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Study On Properties And Measurement Techniques Of Photonic Crystal Fiber Dispersion

Posted on:2006-05-28Degree:MasterType:Thesis
Country:ChinaCandidate:Z H WangFull Text:PDF
GTID:2178360182475097Subject:Physical Electronics
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Photonic crystal fibers (PCFs), also referred to as holey fibers (HFs) ormicrostructured optical fibers (MOFs), are the generic term for a new class of allsilica optical fibers whose cladding typically comprises a hexagonal array of air holesrunning along the entire length. Since the first photonic crystal fiber was fabricated in1996, photonic crystal fibers have attracted considerable interest. These fibers arecharacterized by wavelength-scale air holes running along the fiber length in thecladding region, which have resulted in some unusual properties unattainable withconventional optical fibers, such as anomalous dispersion at visible wavelengths,endlessly single-mode guidance, high birefringence, and high nonlinearity. Due tothese properties, photonic crystal fibers have great potential in many fields oftechnology. Several dispersion properties and measurement techniques of photoniccrystal fiber dispersion are studied in this dissertation. The contents are as follows.1,Chapter one detailedly presents an introduction to the concept, classifications,fundamentals, fabrication technique, characteristics of, and advances in photoniccrystal fibers. Prospect of its development is given in the end.2,The numerical methods using to investigate PCF, especially the fully vectorialeffective index method are studied in chapter two. Analytical method is accuratelyexploited to calculate the effective index of the fundamental space filling mode(FSM).The fundamental space filling mode (FSM) of photonic crystal fibers can bedesignated HE1 1 mode following conventional mode classification. We alsodiscussed the concept of the modified fully vectorial effective index method in the endof the chapter.3,The total dispersion of photonic crystal fibers is obtained by summing up materialdispersion and waveguide dispersion. Using the normalized property of waveguidedispersion we designed the photonic crystal fibers with broadband ultra-flattenednormal,anomalous, and nearly zero dispersion property around the operatingwavelength of the widely used Ti: sapphire femtosecond lasers -800 nm and thetelecommunication window -1.55μm by the modified full vectorial effective indexmethod in chapter three.4,The foundational theories of fiber dispersion measurement are concluded in the firstpart of chapter four. Pulse-delay method and white-light interferometry technique areinvestigated. Considering the present condition of our laboratory, we design a noveltechnique which utilizes supercontinuum generation from photonic crystal fiber byusing femtosecond laser pulses and set up the experimental devices.5,In the last chapter, a summarization of our work and a prospect of photonic crystalfiber are presented.
Keywords/Search Tags:Photonic crystal fibers, Holey fibers, Microstructured optical fibers, Dispersion, Flattened dispersion, Modified fully vectorial effective index method, Dispersion measurement, Supercontinuum
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