Abstract
Transient-gain response of optical amplifiers to addition/removal of channels represents a major problem in multiwavelength optical networks. To avoid error bursts in the surviving channels, signal-power fluctuations due to channel addition or removal caused by network reconfigurations or line failures must be minimised. The recently proposed and experimentally tested inversion and gain-locking technique for erbium-doped fibre amplifiers (EDFAs), based on pump power loss monitoring, is analysed. The analysis is based on the application of a comprehensive large-signal numerical model which incorporates temporal properties and the downstream and upstream propagation of signal, pump and amplified spontaneous emission (ASE) in an erbium-doped fibre amplifier. It follows from the theoretical investigation that the surviving channel-power excursion in a single 20 dB gain EDFA can be reduced to 0.3 dB through the addition/removal of six channels in an eight-channel multiwavelength system when the pump-power-feedback parameters are appropriately selected.
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