Laser-phase-fluctuation-insensitive offset-frequency-spaced two-tone optical coherent detection scheme and its transmission for radio-over-fiber systems

Toshiaki Kuri, Takahide Sakamoto, Tetsuya Kawanishi

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    Abstract

    We propose a new optical coherent detection scheme with a "two-tone" local light, which is also in principle insensitive to the laser phase fluctuation and is assisted by the digital signal processing technique for radio-over-fiber (RoF) systems. The main feature of our proposal is that the frequency separation of the two-tone local light is different from that of the RoF signal, which is called "offset-frequency-spaced" in this paper. First, we explain the principle of our new proposal and experimentally demonstrate the data recovery. Then, the influence of the frequency detuning between photo-detected modulated and unmodulated signals is discussed. Moreover, the transmission performance with an error vector magnitude (EVM) is evaluated for the optical coherent detection of a 10-Gbaud quadrature-phase-shift-keying RoF signal after a 20-km-long standard single-mode fiber transmission.

    Original languageEnglish
    Pages (from-to)24140-24151
    Number of pages12
    JournalOptics Express
    Volume23
    Issue number19
    DOIs
    Publication statusPublished - 2015

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    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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