Compensation of profile dispersion in graded-index optical fibres

As the profile dispersion parameter P of graded-index fibres is wavelength-dependent. Marcatili´s condition for achieving high bandwidth is usually satisfied only in a narrow wavelength range, if at all. This behaviour can be compensated by a wavelength-dependent refractive-index profile. This letter presents a profile function that compensates for a broad class of profile dispersions and may become a design criterion for fibres in the future, although its practical applicability is presently restricted by the limited variety of available glasses.