Monomode optical fiber

Abstract

The present invention concerns a monomode optical fiber comprising an optical core for guiding the majority of light waves, surrounded by an optical sheath, the difference between the maximum refraction coefficient of the core and that of the optical sheath being indicated as .DELTA.n and the radius of the core being indicated as a, characterized in that: a .epsilon.›0.6a.sub.c :1.1a.sub.c !, a.sub.c being provided, in .mu.m, by the formula: ##EQU1## where k=2.pi./.lambda., .lambda. being (in .mu.m) the wavelength of the transmission, and where n.sub.g is the coefficient of said optical sheath, equal within 10.sup.-3 to that of pure silica, .DELTA.n is greater than or equal to 0.01, and in that, .phi. being the diameter of said optical sheath, in .mu.m: .phi..epsilon.›.phi..sub.min :100!, .phi..sub.min being provided, in .mu.m, by the formula: ##EQU2## where ##EQU3##

Dependencies are inferred from the claim text.