https://www.nist.gov/publications/long-distance-optical-frequency-transfer-over-fiber-predicting-frequency-stability-0
We have recently demonstrated the coherent transfer of an optical signal over a 251 km link of optical fiber using the standard Doppler-cancellation approach to
long distancefrequency transferopticalfiberpredicting
https://www.nist.gov/publications/absolute-and-relative-stability-optical-frequency-reference-based-spectral-hole-burning
We present four frequency comparison measurements designed to investigate the performance of an optical frequency reference based on spectral hole burning in Eu
frequency referenceabsoluterelativestabilityoptical