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The fiber is anisotropic crystals, the light beam of light incident upon the fiber is broken down into two beams of refracted light. This phenomenon is the optical birefringence, if the optical fiber for the ideal situation, refers to the cross-section without distortion, for a complete real round 更多：https://www.bmcx.com/ , and without stress in the core fiber bending phenomenon, when the birefringence beam is the same refractive index of the fiber axial transmission is exactly the same with isotropic crystal, then pmd = 0. But the practical application of the fiber is not an ideal situation to make the he11 two polarization mode can not be completely degenerate, resulting in the state of polarization instability due to various reasons.

Fiber is anisotropic crystals, a beam of light incident into the fiber is split into two beams of light refraction. This phenomenon is the double refraction of light, if the fiber is the ideal situation, is one whose cross-section distortion-free, full of real circles, and no stress in the fiber core 更多：https://www.bmcx.com/ , optical fiber itself is no bow, double refraction of the two beams of light in a refractive index of optical fiber axial transmission was unchanged, with isotropic Crystal with exactly the same, PMD=0. But in the practical application of the fibre is not an ideal situation, for a variety of reasons why the HE11 two polarization modes do not completely degenerate, resulting in unstable state of polarization.

Optical fiber is anisotropic crystal, light a beam of light in the incident to optical fiber is broken into two beams of refraction of light. This phenomenon is light birefringence, if the ideal situation for optical fiber, it is to point to the cross section no distortion, for complete real round, and fine within core no stress exists 更多：https://www.bmcx.com/ , optical fiber itself without bending phenomenon,Then birefringence of the two light beams in fiber axial transmission of refractive index are the same, and with isotropic crystal completely, then PMD = 0. But the actual application of optical fiber is not ideal situation, because all sorts of reasons that HE11 two polarization mode can't completely Jane and, produce the polarization state of flux.

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