Pseudo-random binary sequency phase modulation in high power Yb-doped fiber amplifiers

Craig Robin; Iyad Dajani; Clint Zernigue; Angel Flores; Ben Pulford; Ann Lanari; Shadi Naderi

doi:10.1117/12.2004486

22 March 2013 Pseudo-random binary sequency phase modulation in high power Yb-doped fiber amplifiers

Craig Robin, Iyad Dajani, Clint Zernigue, Angel Flores, Ben Pulford, Ann Lanari, Shadi Naderi

Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 86010Z (2013) https://doi.org/10.1117/12.2004486
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.2004486

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