FRED BUCHALI received the diploma degree in electrical engineering in 1988 and the PhD degree in 1991 from Humboldt-University Berlin. During his PhD he worked on InGaAs/InP p-i-n photodiodes for fibre-optic communication. 1992 Fred Buchali joined Alcatel-Lucent Germany. He was involved in development of high speed pin photodiodes including packaging. Since 1999 he works with optical transmission systems group, where he investigated the mitigation of transmission impairments in 10, 40 and 100 Gb/s systems by optical, analog and digital electronic means. His current research interests cover coherent systems for 1Tb/s and beyond using higher level modulation based on single carrier and multi carrier approaches.