Abstract

A novel scheme for suppressing the multiple-access interference (MAI) in coherent time-addressed optical CDMA systems is proposed. This is based on a differential detection using the dual-control NOLM. The basic principle for MAI suppression is described. For experimental demonstration, two encoded channels are constructed and decoded. These decoded signals are sent to the dual-control NOLM and a high autocorrelation peak with suppressed MAI at the output of NOLM is observed. Signal-to-interference ratio is improved by 7 dB.

©2004 Optical Society of America

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References

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    [Crossref]
  2. J. A. Salehi, “Code division multiple-access techniques in optical fiber networks-Part I: Fundamental principles,” IEEE Trans. Commun. 37, 824–833 (1989).
    [Crossref]
  3. A. S. Holmes and R. R. A. Syms, “All-optical CDMA using “Quasi-prime” codes,” J. Lightwave Technol. 10, 279–286 (1992).
    [Crossref]
  4. Y. L. Chang and M. E. Marhic, “Fiber-optic ladder networks for inverse decoding coherent CDMA,” J. of Lightwave Technol. 10, 1952–1962 (1992).
    [Crossref]
  5. M. E. Marhic, “Coherent optical networks,” J. of Lightwave Technol. 11, 854–864 (1993).
    [Crossref]
  6. H. Sotobayashi, W. Chujo, and K.-I. Kitayama, “1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4OCDM × 40WDM × 40Gb/s) transmission experiment using optical hard thresholding,” IEEE Photon. Technol. Lett. 14, 555–557 (2002).
    [Crossref]
  7. N. Wada and K-I. Kitayama, “A 10 Gb/s optical code division multiplexing using 8-chip optical bipolar code and coherent detection,” J. of Lightwave Technol. 17, 1758–1765 (1999).
    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref]
  13. Mohammed N. Islam, Ultrafast Fiber Switching Devices and Systems (Cambridge University Press, New York, USA, 1992).
  14. S. Watanabe and S. Takeda, “All-optical noise suppression using two-stage highly-nonlinear fibre loop interferometers,” Electron. Lett. 36, 52–53 (2000).
    [Crossref]

2003 (1)

2002 (1)

H. Sotobayashi, W. Chujo, and K.-I. Kitayama, “1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4OCDM × 40WDM × 40Gb/s) transmission experiment using optical hard thresholding,” IEEE Photon. Technol. Lett. 14, 555–557 (2002).
[Crossref]

2000 (1)

S. Watanabe and S. Takeda, “All-optical noise suppression using two-stage highly-nonlinear fibre loop interferometers,” Electron. Lett. 36, 52–53 (2000).
[Crossref]

1999 (1)

N. Wada and K-I. Kitayama, “A 10 Gb/s optical code division multiplexing using 8-chip optical bipolar code and coherent detection,” J. of Lightwave Technol. 17, 1758–1765 (1999).
[Crossref]

1994 (1)

M. Jinno, “Effects of crosstalk and timing jitter on all-optical time-division demultiplexing using a nonlinear fiber sagnac interferometer switch,” IEEE J. Quantum Electron. 30, 2842–2853 (1994).
[Crossref]

1993 (1)

M. E. Marhic, “Coherent optical networks,” J. of Lightwave Technol. 11, 854–864 (1993).
[Crossref]

1992 (4)

R. A. Griffin, D. D. Sampson, and D. A. Jackson, “Demonstration of data transmission using coherent correlation to reconstruct a coded pulse sequence,” IEEE Photon. Technol. Lett. 4, 513–515 (1992).
[Crossref]

A. S. Holmes and R. R. A. Syms, “All-optical CDMA using “Quasi-prime” codes,” J. Lightwave Technol. 10, 279–286 (1992).
[Crossref]

Y. L. Chang and M. E. Marhic, “Fiber-optic ladder networks for inverse decoding coherent CDMA,” J. of Lightwave Technol. 10, 1952–1962 (1992).
[Crossref]

M. Jinno and T. Matsumoto, “Nonlinear sagnac interferometer switch and its applications,” IEEE J. of Quantum Electron. 28, 875–882 (1992).
[Crossref]

1990 (1)

1989 (1)

J. A. Salehi, “Code division multiple-access techniques in optical fiber networks-Part I: Fundamental principles,” IEEE Trans. Commun. 37, 824–833 (1989).
[Crossref]

1986 (1)

P. R. Prucnal, M. A. Santoro, and T. R. Fan, “Spread spectrum fiber-optic local area network using optical processing,” J. Lightwave Technol. 4, 547–554 (1986).
[Crossref]

Chang, Y. L.

Y. L. Chang and M. E. Marhic, “Fiber-optic ladder networks for inverse decoding coherent CDMA,” J. of Lightwave Technol. 10, 1952–1962 (1992).
[Crossref]

Chujo, W.

H. Sotobayashi, W. Chujo, and K.-I. Kitayama, “1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4OCDM × 40WDM × 40Gb/s) transmission experiment using optical hard thresholding,” IEEE Photon. Technol. Lett. 14, 555–557 (2002).
[Crossref]

Eom, T.

Fan, T. R.

P. R. Prucnal, M. A. Santoro, and T. R. Fan, “Spread spectrum fiber-optic local area network using optical processing,” J. Lightwave Technol. 4, 547–554 (1986).
[Crossref]

Griffin, R. A.

R. A. Griffin, D. D. Sampson, and D. A. Jackson, “Demonstration of data transmission using coherent correlation to reconstruct a coded pulse sequence,” IEEE Photon. Technol. Lett. 4, 513–515 (1992).
[Crossref]

Holmes, A. S.

A. S. Holmes and R. R. A. Syms, “All-optical CDMA using “Quasi-prime” codes,” J. Lightwave Technol. 10, 279–286 (1992).
[Crossref]

Islam, Mohammed N.

Mohammed N. Islam, Ultrafast Fiber Switching Devices and Systems (Cambridge University Press, New York, USA, 1992).

Jackson, D. A.

R. A. Griffin, D. D. Sampson, and D. A. Jackson, “Demonstration of data transmission using coherent correlation to reconstruct a coded pulse sequence,” IEEE Photon. Technol. Lett. 4, 513–515 (1992).
[Crossref]

D. D. Sampson and D. A. Jackson, “Coherent optical fiber communications system using all-optical correlation processing,” Opt. Lett. 15, 585–587 (1990).
[Crossref] [PubMed]

Jinno, M.

M. Jinno, “Effects of crosstalk and timing jitter on all-optical time-division demultiplexing using a nonlinear fiber sagnac interferometer switch,” IEEE J. Quantum Electron. 30, 2842–2853 (1994).
[Crossref]

M. Jinno and T. Matsumoto, “Nonlinear sagnac interferometer switch and its applications,” IEEE J. of Quantum Electron. 28, 875–882 (1992).
[Crossref]

Kim, S.

Kitayama, K.-I.

H. Sotobayashi, W. Chujo, and K.-I. Kitayama, “1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4OCDM × 40WDM × 40Gb/s) transmission experiment using optical hard thresholding,” IEEE Photon. Technol. Lett. 14, 555–557 (2002).
[Crossref]

Kitayama, K-I.

N. Wada and K-I. Kitayama, “A 10 Gb/s optical code division multiplexing using 8-chip optical bipolar code and coherent detection,” J. of Lightwave Technol. 17, 1758–1765 (1999).
[Crossref]

Lee, B. H.

Marhic, M. E.

M. E. Marhic, “Coherent optical networks,” J. of Lightwave Technol. 11, 854–864 (1993).
[Crossref]

Y. L. Chang and M. E. Marhic, “Fiber-optic ladder networks for inverse decoding coherent CDMA,” J. of Lightwave Technol. 10, 1952–1962 (1992).
[Crossref]

Matsumoto, T.

M. Jinno and T. Matsumoto, “Nonlinear sagnac interferometer switch and its applications,” IEEE J. of Quantum Electron. 28, 875–882 (1992).
[Crossref]

Park, C.

Prucnal, P. R.

P. R. Prucnal, M. A. Santoro, and T. R. Fan, “Spread spectrum fiber-optic local area network using optical processing,” J. Lightwave Technol. 4, 547–554 (1986).
[Crossref]

Salehi, J. A.

J. A. Salehi, “Code division multiple-access techniques in optical fiber networks-Part I: Fundamental principles,” IEEE Trans. Commun. 37, 824–833 (1989).
[Crossref]

Sampson, D. D.

R. A. Griffin, D. D. Sampson, and D. A. Jackson, “Demonstration of data transmission using coherent correlation to reconstruct a coded pulse sequence,” IEEE Photon. Technol. Lett. 4, 513–515 (1992).
[Crossref]

D. D. Sampson and D. A. Jackson, “Coherent optical fiber communications system using all-optical correlation processing,” Opt. Lett. 15, 585–587 (1990).
[Crossref] [PubMed]

Santoro, M. A.

P. R. Prucnal, M. A. Santoro, and T. R. Fan, “Spread spectrum fiber-optic local area network using optical processing,” J. Lightwave Technol. 4, 547–554 (1986).
[Crossref]

Sotobayashi, H.

H. Sotobayashi, W. Chujo, and K.-I. Kitayama, “1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4OCDM × 40WDM × 40Gb/s) transmission experiment using optical hard thresholding,” IEEE Photon. Technol. Lett. 14, 555–557 (2002).
[Crossref]

Syms, R. R. A.

A. S. Holmes and R. R. A. Syms, “All-optical CDMA using “Quasi-prime” codes,” J. Lightwave Technol. 10, 279–286 (1992).
[Crossref]

Takeda, S.

S. Watanabe and S. Takeda, “All-optical noise suppression using two-stage highly-nonlinear fibre loop interferometers,” Electron. Lett. 36, 52–53 (2000).
[Crossref]

Wada, N.

N. Wada and K-I. Kitayama, “A 10 Gb/s optical code division multiplexing using 8-chip optical bipolar code and coherent detection,” J. of Lightwave Technol. 17, 1758–1765 (1999).
[Crossref]

Watanabe, S.

S. Watanabe and S. Takeda, “All-optical noise suppression using two-stage highly-nonlinear fibre loop interferometers,” Electron. Lett. 36, 52–53 (2000).
[Crossref]

Electron. Lett. (1)

S. Watanabe and S. Takeda, “All-optical noise suppression using two-stage highly-nonlinear fibre loop interferometers,” Electron. Lett. 36, 52–53 (2000).
[Crossref]

IEEE J. of Quantum Electron. (1)

M. Jinno and T. Matsumoto, “Nonlinear sagnac interferometer switch and its applications,” IEEE J. of Quantum Electron. 28, 875–882 (1992).
[Crossref]

IEEE J. Quantum Electron. (1)

M. Jinno, “Effects of crosstalk and timing jitter on all-optical time-division demultiplexing using a nonlinear fiber sagnac interferometer switch,” IEEE J. Quantum Electron. 30, 2842–2853 (1994).
[Crossref]

IEEE Photon. Technol. Lett. (2)

H. Sotobayashi, W. Chujo, and K.-I. Kitayama, “1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4OCDM × 40WDM × 40Gb/s) transmission experiment using optical hard thresholding,” IEEE Photon. Technol. Lett. 14, 555–557 (2002).
[Crossref]

R. A. Griffin, D. D. Sampson, and D. A. Jackson, “Demonstration of data transmission using coherent correlation to reconstruct a coded pulse sequence,” IEEE Photon. Technol. Lett. 4, 513–515 (1992).
[Crossref]

IEEE Trans. Commun. (1)

J. A. Salehi, “Code division multiple-access techniques in optical fiber networks-Part I: Fundamental principles,” IEEE Trans. Commun. 37, 824–833 (1989).
[Crossref]

J. Lightwave Technol. (2)

A. S. Holmes and R. R. A. Syms, “All-optical CDMA using “Quasi-prime” codes,” J. Lightwave Technol. 10, 279–286 (1992).
[Crossref]

P. R. Prucnal, M. A. Santoro, and T. R. Fan, “Spread spectrum fiber-optic local area network using optical processing,” J. Lightwave Technol. 4, 547–554 (1986).
[Crossref]

J. of Lightwave Technol. (3)

N. Wada and K-I. Kitayama, “A 10 Gb/s optical code division multiplexing using 8-chip optical bipolar code and coherent detection,” J. of Lightwave Technol. 17, 1758–1765 (1999).
[Crossref]

Y. L. Chang and M. E. Marhic, “Fiber-optic ladder networks for inverse decoding coherent CDMA,” J. of Lightwave Technol. 10, 1952–1962 (1992).
[Crossref]

M. E. Marhic, “Coherent optical networks,” J. of Lightwave Technol. 11, 854–864 (1993).
[Crossref]

Opt. Express (1)

Opt. Lett. (1)

Other (1)

Mohammed N. Islam, Ultrafast Fiber Switching Devices and Systems (Cambridge University Press, New York, USA, 1992).

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Figures (10)

Fig. 1.
Fig. 1. Schematic of coherent time-addressed optical CDMA systems with ladder encoder/decoder.
Fig. 2.
Fig. 2. Timing view diagram. (a) Decoder output A; (b) Decoder output B; (c) After DC-NOLM (A-B).
Fig. 3.
Fig. 3. (a) Schematic illustration of DC-NOLM;. (b) Truth table of XOR logic gate.
Fig. 4.
Fig. 4. Experimental set-up. LD: laser diode, PC: polarization controller, OC: optical coupler, DET: photodetector and sampling oscilloscope, WDM: 1532/1552 nm wavelength-division multiplexer, DSF: dispersion-shifted fiber, ODL: variable optical delay line, OBF: optical bandpass filter, EDFA: erbium-doped fiber amplifier
Fig. 5.
Fig. 5. Spectra before (dotted line) and after (solid line) DC-NOLM.
Fig. 6.
Fig. 6. Temporal waveforms with the desired channel before (a), (b) and after (c) DC-NOLM.
Fig. 7.
Fig. 7. Temporal waveforms with the interfering channel before (a), (b) and after (c) DC-NOLM.
Fig. 8.
Fig. 8. Temporal waveforms with both channels before (a), (b) and after (c) DC-NOLM.
Fig. 9.
Fig. 9. SIR variation as a function of the relative time delay between two channels.
Fig.10.
Fig.10. SIR variation as a function of Pc . Insets show the waveforms when Pc = 120 mW, 220 mW, respectively.

Equations (2)

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ϕ ( t ) = π P ( t ) P π L eff ,
T out ( t ) = ( 1 cos 2 ( Δ ϕ ( t ) 2 ) ) .

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