Three-Paddle Polarization Controller
The mechanical three-ring polarization control is based on the principle of Birefringence produced by optical fiber under external force. The three rings are equivalent to λ/4, λ/2 and λ/4 wave plates, respectively. The light waves passing through λ/4 wave plates are converted into linearly polarized light, and the polarization direction is adjusted by/2 wave plates. Finally, the polarization state of linearly polarized light is changed into arbitrary polarization state by/4 wave plates. The delay effect produced by the birefringence effect is mainly determined by the cladding radius of the fiber, the fiber ring radius and the wavelength of the light, the adjusted polarization state can cover the entire poincare sphere.
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