Frequency-Modulated Continuous-Wave Laser Source Based on Four-Wave Mixing Process in a Silicon Integrated Waveguide Doped With Reverse-Biased P-i-N Junction

• DOI: 10.1109/jlt.2024.3433012
• Publication Date: 2024-07-24T18:34:55Z
• Authors: Kunpeng Zhai; Xinyan Zhang; Renheng Zhang; Sha Zhu; Heng Zhou; Guangming Zhao; Yu Liu; Pengfei Xu; Huashun Wen; Ninghua Zhu
• Keywords: Waveguide; Four-wave mixing; Continuous wave; Integrated Optics

We propose and demonstrate a Frequency Modulated Continuous Wave (FMCW) laser source realized through sideband modulation four-wave mixing (FWM). A silicon waveguide, featuring reverse-biased P-i-N junction, is designed to excite FWM process. With the increase of applied bias voltage, efficiency effect in waveguide improved due more effective removal free-carriers. The integrated enables high conversion −12 dB. In experiment, radio frequency (RF) signal swept over range 9 GHz 11 GHz. was modulated by Mach-Zehnder modulator generate first-order sideband. Meanwhile, process expand threefold sweeping span 6 GHz, thereby enhancing spatial resolution 2.5 cm. original tuning 2 rate 0.2 GHz/s multiplied 3 times 0.6 GHz/μs respectively. results show that FMCW has wider bandwidth linearity 11.5×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup> , fast chirp GHz/μs. frequency-modulated light exhibits excellent linearity, low noise, narrow linewidth, rates, which are critical attributes for modern electrical systems such as detection ranging (LiDAR) system. Additionally, system obviates need intricate linearization algorithms, offering advantages simplicity structure, precision easy integrate.