Erbium-doped fiber amplifier gain characteristics inside active delay line structures

E.H.W. Chan, R.A. Minasian

Research output: Contribution to journalArticlepeer-review


A systematic study of how the erbium-doped fiber amplifier (EDFA) gain behaves inside an active recirculating delay line structure is presented. It is verified using a representation of an active-fiber Bragg-grating-pair filter. It shows that due to the presence of the recirculating signal, the EDFA gain inside the cavity exhibits hard saturation, and with a proper design, fluctuations in pump power have only slight effects on EDFA gain and this enables the active delay line filter to realize a stable high-Q frequency re- sponse. Results demonstrate a high-Q photonic signal processing filter that exhibits low sensitivity to pump power perturbations and which shows robust active filter operation.
Original languageEnglish
Pages (from-to)2338-2340
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number10
Publication statusPublished - Oct 2004
Externally publishedYes


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