Abstract

We report a novel technique for storing digital optical data in coherent time-domain optical memory to circumvent the problem of coherent saturation. In this technique, the carrier frequency of a data stream to be stored is slowly chirped so its power is spread over the data bandwidth for maximum data storage. In a proof-of-concept experiment, a total of 500 bits of data were stored at a rate of 20 Mbits/s in a 45-MHz-wide channel within the inhomogeneous line of the 7F05D1 transition in Eu3+:Y2SiO5. The result suggests a minimum storage density of ~1.5 Gbits/cm3 for this transition. Issues related to the storage of frequency-chirped data, such as the optimum chirp width and the saturation owing to peak–sidelobe interference, are also discussed.

© 1993 Optical Society of America

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References

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1993 (2)

1992 (1)

1991 (3)

1989 (1)

1986 (1)

1984 (1)

G. V. Jacoby, R. Kostt, IEEE Trans. Magn. MAG-20, 709 (1984).
[CrossRef]

1982 (1)

1960 (1)

J. R. Klauder, A. C. Price, S. Darlington, W. J. Albersheim, Bell Syst. Tech. J. 39, 745 (1960).

Albersheim, W. J.

J. R. Klauder, A. C. Price, S. Darlington, W. J. Albersheim, Bell Syst. Tech. J. 39, 745 (1960).

Babbitt, W. R.

Bai, Y. S.

Darlington, S.

J. R. Klauder, A. C. Price, S. Darlington, W. J. Albersheim, Bell Syst. Tech. J. 39, 745 (1960).

Gauthier, D. J.

Huang, J.

Jacoby, G. V.

G. V. Jacoby, R. Kostt, IEEE Trans. Magn. MAG-20, 709 (1984).
[CrossRef]

Kachru, R.

Kim, M. K.

Klauder, J. R.

J. R. Klauder, A. C. Price, S. Darlington, W. J. Albersheim, Bell Syst. Tech. J. 39, 745 (1960).

Kostt, R.

G. V. Jacoby, R. Kostt, IEEE Trans. Magn. MAG-20, 709 (1984).
[CrossRef]

Mitsunaga, M.

Mossberg, T. W.

Price, A. C.

J. R. Klauder, A. C. Price, S. Darlington, W. J. Albersheim, Bell Syst. Tech. J. 39, 745 (1960).

Shen, X. A.

Uesugi, N.

Yano, R.

Zhang, J. M.

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Figures (4)

Fig. 1
Fig. 1

Fourier power spectra of (a) a single 50-ns rectangular pulse (dashed curve), a pulse train consisting of 100 such pulses separated by 100 ns (solid curve), and (b) the same pulse train frequency chirped at 1.0 MHz/μs.

Fig. 2
Fig. 2

Experimental setup for demonstrating frequency-chirped optical data storage in CTDOM, along with laser pulse sequence and laser frequency (f0) modulation. AOM, acousto-optic modulator; AO, acousto-optic; PMT, photomultiplier tube.

Fig. 3
Fig. 3

(a) Input and echo pulse sequence recorded at a data chirp rate of 0.36 MHz/μs. (b) Retrieved signal of (a) on an expanded time scale. (c) Same as in (b) but with no frequency chirp. (d) Same as in (b) but chirped at a rate of 0.44 MHz/μs (or a total chirp width of 11 MHz).

Fig. 4
Fig. 4

(a) First 8 μs of the input data corresponding to a (1, 7)-code-modulated binary ASCII sequence for CTDOM. (a′) Retrieved data corresponding to (a), (b) Last 8 μs of the input of the same data sequence, (b′) Retrieved data corresponding to (b). The entire data stream is 21 μs long, containing a total of 420 bits with 119 on bits.

Equations (1)

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E e ( t ) F 1 [ E w ( ν ) E d ( ν ) E r ( ν ) ] ,

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