Propagation loss evaluation of optical transmission/interconnect system with grating structure

In order to achieve the super-wideband and super-high density, the light multiplex wiring utilizing thin film waveguide with grating elements has attracted attentions. However, the optical transmission system equipped with such grating elements has a lot of parameters for the design and these parameters have complicated subordination relations. In this paper, we evaluate the transmission power loss of the optical transmission system equipped with the grating elements with considering diffraction phenomena by the numerical analysis simulation. The electromagnetic field numerical simulation of the transmission light was conducted by using the FDTD (finite difference time domain) method in 2D models. The purpose is to examine the influence of each parameter given to the performance, the transmission power loss of the device, and the extraction of a critical parameter. Consequently, the dependency of, wavelength, grating period, thickness of the grating layer, and refractive index, concerning the coupling efficiency of grating were clarified.