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Relative amplitude noise transfer function of an Yb3+-doped fiber amplifier chain

: Gierschke, P.; Jauregui, C.; Gottschall, T.; Limpert, J.

Volltext ()

Optics Express 27 (2019), Nr.12, S.17041-17050
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

In this work we measure the frequency dependent transfer function of the amplitude noise for both the seed and pump power in an Yb3+-doped fiber amplifier chain. In particular, the relative intensity noise transfer function of this amplifier chain in the frequency range of 10 Hz – 100 kHz has been investigated. It is shown that the pump power noise of the pre-amplifier stages is transformed into seed power noise for the next amplification stage. Crucially, the seed power noise in the frequency range of interest is strongly damped by the main-amplifier. This, however, does not happen for the pump power noise. Thus, the noise of the pump of the last amplifier stage is the factor with the strongest impact on the overall noise level of the system. Finally, useful guidelines to minimize the output amplitude noise of an Yb3+-doped fiber amplifier chain are given.