Abstract

A technique is proposed and experimentally demonstrated that achieves simultaneous optical pattern waveform storage and programmable time delay for continuous real-time signal processing by use of optical coherent transient technology. We achieve variable-time-delay and broadband signal processing by frequency shifting of two chirped programming pulses, the chirp rate of one being twice that of the other, without using brief reference pulses and without changing the timing of the programming sequence. We demonstrate the technique experimentally in Tm3+:YAG at 5 K for 40-MHz chirps by performing temporal signal convolution with true-time delays that vary over a 250-ns range.

© 1999 Optical Society of America

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References

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1999 (1)

1996 (2)

1994 (1)

1993 (1)

1992 (1)

1991 (1)

1985 (1)

M. Mitsunaga and R. G. Brewer, Phys. Rev. A 32, 1605 (1985).
[CrossRef] [PubMed]

1984 (2)

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

Y. S. Bai and T. W. Mossberg, Appl. Phys. Lett. 45, 1269 (1984); Opt. Lett. 11, 30 (1986).
[CrossRef]

1982 (1)

Babbitt, W. R.

Bai, Y. S.

X. A. Shen, Y. S. Bai, and R. Kachru, Opt. Lett. 17, 1079 (1992).
[CrossRef] [PubMed]

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

Y. S. Bai and T. W. Mossberg, Appl. Phys. Lett. 45, 1269 (1984); Opt. Lett. 11, 30 (1986).
[CrossRef]

Bell, J. A.

Brewer, R. G.

M. Mitsunaga and R. G. Brewer, Phys. Rev. A 32, 1605 (1985).
[CrossRef] [PubMed]

Carlson, N. W.

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

Kachru, R.

Macfarlane, R. M.

Merkel, K. D.

Mitsunaga, M.

Mossberg, T. W.

Y. S. Bai and T. W. Mossberg, Appl. Phys. Lett. 45, 1269 (1984); Opt. Lett. 11, 30 (1986).
[CrossRef]

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

T. W. Mossberg, Opt. Lett. 7, 77 (1982).
[CrossRef] [PubMed]

Shen, X. A.

Stearns, S. D.

B. Widrow and S. D. Stearns, Adaptive Signal Processing (Prentice-Hall, Englewood Cliffs, N.J., 1985).

Uesugi, N.

Widrow, B.

B. Widrow and S. D. Stearns, Adaptive Signal Processing (Prentice-Hall, Englewood Cliffs, N.J., 1985).

Yano, R.

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Figures (2)

Fig. 1
Fig. 1

Four-pulse input sequence to achieve convolution and variable time delay by application of two frequency chirps, a pattern and a data waveform. Vertical axes, electric field amplitude of all pulses and also frequencies of chirped pulses (bold dashed lines). In (b), both starting frequencies of the chirps are identical, causing a coherence at tC (intersection of the dotted lines). In (a) [(c)] the coherence caused by the two chirps occurs later [earlier] because of frequency shifting. The net result is to vary the time delay stored along with the pattern waveform, τttd=tP-tC, without changing the timing of the input sequence. In all three cases the signal ESτ (not to scale) is the convolution of the pattern and data waveforms emitted after the appropriate delay.

Fig. 2
Fig. 2

Experimental output data showing variable time delay and signal processing by frequency tuning of the chirped pulses. With reference to the data waveform (left), the time delay of the emitted signal 0.751.0 µs varies with the offsets of the chirp frequencies δνSBA. The 11 peaks are the detected intensity of the emitted signals representing the autocorrelation of the code; in addition, two other signals are shown, at δνSBA=±5 MHz, representing the autoconvolution of the code.

Equations (1)

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ESt-tS-ηS-E1*ΩE2ΩE3Ω×expiΩt-tS-ηSdΩ,

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