Stability of the Oscillation Mode in a Multiple-Oscillator System

By using the Rieke diagram in terms of traveling waves, we discuss the stability conditions for an oscillation mode in a multiple-oscillator system which clearly indicate the reason why it is difficult for a multiple-oscillator system to obtain a single-mode operation. Further, we proposed a combining power system of oscillators which can give a stable operation free from the moding problem. Experimental observations are found to be in good agreement with the conclusions of the analytical approach.