Patent ID: 8705922

Claim:
An optical fiber comprising a glass core and a glass cladding surrounding and in direct contact with the glass core, wherein: the glass core comprises: a radius R.sub.1 from 8 .mu.m to 13 .mu.m; a graded refractive index profile with an alpha value greater than or equal to 1.8 and less than 2.2 at a wavelength of 1550 nm; a maximum relative refractive index .DELTA..sub.1MAX from 0.6% to 0.95% relative to the glass cladding; an effective area of LP01 mode between 80 .mu.m.sup.2 and 110 .mu.m.sup.2, the glass core supporting the propagation and transmission of an optical signal with X LP modes at a wavelength of 1550 nm, wherein X is an integer greater than 1 and less than 10; and the glass cladding comprises a maximum relative refractive index .DELTA..sub.4MAX such that .DELTA..sub.1 MAX>.DELTA..sub.4MAX, wherein the optical fiber has a maximum differential group delay of less than or equal to about 150 ps/km at a wavelength of 1550 nm.