Extinction ratio of polarization-maintaining fiber length
The polarization extinction ratio (PER), also called polarization cross talk, in polarization-maintaining (PM) fiber-based devices is a key parameter. If you subject the fiber to high mechanical stress and small-diameter bends, then it is possible to disrupt the internal. PER is a parameter used to describe certain polarisation effects in optical fibres and components for optical fibre communication systems. The fiber cables made by Schäfter+Kirchhoff typically have a polarization extinction ≥ 200:1 (23 dB) or ≥ 400:1 (26 dB) for λ ≥ 780 nm (except for fibers end caps).
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