An application of L2L2 nonlinear control and gain scheduling to erbium doped fiber amplifiers

This paper presents an application of control theory towards suppressing cross-gain modulation effects in erbium doped fiber amplifiers (EDFAs). These effects arise due to sudden input power changes at network reconfiguration or system faults. An extended nonlinear model of the EDFA is derived, including amplified spontaneous emission (ASE). Two novel EDFA control applications are developed and compared: one based on L2L2 nonlinear control and the other based on optimized gain scheduling. The design of each control law is subject to realistic physical constraints as encountered in industrial application.