Spectrally efficient SBS suppression via seed laser current modulation

W. X. Wong; S. Q. Lee; W. Y. Lim; Y. E. Ye

doi:10.1117/12.3008221

12 March 2024 Spectrally efficient SBS suppression via seed laser current modulation

W. X. Wong, S. Q. Lee, W. Y. Lim, Y. E. Ye

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 128650E (2024) https://doi.org/10.1117/12.3008221
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We report a novel approach to linewidth broadening of the seed laser spectrum for the suppression of Stimulated Brillouin Scattering (SBS) in high power fiber lasers. The seed laser linewidth is broadened through frequency modulation induced by current modulation of a Distributed-Feedback (DFB) laser, while the amplitude modulation is suppressed through a similar, out-of-phase current modulation of a Semiconductor Optical Amplifier (SOA). This approach produces an ideal, uniformly distributed seed laser spectrum for efficient suppression of SBS. SBS suppression is demonstrated on a 1kW fiber amplifier with 95% of output power within a 5.5GHz linewidth (5.7GHz FWHM).

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

W. X. Wong, S. Q. Lee, W. Y. Lim, and Y. E. Ye "Spectrally efficient SBS suppression via seed laser current modulation", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 128650E (12 March 2024); https://doi.org/10.1117/12.3008221

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