In this paper, f0 (carrier-envelope offset frequency) with a signal-to-noise ratio of 40 dB is generated in an Yb-doped fiber femtosecond optical frequency comb (Yb-FOFC) .
It is the first time to compare and analyze the effects of direct optical pulse amplification (DOPA) and self-similar amplification (SSA), on the output parameters of the amplifiers, minimal output power of the octave spectrum meeting f0 detection requirements, and the SNR of f0.
The experimental results indicate that under the condition of a low pump power or a low output power, DOPA is preferred in the Yb-FOFC.
However, under the condition of a high pump power or a high output power, SSA is preferred.