Multistage fibre amplifier and method for adapting a pump power of a multistage fibre amplifier
A fiber amplifier, pump power technology, applied in multi-level optical transmission, lasers, laser parts and other directions, can solve the problems of signal gain fluctuation, etc., and achieve the effect of improving amplifier function, small insertion attenuation, and improving noise figure
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[0030] exist image 3 The block diagram shown in corresponds in principle to the block diagram shown in FIG. 1 b of a two-stage fiber amplifier with a pump splitter in which the supplied optical signal SIG is amplified. The output signal of the laser diode LD at an emission wavelength of, for example, 980 nm is fed to the pump beam splitter PS, where the total pump signal is divided according to a predetermined division factor. The first part A1 of the total pump signal or the first pump signal is sent to the first amplifier fiber EDF1 through the pump input end of the first wavelength selective coupler WDM1. The additional pump power part A2 is fed to the pump input of the second coupler WDM2 of the second amplifier fiber FDF2 via an additionally inserted and erbium-doped fiber ZFED in the pump path. The shown two-stage fiber amplifier is connected to the conditioning unit R. This can be gain or output power regulation. For regulation purposes, a photodiode PD connected to ...
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