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US 8,605,561 B2Granted
Method and system for re-writing with a holographic storage medium
AssigneeAccess Optical Networks, Inc.
InventorsGlenn A. Gladney, Marvin Hutt, Milton Soto
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Abstract
A method and device for re-writing data on a holographic storage device is disclosed. First and second electro-optic modulators may phase shift the reference and data beams used to store data on the photorefractive crystal. When the reference beam is shifted 180° out of phase with respect to the data beam, the photorefractive crystal is erased.
Claims20
A holographic storage system comprising:
- a reference beam;
- a data beam;
- a photorefractive crystal for storing and retrieving a plurality of pages;
- a first electro-optic modulator for phase-shifting the data beam;
- a second electro-optic modulator for phase-shifting the reference beam;
- and wherein
- wherein a half wave voltage is applied to the first electro-optic modulator and the second electro-optic modulator for enabling writing to the photorefractive crystal.
4 more elements
A method for re-writing in a holographic storage system comprising:
- providing a reference beam and a data beam;
- writing to a photorefractive crystal, wherein writing occurs when the phases of the reference beam and the data beam are the same and occurs by applying a half wave voltage to a first electro-optic modulator;
- and applying a half wave voltage to a second electro-optic modulator;
- erasing the photorefractive crystal, wherein erasing occurs when the phase of the reference beam is 180° shifted with respect to the data beam;
- and
- re-writing to the photorefractive crystal, wherein re-writing occurs when the phases of the reference beam and the data beam are the same.
3 more elements
A holographic storage system comprising:
- a laser for generating an original beam;
- a beamsplitter for splitting the original beam;
- a reference beam formed from the original beam by the beamsplitter;
- a data beam formed from the original beam by the beamsplitter;
- a digital micro-mirror device for reflecting the data beam;
- a photorefractive crystal for storing and retrieving a plurality of pages;
- a first electro-optic modulator for phase-shifting the data beam;
- and
- a second electro-optic modulator for phase-shifting the reference beam and a camera for reading out the plurality of pages.
6 more elements
Dependencies are inferred from the claim text.