A 3-stage structure L-band EDFA is introduced to enhance the poor power conversion efficiency by utilizing the wasted
ASE from the third EDF section and pump bypass in 1-2 stage. The results indicate that the EDFA could provide low-noise,
high-gain and large-flatness ranging from 1570 to 1610 nm.
An improved simulation model of switchable dual-wavelength laser has been proposed, with which the different
stabilization behaviors with dual-wavelength lasers based on inhomogeneous and homogeneous active media have been
analyzed. The numerical results shows that only one wavelength lasing can be supported by selecting appropriate lasing
parameters, which can well explain the switching behavior of dual-wavelength switchable lasers by controlling some
lasing parameters such as the pump power into gain media or the lasing intensity and wavelength of injected signal
channel.
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