Phase modulation signals optimization automatically for suppression of stimulated Brillouin scattering

Min Jiang; Yang Ran; Rongtao Su; Pu Zhou

doi:10.1117/12.2245671

9 November 2016 Phase modulation signals optimization automatically for suppression of stimulated Brillouin scattering

Min Jiang, Yang Ran, Rongtao Su, Pu Zhou

Proceedings Volume 10016, High-Power Lasers and Applications VIII; 100160U (2016) https://doi.org/10.1117/12.2245671
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

Phase modulation of the signal laser into multiple laser-lines is one of the common methods to suppress the stimulated Brillouin scattering (SBS) effect in high power narrow linewidth fiber amplifiers. In order to achieve optimal effect, the multiple laser-lines should have equal amplitudes. In this paper, the phase modulation signal we employed is the sum of a finite number of sinusoidal signals with different initial phases and different weights. The stochastic parallel gradient descent (SPGD) algorithm is used to search for the optimal initial phases and weights. Through numerical simulation, we obtain homogeneous symmetrical spectra with 11, 19 and 29 lines whose mean square errors of power density are less than 3%.

Citation Download Citation

Min Jiang, Yang Ran, Rongtao Su, and Pu Zhou "Phase modulation signals optimization automatically for suppression of stimulated Brillouin scattering", Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100160U (9 November 2016); https://doi.org/10.1117/12.2245671

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