Dynamic erbium-doped fiber amplifier based on active gain flattening with fiber acoustooptic tunable filters

Optical Communications Systems

“…After that, the gain reduces sharply. Several gain flattening techniques of EDFA are available [Lee et,al 1996;Ono et.al.1997;Kim et.al.1998;Park et.al.1998;Kawai et.al.1999;Yun et al 1999;Lu & Chu 2000;Pasquale & Federighi 1995;Kemtchou et. al.1996;Hwang et al2000;.Bakshi et.al.2001;Sohn et.al.2002;Arbore et.al.2002;Gupta 2009 andLobo et.al.…”

Variable and stable dual-wavelength erbium-doped fiber laser based on fiber acousto-optic variable filter and highly nonlinear fiber

“…The depth and center wavelength of the notch can be tuned by varying the amplitude and the frequency of the applied RF signal to the PZT. Fiber AOTF has been previously used as dynamic gain equalizer for EDFAs [8]. In order to improve the acoustooptic coupling efficiency and to broaden its filtering bandwidth, the fiber was etched in dilute hydrofluoric acid to a diameter of 60 m µ .…”

Status and Trends in All-Fibre Components and Devices

“…For wideband WDM system. the gain equalizing is essential to equalize both signal power and SNR (Signal to Noise Ratio) of multiple channels over a wide spectral bandwidth [14]. Fibre Bragg Grating (FBG) which consist of grating written into specially modifies fibre are versatile All-Fibre Devices which can be used for gain flattening.…”