Optical fiber and wavelength division multiplex transmission line
AssigneeFurukawa Electric Co., Ltd.
InventorKazunori Mukasa
Life of this patent
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Abstract
An optical fiber includes center and first side cores. An apparent refractive index differences of the center and first side cores are 1.15 to 1.40% and −0.60 to −0.35, respectively. A constant expressing a profile of a distribution of refractive index of the center core is 1.0 to 5.0. A ratio of diameters of the first side and center cores is 1.6 to 2.4. A dispersion value is −60 to −35 ps/nm/km, a dispersion slope is −0.40 to −0.10 ps/nm2/km, a transmission loss is 0 to 0.35 dB/km, a ratio of loss to dispersion is 120 to 500 (ps/nm)/dB, a polarization mode dispersion is 0 to 0.15 ps/{square root}{square root over (km)}, and an effective core area is 19 to 50 μm2 when the wavelength is 1.55 μm band. A bending loss at a diameter of 20 mm is 0 to 5 dB/m.
Claims20
An optical fiber provided with
- a center core and
- a first side core formed at the outside of said center core, wherein
- an apparent refractive index difference of said center core is 1.15 to 1.40%,
- a constant α expressing a profile of a distribution of refractive index of said center core is 1.0 to 5.0,
- an apparent refractive index difference of said first side core is −0.60 to −0.35,
- a diameter ratio (b/a) of a diameter (b) of said first side core layer to a diameter (a) of said center core is 1.6 to 2.4,
- a dispersion value is −60 to −35 ps/nm/km and a dispersion slope is −0.40 to −0.10 ps/nm2/km when a wavelength of light propagated through said center core is the 1.55 μm band,
- a transmission loss of 0 to 0.35 dB/km, a ratio of loss to dispersion (figure of merit (FOM)) of 120 to 500 (ps/nm)/dB, a polarization mode dispersion (PMD) of 0 to 0.15 ps/{square root}{square root over (km)}, and an effective core area (Aeff) of 19 to 50 μm2 when the wavelength of the light propagated through the center core is the 1.55 μm band, and
- a bending loss at a diameter of 20 mm of 0 to 5 dB/m.
An optical fiber provided with
- a center core and
- a first side core formed at the outside of said center core, wherein
- an apparent refractive index difference of said center core is 0.9 to 1.4%,
- a constant α expressing a profile of a distribution of refractive index of said center core is 1.0 to 5.0,
- an apparent refractive index difference of said first side core is −0.65 to −0.35%,
- a diameter ratio (b/a) of a diameter (b) of said first side core layer to a diameter (a) of said center core is 1.6 to 2.4,
- a dispersion value is −60 to −35 ps/nm/km and a dispersion slope is −0.40 to −0.05 ps/nm2/km when a wavelength of light propagated through said center core is the 1.55 μm band,
- a transmission loss of 0 to 0.35 dB/km, a ratio of loss to dispersion (figure of merit (FOM)) of 120 to 500 (ps/nm)/dB, a polarization mode dispersion (PMD) of 0 to 0.15 ps/{square root}{square root over (km)}, and an effective core area (Aeff) of 19 to 50 μm2 when the wavelength of the light propagated through the center core is the 1.55 μm band, and
- a bending loss at a diameter of 20 mm of 0 to 20 dB/m.
Dependencies are inferred from the claim text.