| Photonic crystal fibers (PCF) have very large refractive index modulation for its flexible index profile character, which make it could be used in dispersion compensation degign. Dispersion compensating fiber with excellent dispersion characteristic based on PCF is an important research field of photonic crystal fiber.In this dissertation, the theories of dispersion compensation, degign of large negative dispersion fiber and application of dual-core PCF in high-speed communication system are explored.A dual-core PCF with its outer core composed of high refractive index medium is designed. At the coupling wavelength1.573μm, the structure has a large negative dispersion coefficient-5900ps/(nm·km) which is benefit to reducing the length of dispersion-compensating fiber and its causing loss.Besides, through changing the different parameters of this fiber, the variation of fiber dispersion is also analyzed and summarized. Basing on it, at the coupling wavelength1550nm a large effective mode area36.7μm2and negative dispersion coefficient-1800ps/(nm·km) PCF structure is designed to realize the application in dispersion compensation.A dynamic dual-core photonic crystal fiber for dispersion compensation is realized via temperature controlling because the tunable dispersion properties of the proposed DC-PCF can benefit from the artificially controllable refractive index of the filled polymer. When this refractive index is increased from1.4185to1.4190, the phase matching wavelength shifts from1.585μm to1.560μm and in this case the dispersion peak value of the curves does not change obviously and stays in the range from-100to-800ps/(nm·km), at the same time, the resulting dispersion curves not only contain C band but also have good special flat dispersion compensation type. |
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