Polarization modulation instability (PMI) is a form of modulation instability that can exist in weakly birefringent optical fibers . Sidebands can be generated by this effect when a polarization mode of the birefringent fiber is excited with an intense optical pump. The polarization state of the sidebands is orthogonal to the polarization of the pump signal. PMI has been observed in microstructured optical fibers (MOFs). PMI was reported in a large-air-filling fraction MOF that was pumped in the normal dispersion regime with visible light . The coherent degradation of femtosecond supercontinuum light generated in all-normal dispersion (ANDi) MOFs due to PMI was recently investigated . Here, we report the experimental observation of PMI effect in ANDi MOFs with picosecond pumping at 1064 nm.
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