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Related Concept Videos

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

165
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
165

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Multi-octave linearized RF/photonic link based on orthogonal modulation and optimized demodulation.

Yiran Gao, Zhonghan Wu, Jingyue Chen

    Optics Letters
    |November 15, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel linearized analog radio-frequency (RF)/photonic link using a DC-reserved (DCR) digital method. The DCR approach enhances signal quality and tolerance to errors, proving effective for broadband applications.

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    Area of Science:

    • Photonics
    • Radio-Frequency Engineering
    • Signal Processing

    Background:

    • Analog RF/photonic links are crucial for high-frequency signal transmission.
    • Linearity and dynamic range are key performance metrics, often limited by component imperfections and processing errors.
    • Existing digital signal processing methods struggle with amplitude and DC errors inherent in optical modulators.

    Purpose of the Study:

    • To propose and demonstrate a multi-octave linearized analog RF/photonic link.
    • To improve tolerance to in-phase/quadrature amplitude imbalance and Q-path DC error.
    • To achieve higher signal-to-distortion ratios compared to traditional methods.

    Main Methods:

    • Utilized a DC-reserved (DCR) digital method within a parallel Mach-Zehnder-modulator scheme.
    • Employed orthogonal modulation and optimized demodulation techniques.
    • Theoretically analyzed fault tolerance and transmission performance, followed by experimental verification.

    Main Results:

    • Achieved high spurious-free dynamic ranges (SFDR2): 103.74 dB·Hz1/2 and (SFDR3): 116.31 dB·Hz2/3.
    • Demonstrated superior signal-to-distortion ratios compared to traditional digital-signal-processing methods when considering amplitude and DC errors.
    • Verified link linearization across various RF signal frequencies.

    Conclusions:

    • The proposed DCR method significantly enhances the linearity and performance of analog RF/photonic links.
    • The system exhibits robust fault tolerance, making it suitable for demanding broadband applications.
    • This advancement holds potential for next-generation high-frequency communication and sensing systems.