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Updated: May 28, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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On-chip bidirectional optical frequency shifter for optical frequency transfer.

Ziang Qiu, Zijie Zhou, Hanzhao Zhong

    Optics Letters
    |February 14, 2025
    PubMed
    Summary
    This summary is machine-generated.

    We developed an on-chip bidirectional frequency shifting device (BFSD) for optical frequency transfer (OFT) systems. This device achieves high efficiency and suppression, enabling chip-based OFT networks.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Quantum Metrology

    Background:

    • Optical frequency transfer (OFT) is crucial for high-precision timing and sensing.
    • Existing OFT systems often rely on bulky and complex components.
    • The development of miniaturized, on-chip solutions is highly desirable.

    Purpose of the Study:

    • To realize an on-chip bidirectional frequency shifting device (BFSD).
    • To demonstrate its application in optical frequency transfer (OFT) systems.
    • To enable the construction of chip-based OFT networks.

    Main Methods:

    • Fabrication of a BFSD using a thin-film lithium niobate on insulator (LNOI) platform.
    • Utilizing two cascaded traveling wave phase modulators (PMs).
    • Applying serrodyne modulation for bidirectional frequency shifting.

    Main Results:

    • Achieved a frequency shifting efficiency exceeding 98.8%.
    • Demonstrated carrier suppression (CSR) of 42 dB and sideband suppression ratio (SSR) of 31 dB.
    • Verified the theoretical phase noise suppression capability in a BFSD-based OFT system.

    Conclusions:

    • The developed BFSD is suitable for OFT applications.
    • The LNOI platform enables efficient and compact device fabrication.
    • This technology paves the way for chip-based optical frequency transfer networks.