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Optical vector network analyzer based on double-sideband modulation.

Wen Jun, Ling Wang, Chengwu Yang

    Optics Letters
    |November 1, 2017
    PubMed
    Summary

    This study introduces a novel optical vector network analyzer (OVNA) using double-sideband (DSB) modulation. This advanced OVNA offers doubled measurement range and improved accuracy for optical devices.

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    Area of Science:

    • Photonics and Optical Engineering
    • Electrical and Computer Engineering
    • Metrology and Measurement Science

    Background:

    • Conventional optical vector network analyzers (OVNA) often use single-sideband (SSB) modulation, limiting measurement range and accuracy.
    • Measuring devices with bandpass responses presents a significant challenge for existing SSB-based OVNA systems.

    Purpose of the Study:

    • To develop and demonstrate a novel optical vector network analyzer (OVNA) utilizing double-sideband (DSB) modulation.
    • To enhance the measurement range and accuracy of OVNA systems.
    • To enable straightforward measurement of devices with bandpass responses.

    Main Methods:

    • Implementation of an OVNA based on double-sideband (DSB) modulation employing a dual-parallel Mach-Zehnder modulator.

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  • Performing dual measurements of the device under test (DUT) with distinct modulation schemes.
  • Utilizing post-processing techniques to accurately determine the DUT's response.

    • Main Results:

    • The proposed DSB modulation scheme effectively doubles the measurement range compared to traditional SSB-based OVNA.
    • Elimination of even-order sidebands significantly improves measurement accuracy.
    • Successful and accurate measurement of a DUT with a bandpass response, a feat challenging for SSB methods.

    Conclusions:

    • The developed DSB modulation-based OVNA provides superior performance in terms of measurement range and accuracy.
    • The method simplifies the measurement of bandpass devices, overcoming a key limitation of prior techniques.
    • The theoretical and experimental validation confirms the robustness and effectiveness of the proposed OVNA scheme.