Abstract

The enhancement of the encryption properties of chaotic signals generated by a semiconductor laser subject to optical feedback is numerically demonstrated by applying subcarrier modulation. The numerical analysis shows that the message can be very efficiently encrypted when the radio frequency carrier is within the frequency range where the chaos power density is maximized. Decoding performance is also numerically assessed considering both open- and closed-loop schemes at the receiver side. The impact of subcarrier modulation on system’s performance under the influence of parameter mismatch is highlighted.

© 2007 Optical Society of America

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References

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2005 (2)

A. Argyris, D. Syvridis, L. Larger, V. Annovazzi-Lodi, P. Colet, I. Fischer, J. Garcia-Ojalvo, C. R. Mirasso, L. Pesquera, and K. A. Shore, Nature 438, 343 (2005).
[CrossRef] [PubMed]

R. Vicente, J. Daudén, P. Colet, and R. Toral, IEEE J. Quantum Electron. 41, 541 (2005).
[CrossRef]

2004 (1)

N. Gastaud, S. Poinsot, L. Larger, J.-M. Merolla, M. Hanna, J.-P. Goedgebuer, and F. Malassenet, Electron. Lett. 40, 898 (2004).
[CrossRef]

2002 (3)

C. R. Mirasso, J. Mulet, and C. Masoller, IEEE Photon. Technol. Lett. 14, 456 (2002).
[CrossRef]

V. Annovazzi-Lodi, S. Merlo, M. Norgia, and A. Scirè, IEEE J. Quantum Electron. 38, 1171 (2002).
[CrossRef]

J. Ohtsubo, IEEE J. Quantum Electron. , 38, 1141 (2002).
[CrossRef]

1998 (2)

G. D. Van Wiggeren and R. Roy, Science , 279, 1198 (1998).
[CrossRef]

K. M. Short and A. T. Parker, Phys. Rev. E 58, 1159 (1998).
[CrossRef]

Electron. Lett. (1)

N. Gastaud, S. Poinsot, L. Larger, J.-M. Merolla, M. Hanna, J.-P. Goedgebuer, and F. Malassenet, Electron. Lett. 40, 898 (2004).
[CrossRef]

IEEE J. Quantum Electron. (3)

J. Ohtsubo, IEEE J. Quantum Electron. , 38, 1141 (2002).
[CrossRef]

R. Vicente, J. Daudén, P. Colet, and R. Toral, IEEE J. Quantum Electron. 41, 541 (2005).
[CrossRef]

V. Annovazzi-Lodi, S. Merlo, M. Norgia, and A. Scirè, IEEE J. Quantum Electron. 38, 1171 (2002).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

C. R. Mirasso, J. Mulet, and C. Masoller, IEEE Photon. Technol. Lett. 14, 456 (2002).
[CrossRef]

Nature (1)

A. Argyris, D. Syvridis, L. Larger, V. Annovazzi-Lodi, P. Colet, I. Fischer, J. Garcia-Ojalvo, C. R. Mirasso, L. Pesquera, and K. A. Shore, Nature 438, 343 (2005).
[CrossRef] [PubMed]

Phys. Rev. E (1)

K. M. Short and A. T. Parker, Phys. Rev. E 58, 1159 (1998).
[CrossRef]

Science (1)

G. D. Van Wiggeren and R. Roy, Science , 279, 1198 (1998).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

(a) SNR of the filtered chaotically encrypted message and h KS as a function of the injection current. (b) SNR in terms of message bit rate for three different bias current and feedback strength operating conditions.

Fig. 2
Fig. 2

Schematic of the chaotic transmitter and receiver blocks utilizing subcarrier modulation and demodulation, respectively. The receiver does not necessarily contain an external cavity.

Fig. 3
Fig. 3

(a) SNR of the filtered chaotically encrypted message and h KS as a function of the injection current for f SC = 3 GHz . The agreement between complexity and encryption efficiency is obvious. (b) Electrical spectrum of the digital message modulating the 3 GHz subcarrier tone with (black) and without (gray) chaotic encryption.

Fig. 4
Fig. 4

SNR of the decoded message and the filtered chaotically encrypted message as a function of the subcarrier frequency.

Fig. 5
Fig. 5

SNR of the decoded message under PM effect. For the open-loop case no PM was considered.

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