Giulio Colavolpe Tommaso Foggi Enrico Forestieri Giancarlo Prati Optimal Electrical Processing in Multilevel Optical Systems Insensitive to GVD and PMD. 5385-5389 2008 ICC http://dx.doi.org/10.1109/ICC.2008.1009 conf/icc/2008 db/conf/icc/icc2008.html#ColavolpeFFP08