In a four-wave-mixing Josephson TWPA, gain compression comes from both pump depletion and power-induced phase mismatch, with the latter becoming important near the edges of the amplification band.
This allows calibrating the system gain of output line A and the base reflection of out- put line B
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Gain compression in Josephson Traveling-Wave Parametric Amplifiers
In a four-wave-mixing Josephson TWPA, gain compression comes from both pump depletion and power-induced phase mismatch, with the latter becoming important near the edges of the amplification band.