Tunable true-time delay of a microwave photonic signal realized by cross gain modulation in a semiconductor waveguide

Weiqi Xue, Jesper Mørk

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    Abstract

    We experimentally demonstrate the realization of a tunable true-time delay for microwave signals by exploiting cross gain modulation among counter-propagating optical beams in a semiconductor optical amplifier. Broadband operation from ∼5 to ∼35 GHz is observed. The physical effect originates from the combination of carrier dynamics and propagation effects, and the experimental results are well accounted for by a numerical model. We find that, in contrast to the case of the co-propagating beams, the bandwidth is not limited by the lifetime of excited carriers. The trade-off between the magnitude of the true-time delay and the microwave bandwidth is discussed. © 2011 American Institute of Physics.
    Original languageEnglish
    JournalApplied Physics Letters
    Volume99
    Issue number23
    Pages (from-to)231102
    ISSN0003-6951
    DOIs
    Publication statusPublished - 2011

    Bibliographical note

    Copyright 2011 American Institute of Physics (AIP)

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