STAMATIOS V. KARTALOPOULOS, PhD, is currently Williams Professor in Telecommunications Networking in the Telecommunications graduate program of the University of Oklahoma, Tulsa. Previously, he enjoyed a twenty-two year tenure with such telecom giants as Bell Labs, Lucent Technologies, and AT&T. Dr. Kartalopoulos's previous optical networking texts include Understanding SONET/SDH and ATM: Communications Networks for the Next Millennium, Introduction to DWDM Technology: Data in a Rainbow, Fault Detectability in DWDM: Towards Higher Signal Quality and System Reliability, and DWDM Networks, Devices, and Technology, all published by Wiley IEEE Press.