Bend resistant multimode optical fiber
First Claim
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1. A multimode optical fiber comprising:
- a glass core having a parabolic graded index; and
an inner cladding surrounding and in contact with the core, the inner cladding having a refractive index which departs from the parabolic index of the core, the core having an outer radius between 20 and 40 micron and an alpha between 1.9 and 2.3, and a second cladding comprising a depressed-index annular portion surrounding the inner cladding, said depressed-index annular portion having a refractive index delta less than about −
0.3% and a width of at least 1 micron, wherein the width of said inner cladding is at least 0.5 microns and less than 4 microns, and said fiber exhibits an OFL bandwidth of greater than 3.0 GHz-km, and a 1 turn 20 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.1 dB/turn at 850 nm.
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Abstract
Bend resistant multimode optical fibers are disclosed herein. Multimode optical fibers disclosed herein comprise a core region 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 which is spaced from the core at least 0.5 microns and less than 4 microns.
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Citations
28 Claims
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1. A multimode optical fiber comprising:
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a glass core having a parabolic graded index; and an inner cladding surrounding and in contact with the core, the inner cladding having a refractive index which departs from the parabolic index of the core, the core having an outer radius between 20 and 40 micron and an alpha between 1.9 and 2.3, and a second cladding comprising a depressed-index annular portion surrounding the inner cladding, said depressed-index annular portion having a refractive index delta less than about −
0.3% and a width of at least 1 micron, wherein the width of said inner cladding is at least 0.5 microns and less than 4 microns, and said fiber exhibits an OFL bandwidth of greater than 3.0 GHz-km, and a 1 turn 20 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.1 dB/turn at 850 nm.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 19)
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15. A multimode optical fiber comprising:
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a glass core having a parabolic graded index; and an inner cladding surrounding and in contact with the core, the inner cladding having a refractive index which departs from the parabolic index of the core, and a second cladding comprising a depressed-index annular portion surrounding the inner cladding, said depressed-index annular portion having a refractive index delta less than about −
0.3% and a width of at least 1 micron, wherein the width of said inner cladding is at least 0.5 microns and said fiber further exhibits a 1 turn 10 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.4 dB/turn at 850 nm, and an overfilled bandwidth greater than 1.5 GHz-km at 850 nm and said fiber exhibits an OFL bandwidth of greater than 3.0 GHz-km.- View Dependent Claims (16, 17, 18)
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20. A multimode fiber comprising a core having a parabolic graded index, and a cladding surrounding said core, said cladding comprising an inner annular region, the annular region having a refractive index which departs from the parabolic index of the core, and a depressed annular region surrounding the inner annular region, wherein the core has an outer radius R1 between 23 and 26 microns and said inner annular region comprises a width of greater than 0.5 microns and less than 3 microns, said inner annular region comprising a peak fluorine concentration greater than −
- 0.3 wt percent and a peak germania concentration greater than 0.2 wt percent, said depressed annular region comprising a depressed-index having a refractive index delta less than about −
0.2% and a width of at least 1 micron, and said fiber exhibits an OFL bandwith of greater than 2.0 GHz-km, and a 1 turn 20 mm diameter wrap attenuation increase of less than or equal to 0.1 dB/turn at 850 nm. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
- 0.3 wt percent and a peak germania concentration greater than 0.2 wt percent, said depressed annular region comprising a depressed-index having a refractive index delta less than about −
Specification