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US 7,440,663 B2Granted
Single-mode optical fiber
AssigneeFujikura Ltd.
InventorsShoichiro Matsuo, Hiroshi Kutami, Kuniharu Himeno, Hiroyuki Sawano
Life of this patent
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Abstract
A single-mode optical fiber has a cut-off wavelength of 1260 nm or less, a zero-dispersion wavelength in the range of 1300 nm to 1324 nm, a zero-dispersion slope of 0.093 ps/nm2/km or less, a mode field diameter at a wavelength of 1310 nm in the range of 5.5 μm to 7.9 μm, and a bending loss of 0.5 dB or less at a wavelength of 1550 nm, the bending loss being produced when the fiber is wound around a 10-mm radius for 10 turns.
Claims9
A single-mode optical fiber comprising:
- a central core which has a radius r1 and a refractive index n1;
- an inner cladding which is provided around an outer circumference of the central core and has a radius r2 and a refractive index n2;
- a trench portion which is provided around an outer circumference of the inner cladding and has a radius r3 and a refractive index n3;
- and
- an outer cladding which is provided around an outer circumference of the trench portion and has a radius r4 and a refractive index n4, wherein:
- n1>n4≧n2>n3,
- a cut-off wavelength is not greater than 1260 nm,
- a zero-dispersion wavelength is between 1300 nm and 1324 nm,
- a zero-dispersion slope is not greater than 0.093 ps/nm2/km,
- a mode field diameter at a wavelength of 1310 nm is between 5.5 μm and 7.9 μm,
- a bending loss produced if the fiber is wound around a 10-mm radius for 10 turns is not greater than 0.5 dB at a wavelength of 1550 nm,
- 1.5<r2/r1<3.0, and
- 0.5<(r3−r2)/r1<3.0.
10 more elements
A single-mode optical fiber, comprising:
- a central core which has a radius r1 and a refractive index n1;
- an inner cladding which is provided around an outer circumference of the central core and has a radius r2 and a refractive index n2;
- and
- an outer cladding which is provided around an outer circumference of the inner cladding and has a radius r4 and a refractive index n4, wherein:
- n1>n4>n2,
- a cut-off wavelength is not greater than 1260 nm,
- a zero-dispersion wavelength is between 1300 nm and 1324 nm,
- a zero-dispersion slope is not greater than 0.093 ps/nm2/ km,
- a mode field diameter at a wavelength of 1310 nm is between 5.5 μm and 7.9 μm, and
- a bending loss produced if the fiber is wound around a 10-mm radius for 10 turns is not greater than 0.5 dB at a wavelength of 1550 nm.
7 more elements
Dependencies are inferred from the claim text.