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Ellipticity of the single-mode fiber core may have waveguide birefringence, the fiber composition of the expansion coefficient of the material inconsistency may produce stress birefringence. As the core non-circularity degree increases, the single-mode fiber pmd an increasing trend, and fiber pmd internal factors is more consistent. But also found that is not core to the roundness of the corresponding fiber pmd on 更多：https://www.bmcx.com/ , indicating the presence of another factor of the production of optical fiber pmd stress birefringence due to thermal expansion coefficient of different fiber composition material inconsistent leaving the fiber core to the existence of asymmetric transverse stress , so that the fiber core birefringence.Therefore, as the fiber manufacturer from the fiber core roundness and residual stress of the fiber to begin to control the fiber pmd.

Dan Moguang of thin core elliptical waveguide birefringence may arise, composed of fiber stress birefringence material coefficient of expansion inconsistencies may arise. As the core layer does not increase, single-mode fiber PMD an increasing trend, and internal factors of fiber PMD is more consistent. But it also found that is not the core layer of fiber PMD 更多：https://www.bmcx.com/ , notes another factor of stress birefringence fiber PMD, inconsistent due to the thermal expansion coefficient of fiber composed of different materials and optical fiber core layer asymmetric lateral stress, so that the fiber core double refraction.As fibre manufacturers from the fiber core is not circular and optical internal residual stress control of fiber PMD.

Single-mode uv exposure.when core ellipse may produce waveguide birefringence, optical fiber materials coefficient of expansion of inconsistent stress may double refraction. As the core layer not roundness increases, PMD single-mode optical fiber has the tendency of increase, this and optical fiber PMD produce internal factors are identical.But it also found that is not the core layer fiber PMD corresponding gained great is big 更多：https://www.bmcx.com/ , production of optical fiber that PMD another factors that stress birefringence, due to the different thermal expansion coefficient of optical fiber materials do not agree and optical fiber core layer exists asymmetry lateral stress, so that the optical fiber core layer produce double refraction.So as a manufacturer of optical fiber optical fiber core layer should not roundness and optical fiber to control the residual stress of optical fiber PMD.

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