Theoretical analysis on the effect of seed Raman noise on the stimulated Raman scattering suppression of fiber amplifier

Chongwei Wang; Jianqiu Cao; Binyu Rao; Meng Wang; Zefeng Wang

doi:10.1117/12.2627406

28 March 2022 Theoretical analysis on the effect of seed Raman noise on the stimulated Raman scattering suppression of fiber amplifier

Chongwei Wang, Jianqiu Cao, Binyu Rao, Meng Wang, Zefeng Wang

Author Affiliations +

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169CZ (2022) https://doi.org/10.1117/12.2627406
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

In this paper, the quantitative relationship between the seed Raman suppression and output of Yb-doped fiber amplifier is studied theoretically. The analytical formula showing the relationship between the Raman suppression (in dB) in the seed light and output of the fiber amplifier is derived. It is revealed that Raman suppression of the fiber amplifier increases linearly with that of the seed light. It is found that such a relationship can be well kept regardless of the pumping scheme. By the comparison of analytic results and numerical calculation results, it is revealed that there is indeed a linear relationship between two Raman suppressions with the slope agreeing well with the theoretical prediction. However, such a relationship only occurs when the Raman noise power of the seed light is greater than the microwatts level. Once it is less than the microwatts level, the output Raman suppression of the fiber amplifier will not raise with a further increase of seed Raman suppression. It is also found that the law is independent of the output signal power of the seed light as well as the pumping scheme of the fiber amplifier, which is also coincident with the theoretical result.

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Chongwei Wang, Jianqiu Cao, Binyu Rao, Meng Wang, and Zefeng Wang "Theoretical analysis on the effect of seed Raman noise on the stimulated Raman scattering suppression of fiber amplifier", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169CZ (28 March 2022); https://doi.org/10.1117/12.2627406

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KEYWORDS

Fiber amplifiers

Raman scattering

Signal to noise ratio

Fiber lasers

Amplifiers

High power fiber lasers

Ytterbium

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