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Noiseless intensity amplification of repetitive signals by coherent addition using the temporal Talbot effect

Author

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  • Reza Maram

    (Institut National de la Recherche Scientifique (INRS)—Energie, Matériaux et Télécommunications)

  • James Van Howe

    (Institut National de la Recherche Scientifique (INRS)—Energie, Matériaux et Télécommunications
    Augustana College)

  • Ming Li

    (Institut National de la Recherche Scientifique (INRS)—Energie, Matériaux et Télécommunications
    State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences)

  • José Azaña

    (Institut National de la Recherche Scientifique (INRS)—Energie, Matériaux et Télécommunications)

Abstract

Amplification of signal intensity is essential for initiating physical processes, diagnostics, sensing, communications and measurement. During traditional amplification, the signal is amplified by multiplying the signal carriers through an active gain process, requiring the use of an external power source. In addition, the signal is degraded by noise and distortions that typically accompany active gain processes. We show noiseless intensity amplification of repetitive optical pulse waveforms with gain from 2 to ~20 without using active gain. The proposed method uses a dispersion-induced temporal self-imaging (Talbot) effect to redistribute and coherently accumulate energy of the original repetitive waveforms into fewer replica waveforms. In addition, we show how our passive amplifier performs a real-time average of the wave-train to reduce its original noise fluctuation, as well as enhances the extinction ratio of pulses to stand above the noise floor. Our technique is applicable to repetitive waveforms in any spectral region or wave system.

Suggested Citation

  • Reza Maram & James Van Howe & Ming Li & José Azaña, 2014. "Noiseless intensity amplification of repetitive signals by coherent addition using the temporal Talbot effect," Nature Communications, Nature, vol. 5(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6163
    DOI: 10.1038/ncomms6163
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