Modeling and analysis of vibration effects on signal quality for angular multiplexed holographic data storage

Abstract

Practical optical system design taking into account environmental factors is highly desirable. However it is in general a time consuming process which requires a massive iterations of numerical simulations. This is also one of the bottle necks of optical design for angular multiplexed holographic data storage system. To develop a practical method to evaluate effect of vibrations on signal quality, three-dimensional vibration model is developed which enables evaluation of vibration effect on normalized intensity level by using a single statistical figure of merit. Such single figure of meritis adopted to design a robust and efficient write strategy. The write strategy is applicable for wide range of vibration waveforms to increase write data transfer rate. Also optimum optical system parameters for angular multiplexed and monocular optical system are identified while maximizing tolerances of vibrations by applying the developed method. We propose NA 0.54 and pixel pitch 6.9m which can improve capacity and data transfer rate to 119% and 110% respectively compared to NA 0.6 reference design while keeping vibration margin as nearly identical to that of the reference design.