Simulations of multiwavelength cladding pumping of high-power fiber Raman amplifiers

Zhao, Nan, Hong, Soonki, Harish Achar, V., Feng, Yutong and Nilsson, Johan (2019) Simulations of multiwavelength cladding pumping of high-power fiber Raman amplifiers. Optical Engineering, 58 (10), [102701]. (doi:10.1117/1.OE.58.10.102701).

Abstract

We numerically simulate and optimize a high-power fiber Raman amplifier cladding pumped by spectrally combined diode lasers at wavelengths from ~0.9 to ~1µm in the continuous-wave regime. This amplified a signal at the first-Stokes wavelength of 1024 nm. We found that it was possible to add pumps over an increasingly wide wavelength span up to ~90 nm, while still maintaining an incremental conversion efficiency higher than 60%, even though the Raman linewidth is only ~15 nm. We investigated the dependence on the power of individual diode lasers and on the wavelength spacing and found that the total conversion efficiency reaches ~70 % with realistic pump sources based on state-of-the-art diode lasers. We believe this study shows the potential for high-power fiber Raman lasers pumped by spectrally combined multiwavelength diode and fiber laser sources.
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Contributors

Author: Yutong Feng

Author: Johan Nilsson

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