Fischer, U.H.P.U.H.P.FischerHelmolt, C. vonC. vonHelmolt2022-03-032022-03-031994https://publica.fraunhofer.de/handle/publica/18554210.1109/68.3348472-s2.0-0028548817An optical reference unit at 1547.825 nm was built in a rack-mounted engineered design. A frequency stability of better than 10-9 (100 kHz) was reached.enkryptonlaser frequency stabilitymeasurement standardsoptical fibre communicationwavelength division multiplexingrack-mountedoptical reference unit1547.825 nm621535journal article