Abstract

We experimentally demonstrate what we believe to be a novel detection scheme for interfacing asynchronous optical code division multiple access (CDMA) signals with an electronic clock and data recovery system that operates only at the baseband bandwidth. This allows using a large optical bandwidth expansion factor in which the optical chip rate is much larger than the bandwidth of the optoelectronic receiver. The received optical CDMA signal is launched into a four-wave-mixing-based wavelength-aware all-optical front end that rejects multiaccess interference, followed by an amplitude-noise suppression stage comprised of a semiconductor optical amplifier. The clean signal is then converted into a non-return-to-zero-like signal by a baseband receiver. Using the proposed detection scheme, asynchronous transmission and detection of optical CDMA signals is implemented. With the novel detection scheme, the classic CDMA near–far problem is mitigated, and error-free detection is easily obtained.

© 2010 Optical Society of America

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References

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2009

2007

2006

P.R.Prucnal, ed., Optical Code Division Multiple Access: Fundamentals and Applications (Taylor & Francis, 2006).

2005

2004

2002

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

1987

M. A. Santoro and P. R. Prucnal, Proc. IEEE 75, 1336 (1987).
[CrossRef]

1966

Armstrong, J. A.

Belardi, W.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

Brès, C. S.

Bubnov, M. M.

Deng, Y.

Dianov, E. M.

Fok, M. P.

Glesk, I.

Gupta, G. C.

Hamanaka, T.

Huang, Y. K.

Ibsen, M.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

Kitayama, K.

Kobayashi, S.

Kravtsov, K.

Lee, J. H.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

Mashinsky, V. M.

Monro, T. M.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

Prucnal, P. R.

Richardson, D. J.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

Salehi, J. A.

Santoro, M. A.

M. A. Santoro and P. R. Prucnal, Proc. IEEE 75, 1336 (1987).
[CrossRef]

Sasaki, K.

Teh, P. C.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

Wada, N.

Wang, X.

Wang, Z.

P. R. Prucnal, M. P. Fok, K. Kravtsov, Z. Wang, and Y. Deng, 2009 IEEE/LEOS Summer Topical Meetings (IEEE, 2009), paper TuA1.1.

Yusoff, Z.

J. H. Lee, P. C. Teh, Z. Yusoff, M. Ibsen, W. Belardi, T. M. Monro, and D. J. Richardson, IEEE Photon. Technol. Lett. 14, 876 (2002).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Experimental illustration of the optical CDMA system with wavelength-aware and low-speed receiver design.

Fig. 2
Fig. 2

Eye diagrams of the decoded optical CDMA signal detected using 30 GHz photodetector (a) in asynchronized system with P M / P A = 0   dB , (b) in asynchronized system with P M / P A = 0   dB after MAI removal, (c) in synchronized system with P M / P A = 4   dB , and (d) in synchronized system with P M / P A = 4   dB after MAI removal.

Fig. 3
Fig. 3

Eye diagrams of the optical CDMA signal detected using 1.25 Gbits/s receiver. (a) Without wavelength-aware receiver and P M / P A = 0   dB , (b) without wavelength-aware receiver and P M / P A = 4   dB , (c) with wavelength-aware receiver for MAI removal and P M / P A = 0   dB , (d) with wavelength-aware receiver for MAI removal and P M / P A = 4   dB . Inset, after the CDR system.

Fig. 4
Fig. 4

BER measurement of the optical CDMA signal detected using 1.25 Gbits/s low-speed receiver. (a) Without using FWM wavelength-aware receiver. (b) Using FWM wavelength-aware receiver.

Fig. 5
Fig. 5

(a)–(d) Eye diagrams of the optical CDMA signal detected using 1.25 Gbits/s receiver when there are overlapping between MAI and autocorrelation peaks with P M / P A = 0   dB . (a) In asynchronized system, SOA is absent after MAI removal. (b) In asynchronized system, SOA is present after MAI removal. (c) In synchronized system, SOA is absent after MAI removal. (d) In asynchronized system, SOA is present after MAI removal. (e) BER measurement of optical CDMA signal without and with SOA for noise suppression.

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