Computer simulation of asymmetric microstructured optical fiber

Abstract

Many high birefringence microstructured optical fibers (MOFs) ate generated by introducing asymmetry with different modifications. Due to the deformations of MOF in transportation and usage, ellipticity is one of the most popular choices.

In this dissertation, a special glass MOF with asymmetric core refion and elliptical-hole cladding is studied and simulated with two simulation software tools. Subsequently, the results are compared which can verify the reliability of the study. With this unique structure of proposed MOF, the field distributions of the first two modes are generated and then the birefringence can be calculated. By doing simulation based on the finite difference (FD) method at THz region, it is found that the birefringence is optimized to 0.089. This value is several magnitudes higher than the ones of conventional MOFs and is beneficial for its properties.

Furthermore, additional researches based on this structure are conducted. In the original solid-core structure, the ellipticity of the air-holes are changed, and the impact of ellipticity as well as the asymmetry of the structure can be observed. In the late hollow-core structure, the core-size is changed, based on which the cladding mode of this MOF is confirmed. And the study about ellipticity and core size on this MOF will provide significant information for the following studies.