1 micron, wherein Δ1>Δ3, and said fiber comprises a total outer diameter of less than 120 microns. 2. The multimode fiber of claim 1, wherein said fiber is comprised of glass, and further comprising an outer cladding region comprising refractive index delta Δ4 said outer cladding region surrounding said depressed index cladding region. 3. The multimode fiber of claim 1, wherein said depressed index cladding region is directly adjacent the core and has a refractive index delta less than about −0.2% and a width of at least 2 microns. 4. The multimode fiber of claim 1, further comprising an inner cladding region comprising Δ2, wherein said inner cladding region surrounds said core and said depressed cladding region surrounds said inner cladding region, wherein Δ1>Δ2>Δ3, and said inner cladding region is less than 4 microns wide. 5. The multimode fiber of claim 1, wherein said core comprises a core radius greater than 35 microns. 6. The multimode fiber of claim 5, wherein said fiber is comprised of glass, said core comprises a glass core radius less than 45 microns, and said total outer glass diameter is less than 110 microns. 7. The multimode fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at 850 nm which is greater than 500 MHz-km. 8. The fiber of claim 1, wherein said fiber further exhibits a 1 turn 15 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.5 dB/turn at 850 nm. 9. The fiber of claim 1, wherein said fiber further exhibits a 1 turn 15 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.25 dB/turn at 850 nm. 10. The fiber of claim 1, wherein said fiber further exhibits a 1 turn 15 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.1 dB/turn at 850 nm. 11. The fiber of claim 1, wherein said depressed-index annular portion has a width less than 10 microns. 12. The multimode fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at 1300 nm which is greater than 200 MHz-km. 13. The multimode fiber of claim 1, wherein said fiber exhibits a numerical aperture greater than 0.2. 14. The multimode fiber of claim 1, wherein said fiber exhibits a numerical aperture greater than 0.24. 15. The multimode fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at 1300 nm which is greater than 500 MHz-km. 16. The multimode fiber of claim 1, wherein delta 2 is less than −0.3%. 17. The fiber of claim 2 wherein the maximum refractive index delta of the graded index glass core is greater than 0.8% and less than 2.2%. 18. A multimode optical fiber comprising: a graded index core having a radius greater than 35 microns; and a first inner cladding comprising a depressed-index annular portion, said depressed-index annular portion having a refractive index delta less than about −0.2% and a width of at least 1 micron, and said fiber further exhibits a 1 turn 15 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.25 dB/turn at 850 nm. 19. The multimode fiber of claim 18 further comprising a numerical aperture of greater than 0.185. 20. The multimode fiber of claim 18, wherein said fiber is comprised of glass, and wherein the outer glass diameter of said fiber is less than 120 microns. 21. The multimode fiber of claim 18, wherein said fiber further exhibits an overfilled bandwidth greater than 500 MHz-km at 850 nm. 22. The multimode fiber of claim 17 further comprising a numerical aperture of greater than 0.24. 23. The multimode fiber of claim 17 further comprising a numerical aperture of greater than 0.28. 24. The multimode fiber of claim 17 further comprising a 1×180° turn 3 mm diameter mandrel wrap attenuation increase at a wavelength of 850 nm, of less than 0.5 dB for an encircled flux launch. 25. The multimode fiber of claim 17 further comprising a 2×90° turn 4 mm diameter mandrel wrap attenuation increase at a wavelength of 850 nm, of less than 0.2 dB for an encircled flux launch. 26. The multimode fiber of claim 1, further comprising a coating of carbon on the outer surface of said fiber, said coating having a thickness no greater than about 100° A, and wherein the multimode fiber has a dynamic fatigue constant greater than 50, and at least one polymer coating surrounding and in contact with said carbon coating. 27. The multimode fiber of claim 25, wherein said fiber exhibits a 15% Weibull failure probability greater than 400 kpsi. 28. The multimode fiber of claim 25, further comprising a dynamic fatigue constant greater than 100. 29. The multimode fiber of claim 20, further comprising an NA*CD greater than 20. 30. The multimode fiber of claim 1, further comprising an NA*CD greater than 20. 31. The multimode fiber of claim 1, further comprising a coating thereon having a Shore D hardness of greater than 50, said coating having an outer diameter between 120 and 130 microns.