Optical Frequency Comb Frequency-division Multiplexing Dispersive Interference Multichannel Distance Measurement
Liang Xu, Tengfei Wu, Jiarui Lin, Linghui Yang, Jigui Zhu
Abstract
Abstract An optical frequency comb (OFC) frequency-division multiplexing dispersive interference multichannel distance measurement method is proposed. Based on the OFC dispersive interference, the wide OFC spectrum is divided into multiple channels using a wavelength-division multiplexer. Under the existing light source and spectrometer, a single interference system can realize six channels of the high-precision parallel absolute distance measurement. The influence of the spectrum width and shape on the performance of the distance measurement channel is analyzed. The ranging accuracy of six channels is higher than ± 4 μm under the optimization of a nonuniform discrete Fourier transform and Hanning window.