Analysis Of The Splicing Loss And Polarization Properties Of The PMF

With many advantages such as high reliability, long lifetime, quick-reaction and wide dynamic range, Fiber Optic Gyro(FOG) has become mainstream instrument in the inertial technology field. This paper discusses some problems faced in the FOG engineering.As the actual engineering application, the light source used in FOG available is not ideal linear polarized light but partially polarized light. The most researches about FOG is based on linear polarized light, but the polarization state of the light propagating in polarization-maintaining optical fiber(PMF) have influence on the character of FOG. This paper has done some researches about the problem and completed the following work. A simplified model of partially polarized light is established. It is presented by two linear polarized lights with the vibration direction perpendicular to each other, the phase is unrelated and the amplitude is unequal. And some simplified models which are closer to the actual situation are described in detail. A study on the changes of polarization state and polarization degree of the partially polarized light transmits through the welding point of polarization-maintaining optical fiber(PMF). Based on simplified model of partially polarized light and adopting the Jones vector representation method, the effect on extinction ratio of PMF with misalignment of polarization axis is studied. The factors of splicing loss and a variety of errors range are summerized. The calculation method of splicing loss is presented. Adopting the model theory ,the splicing loss of the linear polarized light transmits through the welding point of PMF is analyzed which can used for the later analysis the splicing loss of the linear polarized light transmits through the welding point of PMF.