الفهرس 
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Abstract
This thesis presents The performance of high-tunable polarization rotator (PR) based on soft glass liquid crystal (SGLC) photonic crystal fiber is reported. The tunability of the proposed PR results from the change of the optical properties of the SGLC with the temperature and external electric field. The influence of the different structure geometrical parameters, rotation angle of the director of the SGLC, temperature and operating wavelength on the PR performance is investigated. The numerical results reveal that the suggested PR can provide a strong polarization conversion ratio of 93.84% with a device length of 336.73 μm. It is expected that over the 1.3–1.75 μm wavelength range, polarization conversion would be more than 92%. The simulation results are evaluated using the full-vectorial finite-difference method and confirmed by the full-vectorial finite-difference beam-propagation method. In addition, a rigorous analysis of polarisation conversion in a novel design of cascaded bent silica photonic crystal fibre is proposed using full vectorial finite difference method as well as full vectorial finite difference beam propagation method. The influence of different structural geometrical parameters on the polarisation rotator performance is investigated. The numerical results reveal that by a careful adjustment of the structural geometrical parameters and bending radius, nearly a 100 % polarisation conversion ratio with nine sections only and low bending losses can be achieved.