Abstract
Fiber Raman amplification (FRA) systems, based on the stimulated Raman scattering (SRS) effect, can effectively amplify the Raman signals with tremendous application potentials. The FRA systems can transmit the pump and signal simultaneously in the same Raman gain fiber, and effectively shift the optical power from the stronger pump light to the initial weaker signal through the nonlinear Raman process. However, there are always several other nonlinear processes co-existing and competing within the same Raman fiber. These nonlinear effects, in particular the stimulated Brillouin scattering (SBS), severely restrict the maximum output power of the FRA systems. Beginning with the general polarization states, the analysis of polarization mixing efficiency for stimulated Raman and Brillouin scatterings in optical fibers is firstly presented. Considering the polarization mixing efficiency and pump depletion effect, the Brillouin suppression effect induced by the polarization rotation under the influence of an external magnetic field in the fiber Raman amplification systems is fully explained. Based on the polarization mixing analysis, a novel technical scheme for Brillouin scattering suppression, utilizing the principle of Faraday rotation effect with an auxiliary magnetic field, is proposed and analyzed. The numerical analysis indicates that such a magnetic-field-induced suppression scheme can achieve an extra 3-dB Brillouin gain suppression without sacrificing the co-existing Raman amplification gain.
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This work is supported by the National Natural Science Foundation of China (No. 62105153).
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Jiang, Y., Zhang, Y., Luo, S. et al. Polarization mixing efficiency and novel magnetic-field-induced SBS suppression for FRA systems. Opt Quant Electron 56, 949 (2024). https://doi.org/10.1007/s11082-024-06870-1
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DOI: https://doi.org/10.1007/s11082-024-06870-1