Patent ID: 6804441
Filing Date: 2004-10-12
Classification: G02B,G02F,H01S

Abstract:
An optical fiber comprising: a core; and a cladding region which covers an outer periphery of said core, having a zero-dispersion wavelength in a wavelength range of 1.4 &mgr;m to 1.65 &mgr;m, and being in a single mode in said zero-dispersion wavelength,wherein GeO2 is doped in said core in a quantity such that a relative refractive index difference of said core becomes not less than 1.8%, said cladding region includes a first cladding region which covers an outer periphery of said core, a second cladding region which covers an outer periphery of said first cladding region and a third cladding region which covers an outer periphery of said second cladding region, and a refractive index of said second cladding region is smaller than those of said first cladding region and said third cladding region.