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Publication Detail
Frequency-Modulated Chirp Signals for Single-Photodiode Based Coherent LiDAR System
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Yi W, Li Z, Zhou Z, Sillekens E, Gerard T, Deakin C, Ferreira FM, Galdino L, Liu Z, Bayvel P, Killey RI
  • Publication date:
  • Pagination:
    4661, 4670
  • Journal:
    Journal of Lightwave Technology
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
In this paper, we investigate two categories of linear frequency-modulated chirp signals suitable for single-photodiode based coherent light detection and ranging (LiDAR) systems, namely, the frequency-modulated continuous-wave (FMCW) single-sideband (SSB) signal and the amplitude-modulated double-sideband (DSB) signal, and compare their achievable receiver sensitivity performance. The DSB signal requires a simpler transmitter design, as it is real-valued and can be generated using a single-drive Mach-Zehnder modulator (MZM), while the SSB signal, which is frequency/phase modulated, requires an in-phase and quadrature modulator (IQM)-based transmitter. A theoretical analysis of direct-detection (DD) beating interference (BI) especially the local oscillator (LO) beating with itself, known as LO-LO BI, is presented. Both Monte Carlo simulations and experimental demonstrations are carried out. Good agreement between simulations and experiments is achieved. In comparison with the SSB system, the DSB signal-based system is affected by laser phase noise-induced power fluctuation, and also suffers a significant sensitivity penalty due to nonlinear LO-LO BI. A spectral guard band for mitigating LO-LO BI is necessary for the DSB signal, achieved at the expense of requiring a larger electrical bandwidth. In system tests with a delay line of 385 m, the SSB signal outperforms the DSB signal with a 10 dB better receiver sensitivity in the case with a guard band, and 25 dB better sensitivity without a guard band.
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