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Directly modulated optical negative feedback lasers for long-range FMCW LiDAR.

Nobuhide Yokota, Hiroki Kiuchi, Hiroshi Yasaka

    Optics Express
    |April 27, 2022
    PubMed
    Summary

    Directly modulated lasers with optical negative feedback achieve low frequency noise for high signal-to-noise ratio (SNR) in frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR). This enables long-range FMCW LiDAR applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Laser Technology
    • Sensing and Measurement

    Background:

    • Frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) requires lasers with stable frequency sweeps for high signal-to-noise ratio (SNR).
    • Directly modulated lasers offer a compact solution but often suffer from high frequency (FM) noise, limiting their range performance.

    Purpose of the Study:

    • To investigate the frequency sweep operation of directly modulated optical negative feedback lasers.
    • To enhance the SNR and enable long-range capabilities for FMCW LiDAR systems.

    Main Methods:

    • Numerical and experimental investigation of frequency sweep operation in directly modulated optical negative feedback lasers.
    • Utilizing optical feedback from a Fabry-Perot etalon to suppress FM noise and reduce spectral linewidth.

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  • Testing with a 300-m delay fiber as a ranging sample to evaluate performance.

    • Main Results:

    • Achieved sustained low FM noise with a spectral linewidth of approximately 2.0 kHz.
    • Demonstrated a beat note spectrum with a high 30-dB SNR, even with a 300-m delay fiber.
    • Confirmed the effectiveness of optical negative feedback in improving laser performance for FMCW LiDAR.

    Conclusions:

    • Directly modulated optical negative feedback lasers are a promising technology for high-SNR, long-range FMCW LiDAR.
    • The proposed method effectively suppresses FM noise, paving the way for practical long-range LiDAR applications.