+26 dBm output power from an engineered cladding-pumpedytterbium-free EDFA for L-band WDM applications

Design of double-clad erbium-doped holey fiber amplifier

“…Anyhow, long fibers are required to obtain an appreciable gain. In fact, the size of the inner cladding, required to the larger pump powers, permits a uniform and efficient but slow absorption of pump power by the erbium-doped core [9,17].…”

“…The cladding pumping technique allows the propagation of much larger optical pump powers in the fiber inner cladding, without exciting non-linear effects, and by reducing the thermal loading density. Thus they have a potential for a lot of practical applications such as laser welding, fiber amplifiers for wavelength division multiplexing (WDM) [9] and analog community antenna television (CATV) architecture [10]. In particular, cladding pumping of erbium-doped fibers allows the employment of multimode sources, at the wavelength k = 980 nm, and simplified amplifier set-up [9,11].…”

“…Thus they have a potential for a lot of practical applications such as laser welding, fiber amplifiers for wavelength division multiplexing (WDM) [9] and analog community antenna television (CATV) architecture [10]. In particular, cladding pumping of erbium-doped fibers allows the employment of multimode sources, at the wavelength k = 980 nm, and simplified amplifier set-up [9,11]. As an example, about 26 dB m output power was obtained via an ytterbium-free erbium-doped amplifiers, thus overcoming all the negative effects of phosphorous, generally employed to increase energy transfer from ytterbium to erbium ions [9].…”

“…In particular, cladding pumping of erbium-doped fibers allows the employment of multimode sources, at the wavelength k = 980 nm, and simplified amplifier set-up [9,11]. As an example, about 26 dB m output power was obtained via an ytterbium-free erbium-doped amplifiers, thus overcoming all the negative effects of phosphorous, generally employed to increase energy transfer from ytterbium to erbium ions [9].…”

Spectrally flat and high-power Er-Yb amplifier for telecommunications applications

“…Erbiumdoped fiber amplifiers (EDFAs) are of limited use to fulfill this task because of the relatively low solubility or Er ions in silica and their relatively low absorption level. As a result, EDFAs are typically limited to a few hundreds of mW, even when using double-cladding Erbium-doped fiber geometry [1].…”