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Single-mode fiber is susceptible to external factors cause the light polarization state of instability, and said external birefringence. Many external factors, the expression of external birefringence can not be completely uniform. External factors caused by the fiber birefringence change reason is that external factors caused by the fiber anisotropy. Such as optical fiber into a cable or construction process may be bent, twisted, vibration and pressure and mechanical force, the randomness of these forces may cause the fiber to produce random birefringence. In addition 更多：https://www.bmcx.com/ , fiber may work in a strong electric field and strong magnetic field and temperature environment. Fiber in the external mechanical force,Will produce a photo-elastic effect; the role of the external magnetic field, will produce the Faraday effect; the role of the external electric field, will produce the Kerr effect. The total result of all these effects will cause the fiber to generate a new anisotropic, resulting in the generation of external birefringence.

Single-mode optical fiber under the influence of external factors causing the polarization State of light unstable is the use of external birefringent said. Due to many external factors, external expression of double refraction is also not completely unified. Causes of optical birefringence change induced by external factors, external factors causing optical anisotropy of the new. For example in the process of construction of fiber optic cabling or may be bent, twisted, vibration and mechanical effects such as compression, randomness of these forces may have a random birefringence fiber. In addition, fiber may be in strong electric fields 更多：https://www.bmcx.com/ , and work under the environment of strong magnetic fields and temperature changes. Optical fiber under external mechanical force,Photoelastic effect; under the effect of external magnetic field, Faraday effect; under the effect of external electric field, Kerr. The total effect of all these results, new anisotropy of the fiber, resulting in generation of external birefringent.

Single-mode optical fiber by external factors influence the cause light polarization is not stable, it is to use external birefringence said. Because many external factors, the expression of the external birefringence can not be completely unity. External causes of optical fiber birefringence characteristics the reason of its changes, external factors in optical fiber new anisotropic.Such as optical fiber cable or in the process of construction as possible, twist wring, by bending vibration and compression and mechanical force function, these forces the randomness of the optical fiber may produce randomly birefringence. In addition 更多：https://www.bmcx.com/ , optical fiber may be strong electric field and magnetic field and temperature change under the environment of the work. Optical fiber in the external mechanical forces,Will produce light elasticity effect; Under the action of outer magnetic field, can produce a Faraday effect; Outside under the action of the electric field, will produce the Kerr effect. All these effects of total results, can make optical fiber produce new anisotropic, lead to external birefringence production.

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