Abstract
Spectral characteristics of THz generation in a parallel array of inductively coupled Josephson junctions with intermediate-to-large damping in the presence of thermal noise have been studied numerically. The influence of the number of junctions and coupling between them on the spectral linewidth has been investigated. We show that known theoretical formulas for radiation linewidth of a single Josephson junction, divided by the number of junctions in the chain, gives good agreement with numerical results for overdamped chains, while for chains with intermediate damping a factor of 1/2 has to be introduced into the formula in order to describe the linewidth on the I-V curve steps corresponding to lag-synchronization (soliton) regimes.
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