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Stimulated Brillouin scattering threshold variations due to bend-induced birefringence in a non-polarizationmaintaining fiber amplifier

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Stimulated Brillouin scattering threshold variations due to bend-induced birefringence in a non-polarizationmaintaining fiber amplifier

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  • Author: C. Guintrand, J. Edgecumbe, K. Farley, J. Abramczyk, K. Tankala
Stimulated Brillouin scattering (SBS) is a major impediment in achieving high output power fiber amplifiers with narrow linewidth operation. Doped LMA fibers are widely used to achieve kW-level amplifiers due to larger effective area and pump coupling capabilities. Even in few-moded LMA fibers, coiling is necessary to suppress higher modes [1] and achieve near diffraction limited beam quality. For many applications controlling the output state of polarization (SOP) is critical. This can be achieved by incorporating all polarization maintaining (PM) fiber in the amplifier or by using strictly non-PM fiber and implementing a feedback loop to control the polarization state output.

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