Multimode optical fiber core cane classification method

Abstract

Methods for classifying a core cane of an multimode optical fiber are disclosed. In embodiments, the method includes determining a relative refractive index profile Δ(r) of the core cane; fitting the relative refractive index profile Δ(r) to an alpha profile Δ(r) defined by: where Δis a relative refractive index at a longitudinal centerline of the core cane, αis a core shape parameter, and ais an outer radius of the core cane; generating a non-alpha residual profile Δ(r)=Δ(r)−Δ(r) for the core cane; computing one or more metrics from Δ(r), and using the one or metrics in a classification of the core cane, the classification comprising a prediction of whether a bandwidth at a pre-determined wavelength of an optical fiber drawn from a preform comprising the core cane exceeds a pre-determined bandwidth at the pre-determined wavelength.