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Frequency-modulated Chirp Signals for Single-photodiode Based Coherent LiDAR System

Yi, W; Li, Z; Zhou, Z; Sillekens, E; Gerard, T; Deakin, C; Ferreira, FM; ... Killey, RI; + view all (2021) Frequency-modulated Chirp Signals for Single-photodiode Based Coherent LiDAR System. Journal of Lightwave Technology p. 1. 10.1109/jlt.2021.3081255. (In press). Green open access

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Abstract

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.

Type: Article
Title: Frequency-modulated Chirp Signals for Single-photodiode Based Coherent LiDAR System
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/jlt.2021.3081255
Publisher version: https://doi.org/10.1109/JLT.2021.3081255
Language: English
Additional information: © 2021 IEEE. Published under a Creative Commons License (https://creativecommons.org/licenses/by/4.0/).
Keywords: Coherent detection, frequency-modulated continuous-wave, light detection and ranging
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10128752
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