| Research Abstract |
The results of this research are as follows :
1.An analysis method based on a full-vectorial finite element method was developed for design and modeling of photonic crystal fibers, the single-mode wavelength range, chromatic dispersion, mode area, mode-field diameter, beam divergence, confinement loss, bending loss, splice loss, and polarization mode dispersion were investigated. A method of real-model simulation was also developed for characterizing transmission properties of fabricated fibers.
2.In order to control the dispersion and the dispersion slope of holey fibers, a new controlling technique of chromatic dispersion was developed, and the relationship among the wavelength dispersion, confinement loss, and effective area was clarified. Fiber-based optical devices based on a multi-core holey fiber such as directional coupler, wavelength filter, and polarization splitter were newly constructed, and the fiber parameters such as lattice constant, hole diameter, and core separation were optimized.
3.The dispersion and leakage properties for the recently reported low-loss photonic band-gap fiber were studied in detail and it was found that the surface modes have a strong impact on these properties. From our research results, it was confirmed that when surface modes are present it is very likely they strongly modify the dispersion, leakage loss, and scattering loss of the bare air-core modes.
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