Proposed solid-state Faraday anomalous-dispersion optical filter
  We propose a Faraday anomalous dispersion optical filter (FADOF) based on a rare-earth ion doped crystal. We present theoretical analyses for the solid-state FADOF transmission. Our theoretical model predicts a maximum transmission efficiency of 71% and a double-peaked transmission spectrum with a bandwidth of 6 GHz under current experimental conditions. Our proposal may have important applications in optical communications. 
Wei-Bin Lin, Zong-Quan Zhou, Chuan-Feng Li and Guang-Can Guo
quant-ph physics.optics