We investigate the dynamic performance of optical gain clamped (OGC) amplifiers. Analyses are based on a new model we have recently proposed to satisfy EDFA and system designer needs. The model allows, for the first time, easy investigation of both Er-Yb doped amplifiers and high-concentration EDFAs where the upconversion process plays a fundamental role. In addition, we calculate and show the transfer function that relates output signal dynamic to amplifier perturbation arising not only from channel add/drop, but also from pump power fluctuation. This allows optimum electronic circuit design and implementation of electronic feedback. The impact on a metro system of next-generation components, such as waveguide amplifiers, is reported. An experimental investigation of Er-(Yb) doped amplifiers has been performed and system experiments in a multiwavelength metro network are reported.