Dispersion-shifted fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakatoshi Kato, Eisuke Sasaoka, Shinji Ishikawa
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Abstract
The present invention aims to provide a dispersion-shifted fiber which can effectively restrain nonlinear optical effects from occurring and has a configuration suitable for long-haul light transmission. The dispersion-shifted fiber has, as various characteristics at a wavelength of 1,550 nm, a dispersion level of 1.0 to 4.5 ps/nm/km in terms of absolute value, a dispersion slope not greater than 0.13 ps/nm.sup.2 /km in terms of absolute value, an effective core cross-sectional area not less than 70 .mu.m.sup.2, and a transmission loss not greater than 0.25 dB/km with respect to light in a 1.55-.mu.m wavelength band.
Claims18
A dispersion-shifted fiber having a zero-dispersion wavelength out of a wavelength band of 1.53 to 1.56 .mu.m and having as characteristics at a wavelength of 1,550 nm;
- a dispersion level of 1.0 to 4.5 ps/nm/km in terms of absolute value;
- a dispersion slope not greater than 0.13 ps/nm.sup.2 /km in terms of absolute value;
- an effective core cross-sectional area not less than 70 .mu.m.sup.2 ;
- and
- a transmission loss not greater than 0.25 dB/km with respect to light in a 1.55-.mu.m wavelength band.
A dispersion-shifted fiber having a zero-dispersion wavelength out of a wavelength band of 1.53 to 1.56 .mu.m and having:
- a dispersion level of 1.0 to 4.5 ps/nm/km in terms of absolute value at a wavelength of 1,550 nm;
- and
- a transmission loss not greater than 0.25 dB/km with respect to light in a 1.55-.mu.m wavelength band;
- wherein said dispersion-shifted fiber comprises a core region and a cladding region,
- said cladding region comprising:
- an inner cladding disposed around the outer periphery of said core region;
- and
- an outer cladding disposed around the outer periphery of said inner cladding, said outer cladding having a refractive index higher than that of said inner cladding.
- an effective area not less than 70 .mu.m.sup.2 at the wavelength of 1,
Dependencies are inferred from the claim text.