Abstract

We propose a novel approach to time-domain storage of serial optical data. In this approach, two identical impulse-equivalent sequences are used as write and read pulses to store and later retrieve optical information. These pulse sequences are both amplitude and phase modulated in such a way that their autocorrelations resemble, as closely as theoretically possible, the autocorrelation of a single large brief pulse to ensure faithful data retrieval. Such impulse-equivalent sequences are known to exist for all lengths, permitting the storage of large-bandwidth data. The advantages of this approach include modest laser power requirement, high signal fidelity, and encrypted recording.

© 1996 Optical Society of America

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References

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1995

1994

1992

1991

1990

1988

1986

1984

Y. S. Bai, W. R. Babbitt, N. W. Carlson, T. W. MossbergAppl. Phys. Lett. 45, 714 (1984).
[CrossRef]

1982

1972

M. H. AckroydIEEE Trans. Aerospace Electron. Syst. AES-8, 2 (1972).
[CrossRef]

1962

D. A. HuffmanIRE Trans. Inform. Theory IT-8, S10 (1962).
[CrossRef]

Ackroyd, M. H.

M. H. AckroydIEEE Trans. Aerospace Electron. Syst. AES-8, 2 (1972).
[CrossRef]

Babbitt, W. R.

Bai, Y. S.

X. A. Shen, Y. S. Bai, R. KachruOpt. Lett. 17, 1079 (1992); X. A. Shen, R. KachruOpt. Lett. 20, 2508 (1995).
[CrossRef] [PubMed]

Y. S. Bai, W. R. Babbitt, T. W. MossbergOpt. Lett. 11, 724 (1986).
[CrossRef] [PubMed]

Y. S. Bai, W. R. Babbitt, N. W. Carlson, T. W. MossbergAppl. Phys. Lett. 45, 714 (1984).
[CrossRef]

Y. S. Bai, R. Kachru“Coherent time-domain data storage with spread-spectrum data pulse,”U.S. patent5,369,665 (November29, 1994).

Carlson, N. W.

Y. S. Bai, W. R. Babbitt, N. W. Carlson, T. W. MossbergAppl. Phys. Lett. 45, 714 (1984).
[CrossRef]

Chiang, E.

Gauthier, D. J.

Huang, J.

Huestis, D. L.

Huffman, D. A.

D. A. HuffmanIRE Trans. Inform. Theory IT-8, S10 (1962).
[CrossRef]

Jefferson, C. M.

Kaarli, R.

Kachru, R.

Kim, M. K.

Kröll, S.

Lin, H.

Mitsunaga, M.

Mossberg, T. W.

Rebane, A.

Saari, P.

Shen, X. A.

Uesugi, N.

Wang, T.

Xu, E. Y.

Yano, R.

Zhang, J. M.

Zhu, M.

Appl. Phys. Lett.

Y. S. Bai, W. R. Babbitt, N. W. Carlson, T. W. MossbergAppl. Phys. Lett. 45, 714 (1984).
[CrossRef]

IEEE Trans. Aerospace Electron. Syst.

M. H. AckroydIEEE Trans. Aerospace Electron. Syst. AES-8, 2 (1972).
[CrossRef]

IRE Trans. Inform. Theory

D. A. HuffmanIRE Trans. Inform. Theory IT-8, S10 (1962).
[CrossRef]

J. Opt. Soc. Am. B

Opt. Lett.

Other

Y. S. Bai, R. Kachru“Coherent time-domain data storage with spread-spectrum data pulse,”U.S. patent5,369,665 (November29, 1994).

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Figures (3)

Fig. 1
Fig. 1

Autocorrelation of (a) a biphase encoded pulse of a length equal to 128 bits, (b) a frequency-chirped pulse with TΔf = 128, (c) a 128-bit real Huffman sequence, and (d) a 128-bit complex Huffman sequence. The insets in (c) and (d) display the corresponding codes plotted as t/τ.

Fig. 2
Fig. 2

Convolution of a rectangular pulse of a length equal to 2T with the pulses in (a) Fig. 1(a), (b) Fig. 1(b), and (c) Fig. 1(c).

Fig. 3
Fig. 3

Digital data storage with the use of Huffman codes: (a) data to be stored (only the first half of the data is shown for clarity); (b) echo output simulated with the use of the complex code [Fig. 1(d)] generated by a modulator having only 3-bit amplitude resolution; (c) echo output simulated with the use of mismatched code, where EW is the same real code used in Fig. 1(c) but the phases of six subpulses in ER are incorrectly coded.

Equations (1)

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E E ( t ) [ E R ( t ) E W ( t ) ] * E D ( t ) ,

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