摘要
We demonstrate a 202 W all polarization-maintaining(PM)single-frequency fiber amplifier operating at the C band.Simulations show that the length of the output fiber pigtail following the gain fiber critically has a great impact on stimulated Brillouin scattering(SBS),posing a major obstacle for high-power single-frequency amplification.Optimizing the length to suppress the backward SBS by~10 d B,we experimentally achieved a maximum output power of 202 W,yielding an optical-to-optical efficiency of 42%.The signal-to-noise ratio(SNR)of signal light,relative to amplified spontaneous emission(ASE)in Er^(3+)and Yb^(3+)bands,was measured to be 23 and 32 dB,respectively,and it can be further improved by ASE suppression and filtering techniques during amplification.To the best of our knowledge,this is the all-PM single-frequency fiber amplifier with the highest power reported in the C band.
基金
supported by the National Natural Science Foundation of China(Nos.U22A6003 and 62175122)。
