Optical Amplifier Investigation Using Solar Light as A Pumping Source

• Main Authors: Po-Hsiang Tsai, 蔡柏祥
• Other Authors: Shien-Kuei Liaw
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/3dgpcb

碩士 === 國立臺灣科技大學 === 光電工程研究所 === 107 === This thesis aims to develop a device that can directly transform sunlight into a single-mode fiber, and increase the light-receiving efficiency. We mainly divided the experiment into three parts. Firstly, we understand the optimal time for sun exposure and the best time for solar energy transformation in Taipei and Chennai based on the theoretical data and the data of actual weather. The second part is to use the Tracepro software to simulate the coupling light according to different coupling elements, and measure the effect of the lens and the gradient index lens coupling with fiber respectively. Finally, the combination of the lens and the large beam collimator used in the experiment increases the power density of the light source by 16570 times. By simulating the receiving efficiency of the system every day in the whole year is simulated, it is understood that the architecture can receive at least sunlight at an elevation angle of 40.6 degree. From the end of May to the middle of July, both power are above 0.6 mW. Next, with the sunlight of Taipei on July 11 as the light source, the light collection simulated in different weather conditions can receive the power of 0.7438 mW into the fiber at vacuum condition, 0.5619 mW in the sunny day, and 0.2158 mW in the partly cloudy weather. It can be calculated that the power of 1mW can increase at least 4.6 times in all the weather conditions. The last part is the actual experiment. The coupling effect of the solar simulator is discussed, and the power density increases to 552.4 times by using the large beam collimator auxiliary fiber and coupling energy. At the end of the paper, the lens group, the large beam collimator and the optical fiber are actually measured outdoors, under the influence of the structure and weather, the highest power received in the fiber with a receiving area of 0.01227 square meters is 4.315 mW, and the power density increases by 2276 times.