| Summary: | 碩士 === 國立聯合大學 === 光電工程學系碩士班 === 98 === In this thesis we use plane wave expansion method to analyze some structure of index-guiding photonic crystal fiber. To improve polarization-maintaining effect and enhance the birefringence value in a fiber, we destroy the periodicity of a fiber structure deliberately. We investigate two kinds of polarization-maintaining photonic crystal fibers that can be realized, in order to study what influence does the change of the structure has to birefringence. Subsequently, we design a polarization-maintaining photonic crystal fiber structure. In our estimation, the fiber has a birefringence of about 10×10-3 at a wavelength of 1.55μm. Furthermore, it is easier to fabricate and easier to operate light coupling.
In order to pursue higher value of birefringence, we study and design a structure of polarization maintaining photonic crystal fiber based on liquid-filled technology. This structure considerably enhance the birefringence, the maximum value of birefringence can be up to 17×10-3, which is much higher than the birefringence of polarization-maintaining fiber in the present day. Finally, we restrict the wavelength of incident light in a specific range, then the polarization-maintaining photonic crystal fiber mentioned above can be regarded as a polarizer.
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