... Detector response for the case of high fluctuation level has been considered as well. ... Analytical Theory Approach The analytical consideration of Josephson junction dynamics is performed using the following master equation: (2) sin q sin 2 i a sin ( t ) if , where the bias current i and fluctuation current if are normalized by critical current Ic , and factor q describes the second harmonic contribution The term ( sin sin 2 ) is a small parameter in the extreme ...