Waveguide Multilayer Optical Card Storage Mechanism And Key Technologies

The optical three-dimension memory is an important research field of data storage area. This paper studies the mechanisms and technologies of optical waveguide multilayer card (OWMC), which is based on the principles of waveguide multilayer storage.This paper introduces several feasible ways to fabricate the OWMC device. According to the procedure of "monolayer-recording and multilayer-bonding", we made five-layer optical cards, and observed their data reading performances. Based on reading method of side-coupling and page-reading, OWMC reading system is designed and some conditions are analyzed to meet the demands of OWMC components, including the sub-systems of optics, addressing, reading and signal processing.Because OWMC reads data via the light leakage of waveguide defects, it's very important issues to improve the leakage efficiency and optimize the parameters of card structure. According to the similarity between monolayer and grating structures, a simple 1-D waveguide-grating model is proposed to investigate the wave propagation and light leakage of OWMC. Our analysis is based on the transmission-line equation and perturbation approach. By using this method, we analyzed the effects of structure parameters on the OWMC performances, obtained the relations between the leakage efficiency and the refractive index, pit depth, aspect ratio and the space of signal tracks. It provides a basic analysis for the optimization of the optical waveguide storage device.