The experimental setup of 113 km absolute ranging with nanometer precision (IMAGE)

Science China Press

The experimental setup of 113 km absolute ranging with nanometer precision

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(top) Overview of the 113-km experimental path for BDCR. (bottom) The primary apparatus at two experimental sites. The OFCs at the two terminals of the same wavelength have a slight frequency difference, forming a set of equipment for BDCR. The performance of the BDCR method is evaluated by comparing the results of two independent ranging devices at different wavelengths. USL, ultra-stable laser; HP OFC, high-power optical frequency comb; WDM, wavelength-division multiplexer; GPS, global positioning system; ADC, analog-to-digital converter; Rb FS, rubidium frequency standard.

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