“…These series of papers (Part I, this paper, and part II following [27]) are motivated by the desire to fill, at least in part, this lack. In this paper we propose and develop an analysis method based on the Azimuthal Fourier Decomposition (AFD) of the fiber's modes.The method, when applied to ideal TLFs shows a good ability in predicting the TLFs loss and provides semianalytical expression for CL.…”