Abstract

Volumetric optical disks comprising multiple data layers have been proposed to multiply recording density. Owing to the presence of out-of-focus data layers, interlayer cross talk is induced in readout. An optical model was developed to study the readout process and the effect of interlayer cross talk on the readout of dual-layer read-only optical disks. Schemes to improve the readout characteristics by suppression of the interlayer cross talk were proposed. Experiments that agreed well with the simulation resulted.

© 1999 Optical Society of America

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References

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  1. P. G. Wohimut, F. D. Neu, “Three dimensional electro-optical retrieval system,” U.S. patent3,946,367 (3March1976).
  2. J. R. Wullert, P. J. Delfyett, “Multiwavelength, multilevel optical storage using dielectric mirrors,” IEEE Photonics Technol. Lett. 6, 1133–1135 (1994).
    [CrossRef]
  3. P. L. Holster, J. M. Wittkimper, “Multilayer information disc,” U.S. patent4,450,553 (22May1984).
  4. T. Kashiwagi, “Dual layer disk overview,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 11–13.
  5. W. I. Imaino, H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical data storage system with multiple write-once phase-change recording layers,” U.S. patent5,555,537 (10September1996).
  6. H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical disk data storage system with multiple write-once dye-based data layers,” U.S. patent5,627,817 (6May1997).
  7. K. Nishiuchi, H. Kitaura, N. Yamada, N. Akahira, “Write-once type dual-layer optical disk using Te-O-Pd phase-change films,” in Digest for Joint Conference of Magneto-Optical Recording International Symposium/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 56–57.
  8. J. M. Bruneau, B. Bechevet, C. Germain, “Optical design for a double DVD-RAM phase-change disc,” in Digest for Joint Conference of Magneto-Optical Recording/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 58–59.
  9. H. J. Rosen, K. A. Rubin, W. W. C. Tang, W. Imaino, “Multilayer optical recording (MORE),” in Optical Data Storage ’95, G. R. Knight, H. Ooki, Y.-S. Tyan, eds., Proc. SPIE2514, 14–19 (1995).
    [CrossRef]
  10. K. A. Rubin, H. J. Rosen, T. McDaniel, W. W.-C. Tang, “Volumetric magneto-optic storage on multiple recording surfaces,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 10.
  11. S. Homan, A. E. Willner, “High-capacity optical storage using multiple wavelengths, multiple layers and volume holograms,” Electron. Lett. 31, 621–623 (1995).
    [CrossRef]
  12. W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.
  13. K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
    [CrossRef]
  14. A. B. Marchant, Optical Recording: a Technical Overview (Addison-Wesley, Reading, Mass., 1990), Chap. 5, p. 106.
  15. A. Yariv, Optical Electronics (Saunders College Publishing, Philadelphia, 1991), Chap. 2, p. 50.
  16. H. A. Macleod, Thin-Film Optical Filters (McGraw-Hill, New York, 1990), Chap. 2, pp. 15, 32–39.
  17. E. Hecht, Optics (Addison-Wesley, Reading, Mass., 1987), Chap. 2, p. 22; Chap. 4, p. 487.
  18. W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
    [CrossRef]

1995 (1)

S. Homan, A. E. Willner, “High-capacity optical storage using multiple wavelengths, multiple layers and volume holograms,” Electron. Lett. 31, 621–623 (1995).
[CrossRef]

1994 (1)

J. R. Wullert, P. J. Delfyett, “Multiwavelength, multilevel optical storage using dielectric mirrors,” IEEE Photonics Technol. Lett. 6, 1133–1135 (1994).
[CrossRef]

Akahira, N.

K. Nishiuchi, H. Kitaura, N. Yamada, N. Akahira, “Write-once type dual-layer optical disk using Te-O-Pd phase-change films,” in Digest for Joint Conference of Magneto-Optical Recording International Symposium/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 56–57.

Bechevet, B.

J. M. Bruneau, B. Bechevet, C. Germain, “Optical design for a double DVD-RAM phase-change disc,” in Digest for Joint Conference of Magneto-Optical Recording/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 58–59.

Best, M. E.

W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
[CrossRef]

Bruneau, J. M.

J. M. Bruneau, B. Bechevet, C. Germain, “Optical design for a double DVD-RAM phase-change disc,” in Digest for Joint Conference of Magneto-Optical Recording/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 58–59.

Delfyett, P. J.

J. R. Wullert, P. J. Delfyett, “Multiwavelength, multilevel optical storage using dielectric mirrors,” IEEE Photonics Technol. Lett. 6, 1133–1135 (1994).
[CrossRef]

Fan, B.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Faris, S.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Germain, C.

J. M. Bruneau, B. Bechevet, C. Germain, “Optical design for a double DVD-RAM phase-change disc,” in Digest for Joint Conference of Magneto-Optical Recording/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 58–59.

Haag, J.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Hecht, E.

E. Hecht, Optics (Addison-Wesley, Reading, Mass., 1987), Chap. 2, p. 22; Chap. 4, p. 487.

Holster, P. L.

P. L. Holster, J. M. Wittkimper, “Multilayer information disc,” U.S. patent4,450,553 (22May1984).

Homan, S.

S. Homan, A. E. Willner, “High-capacity optical storage using multiple wavelengths, multiple layers and volume holograms,” Electron. Lett. 31, 621–623 (1995).
[CrossRef]

Imaino, W.

H. J. Rosen, K. A. Rubin, W. W. C. Tang, W. Imaino, “Multilayer optical recording (MORE),” in Optical Data Storage ’95, G. R. Knight, H. Ooki, Y.-S. Tyan, eds., Proc. SPIE2514, 14–19 (1995).
[CrossRef]

K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
[CrossRef]

Imaino, W. I.

W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
[CrossRef]

W. I. Imaino, H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical data storage system with multiple write-once phase-change recording layers,” U.S. patent5,555,537 (10September1996).

Kashiwagi, T.

T. Kashiwagi, “Dual layer disk overview,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 11–13.

Kitaura, H.

K. Nishiuchi, H. Kitaura, N. Yamada, N. Akahira, “Write-once type dual-layer optical disk using Te-O-Pd phase-change films,” in Digest for Joint Conference of Magneto-Optical Recording International Symposium/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 56–57.

Li, L.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Lu, Z.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Luo, H.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Macleod, H. A.

H. A. Macleod, Thin-Film Optical Filters (McGraw-Hill, New York, 1990), Chap. 2, pp. 15, 32–39.

Marchant, A. B.

A. B. Marchant, Optical Recording: a Technical Overview (Addison-Wesley, Reading, Mass., 1990), Chap. 5, p. 106.

McDaniel, T.

K. A. Rubin, H. J. Rosen, T. McDaniel, W. W.-C. Tang, “Volumetric magneto-optic storage on multiple recording surfaces,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 10.

Milster, T.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Neu, F. D.

P. G. Wohimut, F. D. Neu, “Three dimensional electro-optical retrieval system,” U.S. patent3,946,367 (3March1976).

Nishiuchi, K.

K. Nishiuchi, H. Kitaura, N. Yamada, N. Akahira, “Write-once type dual-layer optical disk using Te-O-Pd phase-change films,” in Digest for Joint Conference of Magneto-Optical Recording International Symposium/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 56–57.

Rosen, H. J.

K. A. Rubin, H. J. Rosen, T. McDaniel, W. W.-C. Tang, “Volumetric magneto-optic storage on multiple recording surfaces,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 10.

H. J. Rosen, K. A. Rubin, W. W. C. Tang, W. Imaino, “Multilayer optical recording (MORE),” in Optical Data Storage ’95, G. R. Knight, H. Ooki, Y.-S. Tyan, eds., Proc. SPIE2514, 14–19 (1995).
[CrossRef]

W. I. Imaino, H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical data storage system with multiple write-once phase-change recording layers,” U.S. patent5,555,537 (10September1996).

H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical disk data storage system with multiple write-once dye-based data layers,” U.S. patent5,627,817 (6May1997).

K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
[CrossRef]

W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
[CrossRef]

Rubin, K. A.

W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
[CrossRef]

K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
[CrossRef]

H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical disk data storage system with multiple write-once dye-based data layers,” U.S. patent5,627,817 (6May1997).

W. I. Imaino, H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical data storage system with multiple write-once phase-change recording layers,” U.S. patent5,555,537 (10September1996).

H. J. Rosen, K. A. Rubin, W. W. C. Tang, W. Imaino, “Multilayer optical recording (MORE),” in Optical Data Storage ’95, G. R. Knight, H. Ooki, Y.-S. Tyan, eds., Proc. SPIE2514, 14–19 (1995).
[CrossRef]

K. A. Rubin, H. J. Rosen, T. McDaniel, W. W.-C. Tang, “Volumetric magneto-optic storage on multiple recording surfaces,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 10.

Schlichting, W.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

Strand, T. C.

K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
[CrossRef]

W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
[CrossRef]

Tang, W. C.

K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
[CrossRef]

Tang, W. W. C.

H. J. Rosen, K. A. Rubin, W. W. C. Tang, W. Imaino, “Multilayer optical recording (MORE),” in Optical Data Storage ’95, G. R. Knight, H. Ooki, Y.-S. Tyan, eds., Proc. SPIE2514, 14–19 (1995).
[CrossRef]

Tang, W. W.-C.

K. A. Rubin, H. J. Rosen, T. McDaniel, W. W.-C. Tang, “Volumetric magneto-optic storage on multiple recording surfaces,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 10.

W. I. Imaino, H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical data storage system with multiple write-once phase-change recording layers,” U.S. patent5,555,537 (10September1996).

H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical disk data storage system with multiple write-once dye-based data layers,” U.S. patent5,627,817 (6May1997).

Willner, A. E.

S. Homan, A. E. Willner, “High-capacity optical storage using multiple wavelengths, multiple layers and volume holograms,” Electron. Lett. 31, 621–623 (1995).
[CrossRef]

Wittkimper, J. M.

P. L. Holster, J. M. Wittkimper, “Multilayer information disc,” U.S. patent4,450,553 (22May1984).

Wohimut, P. G.

P. G. Wohimut, F. D. Neu, “Three dimensional electro-optical retrieval system,” U.S. patent3,946,367 (3March1976).

Wullert, J. R.

J. R. Wullert, P. J. Delfyett, “Multiwavelength, multilevel optical storage using dielectric mirrors,” IEEE Photonics Technol. Lett. 6, 1133–1135 (1994).
[CrossRef]

Yamada, N.

K. Nishiuchi, H. Kitaura, N. Yamada, N. Akahira, “Write-once type dual-layer optical disk using Te-O-Pd phase-change films,” in Digest for Joint Conference of Magneto-Optical Recording International Symposium/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 56–57.

Yariv, A.

A. Yariv, Optical Electronics (Saunders College Publishing, Philadelphia, 1991), Chap. 2, p. 50.

Electron. Lett. (1)

S. Homan, A. E. Willner, “High-capacity optical storage using multiple wavelengths, multiple layers and volume holograms,” Electron. Lett. 31, 621–623 (1995).
[CrossRef]

IEEE Photonics Technol. Lett. (1)

J. R. Wullert, P. J. Delfyett, “Multiwavelength, multilevel optical storage using dielectric mirrors,” IEEE Photonics Technol. Lett. 6, 1133–1135 (1994).
[CrossRef]

Other (16)

P. L. Holster, J. M. Wittkimper, “Multilayer information disc,” U.S. patent4,450,553 (22May1984).

T. Kashiwagi, “Dual layer disk overview,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 11–13.

W. I. Imaino, H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical data storage system with multiple write-once phase-change recording layers,” U.S. patent5,555,537 (10September1996).

H. J. Rosen, K. A. Rubin, W. W.-C. Tang, “Optical disk data storage system with multiple write-once dye-based data layers,” U.S. patent5,627,817 (6May1997).

K. Nishiuchi, H. Kitaura, N. Yamada, N. Akahira, “Write-once type dual-layer optical disk using Te-O-Pd phase-change films,” in Digest for Joint Conference of Magneto-Optical Recording International Symposium/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 56–57.

J. M. Bruneau, B. Bechevet, C. Germain, “Optical design for a double DVD-RAM phase-change disc,” in Digest for Joint Conference of Magneto-Optical Recording/International Symposium on Optical Memory ’97 (Business Center for Academic Societies Japan, Tokyo, Japan, 1997), pp. 58–59.

H. J. Rosen, K. A. Rubin, W. W. C. Tang, W. Imaino, “Multilayer optical recording (MORE),” in Optical Data Storage ’95, G. R. Knight, H. Ooki, Y.-S. Tyan, eds., Proc. SPIE2514, 14–19 (1995).
[CrossRef]

K. A. Rubin, H. J. Rosen, T. McDaniel, W. W.-C. Tang, “Volumetric magneto-optic storage on multiple recording surfaces,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), p. 10.

W. Schlichting, S. Faris, B. Fan, J. Haag, Z. Lu, L. Li, T. Milster, H. Luo, “Recording and read-out of a cholesteric liquid crystal based multilayer disk,” in Joint International Symposium on Optical Memory and Optical Data Storage, Vol. 12 of 1996 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1996), pp. 230–232.

K. A. Rubin, H. J. Rosen, W. C. Tang, W. Imaino, T. C. Strand, “Multilevel volumetric optical storage,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 247–253 (1994).
[CrossRef]

A. B. Marchant, Optical Recording: a Technical Overview (Addison-Wesley, Reading, Mass., 1990), Chap. 5, p. 106.

A. Yariv, Optical Electronics (Saunders College Publishing, Philadelphia, 1991), Chap. 2, p. 50.

H. A. Macleod, Thin-Film Optical Filters (McGraw-Hill, New York, 1990), Chap. 2, pp. 15, 32–39.

E. Hecht, Optics (Addison-Wesley, Reading, Mass., 1987), Chap. 2, p. 22; Chap. 4, p. 487.

W. I. Imaino, H. J. Rosen, K. A. Rubin, T. C. Strand, M. E. Best, “Extending the compact disk format to high capacity for video applications,” in 1994 Topical Meeting on Optical Data Storage, D. K. Campbell, M. Chen, K. Ogawa, eds. Proc. SPIE2338, 254–259 (1994).
[CrossRef]

P. G. Wohimut, F. D. Neu, “Three dimensional electro-optical retrieval system,” U.S. patent3,946,367 (3March1976).

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Figures (8)

Fig. 1
Fig. 1

Laser beam focuses to read data on the totally reflective layer of a dual-layer read-only optical disk. Multiple data marks on the out-of-focus layer are irradiated by the enlarged spot and result in interlayer cross talk.

Fig. 2
Fig. 2

Interlayer cross talk simulated from the out-of-focus layer when the NA of the objective lens is 0.4 or 0.6. The x axis denotes the scanning time of the laser beam. The minimum signal amplitude (derived from a mark region) is set to be 0; the maximum amplitude (derived outside the mark region) is set to be 100%.

Fig. 3
Fig. 3

Interlayer cross talk induced in dual-layer optical disks when the spacer thickness is (a) 40 µm, and (b) 2 µm (approximately the depth of focus).

Fig. 4
Fig. 4

(a) Simulated rf signal and (b) power spectrum in reading a CD and a totally reflective layer of a dual-layer ROM disk with a 25-Å-thick semireflector, where the dotted–dashed curves denote the interlayer cross talk. The spacer thickness is 40 µm.

Fig. 5
Fig. 5

(a) rf signal (eye pattern) and (b) rf power spectrum measured in reading the totally reflective layer of the dual-layer optical disk with a 25-Å-thick semireflector. In (a) the dc offset is 1.2 V; the horizontal and the vertical scales are 0.5 µs/division and 50 mV/division, respectively.

Fig. 6
Fig. 6

dc and ac components and readout modulation of the rf signal simulated from the totally reflective layer of the dual-layer optical disk. The spacer thickness is 40 µm.

Fig. 7
Fig. 7

dc and ac components and readout modulation of the rf signal measured from the totally reflective layer of the dual-layer optical disk.

Fig. 8
Fig. 8

Decay factors of the rf signal and the interlayer cross talk in read mode 1 as a function of semireflector thickness.

Equations (3)

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R=η0B-Cη0B+Cη0B-Cη0B+C*, T=4η0 Reηmη0B+Cη0B+C*, A=4η0 ReBC*-ηmη0B+Cη0B+C*,
Nt= f(xt, y)*h(X(t)-xt, y)dxdy,
readout modulationACDC×100%,

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