Characterisation of a single mode trapezoidal index fiber by splice loss technique using lateral offset

Abstract

A simple and straight-forward method is presented for prediction of unknown aspect ratio of a given single mode trapezoidal index fiber, using splice loss technique in presence of lateral offset at the splice between them. First, we propose a simple technique to evaluate the modal spot size of trapezoidal index fiber with normalised lateral offset between two such identical fibers taken from same pool. Using this fiber spot size as a test case in splice loss between two perfectly aligned step index and trapezoidal index fiber, we predict the unknown aspect ratio and justify it using a recently available empirical relation and a graphical technique.