Performance and uses of the Refimeve metrological signal, 1000 km from the source

Abstract : We present a detailed analysis of the end-user performance of the metrological signal at 1542 nm disseminated by the French national fiber network Refimeve, about 1000 km from the source. By means of a local ultrastable laser at 729 nm and an optical frequency comb, we are able to carry out instability and phase noise measurements of the signal with respect to the local laser. With a focus on phase noise analysis, we identify different timescales of interest for the use of this signal in optical frequency metrology. First, we identify a flicker frequency noise plateau at 2×10^-15 on the local laser between 1 and 12 s. We then deduce from our measurement that the linewidth of the receivedRefimeve laser is 6.2 kHz for an averaging time higher than 40 ms.

[Vol. 42, No. 11 / November 2025 / Journal of the Optical Society of America B]

M. Collombon, E. Cantin, G. Hagel, P.-E. Pottie, M. Houssin and C. Champenois

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