Study On Dispersion Properties Of Microstructure Fibers

The dispersion properties of microstructures fiber (MSF) are studied in thispaper including numerical simulation and experimental measurement. Threekinds of dispersion properties of photonic crystal fiber (PCF) are introduced.The methods of experimental measurement for PCF are summed up. Thescheme to measure the MSFs is proposed. We have set up the experimentalarrangement and measured two kinds of MSFs which are fabricated by us.Based on the back-scattering phenomenon of MSF, we validate that there islocalization phenomenon in MSF. Following are the main works of thisdissertation:The dispersion properties and measurement of traditional communicationfiber are introduced. The three dispersion properties of PCF are studiedincluding short-wave zero dispersion, nearly zero ultra-flatten dispersion andhigh negative dispersion. The methods to measure the dispersion parameters aresummarized including spectral modulation method, interferometry and femto-second pulse delay method.Using of the software package basing on the multipole method we havesimulated and analyzed the dispersion properties of PCF. It is founded that thedispersion properties of PCF can be modulated effectively by changing the pitchΛ and the air hole size d in PCF's cladding. The law of the dispersion propertychange with the PCF's structure is also obtained.We have proposed the scheme to measure the MSF's dispersion parameterbased on the Michelson interferometer and set up the experimental arrangement.By measuring two kinds of MSF which are fabricated by us, we get theinterference patterns. Through the Fourier transform, we obtain the groupvelocity dispersion β2 and dispersion parameter D of MSFs.The relevant back-scattering phenomenon of MSFs is experimental studied.On the range of visible light, we get the relevant spectrum and then get therelevant angle of back scattering. It is validated that there is localizationphenomenon in MSFs.