Selective excitation in multimode fiber using elliptical few mode fiber

The endless growth of the Internet and its applications compels us to introduce new technologies and solutions for increasing data bandwidth demands. In this paper, we propose a technique for selective excitation of fifteen mode groups in a multimode fiber (MMF) using an elliptical few mode fiber (FMF). The elliptical FMF was designed using finite difference beam propagation method and inserted as a pre-compensator before a MMF channel in a numerical optical system to evaluate its modal properties and transmission quality. For performance comparison, the elliptical FMF-pre-compensated MMF optical fiber system is compared with a non-pre-compensated optical consisting of only a MMF. The obtained results show that the elliptical FMF improves the modal purity of the channels and the bit error rate (BER).