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Theoretical Analysis Of Dispersion Properties Of Photonic Crystal Fibers

Posted on:2008-01-19Degree:MasterType:Thesis
Country:ChinaCandidate:X T ZhaoFull Text:PDF
GTID:2178360212995260Subject:Circuits and Systems
Abstract/Summary:PDF Full Text Request
The dispersion properties of photonic crystal fibers are important field in the research of photonic crystal fibers. The dispersion properties of index guiding photonic crystal fibers are investigated theoretically in the present dissertation. The main results are summarized as follows.For the first time, the relation of normalize equivalent core radius (p/Λ) with normalized frequency (Λ/λ) and hole-to-pitch ratio (d/Λ) is obtained in the photonic crystal fiber. The illogical fixed value of p/Λin the fully vectorial effective index method is modified. We propose the improved fully vectorial effective index method (IFVEIM) accordingly. The modal properties computed with the IFVEIM, such as the effective index and the total dispersion, are closely matched to those of the multi-pole method as well as to experimental values, the error of the effective index has been reduced by two to three orders of magnitude.The dispersion of photonic crystal fibers is computed using IFVEIM, and the variety rule of dispersion with fiber structure is found. With the variety rule, we designed closing to zero and flattened dispersion photonic crystal fiber in the wavelength of 1.525~1.565μm, 1.28~1.65μm and near the wavelength of 0.8μm in Ti: sapphire femtosecond lasers. The characteristic of closing to zero and flattened dispersion is denoted in quantity by root-mean-square. For photonic crystal fibers with simple structure, narrow-band large negative dispersion photonic crystal fibers and broad-band dispersion-compensating photonic crystal fibers are designed. And we also have draw photonic crystal fibers similar to the structures we designed.The dispersion and mode property in a dual-concentric-core photonic crystal fiber, based on pure silica, are simulated by the multipole method. The variety rule of dispersion with the structure parameters of the fiber is found. Near wavelength of 1.55μm, we obtain narrow-band dispersion-compensating photonic crystal fiber with dispersion values of -23 000 ps/km/nm, and broad-band dispersion-compensating photonic crystal fiber with dispersion from -1 000 ps/km/nm to -2 500 ps/km/nm in 200 nm band and the kappa values near 300 nm, which matched well with standard single mode fiber. It can compensate the dispersion and dispersion slope of 100 times of its length of standard single mode fiber used for broadband communication.
Keywords/Search Tags:Photonic crystal fiber, Dual-concentric-core fiber, Chromatic dispersion, Flattened dispersion, Dispersion compensation, Effective index method, Multipole method
PDF Full Text Request
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