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22 March 2013 Pseudo-random binary sequency phase modulation in high power Yb-doped fiber amplifiers
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We present experimental and theoretical studies on the stimulated Brillouin scattering (SBS) threshold in fiber amplifiers seeded with a spectrally broadened single-frequency laser source. An electro-optic phase modulator is driven with various pseudo-random binary sequence (PRBS) patterns to highlight the unique characteristics of this linewidth broadening technique and its facility in SBS mitigation. Theoretical predictions show a variation in SBS suppression based on PRBS pattern and modulation frequency. These predictions are experimentally investigated in a kilowatt level monolithic fiber amplifier operating with near diffraction-limited beam quality. We also show Rayleigh scattering and other sources of back reflected light in phase modulated signals can seed the SBS process and significantly reduce the nonlinear threshold.
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Craig Robin, Iyad Dajani, Clint Zernigue, Angel Flores, Ben Pulford, Ann Lanari, and Shadi Naderi "Pseudo-random binary sequency phase modulation in high power Yb-doped fiber amplifiers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010Z (22 March 2013);

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