Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2004-09-30
2009-08-04
Tran, Thang V (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C235S454000, C385S129000
Reexamination Certificate
active
07570567
ABSTRACT:
An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
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Imai Tadayuki
Kozawaguchi Haruki
Ono Michio
Yagi Shougo
Yamazaki Hiroki
Nippon Telegraph and Telephone
Nixon & Peabody LLP
Tran Thang V
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