Coherent time-domain data storage with spread-spectrum data puls

Details Coherent time-domain data storage with spread-spectrum data puls Coherent time-domain data storage with spread-spectrum data puls

1993-07-13

1994-11-29

Barron, Jr., Gilberto

Pulse or digital communications

Repeaters

Testing

365119, G11C 1304

Patent

active

053696654

ABSTRACT:
A method and apparatus for coherent time-domain optical data storage utilizing a randomizing phase modulation to increase storage capacity. A laser (10) generates write. read, and data pulses which are applied to an acousto-optic modulator (11), which modulates the pulses according to a modulation signal received from a radio-frequency modulator (12), and the modulated pulses are applied to the storage medium (13). The data signal to be recorded on the storage medium is subjected to spread-spectrum modulation, and in particular to pseudo-random phase modulation. The RF-modulator (12) modulates the write and read pulses with a frequency-chirping modulation and modulates the data pulse with the spread-spectrum modulated data signal before applying the respective pulses to the storage medium. The result is that a significantly longer data signal may be effectively recorded on the optical storage medium for a given characteristic de-phasing time of the medium.

REFERENCES:
patent: 4101976 (1978-07-01), Castro et al.
patent: 4459682 (1984-07-01), Mossberg
patent: 5204770 (1993-04-01), Kachru et al.
Bai et al., "Real-Time Optical Waveform Convolver/Cross Correlator," Applied Physics Letters, vol. 45, No. 7, (Oct. 1984), pp. 714.
Mossberg, "Time-Domain Frequency Selective Optical Data Storage," Optics Letters, vol. 77, (1982), p. 77.
Zhang et al., "Use of Phase-Noisy Laser Fields in the Storage of Optical Pulse Shapes in Inhomogeneously Broadened Absorbers," Optics Letters, vol. 16, (1991), p. 103.

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