Experimental comparison of two pump control schemes for suppressing transient gain excursions in EDFAs

摘要

Experimental results of a comparative study of two closed-loop systems for suppressing transient gain excursions in an erbium-doped fibre amplifier (EDFA) are presented. One of these systems is referred to as the closed-loop system with the additive pump-control block and the other system is referred to as the closed-loop system with the multiplicative pump-control block. In the experimental results, it is observed that the input pump power needs to be clipped only in the closed-loop system with the additive pump-control block. The pump power clipping is required, as the controller is requesting a negative pump power. In the experimental results, the pump power clipping in the closed-loop system with the additive pump-control block is observed to have a negative side effect in the form of large transient EDFA gain excursions. Thus, the closed-loop system with the multiplicative pump-control block can offer significant advantages over the closed-loop system with the additive pump-control block for suppressing the transient EDFA gain excursions.