Abstract
Spectrum of oscillations in the dynamic state of long Josephson junction (JJ) in parallel magnetic field is studied analytically and numerically. In the flux-flow state, interaction of the moving fluxon train with the edges of the JJ results in resonant generation of an acoustic fluxon density wave. A new type of resonance occurs at higher voltages, above the flux-flow branch. Here the spectrum consists of two correlated frequencies. Resonant mixing with the fundamental Josephson frequency results in large amplitude of oscillations. Possible applications of such resonant mixing as a frequency multiplier and adjustable narrow line-width generator are discussed.
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