Broadband optical fiber
AssigneeFurukawa Electric Co., Ltd.
InventorTaeko Shibuta
Life of this patent
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Abstract
Provided is an optical fiber that is in particular suitable for Raman amplification. An effective area at a wavelength of 1570 nm is in a range of 35 μm2 to 45 μm2, an absolute value of a dispersion slope at the wavelength is equal to or less than 0.04 ps/nm2/km, and a dispersion value at the wavelength is in a range of 5 ps/nm/km to 10 ps/nm/km. It is desirable that a refractive index profile contains at least one annular region between a center core and a cladding region.
Claims20
An optical fiber comprising a core and cladding and having characteristics in that:
- an effective area Aeff at a wavelength of 1570 nm is in a range of 35 μm2 to 45 μm2;
- an absolute value of a dispersion slope at the wavelength is equal to or less than 0.04 ps/nm2/km;
- and
- a dispersion value at the wavelength is in a range of 5 ps/nm/km to 10 ps/nm/km.
An optical fiber comprising a center core, cladding and annular region between the center core and cladding and having a relative refractive index difference Δ1 of less than or equal to 0.7% where Δ1 is the relative index difference of maximum refractive index of said center core to the refractive index of said cladding region and Aeff less than or equal to 45 μm2 at an optical signal wavelength of 1570 nm where Aeff is the effective area, wherein the optical fiber further is defined by the following characteristics;
- Δ1≧0.55%
- −0.7%≦Δ2≦−0.5%
- 1.2≦b/a≦1.5
- 9 μm≦b≦12 μm,
- where Δ2 is the relative index difference of the minimum refractive index of said annular region to the refractive index of said cladding region, “a” is a diameter of said center core and “b” is an outside diameter of said annular region.
Dependencies are inferred from the claim text.