Phase locking of 270-440 GHz Josephson flux flow oscillators

Jesper Mygind, V.P. Koshelets, S.V. Shitov, L.V. Filippenko, V.L. Vaks, A.B. Baryshev, W. Luinge, N. Whyborn

Research output: Contribution to journalJournal articleResearchpeer-review


External phase locking of a Josephson flux flow oscillator (FFO) to a 10 MHz reference oscillator is demonstrated experimentally in the frequency range 270-440 GHz. A linewidth as low as 1 Hz (as determined by the resolution bandwidth of the spectrum analyser) has been measured. This linewidth is far below the fundamental level given by shot and thermal noise of the free-running tunnel junction. The combination of narrow linewidth, wide band tunability and low noise is important for spectral radio astronomy applications.
Original languageEnglish
JournalSuperconductor Science & Technology
Issue number11
Pages (from-to)720-722
Publication statusPublished - 1999


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