High-efficiency 1550-nm fiber amplifier with hybrid pumping

We mainly study the conversion efficiency of Erbium/Ytterbium (Er/Yb) co-doped silicate glass fiber (Nufern PM-EYDF-12/130-HE) under different pump wavelengths, pump methods, gain fiber length and input signal power. Through a series of experimental studies, it is found that the hybrid pump mode of multi-mode pump diodes at 976 nm and 915 nm/940 nm are more efficient than that of single-wavelength pumping. When the input signal power is 85 mW, the fiber length is 3.9 m, the hybrid pump power of 976 nm and 940 nm is 10 W respectively, the output optical power can reach 6.41 W, and the optical-to-optical conversion efficiency is 33.7 %, and the signal-to-noise ratio (SNR) is more than 45 dB. When the hybrid pump power of 976 nm and 915 nm is 10 W respectively, the output power can reach 6.31 W, and the PPCE is 33 %. Under the condition of 20 W reverse pump power, the optical-to-optical efficiency of 976 nm, 915 nm and 940 nm single-wavelength pump is 30.7 %, 25.2 % and 21.7 % respectively.