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Updated: Jul 26, 2025

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Simple polarization-insensitive coherent RoF link with increased capacity.

Long Huang, Zhenguo Lu, Ke Wu

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    This study presents a simplified polarization-insensitive coherent radio-over-fiber link. It enhances spectrum efficiency and transmission capacity using a novel digital signal processing algorithm.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Signal Processing

    Background:

    • Conventional polarization-diversity coherent receivers (PDCRs) are complex, requiring multiple polarization splitters, hybrids, and photodetectors.
    • Achieving polarization-insensitive detection and demultiplexing of spectrally overlapping signals in radio-over-fiber (RoF) links presents significant challenges.

    Purpose of the Study:

    • To propose and demonstrate a simplified, polarization-insensitive coherent RoF link with enhanced spectrum efficiency and transmission capacity.
    • To introduce a novel digital signal processing (DSP) algorithm for polarization-insensitive detection and joint phase noise elimination.

    Main Methods:

    • A simplified PDCR utilizing one polarization splitter (PBS), one optical coupler (OC), and two photodetectors (PDs) was employed.
    • A novel DSP algorithm was developed to achieve polarization-insensitive detection and demultiplexing of two spectrally overlapping microwave vector signals.
    • The algorithm also addresses the elimination of joint phase noise from transmitter and local oscillator (LO) laser sources.

    Main Results:

    • The successful transmission and detection of two independent 16-quadrature amplitude modulation (16QAM) microwave vector signals at 3 GHz with a 0.5 GSym/s symbol rate over a 25-km single-mode fiber (SMF) was demonstrated.
    • The simplified receiver architecture significantly reduces component count compared to conventional PDCRs.
    • The spectrum superposition of the microwave vector signals led to increased spectral efficiency and data transmission capacity.

    Conclusions:

    • The proposed simplified coherent RoF link with a novel DSP algorithm offers a cost-effective and efficient solution for high-capacity optical communication systems.
    • This approach effectively overcomes the limitations of conventional PDCRs, enabling polarization-insensitive operation and improved spectral efficiency.
    • The demonstrated system paves the way for enhanced performance in future radio-over-fiber applications.