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The intrinsic polarization dependence of an all-fiber tunable wavelength filter based on polarization coupling by torsional acoustic wave is eliminated by employing a fiber loop configuration. In the fiber loop, two orthogonal polarizations split from input light propagate the single acousto-optic interaction region in opposite directions before being recombined to produce a polarization-independent...
The splitting and the shift of resonance peak in an elliptical-core two-mode fiber acousto-optic tunable filter caused by the twist perturbation are described.
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