dc.description.abstract | Abstract
DWDM filters have been widely used in fiber-communication system. In order to increase its reliability, the temperature effect to the optical stability of the DWDM filters will become more and more important. The TSCW(Temperature Shift of Central Wavelength) of 100GHz DWDM filters in international specification is less than 1pm/℃. The main subject of this study is to measure the five cavities of different thin film design, different type of substrate, and different coating material in order to choose the 100GHz DWDM filters that fit the commercial specification. From this study, we find that the size of substrate, thickness of thin film, type of substrate, and the chosen high refractive index material may influence the TSCW. The best value of TSCW is 0.418pm/℃ which coating materials are Nb2O5 and SiO2, the number of the thin film layers is 117, substrate is WMS02, and the size is 1.4mm×1.4mm×1.0mm. | en_US |