
7
Optical performance monitoring
Alan E. Willner
*
, Zhongqi Pan
†
, and Changyuan Yu
‡
*
University of Southern California, Los Angeles, CA, USA
†
Department of Electrical and Computer Engineering, University
of Louisiana at Lafayette, USA
‡
Department of Electrical and Computer Engineering, National
University of Singapore, Singapore
7.1 INTRODUCTION
Today’s optical networks function in a fairly static fashion and are built to operate
within well-defined specifications. This scenario is quite challenging for higher-
capacity systems, since n etwork paths are not static and channel-degrading effects
can change with temperature, component drift, aging, and fiber ...