Efficient model of an incident beam for analyzing coupling efficiency of micro-optic devices for optical communication

Finite ray tracing has been utilized for the characteristic analysis and the optimal design of micro-optic devices. An incident beam, which enters into the devices through the input optical fiber, has to be represented as finite rays. In this paper, two kinds of modeling method such as the annular modeling and the cell modeling were introduced and compared with each other. It was found from the comparison that the later would be more accuracy and efficient than the former. Based on the cell modeling method, we analysed coupling efficiency of the thin-film filter type micro-optic device used as a wavelength division multiplexer in optical communication system.