Dispersion-equalizing optical fiber and optical transmission line including the same
AssigneeSumitomo Electric Industries, Ltd.
InventorsMasao Tsukitani, Eisuke Sasaoka, Shigeru Tanaka
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Abstract
The present invention relates to an optical transmission line enabling WDM communications in a wide signal light wavelength band centered at a wavelength of 1.55μm, in which nonlinear optical phenomena are less likely to occur; and an optical fiber constituting a part of the optical transmission line. The optical fiber has a dispersion D (unit:ps/nm/km) and a dispersion slope S (unit:ps/nm2/km) satisfying the conditions of −69≦D≦−35 and 0.0050×D≦5≦0.0025×D; and, as characteristics with respect to light having a wavelength of 1.55 μm an effective area of 15 μm2 or more and a bending loss of 50 dB/m or less when wound at a diameter of 20 mm.
Claims69
A dispersion-equalizing optical fiber constituting a part of an optical transmission line;
- wherein said dispersion-equalizing optical fiber comprises a core extending along a predetermined axis, an outer cladding provided on the outer periphery of said core, and a depressed region provided between said core and said outer cladding;
- wherein said dispersion-equalizing optical fiber has a dispersion D (unit:
- ps/nm/km) and a dispersion slope S (unit:
- ps/nm2/km) satisfying the following conditions:
- −57≦D≦−28.5
- 0.0050×D≦S≦0.0025×D
- at a wavelength of 1.55 μm;
- wherein said dispersion-equalizing optical fiber has, at the wavelength of 1.55 μm, an effective area of 15 μm2 or more, and a bending loss of 50 dB/m or less when wound at a diameter of 20 mm;
- wherein said depressed region has a refractive index lower than those of both said core and said outer cladding;
- and
- wherein a ratio Ra of an outer diameter of said core with respect to that of said depressed region is greater than 0.4.
A dispersion-equalizing optical fiber constituting a part of an optical transmission line;
- said dispersion-equalizing optical fiber comprising:
- a core extending along a predetermined axis, said core having a predetermined refractive index;
- an outer cladding provided on the outer periphery of said core;
- and
- a depressed region provided between said core and said outer cladding, said depressed region having a refractive index lower than those of both said core and said outer cladding;
- said dispersion-equalizing optical fiber having a dispersion D (unit:
- ps/nm/km) and a dispersion slope S (unit:
- ps/nm2/km) satisfying the following conditions:
- −57≦D≦−28.5
- 0.0050×D≦S≦0.0025×D
- at a wavelength of 1.55 μm;
- said dispersion-equalizing optical fiber having, at the wavelength of 1.55 μm, an effective area of 17 μm2 or more;
- and
- a ratio Ra of an outer diameter of said core with respect to that of said depressed region being greater than 0.4.
A dispersion-equalizing optical fiber constituting a part of an optical transmission line;
- wherein said dispersion-equalizing optical fiber comprises a core extending along a predetermined axis, an outer cladding provided on the outer periphery of said core, and a depressed region provided between said core and said outer cladding;
- wherein said dispersion-equalizing optical fiber has a dispersion D (unit:
- ps/nm/km) and a dispersion slope S (unit:
- ps/nm2/km) satisfying the following conditions:
- −57≦D≦−28.5
- 0.0050×D≦S≦0.0025×D
- at a wavelength of 1.55 μm;
- wherein said dispersion-equalizing optical fiber has, at the wavelength of 1.55 μm, an effective area of 19 μm2 or more, and a bending loss of 50 dB/m or less when wound at a diameter of 20 mm;
- wherein said depressed region has a refractive index lower than those of both said core and said outer cladding;
- and
- wherein a ratio Ra of an outer diameter of said core with respect to that of said depressed region is greater than 0.4.
Dependencies are inferred from the claim text.