26 February 2013 Destructive random backscattering pulses showing Brillouin signature in MOPA fiber laser systems
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Abstract
The origin of random highly peaked backward pulses arising from(in) pulsed master oscillator power amplifier (MOPA) fiber lasers systems is studied. These large amplitude short duration pulses when compared to the Rayleigh backscattering may lead to catastrophic failures. This paper presents a systematic study of the backscatter using different seed sources (externally and directly modulated) in a hardened MOPA setup and a delayed self-heterodyne RF domain spectrum analysis technique for its characterization. Fabry-Perot seeded non-polarization maintaining system is found to show hallmark Brillouin frequency shift. The frequency of occurrence strongly depends on the seed characteristics.
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M. Melo, M. Melo, M. O. Berendt, M. O. Berendt, J. M. Sousa, J. M. Sousa, } "Destructive random backscattering pulses showing Brillouin signature in MOPA fiber laser systems", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86011P (26 February 2013); doi: 10.1117/12.2001898; https://doi.org/10.1117/12.2001898
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