In any ordinary fiber, tiny imperfections are causing random changes to the polarity of light propagating through the fiber. For some applications, where maintaining the light’s polarization is key, a polarisation maintaining fiber (PMF or PM fiber) is used. In most versions of this single-mode speciality fiber, tension rods are integrated into the fiber’s cladding on opposite sides of the core, inducing a strong but tightly controlled birefringence. If linearly polarized light is properly launched into a PM fiber, it maintains its linear polarization during propagation.
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