Optical image storage techniques using the photorefractive effect are presented, where the random reference multiplexing scheme is introduced to the holographic recording process in order to increase the storage capacity. The common feature of our techniques is the use of a bundle of multimode fibers placed in the optical path of reference wave. This approach can automatically impose quasi-random patterns on the wavefront when the reference wave penetrates the fiber bundle. As a

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... le, experiments of recording holograms are performed with a LiNbO 3 crystal. The results show that the use of fiber bundle enables us to build a simple and compact optical setup with keeping the capacity of hologram multiplexing.