Definition of polarization-preserving fiber

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Photonics Dictionary

polarization-preserving fiber

Single-mode fiber that preserves the plane of polarization of the light launched into it as the beam propagates through its length. Also called polarization-maintaining fiber. The polarization is maintained by introducing asymmetry in the fiber structure, either in its shape (geometrical birefringence) or in its internal stresses (stress-induced birefringence). Because of this asymmetry, the two perpendicularly polarized modes transmitted by the fiber have different propagation constants, reducing cross-coupling between them as compared with conventional single-mode fiber.

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