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pmd polarization mode dispersion (polarization mode dispersion), the uneven distribution of stress fiber in the manufacturing process there are core non-circularity, to withstand the pressure side, switch to fiber bending and button, these factors will cause the fiber birefringence. Light in the single-mode fiber transmission between the two mutually orthogonal linear polarization modes will form a transmission group velocity difference, resulting in the polarization mode dispersion. Meanwhile, the energy exchange between the two fiber polarization mode, which produce the mode coupling. Fiber is longer 更多：https://www.bmcx.com/ , due to the random mode of the polarization mode coupling is very sensitive to small fluctuations of temperature, environmental conditions, the light source wavelength.Therefore, mode coupling has a certain randomness, which determines the pmd is a statistic. However, the pmd statistical measurement of the distribution, mean fiber birefringence is related to the lower fiber pmd extremely environmental sensitivity, the key is to reduce the fiber birefringence.

PMD PMD (Polarization Mode Dispersion), because the fiber cores in the manufacture of ellipticity, non-uniform stress distribution, subjected to lateral pressure, bending of fiber and Niu Zhuan, these factors will cause birefringence of fiber. In single-mode fiber transmission, two mutually orthogonal linear polarization is formed between the transport group and the speed is poor, polarization mode dispersion. At the same time, because of the fiber in the energy exchange occurs between the two polarization modes 更多：https://www.bmcx.com/ , the mode coupling. The fibre is long, due to the random mode coupling on polarization die temperature, environment conditions, minor fluctuations are very sensitive to wavelengths of the light source,Mode coupled with some randomness, this defines the PMD is a statistic. But statistical measurement of PMD distribution suggests that its mean value and birefringence of fiber-related, reduces fiber PMD is sensitivity to the environment, the key is to reduce optical birefringence.

PMD namely Polarization Mode Dispersion (Polarization Mode Dispersion), optical fiber in the manufacturing process because there are core not roundness, uneven distribution of stress, and inherit side pressure, fiber bending and button to turn, these factors will cause the birefringence fiber. In light of single-mode optical fiber transmission,Two mutually orthogonal linear polarization mode will form the transmission between group velocity difference, produce the polarization mode dispersion. At the same time, because of the optical fiber of the two main polarization mode to happen between energy exchange 更多：https://www.bmcx.com/ , which produce mode coupling. In fiber is longer, because the polarization mode of temperature, coupled with the method.the environmental conditions,Light wavelengths of light waves are very sensitive, so model coupled with certain randomness, which decides the PMD is a statistic. But the statistics of the distribution of the measurement PMD shows that the mean and fiber birefringence relevant, reduce the optical fiber to the sensitivity of the PMD extremely environment, the key point is to reduce the birefringence fiber.

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