Patent ID: 6360046
Filing Date: 2002-03-19
Classification: G02B

Abstract:
A dispersion-shifted optical fiber comprising a core region extending along a predetermined axis, and a cladding region provided on the outer periphery of said core region, said core region comprising:an inner core whose relative refractive index difference with respect to a reference area of said cladding region is higher in its peripheral portion than in its center portion; and an outer core including, at least, an inner portion provided on the outer periphery of said inner core, and an outer portion provided between said inner portion and said cladding region, the relative refractive index difference of said inner portion with respect to the reference area of said cladding region increasing from the center of said dispersion-shifted optical fiber toward the periphery thereof, the relative refractive index difference of said outer portion with respect to the reference area of said cladding region decreasing from the center of said dispersion-shifted optical fiber toward the periphery thereof, wherein, in the outer portion of said outer core, the ratio of amounts of change of the relative refractive index difference in a radial direction with respect to the thickness of said outer portion in said radial direction is not greater than 1.0%/&mgr;m.