D. Lee Kohki Shibahara Takayuki Kobayashi Takayuki Mizuno Hidehiko Takara Akihide Sano Hiroto Kawakami T. Nakagawa Yutaka Miyamoto Adaptive MIMO equalization for few-mode fiber transmission with various differential mode delays. 1-3 2015 ECOC https://doi.org/10.1109/ECOC.2015.7341863 conf/ecoc/2015 db/conf/ecoc/ecoc2015.html#LeeSKMTSKNM15