20 May 2015 Stimulated Brillouin scattering in optical fibers with end reflections excited by broad-band, phase-modulated pump waves
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Abstract
The transient theory of stimulated Brillouin Scattering (SBS) in optical fibers is used to investigate the effects of feedback of an incident periodic phase-modulated laser field. Phase modulation with a single sine wave and a pseudo-random binary sequence (PRSB) are investigated. It is shown that a reflection as small as 0.001% (-50 dB) of a laser field from the fiber end can lead to enhancement in the reflected power and effectively reduce the SBS threshold if the laser optical spectrum overlaps with the SBS gain spectrum. These results have implications on the design of high power fiber laser systems that utilize periodic phase modulation techniques for broadening the laser field to suppress SBS.
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Mark S. Bowers, Mark S. Bowers, } "Stimulated Brillouin scattering in optical fibers with end reflections excited by broad-band, phase-modulated pump waves", Proc. SPIE 9466, Laser Technology for Defense and Security XI, 94660J (20 May 2015); doi: 10.1117/12.2178393; https://doi.org/10.1117/12.2178393
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