On the basis of the input-output intensity relationship of the signal, this paper will evaluate and discuss the role of the position of the signal going into the Nonlinear Michelson Interferometer (NMI) and its influence on the bistable characteristics. From that results, the position of signal going into the NMI will be chosen, so that the interferometer acts as an optical bistability device. | Influence of the position of input signal on the bistability characteristic of nonlinear michelson interferometer