Volume holographic data storage system using a beam pattern from

Details Volume holographic data storage system using a beam pattern from Volume holographic data storage system using a beam pattern from

1998-07-02

2000-05-02

Spyrou, Cassandra

Optical waveguides

With optical coupler

Particular coupling structure

385 43, 385 31, 359 34, G02B 626, G03H 100

Patent

active

060582324

ABSTRACT:
A volume holographic data storage(VHDS) system incorporates therein a tapered optical fiber for generating a speckle beam pattern from the tapered optical fiber for increasing the amount of holograms to be stored into a photorefractive crystal. The VHDS system includes a light source for generating a coherent light beam, a beam splitter for splitting the coherent light beam into a reference and a signal beams, a storage medium for storing the multiple holograms thereinto, a mirror for directing the signal beam to the storage medium, a coupler for coupling the reference beam to the tapered optical fiber, wherein one end of the tapered optical fiber has a tapered structure to give perturbation in the form of a speckle pattern to the reference beam from the tapered optical fiber and the reference beam containing the speckle pattern travels to the storage medium after being transmitted through the tapered structure, thereby the speckle pattern reference beam interfering with the signal beam in the storage medium.

REFERENCES:
patent: 5812724 (1998-09-01), Ohtsu et al.
Kang et al. "Volume Hologram scheme using optical fiber for spatial multiplexing", Optics Letters, May 1997, vol. 22, No. 10.
Ki-Hyun Kim et al., "Recording of Volume Hologram Using a Beam Pattern from Tapered Optical Fiber" IEEE Photonics Technology Letters, Dec., 1997, vol. 9, No. 12, pp. 1610-1612.

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