Numerical study on a single-mode continuous-wave thermally guiding very-large-mode-area fiber amplifier

作者：Cao, Jianqiu; Liu, Wenbo; Ying, Hanyuan; Chen, Jinbao^*; Lu, Qisheng

来源：Laser Physics, 2018, 28(3): 035105.

DOI：10.1088/1555-6611/aa9fb0

• fiber amplifiers
• very-large-mode-area fibers
• thermal effects
• thermal lensing

The characteristics of a single-mode continuous-wave thermally guiding very-large-mode-area fiber amplifier are investigated numerically using the rate-equation model while taking thermal transfer into account. It is revealed that the seed power should play an important role in the fiber amplifier and should be large enough to ensure high output efficiency. The effects of three pumping schemes (i.e. the co-, counter-and bi-directional pumping schemes) and the initial refraction index difference are also studied. It is revealed that the optimum fiber length changes with the pumping scheme, and the initial refraction index difference should be lower than 10-4 in order to ensure the linear increment of the output signal power with the pump power. Furthermore, a brief comparison between the thermally induced waveguides in the fiber amplifiers for three pumping schemes is also made.

• 出版日期2018-3
• 单位中国人民解放军国防科学技术大学