Mr. Tianjia Xu Profile

Tianjia Xu

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Proceedings Article | 28 December 2022 Poster + Presentation + Paper

Study on the simulation of YDFA and reabsorption effect

Tianjia Xu, Xinyang Su

Proceedings Volume 12310, 1231015 (2022) https://doi.org/10.1117/12.2655021

KEYWORDS: Absorption, Ytterbium, Signal processing, Fiber lasers, Cladding, Spontaneous emission, Fiber amplifiers, Continuous wave operation, Signal attenuation, Modeling

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In this paper, the rate equation of ytterbium ion concentration in the upper level and the transmission equations of seed signal, pump, and amplified spontaneous emission (ASE) are solved simultaneously by the explicit Runge Kutta method. Finally, a full spectral range of 1000~1130 nm seed power spectrum simulation is achieved. This paper focuses on the amplification of the seed signal at different peak wavelengths in different fiber lengths. The main works are as follows: The accuracy of calculation results by the iterative method has been improved. By constructing 3D data structure of seed signal, a parallel computing work on the propagation process of Gaussian-lineshape seed spectrum with a peak wavelength of 1020–1100 nm in ytterbium-doped fiber with a length of 1–30 m has been done, which makes the calculation time is significantly reduced. Finally, the reabsorption effect of seed signal at different peak wavelengths and the competition between the seed signal and ASE has been analyzed, and the optimal gain fiber length corresponding to the different peak wavelengths of the seed signal has also been discussed.

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