Abstract

We show that the system transfer function of magneto-optic data storage systems can be improved significantly by combination of optical filtering and electronic filtering. In our experiment, the relative high-frequency contrast improved from 10% to 40% after application of a combined optical and electronic filter. The carrier-to-noise ratio was slightly degraded at low frequencies but was improved by 2–3 dB at high frequencies. Measurements indicate that the combined system improves jitter by a factor of 3 at high frequencies.

© 1995 Optical Society of America

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References

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  1. T. D. Milster, C. H. Curtis, Appl. Opt. 29, 6272 (1992).
    [CrossRef]
  2. Y. Yamanaka, Y. Hirose, K. Kubota, Jpn. J. Appl. Phys. 28(Suppl. 3), 197 (1989).
    [CrossRef]
  3. H. Ando, T. Yokota, K. Tanoue, Jpn. J. Appl. Phys. 32, 5269 (1993).
    [CrossRef]
  4. T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
    [CrossRef]
  5. A. Marchant, Optical Recording (Addison-Wesley, Reading, Mass., 1990), Chap. 8, pp. 215–217.
  6. T. Tanabe, N. Amano, R. Arai, in Optical Data Storage, Vol. 10 of 1994 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1994), p. 132.
  7. A. Marchant, Optical Recording (Addison-Wesley, Reading, Mass., 1990), Chap. 9, p. 254.

1993 (2)

H. Ando, T. Yokota, K. Tanoue, Jpn. J. Appl. Phys. 32, 5269 (1993).
[CrossRef]

T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
[CrossRef]

1992 (1)

T. D. Milster, C. H. Curtis, Appl. Opt. 29, 6272 (1992).
[CrossRef]

1989 (1)

Y. Yamanaka, Y. Hirose, K. Kubota, Jpn. J. Appl. Phys. 28(Suppl. 3), 197 (1989).
[CrossRef]

Amano, N.

T. Tanabe, N. Amano, R. Arai, in Optical Data Storage, Vol. 10 of 1994 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1994), p. 132.

Ando, H.

H. Ando, T. Yokota, K. Tanoue, Jpn. J. Appl. Phys. 32, 5269 (1993).
[CrossRef]

Arai, R.

T. Tanabe, N. Amano, R. Arai, in Optical Data Storage, Vol. 10 of 1994 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1994), p. 132.

Curtis, C. H.

T. D. Milster, C. H. Curtis, Appl. Opt. 29, 6272 (1992).
[CrossRef]

Hirose, Y.

Y. Yamanaka, Y. Hirose, K. Kubota, Jpn. J. Appl. Phys. 28(Suppl. 3), 197 (1989).
[CrossRef]

Kubota, K.

Y. Yamanaka, Y. Hirose, K. Kubota, Jpn. J. Appl. Phys. 28(Suppl. 3), 197 (1989).
[CrossRef]

Li, W.

T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
[CrossRef]

Marchant, A.

A. Marchant, Optical Recording (Addison-Wesley, Reading, Mass., 1990), Chap. 9, p. 254.

A. Marchant, Optical Recording (Addison-Wesley, Reading, Mass., 1990), Chap. 8, pp. 215–217.

Milster, T. D.

T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
[CrossRef]

T. D. Milster, C. H. Curtis, Appl. Opt. 29, 6272 (1992).
[CrossRef]

Tanabe, T.

T. Tanabe, N. Amano, R. Arai, in Optical Data Storage, Vol. 10 of 1994 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1994), p. 132.

Tanoue, K.

H. Ando, T. Yokota, K. Tanoue, Jpn. J. Appl. Phys. 32, 5269 (1993).
[CrossRef]

Walker, E.

T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
[CrossRef]

Wang, M. S.

T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
[CrossRef]

Yamanaka, Y.

Y. Yamanaka, Y. Hirose, K. Kubota, Jpn. J. Appl. Phys. 28(Suppl. 3), 197 (1989).
[CrossRef]

Yokota, T.

H. Ando, T. Yokota, K. Tanoue, Jpn. J. Appl. Phys. 32, 5269 (1993).
[CrossRef]

Appl. Opt. (1)

T. D. Milster, C. H. Curtis, Appl. Opt. 29, 6272 (1992).
[CrossRef]

Jpn. J. Appl. Phys. (3)

Y. Yamanaka, Y. Hirose, K. Kubota, Jpn. J. Appl. Phys. 28(Suppl. 3), 197 (1989).
[CrossRef]

H. Ando, T. Yokota, K. Tanoue, Jpn. J. Appl. Phys. 32, 5269 (1993).
[CrossRef]

T. D. Milster, M. S. Wang, W. Li, E. Walker, Jpn. J. Appl. Phys. 32, 5397 (1993).
[CrossRef]

Other (3)

A. Marchant, Optical Recording (Addison-Wesley, Reading, Mass., 1990), Chap. 8, pp. 215–217.

T. Tanabe, N. Amano, R. Arai, in Optical Data Storage, Vol. 10 of 1994 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1994), p. 132.

A. Marchant, Optical Recording (Addison-Wesley, Reading, Mass., 1990), Chap. 9, p. 254.

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Figures (6)

Fig. 1
Fig. 1

Magneto-optic data storage device with a relay system to image the stop of the optical system into the data path at the aperture plane. The aperture plane is where optical filters are placed.

Fig. 2
Fig. 2

Readback waveforms. A simple threshold level is indicated by the straight line through the waveforms. (a) Ideal response together with noise-free response for an unfiltered system, (b) ideal response together with a noise-free response for an equalized system, (c) ideal response together with noisy response for an equalized system.

Fig. 3
Fig. 3

Overlap of ±1 diffracted orders with the zero order at the stop for (a) low frequency and (b) high frequency.

Fig. 4
Fig. 4

System transfer functions for the unfiltered system (none), electronic filtering only (E), optical filtering only (O), and a combination of optical and electronic filtering (O & E).

Fig. 5
Fig. 5

CNR’s for the unfiltered system (none), electronic filtering only (E), optical filtering only (O), and a combination of optical and electronic filtering (O & E). The bandwidth of the spectrum analyzer is 30 kHz.

Fig. 6
Fig. 6

System jitter for the unfiltered system (none), electronic filtering only (e), optical filtering only (O), and a combination of optical and electronic filtering (O & E).

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