Practically Feasible Closed Loop Digital Predistortion for VCSEL MMF Based Radio over Fiber links
The article demonstrates a novel Digital Predistortion (DPD) architecture for Mobile Front Haul links for the advanced Long Term Evolution (LTE) and upcoming 5G networks. Precisely, the use of a feedback approximation method has been proposed and experimentally demonstrated herein that simplifies the complexities in realizing the practical DPD technique for Multi Mode VCSELs and Multi Mode Fibers based Radio over Fiber systems. As a figure of merit, linearization efficiency is provided in terms of Adjacent Channel Power Ratio, Normalized Mean Square Error and Error Vector Magnitude referring to a complete LTE frame occupying 10 MHz with 256 QAM modulation format.