3-D Multi-Input Multi-Output (MIMO) Pulsed Chaos Lidar Based on Time-Division Multiplexing

Abstract

In this study, we propose and evaluate a 3D multi-input multi-output (MIMO) pulsed chaos lidar based on time-division multiplexing. By time-gating a chaos waveform sequentially at different times, chaos-modulated pulses for different channels that are uncorrelated with each other can be generated. To quantitatively evaluate the anti-interference/jamming capability, we investigated the detection performance of the MIMO chaos lidar under different jamming strengths and overlapped ratios between the jamming and the signal pulses. The overall detection probabilities of the chaos lidar and a conventional time-digital-converter-based pulsed lidar under the influence of interference/jamming were compared and we found that the chaos lidar exhibits strong resistance to the interference/jamming. Employing the 3D MIMO chaos lidar developed, we demonstrate 3D imaging under the influence of interference/jamming. By simultaneously scanning 2 different channels with overlapped field-of-views (FOVs), 3D images with large-FOV/low-resolution and small-FOV/high-resolution were obtained at the same time.

Parallel random LiDAR with spatial multiplexing of a many-mode laser

“…Our scheme has advantages over other demultiplexing schemes of chaotic signals in radio-frequency [46], optical frequency [8,47,48], polarization [49,50], and time domain [9,51]. Time-division demultiplexing inevitably requires a longer acquisition time for more channels, while for spatial demultiplexing the number of channels is independent of acquisition time.…”

“…Parallel LiDAR based on multiple-input multipleoutput (MIMO) scheme [5] facilitates high-speed 3D mapping. To generate multiple probe beams in parallel, spectral and/or temporal multiplexing of broadband light sources [6][7][8][9][10] are employed. With total bandwidth fixed, a larger number of spectral channels is accompanied by a narrower bandwidth of each channel, which means a worse resolution.…”

Recent Advances in Light Detection and Ranging: Optical Modulation Solutions and Novel Nanotechnologies

“…Nonlinear dynamics in semiconductor lasers, achieved through optical injection and feedback, can generate optical chaos, eliminating the need for costly high-speed signal generators or external modulators. [43][44][45][46][47][48][49][50] Although the viability of continuous wave (CW) chaos LiDAR was demonstrated in 2004, it experienced a low SNR and limited detection capabilities, especially when operating at reduced average output power levels to meet eye safety requirements. To enhance SNR and enable practical applications of chaos LiDAR systems using pulsed mode, researchers have devised designs that produce chaos-modulated pulses through gain switching and time gating.…”

Suppression of time-delayed signature in chaotic signals based on optoelectronic hybrid feedbacks

“…Nevertheless, a CFBG with a grating dispersion coefficient of 2000 ps/nm is not easy to fabricate. In addition, the distributed feedback laser exhibits obvious relaxation oscillation phenomena, which corresponds to an unflatten spectrum [22][23]. As comparison, broadband optoelectronic oscillators (OEOs) based on the microwave photonic technology are powerful candidates to generate complex chaotic signals without the relaxation oscillation effect [24][25].…”