Dual-Heterodyne Mixing Based Phase Noise Cancellation for Long Distance Dual-Wavelength FMCW Lidar

Pu, Minglong; Xie, Weilin; Zhang, Ling; Feng, Yuxiang; Meng, Yinxia; Yang, Jun; Zhou, Haijun; Bai, Yuanshuo; Wang, Tao; Liu, Songhan; Ren, Yanfei; Wei, Wei; Dong, Yi

doi:10.1364/ofc.2020.th1k.2

Cited by 1 publication

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Combined with the chirp rate of the LFM RF signal, the distance information can be obtained. The measured distance D is D = c τ / ( 2 n ) = c f b / ( 2 n γ ) γ = 2 B̅ / T where c is the speed of light, n is the refractive index of the SMF, f b is the frequency of the detected electrical signal, γ is the chirp rate of the LFM beat signal, B̅ and T are the modulation bandwidth and period of the LFM beat signal, and τ = f b /γ is the relative delay time between the reference and the probe beams.…”

Section: Applications In Distance Measurementmentioning

confidence: 99%

Monolithic Integrated Linear Frequency Modulated Dual-Wavelength DFB Laser Chip with High Linearity and Its Application in Long Distance Ranging

Zhang

Shi

et al. 2023

ACS Photonics

View full text Add to dashboard Cite

The ranging distance and precision of the coherent frequency modulated continuous wave (FMCW) lidar systems are mainly limited by the modulation linearity and the intrinsic line width of the laser sources. To this issue, we design and experimentally demonstrate a monolithic integrated linear frequency modulated (LFM) dual-wavelength (DW) DFB laser with high frequency sweep linearity and without a complicated predistortion compensation system. Our results show that the nonlinearity of the LFM beat signal from the DW-DFB laser chip can reach 0.0146%. Furthermore, using the LFM DW-DFB laser, we implement an accurate measurement of a single mode fiber (SMF) with a length of 12.6 km, which is hundreds of times the intrinsic coherent length of the DW-DFB laser. Due to the high linearity of the LFM DW-DFB laser, the measurement error does not deteriorate significantly when the target distance increases from 0.43 to 24.24 m.

show abstract