Orthogonal aperture multiplexing for multilayered waveguide holographic read-only memories.
A multilayered waveguide holographic read-only memory is a promising candidate for the next generation of optical data storage systems. We improved the data density of the memory by using a multiplexing method with a set of orthogonal optical masks. We multiplexed as many as nine images into one waveguide hologram, and all the observed images had negligible cross talk. This made it possible to achieve a ninefold increase in data density. We provide experimental results for both metallic and liquid-crystal masks.
Imai
Tadayuki
T
NTT Photonics Laboratories, Nippon Telegraph and Telephone Corporation, 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa Prefecture, 243-0198 Japan. tadayuki@aecl.ntt.co.jp
Kurihara
Takashi
T
Yagi
Shogo
S
Kurokawa
Yoshiaki
Y
Endo
Masahiro
M
Tanabe
Takaya
T