Modeling and optimization of add-drop dynamics in gain-clamped fiber amplifiers

A new dynamic model for gain-clamped fiber amplifiers is presented. The mod el can simulate the transient behavior of a gain-clamped erbium-doped fiber amplifier as a function of its controlling parameters. Results show the de tailed dependence of the amplifier gain dynamics on launched pump power and reveal the pump-power penalty incurred in implementing gain control with m inimal transients to power disturbances. The effect on the transients of va rying the laser cavity feedback coupling is also presented. Model accuracy is verified by the excellent quantitative agreement with dynamic measuremen ts over a range of operating conditions. Results show how an increase in pu mp power can effectively suppress both the dynamic and the steady-state sig nal power transients in wavelength-division multiplexing channel add-drop o perations. (C) 2000 Optical Society of America OCIS codes: 060.0060, 060.23 20, 140.3280, 060.2410.