Abstract
The modulated harmonic wave in the discrete series‐connected Josephson transmission line (JTL) is considered. The approach to the modulation problems for discrete wave equations based on discrete calculus is formulated. The approach is checked by applying it to the Fermi–Pasta–Ulam–Tsingou (FPUT) ‐type problem. Applying the approach to the discrete JTL, the equation describing the modulation amplitude is obtained, which turns out to be the defocusing nonlinear Schrödinger (NLS) equation. The profile of the single soliton solution of the NLS is compared with that of the soliton obtained in the previous publication.
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