Patent ID: 6337942
Filing Date: 2002-01-08
Classification: G02B

Abstract:
An optical fiber comprising:a core extending along a predetermined axis; an inner cladding which is a region provided at the outer periphery of said core and has a refractive index lower than that of said core; and an outer cladding which is a region provided at the outer periphery of said inner cladding and has a refractive index lower than that of said core but higher than that of said inner cladding; wherein the relative refractive index difference of said core with respect to said outer cladding is at least 0.30% but not greater than 0.50%, the relative refractive index difference of said inner cladding with respect to said outer cladding is at least âˆ’0.50% but not greater than âˆ’0.02%, the dispersion at a wavelength of 1.55 &mgr;m is greater than 18 ps/nm/km, and the effective cross-selectional area Aeff at the wavelength of 1.55 &mgr;m is at least 70 &mgr;m2.