碩士
國立臺灣科技大學
光電工程研究所
103
We proposed a spectrum reshaping scheme for single-channel 25Gb/s transmission over 20-50km single mode fiber (SMF) by using a 10Gb/s direct modulation laser (DML) with ...insufficient modulation bandwidth. We compared the effects of two reshaping filters, Fabry-Perot (FP) Etalon and Gaussian shape tunable filter. Both simulation and experiments were carried out to investigate the effectiveness of this scheme. The reshaping filter could cause three effects. The first effect is to convert the frequency modulation (FM) to amplitude modulation (AM) and get a higher Extinction Ratio (ER). The second one is to induce an extra phase shift because of the nonlinear edge slope and reduce the intersymbol interference (ISI) caused by dispersion. The last one is to increase the modulation bandwidth, similar to the function of an equalizer.
We used the periodic spectral characteristic of an optical etalon to reshape four wavelength-channels simultaneously. Thus, we can realize a transmission of 100 Gb
碩士
國立臺中教育大學
教師專業碩士學位學程
103
Employing action research method, this study aimed to promote children’s literacy through integrating picture books into literacy activities. The participants of this study ...were the mix-aged Smile class in the affiliated preschool of Smile Elementary School. The data of this study were analyzed through observation, interviews, and document collection.
This study shows that when teachers read picture books with children, pointing to the words helps children foster the concept of books. The use of dialogic reading strategy provides children more opportunities for discussion. In addition, combining picture books with related activities promotes children’s interests in reading and writing, and also increases the frequency of doing literacy activities at the corner time. For teachers, designing related literacy activities can depend on children’s ability. Teachers can share books of similar topics with children as well as design a series of learning activities based on one book.
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