In recent years, some researches have been done on simultaneous monitoring of multivariate process mean vector and covariance matrix. However, the effect of measurement error, which exists in many practical applications, on the performance of these control charts is not well studied. In this paper, the effect of measurement error with linearly increasing variance on the performance of ELR contr...

In this paper, different kinds of optical performance monitoring (OPM) techniques, in particular the optical signal-tonoise ratio (OSNR) monitoring and chromatic dispersion (CD) monitoring, are reviewed. Then recent trend of multipleparameter simultaneous monitoring is examined.

.................................................................................................................... 3 INTRODUCTION ............................................................................................................ 5 Chapter 1 MONITORING ............................................................................................. 7 1.1 Approaches to the study of Prefro...