THOMAS PFEIFFER is leading the optical access research activities at Alcatel-Lucent Bell Labs. His multi-location group is presently elaborating architectures for open metro-access networks, system technologies for PON evolution as well as low cost solutions for operation and maintenance of such systems and networks. His group is closely collaborating with the ALU product development teams and is actively involved in related standardisation work. The group is also well represented in international research projects, conferences and publications and holds many patents in the field. After finishing his PhD on ultrafast opto-electronic phenomena in semiconductors at the Max-Planck-Institute in Stuttgart Thomas became active in telecoms related research at Alcatel. For more than 25 years he has doing research into various optical systems related topics, both on the networking and on the physical layer. His main expertise is in signal transmission, multiplexing technologies, modulation formats, linear and nonlinear optical components and phenomena as well as in system and network architectures and operations for metro and access.