الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 85 |  |  |
| | | from | 85 | | |
Abstract
In this thesis, compact mode converter based on asymmetric dual core photonic crystal fiber (ADC-PCF) with a thermo-sensitive core is presented and numerically investigated. The right core of the DC-PCF is filled with Nematic liquid crystal (NLC) to control the coupling wavelength between the two cores of the reported structure. The modal analysis of the suggested design is investigated using full vectorial finite difference method to compute the losses and neff of the studied TM mode. In this investigation, the geometrical and material parameters of the proposed mode converter are studied to fulfill high wavelength selectivity with a compact device length. The proposed mode converter has a compact device length of 403.6 μm and λ = 1.3 μm and cross talk of -29.68 dB. In addition, the reported device is simulated under different temperature levels from 15°C to 45°C to show the thermal tunability. Therefore, the proposed design can be used efficiently in integrated photonic circuits. This thesis is organized as follows : Chapter 1 introduces the topic of photonics and the motivation and objective behind this work. Chapter (2) introduces PCFs, their benefits, uses, and distinguishing and new properties above traditional fibers. Furthermore, a brief overview of liquid crystals, their characteristics, and kinds is provided. Chapter (3) presents numerical techniques to the study of photonic crystal fiber with an emphasis upon the finite element method used to analyze our structure. Chapter (4) a compact tunable mode converter is designed based on asymmetric dual-core PCF (ADC-PCF). Finally, Chapter 5 concludes the thesis with a summary, and few suggestions for the future scopes of this work.