Design and Fabrication of Phase-Sifted Long Period Fiber Gratings
碩士 === 國立交通大學 === 光電工程系所 === 93 === In this thesis, we investigate the design and fabrication of phase-shifted long-period fiber gratings (LPGs). To periodically modulate the refractive index of the fiber core, the fiber is sequentially irradiated point-by-point by a UV laser beam. The refractive in...
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| Format: | Others |
| Language: | en_US |
| Published: |
2005
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| Online Access: | http://ndltd.ncl.edu.tw/handle/35175834772606409320 |
| Summary: | 碩士 === 國立交通大學 === 光電工程系所 === 93 === In this thesis, we investigate the design and fabrication of phase-shifted long-period fiber gratings (LPGs). To periodically modulate the refractive index of the fiber core, the fiber is sequentially irradiated point-by-point by a UV laser beam. The refractive index change of fabricated long-period fiber gratings can be changed by adjusting the UV exposure time. Using the coupled-mode theory to analyze the measured data, we calibrate the relationship of the fiber core refractive index change with the wavelength as well as with the exposure time. With the calibration parameters, an Evolutionary Programming (EP) algorithm is then used to design a flat-band LPGs by optimizing the coupling coefficient distribution function. By controlling the UV exposure time and the phase shifts between each uniform LPGs, complex LPGs with advanced characteristics can be fabricated.
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