Progress on European Union Project MODEGAP

I review the objectives and achievements of EU project MODE GAP describing the significant progress made in MIMO-based Mode Division Multiplexing in both solid and hollow core fibres. The approach has progressed from little more than a concept at the start of project though to field experimentation in just over three years. The rapid progress has been enabled by major advances at all levels of the required technology chain, ranging from fundamental measurements of glass roughness, through the development of advanced DSP algorithms, to high capacity system experiments.